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Chinese Physics C> 2005, Vol. 29> Issue(2) : 191-196 

Time-Resolved Emittance Measurement of Intense Pulse Beams Using the Modified Three Gradient Method

  •  Department of Engineering Physics,Tsinghua University,Beijing 100084,China2 Institute of Fluid Physics,CAEP,Mianyang 621900,China

  • The three gradient method is a conventional means for beam emittance measurement. In intense electron beam accelerators,since the space charge effect is remarkable, the conventional three gradient method in not available.A MTGM(abbreviation for the Modified Three Gradient Method)is an improvement of the conventional three gradient method, the space charge effect is included in this method. In this paper, the basic theory of MTGM is stated, the principle of applying the MTGM method to beam diagnostics is described. Experiments are carried out on two electron beams of 3.5MeV, 2.6kA, 100ns and 18MeV,2.6kA 100ns separately, which scheme is presented. Results of these experiments are presented together with the error analysis. The results show that the MTGM method is an effective way of emittance measurement for intense pulse electron beam.
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    [1] . HUI Z X, YANG Z H. Free Electron Laser. National Defence Industry Press , 1995. 12. (in Chinese)(惠钟锡,杨震华. 自由电子激光. 国防工业出版社,1995. 12)2.　WANG S H , YE Q , CAO J S et al . HEP NP , 2002 , 26 : 1184 —1188 (in Chinese)(王书鸿,叶强,曹建社等. 高能物理与核物理,2002 ,26 :1184 —1188)3.　Bardy J , Bonnafond C et al . Status of AIRIX Alignment and High Current Electron Beam Diagnostics. Proceeding of EPAC964.　Richard B R , Ekdahl C et al . Beam Emittance Diagnostic for theDARHT Second Axis Injector. Proceeding of Pulsed Power Conference ,20015.　Marghitu S , Oproiu C et al . Pulsed Electron Source Characterization with the Modified Three Gradient Method. Proceeding of International Conference on Accelerator and Large Experimental Physics Control Systems , 20016.　DAI Z Y. Research of the Increase Mechanism and Decrease Means for Beam Emittance of the Linear Induction Accelerator. Doctor Dissertation. Beijing : China Academy of Science , 2004 (in Chinese)(代志勇. 直线感应加速器束流发射度增长与抑制研究. 中国科学院研究生院博士学位论文,2004)7.　GUAN Z, CHEN J L. Numerical Computational Methods. Tsinghua University Press , 1990. 8 (in Chinese)(关治,陈景良. 数值计算方法. 清华大学出版社,1990. 8)

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YANG Guo-Jun, ZHANG Zhuo, CHEN Si-Fu, LIU Cheng-Jun and LIN Yu-Zheng. Time-Resolved Emittance Measurement of Intense Pulse Beams Using the Modified Three Gradient Method[J]. Chinese Physics C, 2005, 29(2): 191-196.
YANG Guo-Jun, ZHANG Zhuo, CHEN Si-Fu, LIU Cheng-Jun and LIN Yu-Zheng. Time-Resolved Emittance Measurement of Intense Pulse Beams Using the Modified Three Gradient Method[J]. Chinese Physics C, 2005, 29(2): 191-196. shu
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Received: 2004-06-16
Revised: 2004-07-26
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Time-Resolved Emittance Measurement of Intense Pulse Beams Using the Modified Three Gradient Method

    Corresponding author: YANG Guo-Jun,
  • Department of Engineering Physics,Tsinghua University,Beijing 100084,China2 Institute of Fluid Physics,CAEP,Mianyang 621900,China
  • Received Date: 2004-06-16
  • Accepted Date: 2004-07-26
  • Available Online: 2005-02-05

Abstract: The three gradient method is a conventional means for beam emittance measurement. In intense electron beam accelerators,since the space charge effect is remarkable, the conventional three gradient method in not available.A MTGM(abbreviation for the Modified Three Gradient Method)is an improvement of the conventional three gradient method, the space charge effect is included in this method. In this paper, the basic theory of MTGM is stated, the principle of applying the MTGM method to beam diagnostics is described. Experiments are carried out on two electron beams of 3.5MeV, 2.6kA, 100ns and 18MeV,2.6kA 100ns separately, which scheme is presented. Results of these experiments are presented together with the error analysis. The results show that the MTGM method is an effective way of emittance measurement for intense pulse electron beam.

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