High-frequency amplitude-phase equalization device and method for dual-drive four-resonance cyclotron

Abstract

The invention provides a high-frequency amplitude-phase equalization device and method for a dual-drive four-resonance cyclotron, and the device comprises a first vector modulator and a second vector modulator which are used for providing incident drive power signals for a first high-frequency power source and a second high-frequency power source respectively. The DSP control board is used for respectively controlling the amplitude and the phase of incident driving power signals output by the first vector modulator and the second vector modulator, and the data collector is respectively connected with the first vector modulator, the second vector modulator, the first high-frequency power source, the second high-frequency power source and the DSP control board. The method comprises the steps that a DSP control panel carries out PID error operation based on target amplitude information x1n 'and x2n', phase difference information and actual amplitude and phase information x1 and x2, control over the amplitude and phase of incident driving power signals output by a first vector modulator and a second vector modulator is achieved, and it is guaranteed that the amplitude and phase signals of two paths of high-frequency power sources are consistent. The invention provides an amplitude-phase equalization method based on a lookup table, which ensures the amplitude-phase equalization of the output power of two high-frequency power sources.

Description

Technical Field

[0001] The invention relates to a high-frequency control technology of a medical superconducting cyclotron, and in particular to a high-frequency amplitude-phase balancing device and method for a dual-drive four-resonance cyclotron. Background Art

[0002] The high-frequency power source is one of the important components of the high-frequency system of the cyclotron. The high-frequency power generated by the high-frequency power source is fed into the high-frequency cavity to excite the high-frequency acceleration electric field in the high-frequency cavity. The particles cyclotron in the cyclotron and gain energy and are accelerated when passing through the acceleration gap of the high-frequency cavity. The dual-power source driven four-resonance cavity cyclotron is divided into two groups of cavities, I and R. Each group contains two dual-acceleration gap resonant high-frequency cavities that are hard-connected with conductors in the central area of ​​the cyclotron. A power coupling device is provided at the tail of each group of cavities, and the two groups of high-frequency cavities are driven by two high-frequency power sources. A high-frequency signal is output through a low-level system, and is divided into two independent high-frequency signals through a 2-way power splitter to drive the two high-frequency power sources. The amplitude and phase consistency of the two-way high-frequency driving power are the unique indicators of the dual-power source driven four-resonance cavity cyclotron. Mismatch will affect the power feeding of the two groups of high-frequency cavities.

[0003] The vacuum electron tetrode used in the high-frequency power source has a saturation region and a linear region: the linear region has good linearity but low efficiency; the saturation region has poor linearity but high efficiency. In order to ensure the operating efficiency of the accelerator, the working point of the vacuum electron tetrode is usually selected to be close to the saturation region, which leads to weak input-output linearity of the high-frequency power source.

[0004] Due to the nonlinear characteristics of the high-frequency power source, the gain and phase shift characteristics of the two high-frequency power sources (using two high-frequency power sources to drive four high-frequency cavities) are not exactly the same even when they work in the linear region of the vacuum electron tetrode. This results in the amplitude and phase of the two sets of high-frequency cavity driving signals being unable to remain consistent at all times. Figure 3As shown. At present, in response to this situation, on the one hand, the attenuation of the input signals of the two power sources is adjusted by manually adjusting the attenuation of the two power sources to change the amplitude of the output power of the high-frequency power source. This can only ensure the balance of the output power of the two high-frequency power sources after the high-frequency system enters the high-power normal operation stage. Before the low-power startup and the high-frequency power is increased to normal operation, the gain characteristics of the two power sources are still inconsistent compared to the high power, and the amplitude consistency of the two power sources cannot be guaranteed. If the attenuation potentiometer knob is readjusted, manual adjustment is required every time the input power is changed, which is relatively time-consuming and laborious; if only the output power balance at high power is used as the standard, the output drive power signals of the two power sources will be inconsistent before reaching high power, affecting the power feeding of the two groups of high-frequency cavities. On the other hand, the phase is adjusted by manually adjusting the phase potentiometer knobs of the two power sources. Every time the gain of the two high-frequency power sources changes, the knob needs to be adjusted, which is relatively time-consuming. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention proposes a high-frequency amplitude-phase equalization device and method for a dual-drive four-resonance cyclotron accelerator. The first purpose is to solve the problem that the output signal amplitude and phase are difficult to match due to the different gain and phase shift characteristics of the two power sources; the second purpose is to solve the problem that the method of manually adjusting the attenuation potentiometer knobs of the two power sources is not only time-consuming and labor-intensive, but also that the amplitude consistency of the two power sources cannot be guaranteed by manual knobs before low-power startup and high-frequency power is increased to normal operation.

[0006] The present invention proposes the following technical solutions to solve the technical problems:

[0007] A high-frequency amplitude-phase equalization device for a dual-drive quad-resonance cyclotron includes a No. 1 vector modulator and a No. 2 vector modulator for providing incident driving power signals to a No. 1 high-frequency power source and a No. 2 high-frequency power source, respectively, and a DSP control board for controlling the amplitude and phase of the incident driving power signals output by the No. 1 vector modulator and the No. 2 vector modulator, respectively.

