High frequency amplitude and phase equalization device and method for a double drive four-harmonic cyclotron

Abstract

This invention proposes a high-frequency amplitude and phase equalization device and method for a dual-drive four-resonant cyclotron accelerator. The device includes vector modulators No. 1 and No. 2 for providing incident drive power signals to high-frequency power sources No. 1 and No. 2 respectively; a DSP control board for controlling the amplitude and phase of the incident drive power signals output by vector modulators No. 1 and No. 2 respectively; and a data acquisition unit connected to vector modulators No. 1 and No. 2, high-frequency power sources No. 1 and No. 2, and the DSP control board respectively. The method includes: the DSP control board based on target amplitude information x... 1n ',x 2n Using the phase difference information, actual amplitude, and phase information x1 and x2, PID error calculations are performed to control the amplitude and phase of the incident drive power signals output by vector modulators 1 and 2, ensuring consistency in the amplitude and phase signals of the two high-frequency power sources. This invention proposes a lookup table-based amplitude and phase equalization method to guarantee amplitude and phase balance of the output power of the two high-frequency power sources.

Description

Technical Field

[0001] This invention relates to high-frequency control technology for medical superconducting cyclotrons, specifically to a high-frequency amplitude and phase equalization device and method for a dual-drive four-resonance cyclotron. Background Technology

[0002] The high-frequency power source is a crucial component of the high-frequency system of a cyclotron. The high-frequency power generated by the power source is fed into the high-frequency cavity to excite a high-frequency accelerating electric field. Particles, cyclotronically rotating within the cyclotron, gain energy and are accelerated as they pass through the accelerating gaps in the high-frequency cavity. The dual-power-source driven four-resonant-cavity cyclotron consists of two cavities, I and R. Each cavity contains two double-accelerating-gap resonant high-frequency cavities rigidly connected by conductors in the central region of the cyclotron. Each cavity group has a power coupling device at its tail, which drives the two high-frequency cavities via two high-frequency power sources. A high-frequency signal is output through a low-level system and split into two independent high-frequency signals by a power divider, each driving one of the two high-frequency power sources. The amplitude and phase consistency of the two high-frequency drive power signals are unique characteristics of a dual-power-source driven four-resonant-cavity cyclotron; mismatch will affect the power feed into the two high-frequency cavities.

[0003] The vacuum tetrode used in high-frequency power sources 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 practice, to ensure the operating efficiency of the accelerator, the operating point of the vacuum tetrode is usually selected close to the saturation region, which results in a relatively weak input-output linearity of the high-frequency power source.

[0004] Due to the nonlinear characteristics of high-frequency power sources, the gain and phase shift characteristics of two high-frequency power sources (using two high-frequency power sources to drive four high-frequency cavities) are not exactly the same even when operating in the linear region of a vacuum tetrode. This results in the amplitude and phase of the driving signals for the two sets of high-frequency cavities not always being kept in constant order. Figure 3As shown. Currently, to address this issue, one approach is to manually adjust the attenuation potentiometers of the two power sources to change the amplitude of the high-frequency power source output power. This only ensures the balance of the output power of the two high-frequency power sources after the high-frequency system enters the high-power normal operation phase. However, before low-power startup and before the high-frequency power increases to normal operation, the gain characteristics of the two power sources are still inconsistent compared to the high-power state, and the amplitude consistency of the two power sources cannot be guaranteed. If the attenuation potentiometers are readjusted, manual adjustment is required every time the input power is changed, which is relatively time-consuming and labor-intensive. If only the output power balance at high power is taken as the standard, the output drive power signals of the two power sources will be inconsistent before reaching high power, affecting the power feed of the two sets of high-frequency cavities. On the other hand, adjusting the phase potentiometers of the two power sources manually requires adjustment of the knobs every time the gain of the two high-frequency power sources changes, which is also relatively time-consuming. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by proposing a high-frequency amplitude and phase equalization device and method for a dual-drive four-resonant cyclotron accelerator. The first objective is to solve the problem of difficulty in matching the amplitude and phase of the output signal due to the different gain and phase shift characteristics of the two power sources. The second objective is to solve the problem that manually adjusting the attenuation potentiometer knobs of the two power sources is not only time-consuming and laborious, but also cannot guarantee the amplitude consistency of the two power sources before low-power startup and high-frequency power increase to normal operation.

