Analysis and Calculation on Electron Bunch Length Measurement by Using CTR

  • Measurement of electron bunch length through its generated CTR is a new frequency domain technique developed in the accelerator and FEL fields recently. In this paper we analyze theoretically and calculate numerically CTR produced by a train of RF-linac electron bunches of a few picoseconds at BFEL. For the CTR emitted at wavelengths longer than the bunch length (λ≥2πσz),the intensity is enhanced by a factor of 108which is the number of electrons in the bunch; CTR energy is mainly concentrated near the beam axis and can be up to several millijoules for Gaussian and rectangular bunches. A polarized-type Michelson interferometer was designed to measure autocorrelation interferograph of CTR, from which one can diagnose longitudinal length of this bunches and derive its electron density distribution.
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LI Zhi-Hui, DAI Jian-Ping, YANG Xue-Ping, FAN Yao-Hui, XIE Jia-Lin and ZHU Jun-Biao. Analysis and Calculation on Electron Bunch Length Measurement by Using CTR[J]. Chinese Physics C, 2003, 27(9): 831-835.
LI Zhi-Hui, DAI Jian-Ping, YANG Xue-Ping, FAN Yao-Hui, XIE Jia-Lin and ZHU Jun-Biao. Analysis and Calculation on Electron Bunch Length Measurement by Using CTR[J]. Chinese Physics C, 2003, 27(9): 831-835. shu
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Received: 2003-01-28
Revised: 1900-01-01
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Analysis and Calculation on Electron Bunch Length Measurement by Using CTR

    Corresponding author: LI Zhi-Hui,
  • Institute of High Energy Physics, CAS, Beijing 100080,China

Abstract: Measurement of electron bunch length through its generated CTR is a new frequency domain technique developed in the accelerator and FEL fields recently. In this paper we analyze theoretically and calculate numerically CTR produced by a train of RF-linac electron bunches of a few picoseconds at BFEL. For the CTR emitted at wavelengths longer than the bunch length (λ≥2πσz),the intensity is enhanced by a factor of 108which is the number of electrons in the bunch; CTR energy is mainly concentrated near the beam axis and can be up to several millijoules for Gaussian and rectangular bunches. A polarized-type Michelson interferometer was designed to measure autocorrelation interferograph of CTR, from which one can diagnose longitudinal length of this bunches and derive its electron density distribution.

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