Radio frequency cavity self-excitation loop control method and system used in accelerator aging or starting process

Abstract

The invention discloses a radio frequency cavity self-excitation loop control method and system used in an accelerator aging or starting process, and the method comprises the steps: measuring the delay time of an excitation signal in a self-excitation loop when a radio frequency cavity is in an offline state; determining a compensation phase according to the delay time; and performing phase compensation on the self-excitation signal in the self-excitation loop according to the determined compensation phase. According to the method and the system provided by the invention, phase compensation is carried out on the self-excitation signal in the self-excitation loop, so that the working frequency of the self-excitation signal follows the resonant frequency of the cavity, and therefore, an anti-detuning target is realized, and the stability of the signal in the radio frequency cavity is improved.

Description

Technical Field

[0001] This invention relates to the field of accelerator technology, and more particularly to a method, system, and storage medium for controlling a radio frequency cavity self-excited loop during accelerator aging or startup. Background Technology

[0002] During accelerator aging, the cavity is in a state of dynamic detuning due to effects such as Lorentz detuning. Existing technology proposes a self-excitation mode to generate an excitation signal frequency that follows the resonant frequency within the cavity in real time, and this mode is therefore applied in accelerator aging to maintain the stability of the resonant frequency within the cavity. However, a delay exists in the loop corresponding to the self-excitation mode. This delay causes the operating frequency in the self-excitation mode to fail to track the real-time resonant frequency within the cavity, thus detuning still exists within the cavity.

[0003] Therefore, the existing technology needs further improvement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide users with a method, system and storage medium for radio frequency cavity self-excited loop control during accelerator aging or startup, overcoming the defect in the prior art that the excitation signal frequency cannot track the resonant frequency in the cavity during accelerator aging.

[0005] The technical solution adopted by this invention to solve the technical problem is as follows: In a first aspect, the present invention discloses a method for controlling a self-excited loop in a radio frequency cavity during accelerator aging or startup, wherein the method is applied to an accelerator in an aging state, and the accelerator's radio frequency cavity is provided with a self-excited loop; the control method includes: The delay time of the excitation signal in the self-excitation loop is measured when the RF cavity is offline. The compensation phase is determined based on the delay time; Phase compensation is performed on the self-excitation signal in the self-excitation loop based on the determined compensation phase.

[0006] Optionally, the step of determining the compensation phase based on the delay time includes: During the self-excitation process, the offset frequency is calculated based on the angular deflection of the acquired cavity pressure signal per unit time. The compensation phase is calculated based on the delay time and offset frequency.

[0007] Optionally, the step of performing phase compensation on the self-excitation signal in the self-excitation loop according to the determined compensation phase includes: An adder is used to perform phase compensation on the self-excitation signal in the self-excitation loop according to the compensation phase.

[0008] Optionally, the control method further includes: Extract the cavity pressure signal within the cavity and amplify the cavity pressure signal using an amplifier; The amplified cavity pressure signal is re-injected into the radio frequency cavity to excite the signal inside the radio frequency cavity.

[0009] Optionally, the step of amplifying the cavity pressure signal using an amplifier includes: The resonant frequency signal is selected by using a resonant circuit and a filter, and the power of the selected resonant frequency signal is amplified step by step by an amplifier to obtain the amplified resonant signal.

[0010] Optionally, the method further includes: When the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, an amplitude-phase closed-loop method is used for switching to achieve target amplitude and target phase locking.

[0011] Optionally, when the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the switching is performed using an amplitude-phase closed-loop method to achieve target amplitude and target phase locking. The steps include: Before the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the amplitude value is adjusted to the target amplitude; when the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the target phase is locked synchronously.

[0012] Secondly, the present invention provides a radio frequency cavity self-excitation loop control system for accelerator aging or startup process, wherein the system is applied to an accelerator in aging state, and the radio frequency cavity of the accelerator is provided with a self-excitation loop and a delay compensation module connected to the self-excitation loop. The delay compensation module is used to measure the delay time of the excitation signal in the self-excitation loop when the radio frequency cavity is offline; determine the compensation phase based on the delay time; and perform phase compensation on the self-excitation signal in the self-excitation loop based on the determined compensation phase.