[0006] To solve its technical problems, the present invention proposes the following technical solutions:

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

[0008] Its features include: it also includes a data acquisition unit that connects to vector modulator 1, vector modulator 2, high-frequency power source 1, high-frequency power source 2, and DSP control board respectively;

[0009] The data acquisition unit provides the DSP control board with target amplitude information x of the incident drive power signal at all times for high-frequency power sources 1 and 2. 1n ',x 2nThe information includes the phase difference between the output power signals of high-frequency power sources 1 and 2, and the actual amplitude and phase information x1 and x2 of the incident drive power signals of high-frequency power sources 1 and 2 at each moment; the DSP control board uses the target amplitude information x1 at all moments provided by the data acquisition unit. 1n ',x 2n The system uses phase difference information at all times, and the actual amplitude and phase information x1 and x2 of the incident drive power signals from the two high-frequency power sources at each time. It then performs PID error calculations on the target amplitude information and phase difference information at each time, along with the actual amplitude and phase information, to control the amplitude and phase of the incident drive power signals output by vector modulators 1 and 2 at each time, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at every time. The target amplitude information x... 1n ',x 2n This refers to the input-output amplitude lookup table information for all times based on reverse compensation; all times refer to all times in the working state of the data acquisition unit.

[0010] Furthermore, the data acquisition device includes:

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

[0012] The following components are sequentially installed at the output of vector modulator No. 2: front power divider No. 2 and front directional coupler No. 2; the following components are installed at the output of high-frequency power source No. 2: rear directional coupler No. 2 and rear power divider No. 2.

[0013] The phase detector is used to receive the phase of the two high-frequency power source output power signals after they have been collected by the No. 1 and No. 2 rear directional couplers and then evenly divided by the No. 1 and No. 2 rear power dividers. The phase difference signal is then sent to the USB module.

[0014] The four detectors are used to receive the incident drive power signals x1, x2 output by the two vector modulators at each moment after the incident drive power signals are collected by the two vector modulators through the first and second front directional couplers and then evenly divided by the first and second front power dividers; and to receive the output power signals y1, y2 of the two high-frequency power sources at each moment after the output power signals are collected by the two high-frequency power sources through the first and second rear directional couplers and then evenly divided by the first and second rear power dividers, and send the four signals to the USB module.

[0015] The USB module has four input terminals connected to a detector and a phase detector, and an output terminal connected to a DSP control board. It is used to send the two incident drive power signals x1, x2 at each moment, the two output power signals y1, y2 at each moment, and the phase difference signals of the two high-frequency power source output power signals at each moment to the host computer.

[0016] The host computer is used to receive the incident drive power signals x1, x2, the output power signals y1, y2, and the phase difference of the output power signals at each moment from the two high-frequency power sources read by the USB module. It records and processes the data to form an input-output amplitude lookup table based on reverse compensation for all moments, and stores the lookup table and phase difference to the DSP control board.

[0017] The No. 1 front directional coupler and the No. 2 front directional coupler respectively acquire the incident drive power signals x1 and x2 of the output of the No. 1 vector modulator and the No. 2 vector modulator at each moment;

[0018] The No. 1 and No. 2 front power dividers divide the incident drive power signals x1 and x2 collected by the No. 1 and No. 2 front directional couplers at each moment into two paths. One path outputs the incident drive power signals x1 and x2 at each moment after division to the DSP control board for the DSP control board to read the amplitude and phase. The other path outputs the incident drive power signals x1 and x2 at each moment after division to the detector for reading the amplitude.

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

[0020] The No. 1 and No. 2 power dividers each divide the output power signals acquired by the No. 1 and No. 2 power directional couplers at each moment into two paths. One path outputs the output power signals y1 and y2 at each moment after division to a phase detector for phase reading and difference calculation. The other path outputs the output power signals y1 and y2 at each moment after division to a detector for amplitude reading.

[0021] A high-frequency amplitude-phase equalization method for a dual-drive four-resonant cyclotron accelerator, characterized by the following steps:

[0022] Step 1: The USB module reads the incident drive power signals x1, x2 and output power signals y1, y2 from the two high-frequency power sources at each moment after detection by four detectors, and sends them to the host computer. The host computer generates an input-output amplitude lookup table based on reverse compensation for all moments and stores it in the DSP control board. The input-output amplitude lookup table based on reverse compensation for all moments consists of multiple sets of output power signals y1, x2, x ... n and the input power signal x at all times 1n ',x 2n The relational table, where n is the row number; x1, x2 contain the amplitude and phase information of the incident drive power signal of the two high-frequency power sources at each moment, and y1, y2 contain the amplitude and phase information of the output power signal of the two high-frequency power sources at each moment. 1n ',x 2n It contains the target amplitude information of the incident drive power signal at all times from the two high-frequency power sources;

[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, records it, and stores the phase difference information at all moments into the DSP control board.

