| Paper | Title | Page |
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| TUPPH049 | Study on Superradiant Smith-Purcell Radiation | 439 |
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| A simulation of coherent and superradiant Smith-Purcell radiation is performed in GHz regime using a three-dimensional particle-in-cell code. The simulation model supposes a rectangular grating to be driven by a single electron bunch,a train of periodic bunches and a continuous beam, respectively. The true Smith-Purcell radiation is distinguished from the evanescent wave, which has an angle independent frequency lower than the minimum allowed Smith-Purcell frequency. We also find that the superradiant radiations excited by periodic bunches are emitted at higher harmonics of the bunching frequency and at the corresponding Smith-Purcell angles. The "start current" is determined as well as the distributions of the radiation intensity are presented. |