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Chinese Physics C> 2003, Vol. 27> Issue(2) : 163-168 

A New Measurement of Electron Beam Emittance with Cerenkov Radiation “Double Imaging” Method

  •  Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

  • A new way in electron beam emittance measurement with Cerenkov radiation "double imaging" method is proposed in this paper. In the standard emittance measurements with optical diagnostics such as Cerenkov radiation, OTR (Optical Transition Radiation), fluorescence screen or BMP (beam profile monitor) etc., the emittance is indirectly calculated through quadrupole-scanning technique, with the prior ssumption that the beam phase space density distribution is ellipse, which will certainly induce systematic error when the beam profile is quite irregular or the space-charge effects can not be omitted. In proposed method, the Cerenkov radiation pass through a 1-meter focal-length thin convex lens, and a CCD camera is used to capture two images of Cerenkov radiation at the focal plane and at the image plane of the lens respectively. Then, with image processing technique, we acquire the angular divergence information of the electron beam from the image of the focal plane and the radial distribution information from the image of the image plane, which we call Cerenkov radiation "double imaging" method. Therefore, the emittance can be directly attained according to the definition of the RMS emittance. By this method, we can measure the actual phase space distributions without making any prior assumptions about the density distributions. Compared with other general measurements, this "double imaging" method has advantages of simpler equipment, higher precision and wider application. This paper also presents the computer simulation results of emittance measurement on the DC-SC (DC-Superconducting) photocathode injector of PKU-SCAF (Peking University Superconducting Accelerator Facility) being built at Peking University.
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    [1] . Pamela Kung,Lihn,Hung-Chi Helmut Wiedemann.Phys.Rev.Lett.,1994,73(7):967—9702. Maruyama X K ,Reighbours J R et al.IEEE Transaction on Nuclear Science,1985,NS 32(5):1994—19963. ZHAO K ,QUAN S W ,LU X Y et al.Research On Peking University Superconducting Accelerator Facility(PKU -SCAF).In:Proc.of the PAC .Chicago,2001,2426—24284. HU YanLe,ZHAO Kui,CHEN JiaEr et al.HEP NP ,2001,25(8):787—792(in Chinese)(胡岩乐,赵夔,陈佳洱等.高能物理与核物理,2001,25(8):787—792)5. ZHAO Kui,HAO JianKui,HU YanLe et al.Nucl.Instr. Meth.In Phys.Res.,2001,A475:564—5686. CAO Zhong,LIU WeiRen,WANG LiLie et al.High Power and Particle Beams,1992,4(4):501—508(in Chinese)(曹忠,刘慰仁,王力列等.强激光与粒子束,1992,4(4):501—508)7. Anderson S G ,Rosenzweig J B ,Lesage G P et al.Phys.Rev.S T Accel. Beams,2002,5:0142018. Richardson R D ,Platt R C ,Crist C E .Particle Accelerator Conference,1993,3:2456—24589. Lapostolle P M .IEEE Trans.Nucl.Sci.,1971,NS 18,110510. Stanley Humphries, Jr. Charged Particle Beams.Beijing:Atomic Energy Press,1999,57(in Chinese)(小斯坦利.汉弗莱斯.带电粒子束.赵夔等译.北京:原子能出版社,1999.57)11. Feldman R B ,Lumpkin A H ,Rule D W et al.Nucl.Instr. Meth.In Phys.Res.,1990,A296:193—198

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GU An-Jia, DING Yuan-Tao, ZHAO Kui, ZHANG Bao-Cheng, QUAN Sheng-Wen, LU Xiang-Yang and CHEN Jia-Er. A New Measurement of Electron Beam Emittance with Cerenkov Radiation “Double Imaging” Method[J]. Chinese Physics C, 2003, 27(2): 163-168.
GU An-Jia, DING Yuan-Tao, ZHAO Kui, ZHANG Bao-Cheng, QUAN Sheng-Wen, LU Xiang-Yang and CHEN Jia-Er. A New Measurement of Electron Beam Emittance with Cerenkov Radiation “Double Imaging” Method[J]. Chinese Physics C, 2003, 27(2): 163-168. shu
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Received: 2002-03-25
Revised: 1900-01-01
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A New Measurement of Electron Beam Emittance with Cerenkov Radiation “Double Imaging” Method

    Corresponding author: GU An-Jia,
  • Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
  • Received Date: 2002-03-25
  • Accepted Date: 1900-01-01
  • Available Online: 2003-02-05

Abstract: A new way in electron beam emittance measurement with Cerenkov radiation "double imaging" method is proposed in this paper. In the standard emittance measurements with optical diagnostics such as Cerenkov radiation, OTR (Optical Transition Radiation), fluorescence screen or BMP (beam profile monitor) etc., the emittance is indirectly calculated through quadrupole-scanning technique, with the prior ssumption that the beam phase space density distribution is ellipse, which will certainly induce systematic error when the beam profile is quite irregular or the space-charge effects can not be omitted. In proposed method, the Cerenkov radiation pass through a 1-meter focal-length thin convex lens, and a CCD camera is used to capture two images of Cerenkov radiation at the focal plane and at the image plane of the lens respectively. Then, with image processing technique, we acquire the angular divergence information of the electron beam from the image of the focal plane and the radial distribution information from the image of the image plane, which we call Cerenkov radiation "double imaging" method. Therefore, the emittance can be directly attained according to the definition of the RMS emittance. By this method, we can measure the actual phase space distributions without making any prior assumptions about the density distributions. Compared with other general measurements, this "double imaging" method has advantages of simpler equipment, higher precision and wider application. This paper also presents the computer simulation results of emittance measurement on the DC-SC (DC-Superconducting) photocathode injector of PKU-SCAF (Peking University Superconducting Accelerator Facility) being built at Peking University.

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