[0008] The feature is that it also includes a data collector connected to No. 1 vector modulator, No. 2 vector modulator, No. 1 high frequency power source, No. 2 high frequency power source and DSP control board respectively;

[0009] The data collector provides the DSP control board with target amplitude information x of the incident driving power signal of high frequency power sources No. 1 and No. 2 at all times. 1n ',x 2n' and the phase difference information of the output power signals of high-frequency power sources No. 1 and No. 2, as well as the actual amplitude and phase information x1, x2 of the incident driving power signals of high-frequency power sources No. 1 and No. 2 at each moment; the DSP control board is based on the target amplitude information x1 at all moments provided by the data collector 1n ',x 2n ', the phase difference information at all times, the actual amplitude and phase information x1, x2 of the incident driving power signals of the two high-frequency power sources at each moment, and the target amplitude information, phase difference information and actual amplitude and phase information at each moment are subjected to PID error calculation to realize the control of the amplitude and phase of the incident driving power signals output by vector modulators No. 1 and No. 2 at each moment, so as to ensure that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment; the target amplitude information x 1n ',x 2n ' is the input-output amplitude lookup table information at all moments based on reverse compensation; the said all moments are all moments when the data collector is in working state.

[0010] Furthermore, the data collector comprises:

[0011] The following are arranged in sequence at the output end of the No. 1 vector modulator: the No. 1 front power divider and the No. 1 front directional coupler; the following are arranged at the output end of the No. 1 high-frequency power source: the No. 1 rear directional coupler and the No. 1 rear power divider;

[0012] The following are arranged in sequence at the output end of the No. 2 vector modulator: the No. 2 front power divider and the No. 2 front directional coupler; the following are arranged at the output end of the No. 2 high frequency power source: the No. 2 rear directional coupler and the No. 2 rear power divider;

[0013] A phase detector is used to receive the phases of the two-way high-frequency power source output power signals collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler, and then equally divided by the No. 1 rear power divider and the No. 2 rear power divider, and make a difference, and send the phase difference signal to the USB module;

[0014] 4-way detectors, used for receiving incident driving power signals x1, x2 outputted by the two-way vector modulators at each moment after being equally divided by the No. 1 front power divider and the No. 2 front power divider after the incident driving power signals outputted by the two-way vector modulators are collected by the No. 1 front directional coupler and the No. 2 front directional coupler; and receiving output power signals y1, y2 of the two-way high-frequency power sources at each moment after being equally divided by the No. 1 rear power divider and the No. 2 rear power divider after the output power signals of the two-way high-frequency power sources are collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler, and sending the 4-way signals to the USB module;

[0015] The USB module has an input end connected to 4-way detectors and phase detectors, and an output end connected to the DSP control board; it is used to send the incident driving power signals x1, x2 of the two channels at each moment, the output power signals y1, y2 of the two channels at each moment, and the phase difference signals of the output power signals of the two high-frequency power sources at each moment to the host computer;

[0016] The host computer is used to receive the incident driving power signals x1, x2 of the two high-frequency power sources at each moment, the output power signals y1, y2 of the two sources at each moment, and the phase difference of the output power signals of the two sources at each moment read by the USB module, record and process the data to form an input-output amplitude lookup table at all moments based on reverse compensation, and store the lookup table and the phase difference in the DSP control board;

[0017] The No. 1 front directional coupler and the No. 2 front directional coupler respectively collect the incident driving power signals x1 and x2 outputted by the No. 1 vector modulator and the No. 2 vector modulator at each moment;

[0018] The No. 1 front power divider and the No. 2 front power divider divide the incident driving power signals x1 and x2 collected by the No. 1 front directional coupler and the No. 2 front directional coupler into two paths respectively, one of which outputs the incident driving power signals x1 and x2 at each moment after the division to the DSP control board for the DSP control board to read the amplitude and phase, and the other outputs the incident driving power signals x1 and x2 at each moment after the division to the detector for reading the amplitude;

[0019] The No. 1 rear directional coupler and the No. 2 rear directional coupler respectively collect the output power signals y1 and y2 at each moment outputted by the No. 1 high-frequency power source and the No. 2 high-frequency power source to the I cavity and the R cavity of the high-frequency resonant cavity;

[0020] The No. 1 rear power divider and the No. 2 rear power divider divide the respective output power signals collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler at each moment into two paths, one of which outputs the respective output power signals y1, y2 at each moment after the equalization to the phase detector for reading the phase and making a difference, and the other outputs the respective output power signals y1, y2 at each moment after the equalization to the detector for reading the amplitude.