[0024] Step 3: The DSP control board reads the incident drive power signals x1 and x2 from the two high-frequency power sources fed back by the power dividers 1 and 2 at each moment; x1 and x2 contain the actual amplitude and phase information of the incident drive power signals from the two high-frequency power sources at each moment.

[0025] Step 4: In the DSP control board, based on the target amplitude information x stored in Step 1 for all time periods... 1n ',x 2n Based on the phase difference information stored in step two, set the target reference values ​​for the amplitude and phase of the incident drive power signal at each moment. According to step three, read the actual amplitude and phase information x1, x2 of the incident drive power signal of the two high-frequency power sources at each moment, perform PID error calculation, and realize the control of the amplitude and phase of the incident drive power signal output by vector modulators 1 and 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.

[0026] The formation of step one is based on the input-output amplitude lookup table for all moments of reverse compensation, and includes the following process:

[0027] 1) The data acquisition unit uses the front and rear directional couplers of high-frequency power sources 1 and 2 to extract and record the incident drive power signal x at all times of the high-frequency power sources. 1n x 2nand output power signal y 1n y 2n After being evenly distributed by the front and rear power dividers of high-frequency power sources 1 and 2, and detected by the detector, the input and output signal amplitude values ​​are read through the USB module and recorded on the host computer.

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

[0029] 3) Let y1 = y2 = y, and then work backwards to obtain x1′ and x2′, forming the output power signal y at all times. n and input power signal x 1n ',x 2n The amplitude lookup table is used to ensure that the output power y1 and y2 of the two high-frequency power sources reach the same output power y at every moment, so that the output power of the high-frequency power sources at every moment is...

[0030] Using f as the independent variable, the host computer inverts the input-output characteristic formulas for the two high-frequency power sources to obtain x1 = f -1 (y) and x2 = f -1 (y) is used to obtain an input-output amplitude lookup table for the input power x1′ and x2′ of the power source at each moment when the two high-frequency power sources reach the same output power y. The incident drive power x1′ and x2′ of the power source at each moment are set as target reference values ​​and stored in the DSP control board for subsequent PID processing.

[0031] Furthermore, in step two, the USB module reads the phase difference information of the output power signals y1, y2 of the two high-frequency power sources at each moment. That is, the data acquisition unit uses the rear directional couplers of high-frequency power sources 1 and 2 to extract the output power signals y1, y2 of the high-frequency power sources at each moment. After being evenly distributed by the rear power dividers of high-frequency power sources 1 and 2, the phase information of the output power signals y1, y2 at each moment is read in the phase detector and the difference is calculated. The phase difference of the output power signals at all moments is read through the USB module and recorded on the host computer.

[0032] Furthermore, in step three, the DSP control board reads the incident drive power signals x1 and x2 of the two high-frequency power sources at each moment. That is, the data acquisition unit uses the front directional couplers of high-frequency power sources 1 and 2 to extract the incident drive power signals x1 and x2 of the high-frequency power sources at each moment. After being evenly distributed by the front power dividers of high-frequency power sources 1 and 2, the incident drive 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, step four involves controlling the amplitude and phase of the incident drive power signal output by vector modulators 1 and 2 at each moment, as follows:

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

[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, so as to ensure that the amplitude and phase of the incident drive power signal output by vector modulators 1 and 2 at each moment tend to the target reference value.

[0036] Furthermore, step four, process 2), is as follows:

[0037] The DSP control board controls the magnitudes of the orthogonal RF I1, Q1, I2, and Q2 components of vector modulators 1 and 2 at each moment based on the differences between the target amplitude reference values ​​x1′, x2′, the target phase reference value, and the actual measured values ​​x1, x2. The amplitude and phase of the incident drive power signals x1, x2 output by vector modulators 1 and 2 at each moment are controlled by synthesizing the I and Q components in phase. Assuming the adjusted control voltage for the I component is Vi and the adjusted control voltage for the Q component is Vq, the amplitude RFout and phase RFout-in of the output signals x1, x2 of vector modulators 1 and 2 at each moment are:

[0038]

[0039] Advantages and effects of the present invention

[0040] 1. This invention addresses the long-standing problem in engineering practice of high-frequency systems driven by dual high-frequency power sources in four-resonant cavity cyclotron accelerators, where the nonlinear characteristics of the high-frequency power sources lead to difficulties in matching the output power amplitudes of the two high-frequency power sources at low power levels and inconsistent phases between the two paths. It proposes an amplitude-phase equalization method based on a reverse compensation input-output amplitude lookup table. This method controls the input and output power of the high-frequency power sources by adjusting the output amplitude and phase of the I and Q components of the vector modulator, thereby ensuring amplitude-phase equalization of the output power of the two high-frequency power sources.

