Abstract

Spectra of coherent edge radiation (CER) were observed at the S-band linac facility of Kyoto University Free Electron Laser. A local maximum was observed in the CER spectrum on-crest operation of the radio frequency (RF) field. As the phase of the RF field was shifted from the crest, the frequency of the maximum decreased, and the CER spectrum approached a spectrum of Gaussian-distributed electrons in a bunch. It was found that this strange spectrum can be explained by a model in which a satellite pulse exists around a main pulse in the electron bunch. Furthermore, it demonstrated that CER is an effective tool for monitoring the shape of the electron bunch.

Highlights

  • Coherent radiation emitted by relativistic electrons is used for spectroscopic measurements and imaging experiments as a high-intensity light source [1,2,3] but is an effective tool for evaluating the shape of an electron bunch

  • When a phase of the accelerator tube was shifted from the crest of the radio frequency (RF) field, the maximum moved to the low frequency side, and the spectrum had become similar to that for an electron bunch with Gaussian distribution

  • We discuss the strange Coherent edge radiation (CER) spectrum observed at KU-free-electron laser (FEL) and the satellite wpeudlsisecmusosdtehlefsotrrathnegeelCecEtRrosnpebcutnrucmh sohbaspeer.ved at Kyoto University Free Electron Laser (KU-FEL) and the satellite pulse model for the electron bunch shape

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Summary

Introduction

Coherent radiation emitted by relativistic electrons is used for spectroscopic measurements and imaging experiments as a high-intensity light source [1,2,3] but is an effective tool for evaluating the shape of an electron bunch. When a phase of the accelerator tube was shifted from the crest of the RF field, the maximum moved to the low frequency side, and the spectrum had become similar to that for an electron bunch with Gaussian distribution. It was found that the observed spectrum could be explained when the electron bunch comprised a main pulse and small satellite pulse. We discuss the strange CER spectrum observed at KU-FEL and the satellite wpeudlsisecmusosdtehlefsotrrathnegeelCecEtRrosnpebcutnrucmh sohbaspeer.ved at KU-FEL and the satellite pulse model for the electron bunch shape

Materials and Methods
Observation System for CER Spectrum
Change in the Form Factor for RF Phase
Pseudo-Voigt Distribution
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