[0021] A high-frequency amplitude-phase equalization method for a dual-drive quad-resonance cyclotron accelerator is characterized by comprising the following steps:

[0022] Step 1: The USB module reads the incident driving power signals x1, x2 and the output power signals y1, y2 of the two high-frequency power sources at each moment after detection by the 4-way detectors, and sends them to the host computer. The host computer forms an input-output amplitude lookup table at all moments based on reverse compensation and stores it in the DSP control board; the input-output amplitude lookup table at all moments based on reverse compensation is a plurality of groups of output power signals y1, y2 at all moments. n And the input power signal x at all times 1n ',x 2n 'relationship table, n is the number of rows; x1, x2 contain the amplitude and phase information of the incident driving power signal of the two high-frequency power sources at each moment, y1, y2 contain the amplitude and phase information of the output power signal of the two high-frequency power sources at each moment, x 1n ',x 2n 'Contains the target amplitude information of the incident driving power signals of the two high-frequency power sources at all times;

[0023] Step 2: The USB module reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources in the phase detector at each moment, and records and stores the phase difference information at all moments in the DSP control board;

[0024] Step 3: The DSP control board reads the incident driving power signals x1 and x2 of the two high-frequency power sources fed back by the front power distributors No. 1 and No. 2 at each moment; x1 and x2 contain the actual amplitude and phase information of the incident driving power signals of the two high-frequency power sources at each moment;

[0025] Step 4: In the DSP control board, based on the target amplitude information x at all times stored in step 1 1n ',x 2n ' and the phase difference information at all moments stored in step 2, set the target reference value of the incident drive power signal amplitude and phase at each moment, read the actual amplitude and phase information x1, x2 of the incident drive power signals of the two high-frequency power sources at each moment according to step 3, perform PID error calculation, and realize the control of the amplitude and phase of the incident drive power signals output by vector modulators No. 1 and No. 2 at each moment, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment.

[0026] The formation of the input-output amplitude lookup table at all times based on reverse compensation in step 1 includes the following process:

[0027] 1) The data collector uses the front and rear directional couplers of high-frequency power sources 1 and 2 to extract and record the incident driving power signal x of the high-frequency power source at all times 1n 、x 2nAnd the output power signal y 1n ,y 2n , after being equally divided by the front and rear power distributors of the No. 1 and No. 2 high-frequency power sources and detected by the detector, the input and output signal amplitude values ​​are read through the USB module and recorded in the host computer;

[0028] 2) The host computer directly performs cubic spline interpolation on the data acquired at all times to obtain the input-output characteristic formulas y1=f(x1) and y2=f(x2) of the interpolation points at each time;

[0029] 3) Let y1 = y2 = y, and reversely get x1′, x2′, forming the output power signal y at all times n and the input power signal x 1n ',x 2n 'Amplitude lookup table: To ensure that the output powers y1 and y2 of the two high-frequency power sources reach the same output power y at each moment, the output power of the high-frequency power source at each moment is

[0030] As the independent variable, the host computer inverts the input-output characteristic formula of the two high-frequency power sources to obtain x1=f -1 (y) and x2 = f -1 (y), obtain the input-output amplitude lookup table of what the input powers x1′ and x2′ of the power sources should be at each moment when the two high-frequency power sources reach the same output power y, set the incident driving powers x1′ and x2′ of the power sources at each moment as the target reference values ​​and store them in the DSP control board for subsequent PID processing.

[0031] Furthermore, the USB module in step 2 reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources at each moment, that is, the data collector uses the rear directional couplers of high-frequency power sources No. 1 and 2 to extract the output power signals y1 and y2 of the high-frequency power sources at each moment, and after being equally divided by the rear power dividers of high-frequency power sources No. 1 and 2, the phase information of the output power signals y1 and y2 at each moment is read in the phase detector and the difference is made, and the phase difference of the output power signals at all moments is read through the USB module and recorded in the host computer.

[0032] Furthermore, the DSP control board of step three reads the incident driving power signals x1 and x2 of the two high-frequency power sources at each moment, that is, the data collector uses the front directional couplers of high-frequency power sources No. 1 and 2 to extract the incident driving power signals x1 and x2 of the high-frequency power sources at each moment, and after being equally divided by the front power dividers of high-frequency power sources No. 1 and 2, the incident driving power signals x1 and x2 of the high-frequency power sources at each moment are fed back to the DSP control board as actual measured values ​​for subsequent PID processing.

[0033] Furthermore, the control of the amplitude and phase of the incident driving power signal output by vector modulators No. 1 and No. 2 at each moment in step 4 is specifically as follows:

[0034] 1) Obtain the target amplitude reference value x1′, x2′ and the target reference value of the phase of the incident driving power signal stored in the DSP control board at each moment;

[0035] 2) Use the target amplitude reference value x1′, x2′, target phase reference value and actual measured value x1, x2 at each moment to perform PID error calculation to ensure that the amplitude and phase of the incident drive power signal output by vector modulators No. 1 and 2 at each moment tend to the target reference value.

[0036] Furthermore, the process 2) of step 4 is as follows:

[0037] The DSP control board controls the size of the mutually orthogonal RF I1, Q1, I2, Q2 components of vector modulators No. 1 and No. 2 at each moment according to the difference between the target amplitude reference value x1′, x2′, the target phase reference value and the actual measured value x1, x2 at each moment: the amplitude and phase control of the incident drive power signal x1, x2 output by vector modulators No. 1 and No. 2 at each moment is completed by synthesizing the I component and the Q component in phase. Assuming that the adjusted control voltage of the I component at each moment is Vi and the adjusted control voltage of the Q component is Vq, the amplitude RFout and phase RFout-in of the output signal x1, x2 of vector modulators No. 1 and No. 2 at each moment are:

[0038]

[0039] Advantages and effects of the present invention

[0040] 1. Aiming at the problem that the high-frequency system in the field of dual high-frequency power sources driving four-resonance cavity cyclotron accelerator has long been difficult to match the output power amplitudes of two high-frequency power sources at low power and the two-way phase inconsistency due to the nonlinear characteristics of the high-frequency power sources in engineering practice, the present invention proposes an amplitude-phase balancing method based on a reverse compensation input-output amplitude lookup table. The method controls the input and output power of the high-frequency power source by adjusting the output amplitude and phase of the I and Q components of the vector modulator, thereby ensuring the amplitude-phase balance of the output power of the two high-frequency power sources.

