Title :
Feedback optimization in MicroTCA-based LLRF systems
Author :
Qiu, F. ; Michizono, S. ; Miura, T. ; Matsumoto, T. ; Omet, M.
Author_Institution :
HIGH Energy Accel. Res. Organ., KEK, Tsukuba, Japan
Abstract :
Low-level radio frequency (LLRF) control systems are used to achieve extremely precise field control of superconducting cavities in accelerators. Recently, a μTC-based LLRF system has been developed at compact energy recovery linac (cERL) at KEK. To improve the feedback control performance, we have developed some real-time digital signal processing (DSP) algorithms for applications with FPGA in the LLRF systems. We have surveyed the proportional and integral gains to optimized the feedback control. In the cERL, the existence of the parasitic mode in the nine-cell cavity limits the loop gain during the feedback operation. To solve this problem, a high-order IIR filter has been proposed and developed to suppress the parasitic modes. Here, we present these real-time DSP algorithms and FPGA works with preliminary results.
Keywords :
IIR filters; accelerator RF systems; accelerator cavities; feedback; field programmable gate arrays; linear accelerators; nuclear electronics; physical instrumentation control; FPGA; KEK; compact energy recovery linac; feedback control performance; feedback operation; feedback optimization; field control; high-order IIR filter; loop gain; low-level radiofrequency control systems; microTCA-based LLRF systems; parasitic mode; real-time DSP algorithms; real-time digital signal processing algorithms; superconducting cavities; Cavity resonators; Digital signal processing; Field programmable gate arrays; Gain; IIR filters; Signal processing algorithms; Superconducting filters; DSP; FPGA; IIR filter; Low-Level Ratio Frequency;
Conference_Titel :
Real Time Conference (RT), 2014 19th IEEE-NPSS
Print_ISBN :
978-1-4799-3658-8
DOI :
10.1109/RTC.2014.7097435
