Institutional Repository of Institute of Modern Physics, CAS
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Electron cooling system in the booster synchrotron of the HIAF project
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The High Intensity heavy ion Accelerator Facility (RAF) is a new accelerator complex under design at the Institute of Modern Physics (IMP). The facility is aiming at the production of high intensity heavy ion beams for a wide range of experiments in high energy density physics, nuclear physics, atomic physics and other applications. It consists of a superconducting electron-cyclotron-resonance ion source and an intense proton ion source, a linear accelerator, a 34 Tin booster synchrotron ring, a 43 Tm multifunction compression synchrotron ring, a 13 Tin high precision spectrometer ring and several experimental terminals. A magnetized electron cooling device is supposed to be used in the booster ring for decreasing the transverse emittance of injected beams. The conceptual design and main parameters of this cooler are presented in this paper. (C) 2015 Elsevier B.V. All rights reserved.</span
HIAF-CRing中的俘获加速效率研究
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">以HIAF-CRing上典型离子~(238)U~(34+)为研究对象,对其纵向俘获和加速的动力学过程进行了研究。累积后的粒子能量为800 MeV/u, 经过绝热俘获和加速后,粒子被加速至1 130 MeV/u。研究结果表明,通过选择适当的俘获时间、绝热参数以及相空间面积因子等参数,应用优化后的高频俘获加速曲线,可以获得更高的俘获和加速效率。通过粒子纵向动力学追踪软件ESM E上进行模拟,得到了优化后的高频相位、高频电压曲线,使得俘获效率达到99.3%,加速效率近乎100%。同时确定出了CRin g高频腔加速U~(34+)所需满足的特性参数,即电压需达到40 kV,频率范围是0:31s0:34 MHz。</span><span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">To reduce the beam loss during the capture and acceleration processes of CRing in HIAF project, the longitudinal beam motion is investigated using the typical ion of ~(238)U~(34+)during the two processes mentioned above. The ions will be captured adiabatically firstly and then will be accelerated from 800 to 1130 MeV/u with a high efficiency using optimized RF voltage and RF phase program. After that the bunched beam will be debunched for the later beam compression. Simulation of these processes by tracking appropriate distributions with the longitudinal beam dynamics code ESME has been used to find optimum parameters such as RF phase, RF voltage. The variation of the parameter during the RF cycle and the character parameters of the RF cavity are presented.</span
HSC加速器的初步大功率加速试验
No full textA novel hybrid single cavity (HSC) linac, formed by combining a radio frequency quadrupole (RFQ) structure and a drift tube (DT) structure into one interdigital-H (IH) cavity, was fabricated, assembled and tested as a proof of principle type injector for cancer therapy synchrotron. The HSC linac is a power-efficient cavity. The low power test and the high power acceleration test were carried out. The low power test results are in good agreement with the calculation results. The high power test results show that the HSC linac can meet the high power test in the next step. ©, 2015, Atomic Energy Press. All right reserved.(5 refs)国家自然科学基金资助项目;中国科学院创新项目资
Wakefield and stopping power of a hydrogen ion beam pulse with low drift velocity in hydrogen plasmas
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">A two-dimensional particle-in-cell (PIC) simulation is carried out to study the wakefield and stopping power for a hydrogen ion beam pulse with low drift velocity propagation in hydrogen plasmas. The plasma is assumed to be collisionless, uniform, non-magnetized, and in a steady state. Both the pulse ions and plasma particles are treated by the PIC method. The effects of the beam density on the wakefield and stopping power are then obtained and discussed. It is found that as the beam densities increase, the oscillation wakefield induced by the beam become stronger. Besides, the first oscillation wakefield behind the bunch is particularly stronger than others. Moreover, it is found that the stationary stopping power increases linearly with the increase of the beam density in the linear/semilinear region.</span