[0041] 2. The present invention realizes the automatic amplitude and phase uniformity of the output power of two high-frequency power sources through an amplitude and phase equalization device and method based on a reverse compensation input-output amplitude lookup table, which solves the problem that the manual adjustment of the attenuation potentiometer knobs of the two power sources is not only time-consuming and labor-intensive, but also the amplitude consistency of the two power sources cannot be guaranteed by manual knobs before low-power startup and high-frequency power is increased to normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of a high-frequency amplitude and phase equalization device based on an automated dual-drive four-resonance cyclotron accelerator of the present invention;

[0043] Figure 2 This is a schematic diagram of the high-frequency amplitude and phase equalization device of the double-driven four-resonance cyclotron accelerator based on the manual knob before improvement;

[0044] Figure 3 Schematic diagram of input-output nonlinearity of the dual-drive high-frequency power source before improvement. DETAILED DESCRIPTION

[0045] Design principle of the present invention

[0046] 1. Innovation of the present invention: The innovation lies in the use of a high-frequency amplitude-phase equalization device for a dual-drive four-resonance cyclotron based on a reverse compensation input-output amplitude lookup table: the reverse compensation is to obtain a target amplitude lookup table. The target amplitude lookup table first processes the input power signals x1, x2 and output power y1, y2 signals of the two high-frequency power sources at each moment, and obtains the input power x1=f1 at each moment of the power source when the two power sources reach the same output power y. -1 (y) and x2 = f -1 (y) A lookup table of target amplitudes that should be achieved. DSP is used for pre-distortion processing to control the I and Q at each moment to adjust the amplitude and phase of the outputs of the two vector modulators at each moment, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment.

[0047] 2. Difficulty of the present invention: The difficulty lies in the fact that nonlinear characteristics exist objectively, and the problem of mismatch between the output power amplitude and phase of the two high-frequency power sources cannot be solved according to conventional thinking.

[0048] 3. The solution to the difficulties of the present invention is to adopt a reverse thinking, starting from the result, using the input-output amplitude lookup table based on reverse compensation, to deduce that when the amplitude and phase signals of the two high-frequency power sources (high-frequency power source No. 1 and high-frequency power source No. 2) are consistent at each moment, the amplitude RFout and phase RFout-in of the output signals x1 and x2 of the vector modulators No. 1 and No. 2 at each moment are:

[0049]

[0050] 4. Design principle of input-output amplitude lookup table based on reverse compensation:

[0051] Step 1: Let: y1 = f(x1) and y2 = f(x2);

[0052] Step 2: Let y1 = y2 = y, and reversely get x1′, x2′ to form the output power signal y at all times n and the input power signal x 1n ',x 2n 'Amplitude lookup table: that is, to ensure that the output powers y1 and y2 of the two high-frequency power sources reach the same output power y at every moment, let the output power y of the high-frequency power source at every moment be the independent variable, and the host computer inverts the input-output characteristic formula of the two high-frequency power sources to obtain x1=f -1 (y) and x2 = f -1 (y), obtain the input-output amplitude lookup table of what the input powers x1′ and x2′ of the power sources should be at each moment when the two high-frequency power sources reach the same output power y, set the incident driving powers x1′ and x2′ of the power sources at each moment as the target reference values ​​and store them in the DSP control board for subsequent PID processing.

[0053] Based on the above principle, the present invention designs a high-frequency amplitude-phase balancing device for a dual-drive quad-resonance cyclotron accelerator, such as Figure 1 As shown, it includes a No. 1 vector modulator and a No. 2 vector modulator for providing incident driving power signals to a No. 1 high-frequency power source and a No. 2 high-frequency power source respectively, and a DSP control board for controlling the amplitude and phase of the incident driving power signals output by the No. 1 vector modulator and the No. 2 vector modulator respectively.

[0054] The feature is that it also includes a data collector connected to No. 1 vector modulator, No. 2 vector modulator, No. 1 high frequency power source, No. 2 high frequency power source and DSP control board respectively;

[0055] The data collector provides the DSP control board with target amplitude information x of the incident driving power signal of high frequency power sources No. 1 and No. 2 at all times. 1n ',x 2n ' and the phase difference information of the output power signals of high-frequency power sources No. 1 and No. 2, as well as the actual amplitude and phase information x1, x2 of the incident driving power signals of high-frequency power sources No. 1 and No. 2 at each moment; the DSP control board is based on the target amplitude information x1 at all moments provided by the data collector 1n ',x 2n', the phase difference information at all times, the actual amplitude and phase information x1, x2 of the incident driving power signals of the two high-frequency power sources at each moment, and the target amplitude information, phase difference information and actual amplitude and phase information at each moment are subjected to PID error calculation to realize the control of the amplitude and phase of the incident driving power signals output by vector modulators No. 1 and No. 2 at each moment, so as to ensure that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment; the target amplitude information x 1n ',x 2n ' is the input-output amplitude lookup table information at all moments based on reverse compensation; the said all moments are all moments when the data collector is in working state.

