Electrooptical Measurements of Ultrashort 45 MeV Electron Beam Bunches
T. Tsang, V. Castillo, L. Kowalski, R. Larsen, D. M. Lazarus, D. Nikas, C. Ozben, Y. K. Semertzidis, T. Srinivasan-Rao
Abstract
We have measured the temporal duration of 45 MeV picosecond electron beam bunches using a noninvasive electro-optical (EO) technique. The amplitude of the EO modulation was found to increase linearly with electron beam charge and decrease inversely with distance from the electron beam. The risetime of the temporal signal was limited by our detection system to ~70ps. The EO signal due to ionization caused by the electrons traversing the EO crystal was also observed. It has a distinctively long decay time constant and signal polarity opposite to that due to the field induced by the electron beam. The electro-optical technique may be ideal for the measurement of bunch length of femtosecond, relativistic, high energy, charged, particle beams.
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