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Evaluation of Bunch Length by Measuring Coherent Synchrotron Radiation with a Narrow-Band Detector at LEBRA

1
Laboratory for Electron Beam Research and Application, Nihon University, 7-24-1 Narashinodai, Funabashi 274-8501, Japan
2
Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
*
Author to whom correspondence should be addressed.
Condens. Matter 2020, 5(2), 34; https://doi.org/10.3390/condmat5020034
Received: 7 April 2020 / Revised: 28 April 2020 / Accepted: 7 May 2020 / Published: 9 May 2020
This study presents a novel technology to measure electron bunch length with a high time resolution by measuring coherent synchrotron radiation using a narrow-band detector at Laboratory for Electron Beam Research and Application (LEBRA)—an S-band linear accelerator facility for free-electron lasers. The form factor was observed to decrease exponentially with charge—in concordance with the relationship between the intensity of the coherent synchrotron radiation and the magnitude of electron bunch charge—in the region in which the effect of electron bunch charge on bunch length is negligible. The calculated root-mean-square bunch length was observed to agree well with the value determined from the spectral shape obtained. The aforementioned results are expected to be useful in real-time observation of small changes in electron bunches in advanced accelerators. View Full-Text
Keywords: coherent synchrotron radiation; bunch length; FEL; linac; terahertz coherent synchrotron radiation; bunch length; FEL; linac; terahertz
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Sakai, T.; Hayakawa, K.; Tanaka, T.; Hayakawa, Y.; Nogami, K.; Sei, N. Evaluation of Bunch Length by Measuring Coherent Synchrotron Radiation with a Narrow-Band Detector at LEBRA. Condens. Matter 2020, 5, 34.

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