Power source low-level all-digital amplitude phase control system for high-energy particle accelerator and implementation method thereof

Abstract

The invention relates to a power source low-level all-digital amplitude phase control system for a high-energy particle accelerator and an implementation method thereof. The method comprises cooperation of signal preprocessing, digital signal processing and digital loop control. An analog circuit component of the signal preprocessing comprises six signal processing channels and one clock processing channel integrated on an analog part, wherein each signal processing channel comprises an attenuator, an amplifier and a filter; and the clock processing channel comprises an attenuator, an amplifier, a filter, a frequency multiplier and a frequency divider. A digital circuit component of the digital signal processing and the digital loop control comprises three A / D (Analog to Digital) converters for sampling six paths of signals, one D / A (Digital to Analog) converter for generating signals and one FPGA (Field Programmable Gate Array) for the digital signal processing and the digital loop control, wherein the three A / D converters, the D / A converter and the FPGA are integrated on a digital part. Through adoption of the power source low-level all-digital amplitude phase control system, the physical structural parameters of a super conduction cavity can be controlled, and high stability of the amplitude and phase of a super conduction cavity driving energy field can be kept.

Description

technical field [0001] The invention belongs to the technical field of high-speed and high-energy particle accelerators, and in particular relates to a power source low-level full-digital amplitude-phase control system for high-energy particle accelerators and a realization method thereof. Background technique [0002] In order to further study the needs of nuclear particle physics, high-speed, high-energy accelerators have become important equipment for modern particle physics and nuclear physics research. The accelerator can accelerate microscopic electrons, protons, heavy ions or other particles to a certain energy, and then interact the accelerated particles with other substances, such as for particle collisions. The research shows that: on the one hand, the surface impedance of the superconducting cavity is small, the energy loss is small when supporting the field energy in the cavity, and it has a very high quality factor Q; the Q value of the cavity is an important in...

AI Technical Summary

Problems solved by technology

On the one hand, due to the shift of the resonant frequency of the superconducting cavity, the cavity will have a greater attenuation of the energy of the driving signal, and more driving energy is required to maintain the original size of the field; on the other hand, due to the resonance When the frequency changes, when the particle beam is injected into the cavity, the initial phase of the accelerating electric field will also shift, and the particles will not be able to accelerate to the desired energy; after injecting the particle beam, the Q value is still 10 7 In a superconducting cavity with an extremely high Q value of the order of magnitude, the impact of disturbance is greater, and it will be very difficult to control and stabilize the amplitude and phase of the field in the superconducting cavity

[0005] Zhang Tongxuan and other scholars published the article "Hardware Design and Implementation of Shanghai Light Source Digital Low-level Control System", which proposed the use of up-down conversion and IQ modulation and demodulation technology, which can achieve amplitude control accuracy of ±1%, frequency control accuracy of ±10Hz and phase The design requirement of control accuracy is ±1°, but there are still the following obvious deficiencies: First, the amplitude and phase of the analog up-and-down conversion circuit are unstable due to the influence of ambient temperature, which affects the amplitude and phase control accuracy; second, the digital sampling frequency is low, and the quantization noise limits the The improvement of amplitude and phase control accuracy; the third is that the phase-locked loop technology is used to generate the local oscillator with frequency conversion up and down. The amplitude stability and phase noise of the local oscillator signal limit the improvement of amplitude and phase control accuracy; Big, not easy for system integration

Images