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Upgrade of the sextupole field for beam instability mitigation in rapid cycling synchrotron of china spallation neutron source

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Radiation Detection Technology and Methods 2023年第4期7卷 550-560页

作者： Liangsheng Huang Yuwen An Changdong Deng Yuan Huang Shouyan Xu Dongguan Campus Institute of High Energy PhysicsChinese Academy of Sciences(CAS)Dongguan523803China spallation neutron source Science Center Dongguan523803China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China

Background The china spallation neutron source incorporates a rapid cycling synchrotron(RCS)that operates by accumulating protons at 80 MeV and subsequently accelerating them to 1.6 GeV within a time span of 20 *** beam is guided to striking the tungsten target for neutron *** As a space charge dominated machine,the RCS is subject to space charge effects and momentum spread,hereby influencing the tune *** address this issue,sextupole magnets,powered by two families of DC power supply,were initially employed to decrease the absolute value of chromaticity and to control the tune *** head-tail instability has been observed during the RCS beam *** The beam tests and simulations were conducted,revealing that tuning the chromaticity proved to be an effective mitigation ***,to achieve better control over the tune spread and further suppress the instability,the DC sextupole field has been upgraded to an AC sextupole field,aiming to provide dynamic for controlling the chromaticity over an acceleration *** and conclusion Thanks to the upgraded of AC field,the instability has been fully mitigated with beam power of 100 kW and the transmission in the RCS has been improved by~2%from 96 to 98%.With help of AC sextupole at present,the beam power in the RCS is increased to 140 kW.

关键词： china spallation neutron source Rapid cycling synchrotron Sextupole field Chromaticity Head-tail instability

Analysis of radiation environmental safety for china's spallation neutron source (CSNS)

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Chinese Physics C 2010年第7期34卷 1029-1036页

作者：王庆斌吴青彪马忠剑张清江李楠吴靖民刘剑张刚 Institute of High Energy Physics CAS

The china spallation neutron source（CSNS） is going to be located in Dalang Town,Dongguan City in the Guangdong *** this paper we report the results of the parameters related with environment safety based on experiential calculations and Monte Carlo *** main project of the accelerator is an under ground *** top there is a 0.5 m concrete and 5.0 m soil covering for shielding,which can reduce the dose out of the tunnel＇s top down to 0.2 μSv/*** the residents on the boundary of the CSNS,the dose produced by skyshine,which is caused by the penetrated radiation leaking from the top of the accelerator,is no more than 0.68 μSv/*** CSNS is operating normally,the maximal annual effective dose due to the emission of gas from the tunnel is 2.40×10-3 mSv/a to the public adult,and 2.29×10-3 mSv/a to a child,both values are two orders of magnitude less than the limiting value for control and *** may give rise to an activation of the soil and groundwater in the nearest tunnels,where the main productions are 3H,7Be,22Na,54Mn,*** the specific activity is less than the exempt specific activity in the national standard *** it is safe to say that the environmental impact caused by the activation of soil and groundwater is *** sum up,for CSNS,as a powerful neutron source device,driven by a highenergy high-current proton accelerator,a lot of potential factors affecting the environment ***,as long as effective shieldings for protection are adopted and strict rules are drafted,the environmental impact can be kept under control within the limits of the national standard.

关键词： china spallation neutron source environmental safety effective dose specific activity

First neutron Bragg-edge imaging experimental results at CSNS

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Chinese Physics B 2021年第9期30卷 45-48页

作者： Jie Chen Zhijian Tan Weiqiang Liu Sihao Deng Shengxiang Wang Liyi Wang Haibiao Zheng Huaile Lu Feiran Shen Jiazheng Hao Xiaojuan Zhou Jianrong Zhou Zhijia Sun Lunhua He Tianjiao Liang Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China spallation neutron source Science Center(SNSSC) Dongguan 523803China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The neutron Bragg-edge imaging is expected to be a new non-destructive energy-resolved neutron imaging technique for quantitatively two-dimensional or three-dimensional visualizing crystallographic information in a bulk material,which could be benefited from pulsed neutron *** we build a Bragg-edge imaging system on the General Purpose Powder Diffractometer at the china spallation neutron *** residual strain mapping of a bent Q235 ferrite steel sample has been achieved with a spectral resolution of 0.15%by the time-of-flight neutron Bragg-edge imaging on this *** results show its great potential applications in materials science and engineering.

关键词： neutron Bragg-edge imaging china spallation neutron source

Introduction to the overall physics design of CSNS accelerators

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Chinese Physics C 2009年第S2期33卷 1-3页

作者：王生方守贤傅世年刘渭滨欧阳华甫秦庆唐靖宇韦杰 Institute of High Energy Physics CAS

The china spallation neutron source (CSNS) is an accelerator-based facility. The accelerator of CSNS consists of a low energy linac, a Rapid Cycling Synchrotron (RCS) and two beam transport lines. The overall physics design of CSNS accelerator is described, including the design principle, the choice of the main parameters and design of each part of accelerators. The key problems of the physics design, such as beam loss and control, are also discussed. The interface between the different parts of accelerator, as well as between accelerator and target, are introduced.

关键词： china spallation neutron source rapid cycling synchrotron physics design

The machine protection system for CSNS

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Radiation Detection Technology and Methods 2021年第2期5卷 273-279页

作者： Kang Mingtao Zhang Yuliang Jin Dapeng He Yongcheng Zhan Mingchuan Zhu Peng Wu Xuan Guo Fengqin Wang Lin Institute of High Energy Physics CASBeijing 100049China spallation neutron source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China

Background The china spallation neutron source(CSNS)accelerator consists of an 80 MeV H-LINAC,a 1.6 GeV rapid cycling synchrotron(RCS)and two beam transport *** uncontrolled beam may permanently damage the components or lead to very high residual radiation dose along the beam *** the equipment protection must be deliberately designed and *** The machine protection system(MPS)protects components from being damaged by the *** response time requirement for the CSNS MPS is less than 20 ms,so the PLC(programmable logic controller)was adopted to implement the interlock *** The MPS was implemented as a two-tier architecture system,and developed through utilizing PLC and Experimental Physics and Industrial Control System(EPICS)software *** application logic was taken into careful consideration during the implementation *** embedded CPU module can function as an IOC accessing PLC I/O modules through the sequence CPU,with an embedded Linux operation *** The interlock logic and heartbeat functions were tested with all functions *** consumption has been measured thoroughly since the important requirement,which is around 15 ms to stop the *** MPS was completed in Sep.2017 and then put into *** has been operating smoothly for more than 3 *** has played an important role in every stage of CSNS’s commissioning and operation and achieved high reliability during the user’s experiment *** accelerator recently runs stably with low equipment failure.

关键词： china spallation neutron source Machine protection system Experimental physics and industrial control system Programmable logic controller