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| TUPPH036 |
Optimization of the Injection System for Microtron-Based Terahertz FEL
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403 |
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- G. M. Kazakevich, G. I. Kuznetsov, V. M. Pavlov
BINP SB RAS, Novosibirsk
- Y. U. Jeong, B. C. Lee, S. H. Park
KAERI, Daejon
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A compact widely-tunable microtron-based terahertz Free Electron Laser (FEL) has been developed and during last few years operates for users. The laboratory-size, stable facility, at the macro-pulse power of tens of W is attractive for application in research laboratories and universities. Reliability in operation and stability of such microtron-based FEL is determined generally by the microtron injection system. Main parameters of the injection system were studied on the base of a 2-D tracking considering the frequency drift of the accelerating cavity as a result of variation of the beam loading caused by cathode overheating due to back bombardment with non-resonance electrons. The obtained results show that the injection system based on a thermionic single crystal LaB6 2.5 mm-in diameter emitter provides operation of the microtron-based FEL with standard deviation of the macro-pulse lasing power less than 10% during long-time work. Experimental check of the FEL during more than five years confirmed stable and reliable operation of the microtron-based FEL with the macro-pulse power of tens of W in the terahertz range.
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