Reflections
in Gyrotrons with Radial Output: Consequences for the ITER Coaxial Gyrotron
O. Dumbrajs,1,2 G. S. Nusinovich,3
and B. Piosczyk1
1Forschungszentrum
Karlsruhe, Institut für Hochleistungsimpuls-und Mikrowellentechnik,
Association
Euratom – FZK, Hermann –von - Helmholtz-Platz 1, D-76344 Eggenstein -
Leopoldshafen, Germany. E-mail: bernhard.piosczyk@ihm.fzk.de
2Department of
Engineering Physics and Mathematics, Helsinki University of Technology, Association
Euratom - Tekes, P.O.Box 2200, FIN-02015 HUT, Finland. E-mail:
olgierd.dumbrajs@hut.fi
A theory
describing the influence of reflections on operation of gyrotrons with radial
output is presented. The theory is used for evaluating the effect of
reflections on the operation of the 170 GHz ITER coaxial cavity gyrotron. It is
shown that for optimally chosen external magnetic field value and electron beam
radius, possible reflections do not change the final steady-state operation,
which corresponds to generation of a 2.2 MW power.