[0013] Optionally, an amplifier is provided in the self-excited loop; The amplifier is used to amplify the cavity pressure signal so that when the amplified cavity pressure signal is reinjected into the radio frequency cavity, the signal in the radio frequency cavity is excited.

[0014] Optionally, the self-excitation loop is further connected to a mode switching module. The mode switching module is used to switch the accelerator cavity from self-excitation mode to generator-driven resonant mode by means of amplitude and phase closed loop, so as to lock the target amplitude and target phase.

[0015] Beneficial effects: This invention discloses a method and system for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup. The method involves measuring the delay time of the excitation signal in the self-excited loop while the radio frequency cavity is offline; determining a compensation phase based on the delay time; and performing phase compensation on the self-excited signal in the self-excited loop based on the determined compensation phase. The method and system provided by this invention achieve phase compensation of the self-excited signal in the self-excited loop, enabling the operating frequency of the self-excited signal to follow the resonant frequency of the cavity, thereby achieving the goal of anti-detuning and improving the stability of the signal within the radio frequency cavity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a loop in the self-excitation mode of the prior art; Figure 2 This is a flowchart of the steps of the radio frequency cavity self-excited loop control method used in the accelerator aging or startup process in an embodiment of the present invention; Figure 3 This is a schematic diagram of the loop in the anti-detuning self-excitation mode in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] Newly manufactured or assembled accelerators will have certain surface defects and physically and chemically adsorbed molecules. These non-ideal conditions can cause the accelerator's dielectric constant, permeability, and surface structure to deviate from the design values, leading to reduced accelerator performance or even rendering it unusable. Therefore, it is necessary to age the accelerator using high-voltage discharge and thermal effects to ensure that the main parameters of its internal surface are the same as the design values, thus meeting the design performance requirements.

[0019] When an accelerator ages, the cavity will be in a state of dynamic detuning due to effects such as Lorentz detuning. Since the frequency of the excitation signal generated by the self-excited loop (SEL) tracks the resonant frequency of the superconducting cavity, it is widely used in the aging of superconducting accelerators.

[0020] The basic loop of SEL is as follows: Figure 1As shown, after the excitation signal is demodulated by IQ, it is superimposed on the phase by a cordic and an adder. Then, a limiter with an upper limit of A is set to avoid positive feedback in the loop causing the signal to be amplified infinitely. Self-excitation can be achieved through this self-excitation loop. Except for the resonant cavity, up and down conversion and ADC parts which are implemented in hardware, all other related algorithms are implemented in firmware.

[0021] The closed-loop transfer function of the SEL mode is shown below: ; because When the imaginary part of the transfer function is 0, i.e. in SEL mode The loop can be stable when the following formula is satisfied.

[0022] ; When the system starts to oscillate, the equation needs to satisfy the following conditions: =0, that is .

[0023] The SEL loop contains inherent delays. Hardware modules such as the analog-to-digital converter (ADC), digital-to-analog converter (DAC), mixer, and filter for RF signals have fixed processing delays. Additionally, the propagation of the RF signal through the cable introduces further delays. These delays are amplified during the aging process, where the cavity power changes rapidly. Because the SEL mode requires the peak of the input excitation signal to continuously overlap with the peak of the resonant frequency within the resonant cavity, the presence of these delays prevents the SEL operating frequency from tracking the real-time frequency shift, leading to detuning. Especially in room-temperature cavities, the resonant frequency shifts by more than 400kHz before and after aging. At this point, the phase shift caused by the delay is extremely large, making it difficult for the SEL mode to follow.

[0024] Furthermore, during the aging process, factors such as surface heating of the cavity and external environmental vibrations can cause changes in the cavity's resonant frequency, and this frequency shift increases with increasing input power. To tune the cavity and meet the required tuning frequency accuracy, a dual-tuning mechanism using a motor and a Piezo switch is employed. However, during cavity aging, the resonant frequency continuously changes with increasing power. If tuning were performed solely through the motor and Piezo switch, the constant adjustments to the electron gun would negatively impact the lifespan of both components.

