LLRF development of SSRF RF Group and Linac Group

content SSRF RF system of Storage RF system of Booster RF system of Linac LLRF development of booster and storage Linac LLRF SXFEL S-band LLRF C-band LLRF summary

Layout of SSRF

SSRF Status

SSRF RF system of Storage

SSRF RF system of Booster 5-cell normal cavity （ A ） Two 5-cell normal cavity （ B ） one 180kW klystron （ C ） LLRF （ D ） Interlock and monitor

The first generation LLRF controller  RF down-up converter based on Coaxial element  IF signal is generated through DDS  Clock board  DSP development board  Develop field loop, and tuning loop  LabView interface LLRF interface DSP board

The second generation LLRF controller  Six channels ADC 125MSPS  Two channels DAC 275MSPS  Altera ep2s60 FPGA  Ethernet communication port  EPICS interface  Amplitude stability and phase stability achieved better than 0.025% (RMS) and 0.014°(RMS) without klystron or cavity, respectively.  Used at RF cavity of storage ring and booster LLRF controller RF front-end DSP board Amplitude and phase stability LLRF Interface

The third generation LLRF controller Board with CPCI package ， 4 Channel ADC.125MSPS 2 Channel DAC ， 275MSPS 4 down-converter and one up-converter channel Linear is better than 60dB, isolate is better than 70dB CPCI communication. EPICS interface Front-end board DSP board Controller Box ADC: 32k Point FFT, Fin = 20MHz, 80MSPS

the first generation LLRF used in the storage ring RF （ 500MHz ） system signal architecture Stability

The second generation LLRF used in the storage ring The second generation replaced the first one used in RF station one of Storage ring in The second generation replaced the LLRF from ACCEL in Booster RF system in

The third generation LLRF used in the storage ring The third generation replaced the first one used in RF station II and III of Storage ring in

Linac layout of SSRF

Linac LLRF of SSRF

LLRF of SXFEL Linac Group

LLRF RF System of SXFEL Klystron S-Band SSA Deflector SLED 4 Sets of S-Band (2856MHz) 4 Sets of C-Band (5712MHz)

LLRF of S-Band 2856MHz 5712MHz LLRF of C-Band SXFEL Pulse mode and 3us width ; SXFEL repeated 10Hz. Based on Micro-TCA More information contact with Signal Source Trigger LO & CLK MTCA Chassis Solid State Amplifier MTCA under test LLRF architecture of SXFEL

summary First generation ： Development from 2005, corporation with LBL ， It was used in the normal cavity at After , it was used in the superconductivity cavity Second generation ： Development fro m 2010 ， tested in 2013 on line ， used in RF station I of storage ring in , replace the llrf from the ACCEL in Third generation ： Development from used in RF station II and III of storage ring in The Linac LLRF is base on PXI commercial DSP board and coaxial element The LLRF of SXFEL is under development

Thanks