| Paper | Title | Page |
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| MOPPH041 | Development of THz Light Source Using Pre-Bunched FEL | 71 |
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| A project of pre-bunched FEL as a Terahertz (THz) light source using short electron bunch less than 100 fs has been progressed at Laboratory of Nuclear Science, Tohoku University. We expect that FEL with shorter electron beam (comparing with FEL wavelength) may generate shorter light pulse than conventional FEL with longer electron beam. By choosing an appropriate initial electron phase, the FEL gain will be higher. Since seed light of coherent synchrotron radiation is added in each round trip, the FEL will be saturated quickly so that long macro pulse won’t be required. In order to produce very short electron bunch around 100 fs, we have been developing an independently-tunable-cells (ITC) RF gun with a small thermionic cathode and a bunch compressor employing α magnet. We have made a numerical simulation code based on 1-D FEL equations. This code can calculate interaction between short the electron bunch and the FEL field. We will report on characteristics such as a time structure and spectrum of pre-bunched FEL resulted from the simulations. |