Beam size and position measurement based on logarithm processing algorithm in HLS Ⅱ  

作　　者：程超才 孙葆根 杨永良 周泽然 卢平 吴芳芳 王季刚 唐凯 罗箐 李皓 郑佳俊 段青明 

机构地区：[1]National Synchrotron Radiation Laboratory, University of Science and Technology of China

出　　处：《Chinese Physics C》2016年第4期118-124,共7页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11005105,11175173)

摘　　要：A logarithm processing algorithm to measure beam transverse size and position is proposed and preliminary experimental results in Hefei Light Source II（HLS II） are given. The algorithm is based on only 4 successive channels of 16 anode channels of multianode photomultiplier tube（MAPMT） R5900U-00-L16, which has typical rise time of 0.6 ns and effective area of 0.8×16 mm for a single anode channel. In the paper, we first elaborate the simulation results of the algorithm with and without channel inconsistency. Then we calibrate the channel inconsistency and verify the algorithm using a general current signal processor Libera Photon in a low-speed scheme. Finally we get turn-by-turn beam size and position and calculate the vertical tune in a high-speed scheme. The experimental results show that measured values fit well with simulation results after channel differences are calibrated, and the fractional part of the tune in vertical direction is 0.3628, which is very close to the nominal value 0.3621.A logarithm processing algorithm to measure beam transverse size and position is proposed and preliminary experimental results in Hefei Light Source II（HLS II） are given. The algorithm is based on only 4 successive channels of 16 anode channels of multianode photomultiplier tube（MAPMT） R5900U-00-L16, which has typical rise time of 0.6 ns and effective area of 0.8×16 mm for a single anode channel. In the paper, we first elaborate the simulation results of the algorithm with and without channel inconsistency. Then we calibrate the channel inconsistency and verify the algorithm using a general current signal processor Libera Photon in a low-speed scheme. Finally we get turn-by-turn beam size and position and calculate the vertical tune in a high-speed scheme. The experimental results show that measured values fit well with simulation results after channel differences are calibrated, and the fractional part of the tune in vertical direction is 0.3628, which is very close to the nominal value 0.3621.

关 键 词：logarithm processor successive nominal anode fitting verify Hefei preliminary elaborate 

分 类 号：TL506[核科学技术—核技术及应用]