[0056] Furthermore, the data collector comprises:

[0057] The following are arranged in sequence at the output end of the No. 1 vector modulator: the No. 1 front power divider and the No. 1 front directional coupler; the following are arranged at the output end of the No. 1 high-frequency power source: the No. 1 rear directional coupler and the No. 1 rear power divider;

[0058] The following are arranged in sequence at the output end of the No. 2 vector modulator: the No. 2 front power divider and the No. 2 front directional coupler; the following are arranged at the output end of the No. 2 high frequency power source: the No. 2 rear directional coupler and the No. 2 rear power divider;

[0059] A phase detector is used to receive the phases of the two-way high-frequency power source output power signals collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler, and then equally divided by the No. 1 rear power divider and the No. 2 rear power divider, and make a difference, and send the phase difference signal to the USB module;

[0060] 4-way detectors, used for receiving incident driving power signals x1, x2 outputted by the two-way vector modulators at each moment after being equally divided by the No. 1 front power divider and the No. 2 front power divider after the incident driving power signals outputted by the two-way vector modulators are collected by the No. 1 front directional coupler and the No. 2 front directional coupler; and receiving output power signals y1, y2 of the two-way high-frequency power sources at each moment after being equally divided by the No. 1 rear power divider and the No. 2 rear power divider after the output power signals of the two-way high-frequency power sources are collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler, and sending the 4-way signals to the USB module;

[0061] The USB module has an input end connected to 4-way detectors and phase detectors, and an output end connected to the DSP control board; it is used to send the incident driving power signals x1, x2 of the two channels at each moment, the output power signals y1, y2 of the two channels at each moment, and the phase difference signals of the output power signals of the two high-frequency power sources at each moment to the host computer;

[0062] The host computer is used to receive the incident driving power signals x1, x2 of the two high-frequency power sources at each moment, the output power signals y1, y2 of the two sources at each moment, and the phase difference of the output power signals of the two sources at each moment read by the USB module, record and process the data to form an input-output amplitude lookup table at all moments based on reverse compensation, and store the lookup table and the phase difference in the DSP control board;

[0063] The No. 1 front directional coupler and the No. 2 front directional coupler respectively collect the incident driving power signals x1 and x2 outputted by the No. 1 vector modulator and the No. 2 vector modulator at each moment;

[0064] The No. 1 front power divider and the No. 2 front power divider divide the incident driving power signals x1 and x2 collected by the No. 1 front directional coupler and the No. 2 front directional coupler into two paths respectively, one of which outputs the incident driving power signals x1 and x2 at each moment after the division to the DSP control board for the DSP control board to read the amplitude and phase, and the other outputs the incident driving power signals x1 and x2 at each moment after the division to the detector for reading the amplitude;

[0065] The No. 1 rear directional coupler and the No. 2 rear directional coupler respectively collect the output power signals y1 and y2 at each moment outputted by the No. 1 high-frequency power source and the No. 2 high-frequency power source to the I cavity and the R cavity of the high-frequency resonant cavity;

[0066] The No. 1 rear power divider and the No. 2 rear power divider divide the respective output power signals collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler at each moment into two paths, one of which outputs the respective output power signals y1, y2 at each moment after the equalization to the phase detector for reading the phase and making a difference, and the other outputs the respective output power signals y1, y2 at each moment after the equalization to the detector for reading the amplitude.

[0067] A high-frequency amplitude-phase balancing method for a dual-drive quad-resonance cyclotron accelerator, characterized in that it comprises the following steps:

[0068] Step 1: The USB module reads the incident driving power signals x1, x2 and the output power signals y1, y2 of the two high-frequency power sources at each moment after detection by the 4-way detectors, and sends them to the host computer. The host computer forms an input-output amplitude lookup table at all moments based on reverse compensation and stores it in the DSP control board; the input-output amplitude lookup table at all moments based on reverse compensation is a plurality of groups of output power signals y1, y2 at all moments. n And the input power signal x at all times 1n ',x2n 'relationship table, n is the number of rows; x1, x2 contain the amplitude and phase information of the incident driving power signal of the two high-frequency power sources at each moment, y1, y2 contain the amplitude and phase information of the output power signal of the two high-frequency power sources at each moment, x 1n ',x 2n 'Contains the target amplitude information of the incident driving power signals of the two high-frequency power sources at all times;

[0069] Step 2: The USB module reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources in the phase detector at each moment, and records and stores the phase difference information at all moments in the DSP control board;

[0070] Step 3: The DSP control board reads the incident driving power signals x1 and x2 of the two high-frequency power sources fed back by the front power distributors No. 1 and No. 2 at each moment; x1 and x2 contain the actual amplitude and phase information of the incident driving power signals of the two high-frequency power sources at each moment;

[0071] Step 4: In the DSP control board, based on the target amplitude information x at all times stored in step 1 1n ',x 2n ' and the phase difference information at all moments stored in step 2, set the target reference value of the incident drive power signal amplitude and phase at each moment, read the actual amplitude and phase information x1, x2 of the incident drive power signals of the two high-frequency power sources at each moment according to step 3, perform PID error calculation, and realize the control of the amplitude and phase of the incident drive power signals output by vector modulators No. 1 and No. 2 at each moment, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment.