[0041] 2. This invention achieves automated amplitude and phase uniformity of the output power of two high-frequency power sources by using an amplitude and phase equalization device and method based on a reverse compensation input-output amplitude lookup table. This solves the problem that manually adjusting the attenuation potentiometer knobs of the two power sources is not only time-consuming and laborious, but also cannot guarantee the amplitude consistency of the two power sources before low-power startup and high-frequency power increase to normal operation. Attached Figure Description

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

[0043] Figure 2 A schematic diagram of the high-frequency amplitude and phase equalization device for the improved dual-drive four-resonance cyclotron accelerator based on manual knobs;

[0044] Figure 3 This is a schematic diagram of the input-output nonlinearity of the dual-drive high-frequency power source before the improvement. Detailed Implementation

[0045] Design principle of the invention

[0046] 1. Innovation of this invention: The innovation lies in the use of a high-frequency amplitude and phase equalization device for a dual-drive four-resonant cyclotron accelerator based on a reverse-compensation input-output amplitude lookup table. The reverse compensation is to obtain a target amplitude lookup table. This target amplitude lookup table first processes the input power signals x1, x2 and output power signals y1, y2 of the two measured high-frequency power sources at each moment, obtaining the input power x1 = f at each moment when the two power sources reach the same output power y. -1 (y) and x2 = f -1 (y) A lookup table for the target amplitude to be achieved. DSP is used for pre-distortion processing to control the I and Q values ​​at each moment, adjusting the amplitude and phase of the two vector modulators to ensure that the amplitude and phase signals of the two high-frequency power sources are consistent at each moment.

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

[0048] 3. Solution to the difficulties in this invention: It employs a reverse thinking approach, starting from the result and using an input-output amplitude lookup table based on reverse compensation to deduce the amplitude RFout and phase RFout-in of the output signals x1 and x2 of vector modulators 1 and 2 at each moment when the amplitude and phase signals of the two high-frequency power sources (high-frequency power source 1 and high-frequency power source 2) are consistent.

[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 work backwards to obtain x1′ and x2′, thus forming the output power signal y at all times. n and input power signal x 1n ',x 2n The amplitude lookup table is used to ensure that the output power 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 each moment be 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) is used to obtain an input-output amplitude lookup table for the input power x1′ and x2′ of the power source at each moment when the two high-frequency power sources reach the same output power y. The incident drive power x1′ and x2′ of the power source at each moment are set as target reference values ​​and stored in the DSP control board for subsequent PID processing.

[0053] Based on the above principles, this invention designs a high-frequency amplitude and phase equalization device for a dual-drive four-resonance cyclotron accelerator, such as... Figure 1 As shown, it includes vector modulators No. 1 and No. 2 for providing incident drive power signals to high-frequency power sources No. 1 and No. 2 respectively, and a DSP control board for controlling the amplitude and phase of the incident drive power signals output by vector modulators No. 1 and No. 2 respectively.

[0054] Its features include: it also includes a data acquisition unit that connects to vector modulator 1, vector modulator 2, high-frequency power source 1, high-frequency power source 2, and DSP control board respectively;

[0055] The data acquisition unit provides the DSP control board with target amplitude information x of the incident drive power signal at all times for high-frequency power sources 1 and 2. 1n ',x 2n The information includes the phase difference between the output power signals of high-frequency power sources 1 and 2, and the actual amplitude and phase information x1 and x2 of the incident drive power signals of high-frequency power sources 1 and 2 at each moment; the DSP control board uses the target amplitude information x1 at all moments provided by the data acquisition unit. 1n ',x 2nThe system uses phase difference information at all times, and the actual amplitude and phase information x1 and x2 of the incident drive power signals from the two high-frequency power sources at each time. It then performs PID error calculations on the target amplitude information and phase difference information at each time, along with the actual amplitude and phase information, to control the amplitude and phase of the incident drive power signals output by vector modulators 1 and 2 at each time, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at every time. The target amplitude information x... 1n ',x 2n This refers to the input-output amplitude lookup table information for all times based on reverse compensation; all times refer to all times in the working state of the data acquisition unit.

