Abstract
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.
Highlights
The recent development of compact light sources in the terahertz band has led to the frontier research field of terahertz wave spectroscopy
Several vibration modes exist in the terahertz region characteristic of molecules, and measurement of terahertz wave spectra is widely used to identify materials
At the straight sections of free-electron lasers (FELs), coherent synchrotron radiation (CSR) and coherent edge radiation (CER) have been developed and implemented, and the produced light has been transmitted to laboratories through FEL beamlines
Summary
The recent development of compact light sources in the terahertz band has led to the frontier research field of terahertz wave spectroscopy. Active research and development of terahertz light sources using accelerators have been conducted [3–11]. At Nihon University, various types of terahertz light sources have been developed over the past decade. At the straight sections of FELs, coherent synchrotron radiation (CSR) and coherent edge radiation (CER) have been developed and implemented, and the produced light has been transmitted to laboratories through FEL beamlines. As these terahertz light sources can be used simultaneously with infrared FELs, they are used for experiments including those involving biologic tissue imaging.
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