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1.
中国科学院高能物理研究所提议在中国散裂中子源上建设高性能的实验型缪子源,用于研究缪子科学、中微子物理和下一代高强度缪子、中微子加速器装置的关键技术.俘获超导磁体是实验型缪子源的重要组件之一.俘获磁体在高通量辐照下运行,需要采用耐高辐照的铝基超导卢瑟福电缆绕制线圈.经过上百次的试验,目前成功研制了三根1 500米级的超导...  相似文献   
2.
The production of Λ-hypernuclei in the A(p, K+)ΛB reaction is investigated in the framework of the distorted wave impulse approximation(DWIA). The total cross sections and differential cross sections for various nuclear targets are calculated with an elementary process pN→NKΛ where the additional contributions from the N*(1535) resonance and the final state interaction between p and Λ are included. The dependence of the production cross sections of Λ-hypernuclei on the phenomenological nuclear density and the nucleon number in the target, as well as the distortion effect of the incident proton and outgoing kaon, are also explored. It is shown that the distortion effect tends to decrease the cross  相似文献   
3.
质子束窗是在高功率靶区中的一个分界窗,它将质子输运线上高真空区域和氦容器中的氦环境分开。在其他散裂中子源中质子束窗的热效应以及机械问题都已经被研究过了,但质子束在该窗中散射效应的研究却很少被报导,然而在靶设计中如果没有处理好质子束窗的散射效应会有很大的问题。报导了质子束窗散射效应的模拟计算结果,包括不同质子束窗的材料和结构选择,并以中国散裂中子源(CSNS)为例,介绍了在CSNS一期和二期中质子束窗采用周边水冷的铝合金单层结构,CSNS三期采用中间水冷的铝合金夹层结构。文中给出了不同结构的质子束窗和不同的与靶距离散射效应对靶上经非线性磁铁均匀化的束流分布的影响的模拟计算结果。模拟结果显示质子窗的散射效应对束流损失和靶上的束流分布有重要的影响。  相似文献   
4.
任杰  阮锡超  陈永浩  蒋伟  鲍杰  栾广源  张奇玮  黄翰雄  王朝辉  安琪  白怀勇  鲍煜  曹平  陈昊磊  陈琪萍  陈裕凯  陈朕  崔增琪  樊瑞睿  封常青  高可庆  顾旻皓  韩长材  韩子杰  贺国珠  何泳成  洪杨  黄蔚玲  黄锡汝  季筱璐  吉旭阳  江浩雨  姜智杰  敬罕涛  康玲  康明涛  李波  李超  李嘉雯  李论  李强  李晓  李样  刘荣  刘树彬  刘星言  穆奇丽  宁常军  齐斌斌  任智洲  宋英鹏  宋朝晖  孙虹  孙康  孙晓阳  孙志嘉  谭志新  唐洪庆  唐靖宇  唐新懿  田斌斌  王丽娇  王鹏程  王琦  王涛峰  文杰  温中伟  吴青彪  吴晓光  吴煊  解立坤  羊奕伟  易晗  于莉  余滔  于永积  张国辉  张林浩  张显鹏  张玉亮  张志永  赵豫斌  周路平  周祖英  朱丹阳  朱科军  朱鹏 《物理学报》2020,(17):239-247
在基于白光中子源的中子核反应测量中,伴随中子束的伽马射线是重要的实验本底之一.本文对中国散裂中子源反角白光中子源的束内伽马射线进行了研究.通过蒙特卡罗模拟,得到了伽马射线的能量分布和时间结构.通过直接测量和间接测量两种方法测得低能中子区的束内伽马射线的时间结构.直接测量实验中,将载6Li的ZnS(Ag)闪烁体探测器置于束流线上,通过飞行时间法直接测量束内的中子和伽马射线的时间结构,并利用波形甄别技术进行粒子鉴别.间接测量法是将铅样品置于束流线上,利用C6D6闪烁体探测器测量样品上的散射伽马射线,从而得到入射伽马射线的时间结构.实验测量结果与模拟结果在12μs—2.0 ms的时间区间内具有较好的一致性.  相似文献   
5.