[0056] Furthermore, the data acquisition device includes:

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

[0058] The following components are sequentially installed at the output of vector modulator No. 2: front power divider No. 2 and front directional coupler No. 2; the following components are installed at the output of high-frequency power source No. 2: rear directional coupler No. 2 and rear power divider No. 2.

[0059] The phase detector is used to receive the phase of the two high-frequency power source output power signals after they have been collected by the No. 1 and No. 2 rear directional couplers and then evenly divided by the No. 1 and No. 2 rear power dividers. The phase difference signal is then sent to the USB module.

[0060] The four detectors are used to receive the incident drive power signals x1, x2 output by the two vector modulators at each moment after the incident drive power signals are collected by the two vector modulators through the first and second front directional couplers and then evenly divided by the first and second front power dividers; and to receive the output power signals y1, y2 of the two high-frequency power sources at each moment after the output power signals are collected by the two high-frequency power sources through the first and second rear directional couplers and then evenly divided by the first and second rear power dividers, and send the four signals to the USB module.

[0061] The USB module has four input terminals connected to a detector and a phase detector, and an output terminal connected to a DSP control board. It is used to send the two incident drive power signals x1, x2 at each moment, the two output power signals y1, y2 at each moment, and the phase difference signals of the two high-frequency power source output power signals at each moment to the host computer.

[0062] The host computer is used to receive the incident drive power signals x1, x2, the output power signals y1, y2, and the phase difference of the output power signals at each moment from the two high-frequency power sources read by the USB module. It records and processes the data to form an input-output amplitude lookup table based on reverse compensation for all moments, and stores the lookup table and phase difference to the DSP control board.

[0063] The No. 1 front directional coupler and the No. 2 front directional coupler respectively acquire the incident drive power signals x1 and x2 of the output of the No. 1 vector modulator and the No. 2 vector modulator at each moment;

[0064] The No. 1 and No. 2 front power dividers divide the incident drive power signals x1 and x2 collected by the No. 1 and No. 2 front directional couplers at each moment into two paths. One path outputs the incident drive power signals x1 and x2 at each moment after division to the DSP control board for the DSP control board to read the amplitude and phase. The other path outputs the incident drive power signals x1 and x2 at each moment after division to the detector for reading the amplitude.

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

[0066] The No. 1 and No. 2 power dividers each divide the output power signals acquired by the No. 1 and No. 2 power directional couplers at each moment into two paths. One path outputs the output power signals y1 and y2 at each moment after division to a phase detector for phase reading and difference calculation. The other path outputs the output power signals y1 and y2 at each moment after division to a detector for amplitude reading.

[0067] A high-frequency amplitude-phase equalization method for a dual-drive four-resonant cyclotron accelerator, characterized by comprising the following steps:

[0068] Step 1: The USB module reads the incident drive power signals x1, x2 and output power signals y1, y2 from the two high-frequency power sources at each moment after detection by four detectors, and sends them to the host computer. The host computer generates an input-output amplitude lookup table based on reverse compensation for all moments and stores it in the DSP control board. The input-output amplitude lookup table based on reverse compensation for all moments consists of multiple sets of output power signals y1, x2, x ... n and the input power signal x at all times 1n ',x2n The relational table, where n is the row number; x1, x2 contain the amplitude and phase information of the incident drive power signal of the two high-frequency power sources at each moment, and y1, y2 contain the amplitude and phase information of the output power signal of the two high-frequency power sources at each moment. 1n ',x 2n It contains the target amplitude information of the incident drive power signal at all times from the two high-frequency power sources;

[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, records it, and stores the phase difference information at all moments into the DSP control board.

[0070] Step 3: The DSP control board reads the incident drive power signals x1 and x2 from the two high-frequency power sources fed back by the power dividers 1 and 2 at each moment; x1 and x2 contain the actual amplitude and phase information of the incident drive power signals from the two high-frequency power sources at each moment.

[0071] Step 4: In the DSP control board, based on the target amplitude information x stored in Step 1 for all time periods... 1n ',x 2n Based on the phase difference information stored in step two, set the target reference values ​​for the amplitude and phase of the incident drive power signal at each moment. According to step three, read the actual amplitude and phase information x1, x2 of the incident drive power signal of the two high-frequency power sources at each moment, perform PID error calculation, and realize the control of the amplitude and phase of the incident drive power signal output by vector modulators 1 and 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.

