S. Kashiwagi, M. Washio (Waseda Univ.), X.J. Wang, I. Ben-Zvi, R. Malone, V. Yakimenko (BNL)
The longitudinal phase space distribution of electron beam plays critical role in ultra-short electron bunch production, coherent radiation, free electron laser and many other applications. Photocathode RF gun not only capable of controlling the transverse emittance of electron beam, but also longitudinal emittance. The longitudinal phase space distribution of photoelectron beam is investigated at the Brookhaven Accelerating Test Facility (BNL-ATF) using tomography technique . The longitudinal phase space distribution is reconstructed by measuring the energy spectrums of the beam for different RF phases. We will first briefly describe the principle of tomography technique and the ATF experiment setup, the preliminary results of longitudinal emittance as function of RF gun phase and space charge will be presented.
 K.N. Ricci et al.,'Sub-picosecond Electron Bunch Profile Measurement Using Magnetic Longitudinal Dispersion and Off-phase RF Acceleration' Advanced Accelerator Concepts Workshop 1998, 735-744
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