Space-charge forces acting in mismatched beams have been identified as a major cause of beam halo. In this paper,we describe the beam halo experimental results in a FODO beam line at IHEP. With this beam transport lin...Space-charge forces acting in mismatched beams have been identified as a major cause of beam halo. In this paper,we describe the beam halo experimental results in a FODO beam line at IHEP. With this beam transport line, experiments are carried out to compare the measured data with the multi-particle simulations and to study the formation of a beam halo. The maximum measured amplitudes of the matched and mismatched beam profiles agree well with simulations. Details of the experiment are presented.展开更多
In beam halo experiments, it is very important to correctly characterize the RFQ output proton beam. In order to simulate the beam dynamics properly, we must first know the correct initial beam parameters. We have use...In beam halo experiments, it is very important to correctly characterize the RFQ output proton beam. In order to simulate the beam dynamics properly, we must first know the correct initial beam parameters. We have used two different methods, quadrupole scans and multi-wire scanners to determine the transverse phase-space properties of the proton beam. The experimental data were analyzed by fitting to the 3-D nonlinear simulation code IMPACT. For the quadrupole scan method, we found that the RMS beam radius and the measured beam-core profiles agreed very well with the simulations. For the multi-wire scanner method, we choose the case of a matched beam. By fitting the IMPACT simulation results to the measured data, we obtained the Courant-Snyder parameters and the emittance of the beam. The difference between the two methods is about eight percent, which is acceptable in our experiments.展开更多
中国散裂中子源(CSNS)硼中子俘获治疗(BNCT)实验装置加速器主体由一套速调管功率源和一台RFQ腔体组成,用于给带电粒子提供加速能量。其中,数字低电平控制系统(LLRF, Low Level Radio Frequency control system)用于控制速调管功率源的...中国散裂中子源(CSNS)硼中子俘获治疗(BNCT)实验装置加速器主体由一套速调管功率源和一台RFQ腔体组成,用于给带电粒子提供加速能量。其中,数字低电平控制系统(LLRF, Low Level Radio Frequency control system)用于控制速调管功率源的功率大小,并实现自动老炼、驻波比保护、ARC保护、调频、调谐等功能。本文详细介绍了各个系统的功能以及最终实现的情况。展开更多
基金Supported by NSFC (91126003)the State Key Development Program of Basic Research of China (2007CB209904)
文摘Space-charge forces acting in mismatched beams have been identified as a major cause of beam halo. In this paper,we describe the beam halo experimental results in a FODO beam line at IHEP. With this beam transport line, experiments are carried out to compare the measured data with the multi-particle simulations and to study the formation of a beam halo. The maximum measured amplitudes of the matched and mismatched beam profiles agree well with simulations. Details of the experiment are presented.
基金Supported by National Natural Science Foundation of China(91126003)Key Development Program of Basic Research of China(2007CB209904)
文摘In beam halo experiments, it is very important to correctly characterize the RFQ output proton beam. In order to simulate the beam dynamics properly, we must first know the correct initial beam parameters. We have used two different methods, quadrupole scans and multi-wire scanners to determine the transverse phase-space properties of the proton beam. The experimental data were analyzed by fitting to the 3-D nonlinear simulation code IMPACT. For the quadrupole scan method, we found that the RMS beam radius and the measured beam-core profiles agreed very well with the simulations. For the multi-wire scanner method, we choose the case of a matched beam. By fitting the IMPACT simulation results to the measured data, we obtained the Courant-Snyder parameters and the emittance of the beam. The difference between the two methods is about eight percent, which is acceptable in our experiments.
文摘中国散裂中子源(CSNS)硼中子俘获治疗(BNCT)实验装置加速器主体由一套速调管功率源和一台RFQ腔体组成,用于给带电粒子提供加速能量。其中,数字低电平控制系统(LLRF, Low Level Radio Frequency control system)用于控制速调管功率源的功率大小,并实现自动老炼、驻波比保护、ARC保护、调频、调谐等功能。本文详细介绍了各个系统的功能以及最终实现的情况。
