1. Beam Instrumentation R&D
Sui Yanfeng
On behalf of CEPC BI Group
Beijing, China

2. Outline Introduction of CEPC beam position monitor BPM electronics R&D
Signal distribution study
Rear Transition Module（RTM）
Advanced Mezzanine Card（AMC）

3. Introduction of CEPC beam position monitor (BPM)
To provide the beam position and orbit, the base of other machine parameters measurement
Apart from some specific BPMs, there will be one BPM for each Q-magnet, the total number of BPM is 2324 in storage ring
There are 1436 BPMs in booster and 70 BPMs in linac.

4. Motivation
To reduce the budget of BI system, due to  a large number of beam position monitors and the high price of  commercial products.
Customized for different part of CEPC. Booster, Linac and storage ring.
Easy to maintain and upgrade.

5. Efforts of BPM electronic
The electronic development is divided into two parts: signal distribution and BPM electronics. +
Signal distribution electronics
BPM electronics

6. Signal distribution study
Amplitude and discriminator method
Amplitude and high speed ADC method

7. Signal distribution study
Using the system clock and system trigger to distribution the different signal

8. The BPM electronics
Micro TCA.4
“AMC+RTM”
DBPM_AMC
DBPM_RTM

9. Efforts of RTM electronic

10. Test of RTM electronic v1.0
Before:
-40dBm
After:
-52dBm
Space signal crosstalk is the main interference ！

11. The modification of the RTM V2.0
Add on Quasi-Crossbar Switch
Exchange amplifier
Control logic circuit
Power supply optimization
。。。

12. Test of RTM electronic v2.0
RTM V1.0 and V2.0 is finished
Bandpass performance RTM V1.0
Bandpass performance RTM V2.0
Significant promotion in bandpass performance and flatness！
2016粒子加速物理与技术实验室年会

13. The temperature of RTM Non shielding 37.5℃ After shielded 26.9℃
2016粒子加速物理与技术实验室年会

14. RF interference shielding cover
1、Shielding RF
2、help cooling down PCB
2016粒子加速物理与技术实验室年会

15. Efforts of AMC electronic
AMC version 1.0
PCB welding（finished）
Power supply debugging （ finished ）
FPGA loading and debugging （ finished ）
ADC & clock（ In progress）

16. AMC PCB board and welding

17. AMC debugging

18. The modification of the AMC
Modify PS to solve overheated
FLASH memory；
Clock circuit；
Global reset function；
。。。

19. Signal processing and algorithm
Xilinx System Generator 结合Matlab实现
The simulation of TBT、COD and Fast modes are finished in Matlab

20. Signal processing and algorithm
The result of TBT Mode
DDC后频谱
经CORDIC后频谱 1

21. Plan of this year Signal distribution solution
Joint debugging of RTM and AMC
Verify signal processing and algorithm in commercial Macro TCA platform

22. Acknowledgement
Thanks to the DBPM R&D Group: Wei Shujun, Du Yaoyao, Ma Huizhou, Liu Fang, Zhang Peng, Wang Zhizhuo.
Thanks also give people who shares pictures of this talk.