中国散裂中子源快循环同步加速器壁电流探测系统
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摘要
在中国散裂中子源工程中,快循环同步加速器负责将剥离注入的能量为80MeV的质子束加速至1.6GeV后引出。在快循环同步加速器上共安装了两台壁电流探测器,用来观测束流从注入至引出过程中束团在时域上的变化情况。详细介绍了壁电流探测器在陶瓷间隙、磁性材料和匹配电阻等方面的设计考虑,以达到带宽满足百kHz到30 MHz的设计目标,并对实际带束流测量结果进行分析讨论。经实际在线运行测试,此壁电流探测器完全满足束流调试及运行需要。
Wall current monitors(WCMs)were designed and built for the rapid cycling synchrotron(RCS)of China Spallation Neutron Source(CSNS).The WCMs are used to measure longitudinal bunch shapes in the macro and micro view,calculate longitudinal emittance,and diagnose beam instabilities.The key parameters(e.g.,size of the ceramic gap,selection of the resistor and the magnetic materials)of designing a WCM are discussed in this article.The bandwidth of the RCS-WCM can be up to 500 MHz during the lab test,while 30 MHz is required for online operation.The WCM system performed quite well during the beam commissioning and the normal operation of the RCS,beam injection,macro envelope of the accelerating period,and the shape of a single bunch can be observed clearly and accurately.
Wall current monitors(WCMs)were designed and built for the rapid cycling synchrotron(RCS)of China Spallation Neutron Source(CSNS).The WCMs are used to measure longitudinal bunch shapes in the macro and micro view,calculate longitudinal emittance,and diagnose beam instabilities.The key parameters(e.g.,size of the ceramic gap,selection of the resistor and the magnetic materials)of designing a WCM are discussed in this article.The bandwidth of the RCS-WCM can be up to 500 MHz during the lab test,while 30 MHz is required for online operation.The WCM system performed quite well during the beam commissioning and the normal operation of the RCS,beam injection,macro envelope of the accelerating period,and the shape of a single bunch can be observed clearly and accurately.
引文
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[12] National Instruments Corporation.PXI-5124user manual[DB/OL].http://www.ni.com/pdf/manuals/371135k.pdf.
[2] D’Elia A,Fandos R,Sby L.High bandwidth wall current monitor for CTF3[C]//Proceedings of EPAC08.2008:1092-1094.
[3] Charrondière C,Limpens R,Delrieux M.Wall current monitor using PXI and LabVIEW at CERN[C]//16th International Conference on Accelerator and Large Experimental Control Systems.2017:1699-1702.
[4]王盛昌,王安鑫,徐韬光.用于质子加速器的壁电流探头的研制[J].强激光与粒子束,2012,24(9):2179-2182.(Wang Shengchang,Wang Anxin,Xu Taoguang.Design of wall current monitor for proton accelerators.High Power Laser and Particle Beams,2012,24(9):2179-2182)
[5] Fu Shinian,Chen Hesheng,Chen Yanwei,et al.Status of CSNS project[C]//The 4th International Particle Accelerator Conference.2013:3995-3999.
[6] Wei Jie,Chen Hesheng,Chen Yanwei,et al.China Spallation Neutron Source:Design,R&D,and outlook[J].Nuclear Instruments and Methods in Physics Research,Section A:Accelerators,Spectrometers,Detectors and Associated Equipment,2009,600(1):10-13.
[7] Blokland W.Beam current monitors[R].Albuquerque,New Mexico:USPAS and University of New Mexico,2009.
[8] Denard J C.Beam current monitors[R].Dourdan:CERN Accelerator School on Beam Diagnostics,2008.
[9] Webber R.Longitudinal emittance:An introduction to the concept and survey of measurement techniques including design of a wall current monitor[C]//Conference Proceedings on Accelerator Instrumentation.1989,212:85-126.
[10] Brian F,Jim C.An improved resistive wall monitor[DB/OL].http://www.slac.stanford.edu/pubs/confproc/biw98/fellenz.pdf.
[11] China Amorphous Technology CO.LTD[EB/OL].http://www.catech.cn.
[12] National Instruments Corporation.PXI-5124user manual[DB/OL].http://www.ni.com/pdf/manuals/371135k.pdf.