MOOS02 　加速器技術（診断／制御１）　 8月5日 シンポジオン会議室 10:30 - 10:50

Study of Longitudinal Phase Space Distribution Measurement via a Linear Focal Cherenkov Ring Camera

○Anusorn Lueangaramwong (Electron Light Science Centre, Tohoku University)

At Tohoku University, a study of generation of intense coherent THz radiation from sub-picosecond electron bunches has been developing. Initial electron distribution in the longitudinal phase space produced by an electron gun is crucial for extreme short electron bunch production. For relatively lower energy electrons, a novel method for measurement of electron kinetic energy employing velocity dependence of the opening angle of Cherenkov radiation was proposed. Combined use of a streak camera and a “turtle-back” mirror that confines the Cherenkov light on to a linear focal line may allow us to observe the longitudinal phase space distribution directly. An experimental setup was examined with numerical ray tracing, and a radiator placed outside the vacuum chamber was designed to achieve the highest energy resolution. To extract the electron beam from the vacuum, a beryllium thin film was proposed as a beam window. However, a Geant4 Monte Carlo simulation showed that multiple scatterings of the electron beam in the beryllium window significantly affects the resolution of the Cherenkov angle. Detail of examination will be presented in this conference.