[0072] The formation of the input-output amplitude lookup table at all times based on reverse compensation in step 1 includes the following process:

[0073] 1) The data collector uses the front and rear directional couplers of high-frequency power sources 1 and 2 to extract and record the incident driving power signal x of the high-frequency power source at all times 1n 、x 2n And the output power signal y 1n ,y 2n , after being equally divided by the front and rear power distributors of the No. 1 and No. 2 high-frequency power sources and detected by the detector, the input and output signal amplitude values ​​are read through the USB module and recorded in the host computer;

[0074] 2) The host computer directly performs cubic spline interpolation on the data acquired at all times to obtain the input-output characteristic formulas y1=f(x1) and y2=f(x2) of the interpolation points at each time;

[0075] 3) Let y1 = y2 = y, and reversely get x1′, x2′, forming the output power signal y at all times n and the input power signal x 1n ',x 2n 'Amplitude lookup table: To ensure that the output powers y1 and y2 of the two high-frequency power sources reach the same output power y at each moment, the output power of the high-frequency power source at each moment is

[0076] As the independent variable, the host computer inverts the input-output characteristic formula of the two high-frequency power sources to obtain x1=f -1 (y) and x2 = f -1 (y), obtain the input-output amplitude lookup table of what the input powers x1′ and x2′ of the power sources should be at each moment when the two high-frequency power sources reach the same output power y, set the incident driving powers x1′ and x2′ of the power sources at each moment as the target reference values ​​and store them in the DSP control board for subsequent PID processing.

[0077] Furthermore, the USB module in step 2 reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources at each moment, that is, the data collector uses the rear directional couplers of high-frequency power sources No. 1 and 2 to extract the output power signals y1 and y2 of the high-frequency power sources at each moment, and after being equally divided by the rear power dividers of high-frequency power sources No. 1 and 2, the phase information of the output power signals y1 and y2 at each moment is read in the phase detector and the difference is made, and the phase difference of the output power signals at all moments is read through the USB module and recorded in the host computer.

[0078] Furthermore, the DSP control board of step three reads the incident driving power signals x1 and x2 of the two high-frequency power sources at each moment, that is, the data collector uses the front directional couplers of high-frequency power sources No. 1 and 2 to extract the incident driving power signals x1 and x2 of the high-frequency power sources at each moment, and after being equally divided by the front power dividers of high-frequency power sources No. 1 and 2, the incident driving power signals x1 and x2 of the high-frequency power sources at each moment are fed back to the DSP control board as actual measured values ​​for subsequent PID processing.

[0079] Furthermore, the control of the amplitude and phase of the incident driving power signal output by vector modulators No. 1 and No. 2 at each moment in step 4 is specifically as follows:

[0080] 1) Obtain the target amplitude reference value x1′, x2′ and the target reference value of the phase of the incident driving power signal stored in the DSP control board at each moment;

[0081] 2) Use the target amplitude reference value x1′, x2′, target phase reference value and actual measured value x1, x2 at each moment to perform PID error calculation to ensure that the amplitude and phase of the incident drive power signal output by vector modulators No. 1 and 2 at each moment tend to the target reference value.

[0082] Furthermore, the process 2) of step 4 is as follows:

[0083] The DSP control board controls the size of the mutually orthogonal RF I1, Q1, I2, Q2 components of vector modulators No. 1 and No. 2 at each moment according to the difference between the target amplitude reference value x1′, x2′, the target phase reference value and the actual measured value x1, x2 at each moment: the amplitude and phase control of the incident drive power signal x1, x2 output by vector modulators No. 1 and No. 2 at each moment is completed by synthesizing the I component and the Q component in phase. Assuming that the adjusted control voltage of the I component at each moment is Vi and the adjusted control voltage of the Q component is Vq, the amplitude RFout and phase RFout-in of the output signal x1, x2 of vector modulators No. 1 and No. 2 at each moment are:

[0084]

[0085] It should be emphasized that the above specific embodiments are merely explanations of the present invention, and they are not limitations of the present invention. After reading this specification, those skilled in the art can make modifications to the above embodiments without any creative contribution as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A high-frequency amplitude-phase equalization device for a dual-drive quad-resonance cyclotron, comprising a No. 1 vector modulator and a No. 2 vector modulator for providing incident driving power signals to a No. 1 high-frequency power source and a No. 2 high-frequency power source, respectively, and a DSP control board for controlling the amplitude and phase of the incident driving power signals output by the No. 1 vector modulator and the No. 2 vector modulator, respectively, Features: Also included is a data collector connected to vector modulator No. 1, vector modulator No. 2, high-frequency power source No. 1, high-frequency power source No. 2, and the DSP control board respectively; The data collector provides the DSP control board with target amplitude information x of the incident driving power signal of high frequency power sources No. 1 and No. 2 at all times. 1n ',x 2n ' and the phase difference information of the output power signals of high-frequency power sources No. 1 and No. 2, as well as the actual amplitude and phase information x1, x2 of the incident driving power signals of high-frequency power sources No. 1 and No. 2 at each moment; the DSP control board is based on the target amplitude information x1 at all moments provided by the data collector 1n ',x 2n ', the phase difference information at all times, the actual amplitude and phase information x1, x2 of the incident driving power signals of the two high-frequency power sources at each moment, and the target amplitude information, phase difference information and actual amplitude and phase information at each moment are subjected to PID error calculation to realize the control of the amplitude and phase of the incident driving power signals output by vector modulators No. 1 and No. 2 at each moment, so as to ensure that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment; the target amplitude information x 1n ',x 2n ' is the input-output amplitude lookup table information at all moments based on reverse compensation; the said all moments are all moments when the data collector is in working state.

