A beam line is built after the IHEP RFQ for halo study. To determine transverse emittance and ellipse parameters of the RFQ output beam, beam size data obtained from the first two of 14 wire scanners are employed. By using the transfer matrix method and the least square method, a set of linear equations were set up and solved. The solutions were then applied as initial beam parameters in multi-particle simulations to check the method of calculation. It is shown that difference between the simulated RMS beam size and the measured one at the measurement location is less than 7%, which is acceptable in our experiments.
@article{arxiv.1505.04531,
title = {Determining phase-space properties of the IHEP RFQ output beam using the RMS beam widths from wire-scanners},
author = {Jun Peng and Tao Huang and Hua-Chang Liu and Hong-Ping Jiang and Peng Li and Fang Li and Jian Li and Mei-Fei Liu and Zhen-Cheng Mu and Cai Meng and Ming Meng and Hua-Fu Ouyang and Lin-Yan Rong and Jian-Min Tian and Biao Wang and Bo Wang and Tao-Guang Xu and Xin-An Xu and Yuan Yao and Wen-Qu Xin and Fu-Xiang Zhao and Lei Zeng and Wen-Zhong Zhou},
journal= {arXiv preprint arXiv:1505.04531},
year = {2015}
}