[0025] To improve the stability of the radio frequency cavity and obtain a stable cavity, this invention provides a method and system for controlling the self-excited loop of the radio frequency cavity during the aging or startup process of an accelerator. The method performs phase compensation on the self-excited loop of the radio frequency during the aging or startup process, which solves the problem of frequency drift within the cavity. This allows the phase-compensated loop frequency to follow the cavity resonant frequency in real time, avoiding detuning and thus obtaining a stable cavity field.

[0026] The following description, in conjunction with the accompanying drawings, provides a more detailed account of a radio frequency cavity self-excited loop control method, system, and storage medium used in the aging or startup process of an accelerator.

[0027] This invention discloses a method for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup, such as... Figure 2 This method is applied to accelerators in an aging state, wherein a self-excited loop is provided within the accelerator's radio frequency cavity; the control method includes: Step S1: With the RF cavity offline, measure the delay time of the excitation signal in the self-excitation loop.

[0028] Before performing the aging process on the accelerator, the RF cavity is first placed offline to measure the delay time of the excitation signal in the self-excitation loop within the RF cavity.

[0029] Specifically, placing the RF cavity offline requires both hardware and software operations. Hardware operations include disconnecting the power and signal connections. For example, first, turn off the DC bias power supply and RF excitation power supply of the RF cavity to ensure no current flows through the cavity. Then, perform signal isolation by disconnecting the RF input / output ports to prevent false excitation or signal reflection. Additionally, the cavity can be briefly grounded through a high-impedance grounding device to release residual charge and prevent damage from electrostatic discharge or induced voltage. Software operations include disabling automatic control and protection logic, status flags and access control, and data logging and backup.

[0030] Because of the inherent delay within the self-excited loop, the excitation frequency under self-excitation during aging does not follow the real-time cavity frequency. This step measures the delay to facilitate further calculations. Since this delay remains constant whether the RF cavity is offline or operational, this step measures the delay time of the excitation signal in the self-excited loop when the RF cavity is offline to perform frequency regulation. In one implementation, the delay time is measured by using a clock to measure the time difference between the signal input and output, thus obtaining the signal delay time throughout the entire loop.

[0031] Step S2: Determine the compensation phase based on the delay time.

[0032] In this step, the phase value that needs to be compensated is determined based on the correlation between the delay time and the compensation phase.

[0033] Specifically, the step of determining the compensation phase based on the delay time includes: during the self-excitation process, calculating the offset frequency based on the angular deflection of the acquired cavity pressure signal per unit time; and calculating the compensation phase based on the delay time and the offset frequency.

[0034] In detail, the delay time The correlation between K and the compensation coefficient is: K= That is, based on the measured delay time through the above relationship. The delay compensation coefficient can be calculated. Since the delay compensation coefficient is the angular deflection of the system phase during the delay time, and because the delay is not affected by external factors such as frequency, the delay compensation coefficient remains unchanged during accelerator aging or normal operation. Therefore, the delay time is recorded in the firmware algorithm. By acquiring the phase change of the cavity pressure signal over time in self-excitation mode, that is, the angular offset per unit time, the offset frequency is calculated based on the angular offset. Finally, the compensated phase is calculated based on the measured delay time and offset frequency.

[0035] In practical applications, combined with Figure 3 As shown, the delay compensation algorithm can read the current phase value output by the cordic. The deflection frequency is calculated by the relationship between the phase value and unit time. Specifically: Through formula The current deflection frequency is calculated. .

[0036] Furthermore, the relationship between the deflection frequency and the compensation coefficient is as follows: This refers to the phase that needs compensation.

[0037] Step S3: Perform phase compensation on the self-excitation signal in the self-excitation loop according to the determined compensation phase.

[0038] Combination Figure 3 As shown, in practical implementation, an adder is used to achieve real-time compensation for the delay in order to overcome the detuning caused by the loop delay and thus obtain a stable resonant frequency.