2. The high-frequency amplitude-phase equalization device for a dual-drive quad-resonance cyclotron according to claim 1, characterized in that: The data collector comprises: The following are arranged in sequence at the output end of the No. 1 vector modulator: the No. 1 front power divider and the No. 1 front directional coupler; the following are arranged at the output end of the No. 1 high-frequency power source: the No. 1 rear directional coupler and the No. 1 rear power divider; The following are arranged in sequence at the output end of the No. 2 vector modulator: the No. 2 front power divider and the No. 2 front directional coupler; the following are arranged at the output end of the No. 2 high frequency power source: the No. 2 rear directional coupler and the No. 2 rear power divider; A phase detector is used to receive the phases of the two-way high-frequency power source output power signals collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler, and then equally divided by the No. 1 rear power divider and the No. 2 rear power divider, and make a difference, and send the phase difference signal to the USB module; 4-way detectors, used for receiving incident driving power signals x1, x2 outputted by the two-way vector modulators at each moment after being equally divided by the No. 1 front power divider and the No. 2 front power divider after the incident driving power signals outputted by the two-way vector modulators are collected by the No. 1 front directional coupler and the No. 2 front directional coupler; and receiving output power signals y1, y2 of the two-way high-frequency power sources at each moment after being equally divided by the No. 1 rear power divider and the No. 2 rear power divider after the output power signals of the two-way high-frequency power sources are collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler, and sending the 4-way signals to the USB module; The USB module has an input end connected to 4-way detectors and phase detectors, and an output end connected to the DSP control board; it is used to send the incident driving power signals x1, x2 of the two channels at each moment, the output power signals y1, y2 of the two channels at each moment, and the phase difference signals of the output power signals of the two high-frequency power sources at each moment to the host computer; The host computer is used to receive the incident driving power signals x1, x2 of the two high-frequency power sources at each moment, the output power signals y1, y2 of the two sources at each moment, and the phase difference of the output power signals of the two sources at each moment read by the USB module, record and process the data to form an input-output amplitude lookup table at all moments based on reverse compensation, and store the lookup table and the phase difference in the DSP control board; The No. 1 front directional coupler and the No. 2 front directional coupler respectively collect the incident driving power signals x1 and x2 outputted by the No. 1 vector modulator and the No. 2 vector modulator at each moment; The No. 1 front power divider and the No. 2 front power divider divide the incident driving power signals x1 and x2 collected by the No. 1 front directional coupler and the No. 2 front directional coupler into two paths respectively, one of which outputs the incident driving power signals x1 and x2 at each moment after the division to the DSP control board for the DSP control board to read the amplitude and phase, and the other outputs the incident driving power signals x1 and x2 at each moment after the division to the detector for reading the amplitude; The No. 1 rear directional coupler and the No. 2 rear directional coupler respectively collect the output power signals y1 and y2 at each moment outputted by the No. 1 high-frequency power source and the No. 2 high-frequency power source to the I cavity and the R cavity of the high-frequency resonant cavity; The No. 1 rear power divider and the No. 2 rear power divider divide the respective output power signals collected by the No. 1 rear directional coupler and the No. 2 rear directional coupler at each moment into two paths, one of which outputs the respective output power signals y1, y2 at each moment after the equalization to the phase detector for reading the phase and making a difference, and the other outputs the respective output power signals y1, y2 at each moment after the equalization to the detector for reading the amplitude.

3. A high-frequency amplitude-phase equalization method for a dual-drive quad-resonance cyclotron based on a high-frequency amplitude-phase equalization device for a dual-drive quad-resonance cyclotron according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: The USB module reads the incident driving power signals x1, x2 and the output power signals y1, y2 of the two high-frequency power sources at each moment after detection by the 4-way detectors, and sends them to the host computer. The host computer forms an input-output amplitude lookup table at all moments based on reverse compensation and stores it in the DSP control board; the input-output amplitude lookup table at all moments based on reverse compensation is a plurality of groups of output power signals y1, y2 at all moments. n And the input power signal x at all times 1n ',x 2n 'relationship table, n is the number of rows; x1, x2 contain the amplitude and phase information of the incident driving power signal of the two high-frequency power sources at each moment, y1, y2 contain the amplitude and phase information of the output power signal of the two high-frequency power sources at each moment, x 1n ',x 2n 'Contains the target amplitude information of the incident driving power signals of the two high-frequency power sources at all times; Step 2: The USB module reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources in the phase detector at each moment, and records and stores the phase difference information at all moments in the DSP control board; Step 3: The DSP control board reads the incident driving power signals x1 and x2 of the two high-frequency power sources fed back by the front power distributors No. 1 and No. 2 at each moment; x1 and x2 contain the actual amplitude and phase information of the incident driving power signals of the two high-frequency power sources at each moment; Step 4: In the DSP control board, based on the target amplitude information x at all times stored in step 1 1n ',x 2n ' and the phase difference information at all moments stored in step 2, set the target reference value of the incident drive power signal amplitude and phase at each moment, read the actual amplitude and phase information x1, x2 of the incident drive power signals of the two high-frequency power sources at each moment according to step 3, perform PID error calculation, and realize the control of the amplitude and phase of the incident drive power signals output by vector modulators No. 1 and No. 2 at each moment, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment.

