| Paper |
Title |
Page |
| MOPPH046 |
Phase Stability of a Microtron Driving a Terahertz FEL
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79 |
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- G. M. Kazakevich, V. M. Pavlov
BINP SB RAS, Novosibirsk
- Y. U. Jeong, B. C. Lee
KAERI, Daejon
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Phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the beam dynamics in the microtron considering 2-D motion of the electrons in the median plane. This allows the computation of the first harmonic of the current loading the accelerating cavity and the current as well. The time-dependent current has been used to calculate the frequency deviations caused by the incremental loading in the coupled accelerating and magnetron cavities. Further computations using the 2-D simulation show noticeable phase oscillation of the accelerated bunch leaving the microtron on the macro-pulse front. The phase oscillation is in agreement with measured one and affects the lasing in the microtron-based FEL. Optimization of the microtron regimes allows one to minimize the effect. As a result the terahertz microtron-based FEL provides radiated macro-pulse energy up to 0.2 mJ in the range of 100-350 μm with good stability. Results of the simulation and the measurements are presented in this article.
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