[0072] The formation of step one is based on the input-output amplitude lookup table for all moments of reverse compensation, and includes the following process:

[0073] 1) The data acquisition unit uses the front and rear directional couplers of high-frequency power sources 1 and 2 to extract and record the incident drive power signal x at all times of the high-frequency power sources. 1n x 2n and output power signal y 1n y 2n After being evenly distributed by the front and rear power dividers of high-frequency power sources 1 and 2, and detected by the detector, the input and output signal amplitude values ​​are read through the USB module and recorded on the host computer.

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

[0075] 3) Let y1 = y2 = y, and then work backwards to obtain x1′ and x2′, forming the output power signal y at all times. n and input power signal x 1n ',x 2n The amplitude lookup table is used to ensure that the output power y1 and y2 of the two high-frequency power sources reach the same output power y at every moment, so that the output power of the high-frequency power sources at every moment is...

[0076] Using f as the independent variable, the host computer inverts the input-output characteristic formulas for the two high-frequency power sources to obtain x1 = f -1 (y) and x2 = f -1 (y) is used to obtain an input-output amplitude lookup table for the input power x1′ and x2′ of the power source at each moment when the two high-frequency power sources reach the same output power y. The incident drive power x1′ and x2′ of the power source at each moment are set as target reference values ​​and stored in the DSP control board for subsequent PID processing.

[0077] Furthermore, in step two, the USB module reads the phase difference information of the output power signals y1, y2 of the two high-frequency power sources at each moment. That is, the data acquisition unit uses the rear directional couplers of high-frequency power sources 1 and 2 to extract the output power signals y1, y2 of the high-frequency power sources at each moment. After being evenly distributed by the rear power dividers of high-frequency power sources 1 and 2, the phase information of the output power signals y1, y2 at each moment is read in the phase detector and the difference is calculated. The phase difference of the output power signals at all moments is read through the USB module and recorded on the host computer.

[0078] Furthermore, in step three, the DSP control board reads the incident drive power signals x1 and x2 of the two high-frequency power sources at each moment. That is, the data acquisition unit uses the front directional couplers of high-frequency power sources 1 and 2 to extract the incident drive power signals x1 and x2 of the high-frequency power sources at each moment. After being evenly distributed by the front power dividers of high-frequency power sources 1 and 2, the incident drive 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, step four involves controlling the amplitude and phase of the incident drive power signal output by vector modulators 1 and 2 at each moment, as follows:

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

[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, so as to ensure that the amplitude and phase of the incident drive power signal output by vector modulators 1 and 2 at each moment tend to the target reference value.

[0082] Furthermore, step four, process 2), is as follows:

[0083] The DSP control board controls the magnitudes of the orthogonal RF I1, Q1, I2, and Q2 components of vector modulators 1 and 2 at each moment based on the differences between the target amplitude reference values ​​x1′, x2′, the target phase reference value, and the actual measured values ​​x1, x2. The amplitude and phase of the incident drive power signals x1, x2 output by vector modulators 1 and 2 at each moment are controlled by synthesizing the I and Q components in phase. Assuming the adjusted control voltage for the I component is Vi and the adjusted control voltage for the Q component is Vq, the amplitude RFout and phase RFout-in of the output signals x1, x2 of vector modulators 1 and 2 at each moment are:

[0084]