4. The high-frequency amplitude-phase balancing method for a dual-drive quad-resonance cyclotron accelerator according to the high-frequency amplitude-phase balancing device of claim 3, characterized in that: The formation of the input-output amplitude lookup table at all times based on reverse compensation in step 1 includes the following process: 1) The data collector uses the front and rear directional couplers of high-frequency power sources 1 and 2 to extract and record the incident driving power signal x of the high-frequency power source at all times 1n 、x 2n And the output power signal y 1n ,y 2n , after being equally divided by the front and rear power distributors of the No. 1 and No. 2 high-frequency power sources and detected by the detector, the input and output signal amplitude values ​​are read through the USB module and recorded in the host computer; 2) The host computer directly performs cubic spline interpolation on the data acquired at all times to obtain the input-output characteristic formulas y1=f(x1) and y2=f(x2) of the interpolation points at each time; 3) Let y1 = y2 = y, and reversely get x1′, x2′, forming the output power signal y at all times n and the input power signal x 1n ',x 2n 'Amplitude lookup table: that is, to ensure that the output powers y1 and y2 of the two high-frequency power sources reach the same output power y at every moment, let the output power y of the high-frequency power source at every moment be the independent variable, and the host computer inverts the input-output characteristic formula of the two high-frequency power sources to obtain x1=f -1 (y) and x2 = f -1 (y), obtain the input-output amplitude lookup table of what the input powers x1′ and x2′ of the power sources should be at each moment when the two high-frequency power sources reach the same output power y, set the incident driving powers x1′ and x2′ of the power sources at each moment as the target reference values ​​and store them in the DSP control board for subsequent PID processing.

5. The high-frequency amplitude-phase balancing method for a dual-drive quad-resonance cyclotron accelerator according to the high-frequency amplitude-phase balancing device of claim 3, characterized in that: The USB module in step 2 reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources at each moment, that is, the data collector uses the rear directional coupler of high-frequency power sources No. 1 and No. 2 to extract the output power signals y1 and y2 of the high-frequency power sources at each moment, and after being equally divided by the rear power divider of high-frequency power sources No. 1 and No. 2, the phase information of the output power signals y1 and y2 at each moment is read in the phase detector and the difference is made, and the phase difference of the output power signals at all moments is read through the USB module and recorded in the host computer.

6. The high-frequency amplitude-phase equalization method for a dual-drive quad-resonance cyclotron accelerator according to the high-frequency amplitude-phase equalization device of claim 3, characterized in that: The DSP control board of step three reads the incident driving power signals x1 and x2 of the two high-frequency power sources at each moment, that is, the data collector uses the front directional couplers of high-frequency power sources No. 1 and No. 2 to extract the incident driving power signals x1 and x2 of the high-frequency power sources at each moment, and after being equally divided by the front power dividers of high-frequency power sources No. 1 and No. 2, the incident driving power signals x1 and x2 of the high-frequency power sources at each moment are fed back to the DSP control board as actual measured values ​​for subsequent PID processing.

7. The high-frequency amplitude-phase equalization method for a dual-drive quad-resonance cyclotron accelerator according to the high-frequency amplitude-phase equalization device of claim 3, characterized in that: The step 4 implements the control of the amplitude and phase of the incident driving power signal output by the vector modulators No. 1 and No. 2 at each moment, specifically as follows: 1) Obtain the target amplitude reference value x1′, x2′ and the target reference value of the phase of the incident driving power signal stored in the DSP control board at each moment; 2) Use the target amplitude reference value x1′, x2′, target phase reference value and actual measured value x1, x2 at each moment to perform PID error calculation to ensure that the amplitude and phase of the incident drive power signal output by vector modulators No. 1 and 2 at each moment tend to the target reference value.

8. The high-frequency amplitude-phase balancing method for a dual-drive quad-resonance cyclotron accelerator according to the high-frequency amplitude-phase balancing device of claim 7, characterized in that: The process 2) of step 4 is as follows: The DSP control board controls the size of the mutually orthogonal RF I1, Q1, I2, Q2 components of vector modulators No. 1 and No. 2 at each moment according to the difference between the target amplitude reference value x1′, x2′, the target phase reference value and the actual measured value x1, x2 at each moment: the amplitude and phase control of the incident drive power signal x1, x2 output by vector modulators No. 1 and No. 2 at each moment is completed by synthesizing the I component and the Q component in phase. Assuming that the adjusted control voltage of the I component at each moment is Vi and the adjusted control voltage of the Q component is Vq, the amplitude RFout and phase RFout-in of the output signal x1, x2 of vector modulators No. 1 and No. 2 at each moment are:

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