Minimum Q value self-excitation tuning system and method

Abstract

The invention relates to a minimum Q value self-excitation tuning system and method. The system comprises a self-excitation module, a minimum Q value control module, a motor driving module, a first amplifier, a shunt and a resonant cavity. One end of the shunt is connected with the cavity pressure signal sampling end of the resonant cavity, and the other end of the shunt is connected with the self-excitation module and the minimum Q value control module; the output end of the self-excitation module is connected with the first amplifier and the second input end of the minimum Q value control module; the output end of the first amplifier A1 is connected with the signal input end of the resonant cavity; the output end of the minimum Q value control module is connected with the input end of the motor driving module to determine whether the tuning system is in a resonance state or not, if not, the driving signals are transmitted to the motor driving module; and the output end of the motor driving module is connected with the motor control end of the resonant cavity to perform automatic tuning for the resonant cavity. The minimum Q value self-excitation tuning system and method can be widely applied into an accelerator coordination system.

Description

technical field [0001] The invention belongs to the technical field of high-frequency tuning systems of accelerators, and in particular relates to a minimum Q value self-excited tuning system and a tuning method. Background technique [0002] The detuning of the accelerator cavity will cause a phase shift, which will lead to a decrease in the electric field in the cavity, affecting the acceleration efficiency, and will also cause the coupling of the control IQ loop to affect the stability of the amplitude and phase. In order to realize the tuning control of the accelerator cavity, make the resonant frequency equal to the operating frequency, and keep the amplitude and phase stable, the resonant cavity is usually driven by other excitation drive mode. The system principle is relatively simple, and it has been widely used in the control of the accelerator cavity. system. The disadvantage of using other excitation driving methods is that when the resonant cavity is detuned, th...

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Problems solved by technology

When the loop phase is wrongly adjusted, it is necessary to increase the compensation phase. This compensation can come from the orthogonal frequency and detuning of the superconducting cavity, but the traditional method of amplitude and phase control requires the use of high-precision amplifiers and attenuators. These devices are easily affected by temperature and generate noise, which reduces the system control accuracy and anti-interference ability, causes the cavity to produce helium pressure fluctuations due to power upshoot, reduces the beam quality, and affects the system tuning process

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