FEL induced electron bunch heating observed by a method based on synchronous phase detection

M. Hosaka; S. Koda; M. Katoh; J. Yamazaki; H. Hama

doi:10.1016/S0168-9002(01)01573-X

FEL induced electron bunch heating observed by a method based on synchronous phase detection

M. Hosaka, S. Koda, M. Katoh, J. Yamazaki, H. Hama

Research Center for Electron Photon Science (ELPH)

Research output: Contribution to journal › Conference article › peer-review

4 Citations (Scopus)

Abstract

A new method for monitoring instantaneous bunch length has been developed on the UVSOR storage ring. Based on the bunch length dependence of the loss factor, the bunch length can be derived from the synchronous phase shift. Experiments using this method were performed to observe the bunch lengthening associated with the free electron laser (FEL) power variation. From the detuning dependence of the bunch heating, it was found that additional energy spread mostly has a constant ratio to the intracavity laser power normalized by the beam current. However, at the best synchronism region, the induced energy spread exhibits a strong non-linearity against the normalized FEL power and hence the power saturation is accomplished.

Original language	English
Pages (from-to)	217-221
Number of pages	5
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	475
Issue number	1-3
DOIs	https://doi.org/10.1016/S0168-9002(01)01573-X
Publication status	Published - 2001 Nov 21
Event	22nd International Free Electron Laser Conference (FEL 2000) - Durham, NC, United States Duration: 2000 Aug 13 → 2000 Aug 18

Keywords

Free electron laser
Storage ring

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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10.1016/S0168-9002(01)01573-X

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FEL induced electron bunch heating observed by a method based on synchronous phase detection. / Hosaka, M.; Koda, S.; Katoh, M.; Yamazaki, J.; Hama, H.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 475, No. 1-3, 21.11.2001, p. 217-221.

Research output: Contribution to journal › Conference article › peer-review

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abstract = "A new method for monitoring instantaneous bunch length has been developed on the UVSOR storage ring. Based on the bunch length dependence of the loss factor, the bunch length can be derived from the synchronous phase shift. Experiments using this method were performed to observe the bunch lengthening associated with the free electron laser (FEL) power variation. From the detuning dependence of the bunch heating, it was found that additional energy spread mostly has a constant ratio to the intracavity laser power normalized by the beam current. However, at the best synchronism region, the induced energy spread exhibits a strong non-linearity against the normalized FEL power and hence the power saturation is accomplished.",

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AU - Hosaka, M.

AU - Koda, S.

AU - Katoh, M.

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AU - Hama, H.

PY - 2001/11/21

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N2 - A new method for monitoring instantaneous bunch length has been developed on the UVSOR storage ring. Based on the bunch length dependence of the loss factor, the bunch length can be derived from the synchronous phase shift. Experiments using this method were performed to observe the bunch lengthening associated with the free electron laser (FEL) power variation. From the detuning dependence of the bunch heating, it was found that additional energy spread mostly has a constant ratio to the intracavity laser power normalized by the beam current. However, at the best synchronism region, the induced energy spread exhibits a strong non-linearity against the normalized FEL power and hence the power saturation is accomplished.

AB - A new method for monitoring instantaneous bunch length has been developed on the UVSOR storage ring. Based on the bunch length dependence of the loss factor, the bunch length can be derived from the synchronous phase shift. Experiments using this method were performed to observe the bunch lengthening associated with the free electron laser (FEL) power variation. From the detuning dependence of the bunch heating, it was found that additional energy spread mostly has a constant ratio to the intracavity laser power normalized by the beam current. However, at the best synchronism region, the induced energy spread exhibits a strong non-linearity against the normalized FEL power and hence the power saturation is accomplished.

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