[0085] It should be emphasized that the above specific embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to the above embodiments without contributing any inventive step, 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 and phase equalization device for a dual drive four harmonic cyclotron, comprising a first vector modulator and a second vector modulator for providing an incident drive power signal to a first high frequency power source and a second high frequency power source, respectively, and a DSP control board for controlling the amplitude and phase of the incident drive power signal output by the first vector modulator and the second vector modulator, respectively, characterized in that: The data collector is 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 respectively; The data acquisition unit provides the DSP control board with target amplitude information x of the incident drive power signal at all times for high-frequency power sources 1 and 2. 1n ',x 2n The information includes the phase difference between the output power signals of high-frequency power sources 1 and 2, and the actual amplitude and phase information x1 and x2 of the incident drive power signals of high-frequency power sources 1 and 2 at each moment; the DSP control board uses the target amplitude information x1 at all moments provided by the data acquisition unit. 1n ',x 2n The system uses phase difference information at all times, and the actual amplitude and phase information x1 and x2 of the incident drive power signals from the two high-frequency power sources at each time. It then performs PID error calculations on the target amplitude information and phase difference information at each time, along with the actual amplitude and phase information, to control the amplitude and phase of the incident drive power signals output by vector modulators 1 and 2 at each time, ensuring that the amplitude and phase signals of the two high-frequency power sources are consistent at every time. The target amplitude information x... 1n ',x 2n This refers to the input-output amplitude lookup table information for all time points based on reverse compensation. The all moments are all moments of the working state of the data collector; The data collector comprises: The first front directional coupler and the first front power divider are arranged in sequence at the output end of the first vector modulator; The second front directional coupler and the second front power divider are arranged in sequence at the output end of the second vector modulator; The phase detector is used for receiving the phase difference between the two-way high-frequency power source output power signals after the two-way high-frequency power source output power signals are collected through the first rear directional coupler and the second rear directional coupler, are divided through the first rear power divider and the second rear power divider, and sends the phase difference signal to the USB module; The 4-way detector is used for receiving the two-way vector modulator output incident drive power signals x1 and x2 after the two-way vector modulator output incident drive power signals are collected through the first front directional coupler and the second front directional coupler, are divided through the first front power divider and the second front power divider, and receiving the two-way high-frequency power source output power signals y1 and y2 after the two-way high-frequency power source output power signals are collected through the first rear directional coupler and the second rear directional coupler, are divided through the first rear power divider and the second rear power divider, and sends the 4-way signals to the USB module; The USB module is connected with the 4-way detector and the phase detector, and is connected with the DSP control board; the USB module is used for sending the two-way incident drive power signals x1 and x2, the two-way output power signals y1 and y2 and the phase difference signals of the two-way high-frequency power source output power signals to the host computer; The host computer is used for receiving the two-way incident drive power signals x1 and x2, the two-way output power signals y1 and y2 and the phase difference signals of the two-way high-frequency power source output power signals read out by the USB module, recording and processing the data to form an input-output amplitude lookup table based on reverse compensation at all moments, and storing the lookup table and the phase difference into the DSP control board; The first front directional coupler and the second front directional coupler collect the two-way incident drive power signals x1 and x2 output by the first vector modulator and the second vector modulator at each moment respectively; The first front directional coupler and the second front directional coupler collect the two-way incident drive power signals x1 and x2 output by the first vector modulator and the second vector modulator at each moment respectively; The 1st and 2nd front directional couplers collect the respective incident drive power signals x1 and x2 at each moment, and each of the incident drive power signals x1 and x2 is divided into two paths, one of which outputs the respective incident drive power signals x1 and x2 at each moment to the DSP control board for reading the amplitude and phase, and the other of which outputs the respective incident drive power signals x1 and x2 at each moment to the detector for reading the amplitude; The 1st and 2nd rear directional couplers collect the output power signals y1 and y2 of the 1st and 2nd high-frequency power sources output to the I-cavity and R-cavity of the high-frequency resonant cavity at each moment, respectively; The 1st and 2nd rear directional couplers collect the output power signals y1 and y2 of the 1st and 2nd high-frequency power sources output to the I-cavity and R-cavity of the high-frequency resonant cavity at each moment, respectively; 2. A high-frequency amplitude and phase equalization method for a dual-driven four-resonance cyclotron based on the high-frequency amplitude and phase equalization device for a dual-driven four-resonance cyclotron according to claim 1, characterized by, The steps include: Step 1: The USB module reads the incident drive power signals x1, x2 and output power signals y1, y2 from the two high-frequency power sources at each moment after detection by four detectors, and sends them to the host computer. The host computer generates an input-output amplitude lookup table based on reverse compensation for all moments and stores it in the DSP control board. The input-output amplitude lookup table based on reverse compensation for all moments consists of multiple sets of output power signals y1, x2, x ... n and the input power signal x at all times 1n ',x 2n The relational table, where n is the row number; x1, x2 contain the amplitude and phase information of the incident drive power signal of the two high-frequency power sources at each moment, and y1, y2 contain the amplitude and phase information of the output power signal of the two high-frequency power sources at each moment. 1n ',x 2n It contains the target amplitude information of the incident drive power signal at all times from the two high-frequency power sources; Step two, the USB module reads the phase difference information of the output power signals y1 and y2 of the two high-frequency power sources at each moment in the phase detector, records and stores all the phase difference information into the DSP control board; Step three, the DSP control board reads the incident drive power signals x1 and x2 of the two high-frequency power sources at each moment fed back by the 1st and 2nd front power dividers; x1 and x2 contain the actual amplitude and phase information of the incident drive 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 stored in Step 1 for all time periods... 1n ',x 2n 'Based on the phase difference information stored in step two, set the target reference values ​​for the amplitude and phase of the incident drive power signal at each moment. According to step three, read the actual amplitude and phase information x1, x2 of the incident drive power signal of the two high-frequency power sources at each moment, perform PID error calculation, and realize the control of the amplitude and phase of the incident drive power signal output by vector modulators 1 and 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 step one forms an input-output amplitude lookup table at all moments based on reverse compensation, including the following processes: 1) 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 , 2n and the output power signal y 1n , y 2n After the front and rear power dividers of high-frequency power sources 1 and 2 are evenly divided and the detector is detected, the input and output signal amplitude values are read through the USB module and recorded on the host computer. 2) The host computer directly performs cubic spline interpolation on the acquired data at all moments to obtain the input-output characteristic formulas y1 = f(x1) and y2 = f(x2) of the interpolation points at each moment; 3) Let y1=y2=y, back-propagation to get x1', x2', form the output power signal y at all times n and input power signal x 1n ', x 2n ' amplitude lookup table: in order to ensure the output power y1, y2 of the two high-frequency power sources at each moment reaches the same output power y, let the output power y of the high-frequency power source at each moment be the independent variable, the host computer takes the inverse of the input-output characteristic formula of the two high-frequency power sources to get x1=f -1 (y) and x2=f -1 (y), get the input-output amplitude lookup table of the input power x1', x2' of the power source at each moment when the two high-frequency power sources reach the same output power y, set the incident driving power x1', x2' of the power source at each moment as the target reference value stored in the DSP control board for subsequent PID processing.