[0039] This step calculates the offset frequency in real time and converts the corresponding delay at the offset frequency into a loop phase shift. This allows for the prediction and compensation of the drift trend at the current cavity resonant frequency, thereby eliminating the phase error caused by the loop delay and achieving the purpose of resisting delay interference and tracking the offset frequency in real time.

[0040] Furthermore, the step of performing phase compensation on the self-excitation signal in the self-excitation loop based on the determined compensation phase includes: An adder is used to perform phase compensation on the self-excitation signal in the self-excitation loop according to the compensation phase.

[0041] Furthermore, to avoid the problem of the electron gun's lifespan being affected by constant adjustments due to tuning via the motor and Piezo, the control method further includes: Extract the cavity pressure signal within the cavity and amplify the cavity pressure signal using an amplifier; The amplified cavity pressure signal is re-injected into the radio frequency cavity to excite the signal inside the radio frequency cavity.

[0042] Since the accelerator cavity acts as a narrowband filter, only signals at the accelerator's resonant frequency can enter the cavity. Once inside, the signal is excited by cavity pressure, the peak of which is located at the cavity's resonant frequency. This cavity pressure signal is extracted, amplified by an amplifier (SSA), and then reinjected into the resonant cavity, thus exciting the signal within. In other words, by changing the frequency of the excitation signal, it tracks changes in the cavity's resonant frequency. This extends the lifespan of the motor and Piezo and reduces the demand for RF power. When the resonant frequency shifts, the accelerator's operating frequency also shifts, and the entire loop's operating frequency moves with the cavity's resonant frequency. This method achieves immunity to detuning interference.

[0043] Specifically, the step of amplifying the cavity pressure signal using an amplifier includes: The resonant frequency signal is selected by using a resonant circuit and a filter, and the power of the selected resonant frequency signal is amplified step by step by an amplifier to obtain the amplified resonant signal.

[0044] Furthermore, after obtaining the amplified resonant signal using an amplifier in this step, the amplified resonant signal is fed into the radio frequency cavity to establish a high-frequency electromagnetic field within the radio frequency cavity. This electromagnetic field accelerates the charged particles within the cavity, thereby obtaining the target acceleration gradient.

[0045] This step proposes to achieve the purpose of resisting detuning interference by changing the excitation signal frequency. Compared with the existing technology that uses the dual tuning mechanism of motor and Piezo to improve the frequency modulation accuracy, it effectively avoids the defects of life loss caused by frequent tuning of motor and Piezo.

[0046] Furthermore, since traditional accelerator cavities use an IQ closed-loop approach when switching from SEL to GDR mode, the following relationship exists between I and Q: ; The formula shows the desired adjustment. and With the current phase Regarding the self-excitation mode, which requires down-conversion, in practical applications, the current frequency of the self-excitation loop and the down-conversion frequency are not exactly equal, requiring a further adjustment. Compensation, therefore the phase when the loop is stable It is also constantly changing. To calculate the current phase value in the SEL, the SEL loop needs to be adjusted from closed-loop control to open-loop control before switching. At this time, the sudden change in signal amplitude and phase may cause instantaneous fluctuations in the Lorentz force, which in turn may cause the cavity pressure to collapse.

[0047] To address the above problems, the method further includes: When the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, an amplitude-phase closed-loop method is used for switching to achieve target amplitude and target phase locking.

[0048] Specifically, when the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the switching is performed using an amplitude-phase closed-loop method to lock the target amplitude and target phase. The steps include: When the accelerator cavity is in self-excitation mode, that is, before switching from self-excitation mode to generator-driven resonant mode, the amplitude value is adjusted to the target amplitude value; when the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the target phase lock is executed synchronously.

[0049] Because the relationship between amplitude and phase satisfies: ; Since changing the amplitude and phase will not produce additional effects, this step adopts the amplitude-phase closed-loop method for switching and changes the mode of closing the amplitude and phase simultaneously in the traditional amplitude-phase closed-loop. In SEL mode, the amplitude is closed first to change the amplitude to the desired amplitude in GDR mode. Then, after switching to GDR mode, the desired phase is locked, thus realizing the dynamic switching strategy to suppress the Lorentz detuning effect.

