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WWang, H. X.*; Zhang, Y. H.*; Zhou, X. H.*; Liu, M. L.*; Ding, B.*; Li, G. S.*; Hua, W.*; Zhou, H. B.*; Guo, S.*; Qiang, Y. H.*; et al.
Physical Review C, 86(4), p.044305_1 - 044305_11, 2012/10
Times Cited Count：5 Percentile：33.26(Physics, Nuclear)Kondo, Yasuhiro; Ikegami, Masanori*; Naito, Fujio*; Qiang, J.*
Proceedings of 25th International Linear Accelerator Conference (LINAC 2010) (CD-ROM), p.911 - 913, 2010/09
For the beam current upgrade of the J-PARC linac, a new RFQ (RFQ III) is developing. The peak beam current of RFQ III is 50 mA. To increase the peak current form the existing RFQ (RFQ I), the longitudinal and/or transverse emittances are expected to be increased. However, the increase of the longitudinal emittance will affect the performance of the RF chopper system. In this paper, detailed simulations of the RF chopper system are described.
Okawa, Tomohiro; Ikegami, Masanori*; Qiang, J.*; Saha, P. K.
Nuclear Instruments and Methods in Physics Research A, 589(1), p.1 - 12, 2008/04
Times Cited Count：3 Percentile：28.33(Instruments & Instrumentation)To realize the transverse emittance required for the ring injection, a transverse halo collimation system of the charge-exchange type has been developed for J-PARC linac. Negative hydrogen ions constituting a tail portion are charge-exchanged to protons with thin foil collimators. Then, the generated protons are separated by a bending magnet to be delivered to a beam dump. To avoid the uncontrolled beam loss, it is of practical importance to develop an accurate numerical model that has the capability of both particle tracking with space-charge effects and modeling of scattering at the charge-exchange foil. In this paper, a numerical model is developed for the collimation system using a three-dimensional particle-in-cell code, IMPACT, and a Monte-Carlo simulation tool kit, GEANT. Uncontrolled beam loss along the collimation system has been evaluated with this model, and the optimum foil thickness has been determined for the collimation system.