3. The method for amplitude and phase equalization of high frequency for a dual-driven four-harmonic cyclotron according to claim 2, characterized in that: The step two is that the USB module 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 the 1st and 2nd high-frequency power sources to extract the output power signals y1 and y2 of the high-frequency power sources at each moment, reads the phase information of the output power signals y1 and y2 at each moment in the phase detector after the output power signals y1 and y2 are divided by the rear power dividers of the 1st and 2nd high-frequency power sources, and reads all the phase differences of the output power signals at all moments through the USB module and records them in the host computer.

4. The method for amplitude and phase equalization of high frequency for a dual-driven four-harmonic cyclotron according to claim 2, characterized in that: The DSP control board of the step three reads the incident driving power signal x1, x2 of the high frequency power source at each moment, that is, the data collector extracts the incident driving power signal x1, x2 of the high frequency power source at each moment by using the front directional coupler of the high frequency power source No. 1 and No. 2, and after the incident driving power signal x1, x2 of the high frequency power source at each moment is divided by the front power divider of the high frequency power source No. 1 and No. 2, the incident driving power signal x1, x2 of the high frequency power source at each moment is fed back to the DSP control board as the actual measurement value for subsequent PID processing.

5. The method for amplitude and phase equalization of high frequency for a dual-driven four-harmonic cyclotron according to claim 2, characterized in that: The step four realizes the control of the amplitude and phase of the incident driving power signal output by the vector modulator No. 1 and No. 2 at each moment, and the specific steps are as follows: 1) obtaining the target amplitude reference value x1', x2' and the target phase reference value of the incident driving power signal at each moment stored in the DSP control board; 2) performing PID error operation on the target amplitude reference value x1', x2', the target phase reference value and the actual measurement value x1, x2 at each moment, so that the amplitude and phase of the incident driving power signal output by the vector modulator No. 1 and No. 2 at each moment tend to the target reference value.

6. The method for amplitude and phase equalization of high frequency for a dual-driven four-harmonic cyclotron according to claim 5, characterized in that: The process 2) of the step four is specifically as follows: The DSP control board controls the size of the RF I1, Q1, I2, Q2 components of the 1st and 2nd vector modulators which are orthogonal to each other according to the difference between the target amplitude reference value x1', x2' and the actual measured value x1, x2 at each moment: the control of the amplitude and phase of the incident driving power signal x1, x2 output by the 1st and 2nd vector modulators at each moment is completed by the in-phase synthesis of the I component and the Q component, 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, then the amplitude RFout and the phase RFout-in of the output signal x1, x2 of the 1st and 2nd vector modulators at each moment are:

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