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Experimental observations seem to indicate that the beam velocity and energy spreads in gyrotrons are larger than those calculated from electron trajectory codes which doe not take into account the effects of beam instabilities. On the other hand, parasitic oscillations of the beam with frequencies close to the electron cyclotron frequency have been observed experimentally, suggesting the possibility that instabilities can be excited in the beam tunnels and are responsible for the beam degradation. Electrostatic and electromagnetic time dependent particle in cell (PIC) codes have been developed to simulate the beam transport in the beam tunnel. The results of extensive parametric runs, using these codes, together with the role of the beam instabilities around the electron cyclotron frequency on the beam degradation, are reported.

Additional information

Authors: TRAN T M, Ecole Polytechnique Fédérale de Lausanne (CH);JOST G, Ecole Polytechnique Fédérale de Lausanne (CH);APPERT K, Ecole Polytechnique Fédérale de Lausanne (CH);SAUTER O, Ecole Polytechnique Fédérale de Lausanne (CH);WUTHRICH S, CRAY Research, Lausanne (CH)
Bibliographic Reference: Article: Twentieth International Conference on Infrared and Millimeter Waves : Conference Digest (1995) pp. 124-125
Record Number: 199610141 / Last updated on: 1996-03-01
Original language: en
Available languages: en