The Test of LLRF control system on superconducting cavity

TL;DR

This paper reports on the development and online testing of a first-generation LLRF control system for superconducting cavities at 162.5MHz, focusing on stability and performance verification.

Contribution

It presents the design and successful implementation of an all-digital LLRF control system for superconducting cavities, including online testing and performance analysis.

Findings

Verified LLRF system stability and performance through online tests

Identified issues and analyzed control system behavior

Accumulated experience for future superconducting cavity control

Abstract

The first generation Low-Level radio frequency(LLRF) control system independently developed by IMPCAS, the operating frequency is 162.5MHz for China ADS, which consists of superconducting cavity amplitude stability control, phase stability control and the cavity resonance frequency control. The LLRF control system is based on four samples IQ quadrature demodulation technique consisting an all-digital closed-loop feedback control. This paper completed the first generation of ADS LLRF control system in the low-temperature superconducting cavities LLRF stability and performance online tests. Through testing, to verify the performance of LLRF control system, to analysis on emerging issues, and in accordance with the experimental data, to summarize LLRF control system performance to accumulate experience for the future control of superconducting cavities.