Design of Cavities for a Short Pulse Powerful Large Orbit Gyrotron |
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| Authors: | La Agusu T Idehara M Kamada T Hayashi V N Manuilov O Dumbrajs K Yatsui and W Jiang |
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| Institution: | (1) Research Center for Development of Far-Infrared Region, University of Fukui, Bunkyo 3-9-1, Fukui 910-8507, Japan;(2) Radiophysical Department of Nizhny, Novgorod State University, 650005, Gagarin av., 23, Nizhny Novgorod, Russia;(3) Association Euratom-Tekes Finland, Helsinki University of Technology, FIN-02015 Hut, Finland;(4) Extremely High-Energy Density Research Institute Nagaoka, University of Technology Nagaoka, Niigata 940-2188, Japan |
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| Abstract: | Designs of cavities for fundamental and high harmonic operation in Large Orbit Gyrotron (LOG) are discussed. The fundamental operation allows one to use beam currents in the range from 200 A to 300 A achieve output power of the order of 9–10 MW at frequency 143.6 GHz. Mode competition calculations show that stable oscillations in the TE1,4 mode using high beam currents are possible even with the pitch factor 1.3 which is significantly lower than the design value 1.55. For the second harmonic operation, the maximum current used for excitation of the TE2,4 mode is 60 A and the optimum magnetic field is 7.6 T. A cavity design for fourth harmonic operation using the TE4,4 mode is also presented. |
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| Keywords: | Cavity Large orbit gyrotron mode competition harmonic operation |
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