[0050] In detail, the amplitude-phase closed-loop method is a control system that simultaneously controls the amplitude and phase of a signal through a feedback mechanism. It monitors the amplitude and phase of the output signal in real time, compares them with the target value to generate an error signal, and then adjusts system parameters, such as excitation power or tuning frequency, to ensure the output signal accurately tracks the target value. The closed-loop method utilizes the amplitude-phase-frequency characteristics of the open-loop system to determine its stability.

[0051] Specifically, the steps to complete the amplitude closed-loop control within SEL mode and transform the amplitude into the desired amplitude in GDR mode include: first, determining the target amplitude; placing the accelerator system in SEL mode and ensuring all subsystems are in normal working order, including power amplifiers, sensors, and controllers; setting the initial parameters for amplitude closed-loop control, which, if using PID control, requires setting the proportional, integral, and derivative coefficients of the PID controller; and then, starting amplitude feedback using amplitude monitoring devices, such as amplitude sensors, to monitor the amplitude of the output signal in real time and feed the monitored amplitude value back to the controller, forming a closed-loop control circuit. The controller compares the monitored amplitude value with the desired target amplitude value in GDR mode and calculates the amplitude error. Based on the calculated amplitude error, the controller generates amplitude control commands according to a preset control algorithm. These commands are sent to actuators, such as power amplifiers, to adjust their output parameters and reduce the amplitude difference between the monitored and target amplitude values. Through repeated feedback, comparison, calculation, and amplitude adjustment, the amplitude of the output signal is stabilized at the target amplitude value in GDR mode.

[0052] Furthermore, the desired phase is locked only after the accelerator system switches to GDR mode. The specific steps include: first, setting a target phase value, which can be a fixed value or a dynamically changing phase value; then, measuring the phase value within the current system and feeding it back to the controller; the controller generating a corresponding phase control command based on the error between the phase measurement value and the target phase value, and sending the phase control command to the command execution mechanism to adjust the output parameters of the adjuster to reduce the phase error.

[0053] This invention provides a method for controlling the self-excited loop of an RF cavity during accelerator aging or startup, improving the stability of the accelerator in aging or startup states based on three different aspects. Specifically, firstly, by offline testing to determine the impact of loop delay on phase, the offset frequency is calculated in real time, and the corresponding delay is converted into a loop phase shift to supplement the SEL self-excited loop. Secondly, by utilizing the inherent characteristics of the SEL to make the excitation signal frequency follow the cavity's resonant frequency, the purpose of resisting detuning interference is achieved. Thirdly, by changing the closed-loop method and operation sequence of switching from SEL mode to GDR mode, the Lorentz detuning effect is suppressed, thereby enabling the accelerator to automatically compensate for the phase error caused by delay in SEL mode, and to smoothly switch from SEL mode to GDR mode after aging, thus improving the system stability of the accelerator in aging or startup states.

[0054] Secondly, the present invention provides a radio frequency cavity self-excitation loop control system for accelerator aging or startup process, applied to an accelerator in aging state, wherein the radio frequency cavity of the accelerator is provided with a self-excitation loop and a delay compensation module connected to the self-excitation loop. The delay compensation module is used to measure the delay time of the excitation signal in the self-excitation loop when the radio frequency cavity is offline; determine the compensation phase based on the delay time; and perform phase compensation on the self-excitation signal in the self-excitation loop based on the determined compensation phase.

[0055] Furthermore, an amplifier is provided in the self-excitation loop; the amplifier is used to amplify the cavity pressure signal so that after the amplified cavity pressure signal is re-injected into the radio frequency cavity, the signal in the radio frequency cavity is excited.

[0056] Furthermore, the self-excitation loop is also connected to a mode switching module; the mode switching module is used to switch in an amplitude-phase closed-loop manner when the accelerator cavity switches from the self-excitation mode to the generator-driven resonant mode, so as to lock the target amplitude and the target phase.