孙纪磊  唐靖宇  敬罕涛 《中国物理 C》2011,35(11):1059-1065
Emittance is an important characteristic of describing charged particle beams. In hadron accelerators, we often meet irregular beam distributions that are not appropriately described by a single rms emittance or 95% emittance or total emittance. In this paper,it is pointed out that in many cases a beam halo should be described with very different Courant-Snyder parameters from the ones used for the beam core. A new method — the Courant-Snyder invariant density screening method - is introduced for analyzing emittance data clearly and accurately. The method treats the emittance data from both measurements and numerical simulations. The method uses the statistical distribution of the beam around each particle in phase space to mark its local density parameter, and then uses the density distribution to calculate the beam parameters such as the Courant-Snyder parameters and emittance for different beam boundary definitions. The method has been used in the calculations for beams from different sources, and shows its advantages over other methods. An application code based on the method including the graphic interface has also been designed.  相似文献   
6.
蒋伟  江浩雨  易晗  樊瑞睿  崔增琪  孙康  张国辉  唐靖宇  孙志嘉  宁常军  高可庆  安琪  白怀勇  鲍杰  鲍煜  曹平  陈昊磊  陈琪萍  陈永浩  陈裕凯  陈朕  封常青  顾旻皓  韩长材  韩子杰  贺国珠  何泳成  洪杨  黄翰雄  黄蔚玲  黄锡汝  季筱璐  吉旭阳  姜智杰  敬罕涛  康玲  康明涛  李波  李超  李嘉雯  李论  李强  李晓  李样  刘荣  刘树彬  刘星言  栾广源  穆奇丽  齐斌斌  任杰  任智洲  阮锡超  宋朝晖  宋英鹏  孙虹  孙晓阳  谭志新  唐洪庆  唐新懿  田斌斌  王丽娇  王鹏程  王琦  王涛峰  王朝辉  文杰  温中伟  吴青彪  吴晓光  吴煊  解立坤  羊奕伟  于莉  余滔  于永积  张林浩  张奇玮  张显鹏  张玉亮  张志永  赵豫斌  周路平  周祖英  朱丹阳  朱科军  朱鹏  CSNS Back-n合作组 《物理学报》2021,(8):190-198
目前国内外的质子标定终端较少,且普遍为单能质子束流.基于中国散裂中子源的反角白光中子源的e V—200 M e V中子能量区间的白光中子束流,以及中子与氢的1H(n,el)反应,可以获得宽能谱的能量连续次级质子.利用1 GSps采样率、12 bit的波形数字化获取系统采集探测器输出波形信号,通过对波形信号的分析,得到中...  相似文献   
7.
The China Spallation Neutron Source (CSNS) is a large scientific facility with the main purpose of serving multidisciplinary research on material characterization using neutron scattering techniques. The accelerator system is to provide a proton beam of 120 kW with a repetition rate of 25 Hz initially (CSNSⅠ), progressively upgradeable to 240 kW (CSNS-Ⅱ) and 500 kW (CSNS-Ⅱ'). In addition to serving as a driving source for the spallation target, the proton beam can be exploited for serving additional functions both in fundamental and applied research. The expanded scientific application based on pulsed muons and fast neutrons is especially attractive in the overall consideration of CSNS upgrade options. A second target station that houses a muon-generating target and a fast-neutron-generating target in tandem, intercepting and removing a small part of the proton beam for the spallation target, is proposed. The muon and white neutron sources are operated principally in parasitic mode, leaving the main part of the beam directed to the spallation target. However, it is also possible to deliver the proton beam to the second target station in a dedicated mode for some special applications. Within the dual target configuration, the thin muon target placed upstream of the fast-neutron target will consume only about 5% of the beam traversed; the majority of the beam is used for fast-neutron production. A proton beam with a beam power of about 60 kW, an energy of 1.6 GeV and a repetition rate of 12.5 Hz will make the muon source and the white neutron source very attractive to multidisciplinary researchers.  相似文献   
8.
9.
中国散裂中子源(CSNS)反角白光中子源束线主要由中子束窗、中子开关、中子准直器和真空管道等组成。为了保证CSNS反角白光中子源束线安全、稳定、可靠地运行,研制了基于EPICS(Experimental Physics and Industrial Control System)软件架构的控制系统。该系统主要由中子束窗、中子开关及中子准直器的运动控制系统、真空控制系统和控制室三部分组成,实现了对反角白光中子源束线主要设备的远程监测和控制。测试结果表明,该系统具有稳定可靠性高、人机交互友好的特点,很好地满足了反角白光中子源束线运行的需要。  相似文献   
10.
对近年来超核物理在理论上及实验上的进展作了简介, 结合即将建成的兰州重离子加速器, 给出了一些可行性的超核物理研究.  相似文献   
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