A terahertz free electron laser (FEL) driven by a high-current classical -band 12-orbit microtron with internal injection and a magnetron-based radio frequency system has been developed. The laboratory-size, inexpensive facility is widely tunable in the terahertz range. This makes it attractive for application in research laboratories and universities. Stability and reliability in operation of such microtron-based FEL is determined generally by the microtron injection system. Operation of the injection system employing a thermionic cathode has been analyzed. The analysis was performed using two-dimensional tracking simulations in which we considered bombardment of the cathode emitting surface with the back-streaming electrons. The analysis showed that the bombardment causes pulse overheating of the emitting surface and, as a result, an increase of beam loading of the accelerating cavity during the macropulse. The phenomenon affects the intrapulse stability of the accelerated current and the FEL operation. The analysis and measurements show how to optimize the microtron operation minimizing affects of the back-streaming electrons. The developed injection system based on thermionic cathode provides operation of the widely tunable terahertz FEL in the ordinary regime with radiated macropulse power of at the pulse duration of . The standard deviation of the lasing macropulse energy is less than 10% for long-time operation.
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1 August 2007
Research Article|
August 09 2007
Internal injection for a microtron driving a terahertz free electron laser
Grigory M. Kazakevich;
Grigory M. Kazakevich
a)
Budker Institute of Nuclear Physics RAS
, Academician Lavrentyev 11, Novosibirsk 630090, Russia
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Viatcheslav M. Pavlov;
Viatcheslav M. Pavlov
b)
Budker Institute of Nuclear Physics RAS
, Academician Lavrentyev 11, Novosibirsk 630090, Russia
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Gennady I. Kuznetsov;
Gennady I. Kuznetsov
Budker Institute of Nuclear Physics RAS
, Academician Lavrentyev 11, Novosibirsk 630090, Russia
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Young Uk Jeong;
Young Uk Jeong
Korea Atomic Enrgy Research Institute
, P.O. Box 105, Yusong, Taejon 305-600, South Korea
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Seong Hee Park;
Seong Hee Park
Korea Atomic Enrgy Research Institute
, P.O. Box 105, Yusong, Taejon 305-600, South Korea
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Byung Cheol Lee
Byung Cheol Lee
Korea Atomic Enrgy Research Institute
, P.O. Box 105, Yusong, Taejon 305-600, South Korea
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Grigory M. Kazakevich
a)
Viatcheslav M. Pavlov
b)
Gennady I. Kuznetsov
Young Uk Jeong
Seong Hee Park
Byung Cheol Lee
Budker Institute of Nuclear Physics RAS
, Academician Lavrentyev 11, Novosibirsk 630090, Russiaa)
Present address: Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510; electronic mail: [email protected] and [email protected]
b)
Present address: Dept. of Physics, University of Stratchclyde, The John Anderson Building 107, Glasgow, G4 0NG, UK.
J. Appl. Phys. 102, 034507 (2007)
Article history
Received:
March 20 2007
Accepted:
June 21 2007
Citation
Grigory M. Kazakevich, Viatcheslav M. Pavlov, Gennady I. Kuznetsov, Young Uk Jeong, Seong Hee Park, Byung Cheol Lee; Internal injection for a microtron driving a terahertz free electron laser. J. Appl. Phys. 1 August 2007; 102 (3): 034507. https://doi.org/10.1063/1.2767250
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