[0057] This invention discloses a method and system for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup. The method involves measuring the delay time of the excitation signal in the self-excited loop while the radio frequency cavity is offline; determining a compensation phase based on the delay time; and performing phase compensation on the self-excited signal in the self-excited loop based on the determined compensation phase. The method and system provided by this invention achieve phase compensation of the self-excited signal in the self-excited loop, enabling the operating frequency of the self-excited signal to follow the resonant frequency of the cavity, thereby achieving the goal of anti-detuning and improving the stability of the signal within the radio frequency cavity.

[0058] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0059] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application.

Claims

1. A method for controlling a self-excited loop in a radio frequency cavity during accelerator aging or startup, characterized in that, The method is applied to an accelerator in an aging state, wherein a self-excited loop is provided within the accelerator's radio frequency cavity; the control method includes: The delay time of the excitation signal in the self-excitation loop is measured when the RF cavity is offline. The compensation phase is determined based on the delay time; Phase compensation is performed on the self-excitation signal in the self-excitation loop based on the determined compensation phase.

2. The method for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup as described in claim 1, characterized in that, The step of determining the compensation phase based on the delay time includes: During the self-excitation process, the offset frequency is calculated based on the angular deflection of the acquired cavity pressure signal per unit time. The compensation phase is calculated based on the delay time and offset frequency.

3. The method for controlling the self-excited loop of the radio frequency cavity during accelerator aging or startup as described in claim 2, characterized in that, The step of performing phase compensation on the self-excitation signal in the self-excitation loop based on the determined compensation phase includes: An adder is used to perform phase compensation on the self-excitation signal in the self-excitation loop according to the compensation phase.

4. The method for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup as described in claim 1, characterized in that, The control method further includes: Extract the cavity pressure signal within the cavity and amplify the cavity pressure signal using an amplifier; The amplified cavity pressure signal is re-injected into the radio frequency cavity to excite the signal inside the radio frequency cavity.

5. The method for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup as described in claim 4, characterized in that, The step of amplifying the cavity pressure signal using an amplifier includes: The resonant frequency signal is selected by using a resonant circuit and a filter, and the power of the selected resonant frequency signal is amplified step by step by an amplifier to obtain the amplified resonant signal.

6. The method for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup as described in claim 1, characterized in that, The method further includes: When the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, an amplitude-phase closed-loop method is used for switching to achieve target amplitude and target phase locking.

7. The method for controlling the self-excited loop of a radio frequency cavity during accelerator aging or startup as described in claim 6, characterized in that, When the accelerator cavity switches from self-excited mode to generator-driven resonant mode, the switching is performed using an amplitude-phase closed-loop method to achieve target amplitude and target phase locking. The steps include: Before the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the amplitude value is adjusted to the target amplitude; when the accelerator cavity switches from self-excitation mode to generator-driven resonant mode, the target phase is locked synchronously.

8. A radio frequency cavity self-excited loop control system for accelerator aging or startup processes, characterized in that, Applied to accelerators in a mature state, the accelerator's radio frequency cavity is equipped with a self-excitation loop and a delay compensation module connected to the self-excitation loop; The delay compensation module is used to measure the delay time of the excitation signal in the self-excitation loop when the radio frequency cavity is offline. The compensation phase is determined based on the delay time, and the phase compensation is performed on the self-excitation signal in the self-excitation loop based on the determined compensation phase.

9. The radio frequency cavity self-excited loop control system for accelerator aging or startup process according to claim 8, characterized in that, An amplifier is provided in the self-excited loop; The amplifier is used to amplify the cavity pressure signal so that when the amplified cavity pressure signal is reinjected into the radio frequency cavity, the signal in the radio frequency cavity is excited.

10. The radio frequency cavity self-excited loop control system for accelerator aging or startup process according to claim 8, characterized in that, The self-excitation loop is also connected to a mode switching module. The mode switching module is used to switch the accelerator cavity from self-excitation mode to generator-driven resonant mode by means of amplitude and phase closed loop, so as to lock the target amplitude and target phase.

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