Analysis and Calculation on Electron Bunch Length Measurement by Using CTR

LI Zhi-Hui; DAI Jian-Ping; YANG Xue-Ping; FAN Yao-Hui; XIE Jia-Lin; ZHU Jun-Biao

Chinese Physics C> 2003, Vol. 27> Issue(9) : 831-835

Analysis and Calculation on Electron Bunch Length Measurement by Using CTR

Institute of High Energy Physics, CAS, Beijing 100080,China

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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.

References

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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.

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Received: 2003-01-28
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2003-01-28
Accepted Date: 1900-01-01
Available Online: 2003-09-05

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.