Experimental and technical requirements for a 2 MW, CW coaxial cavity gyrotron

B. Piosczyk, A. Arnold1, H. Budig, G. Dammertz, O. Dumbrajs2, O. Drumm1,

M.V. Kartikeyan, M. Kuntze, M. Thumm1 and X. Yang

Forschungszentrum Karlsruhe, Association EURATOM-FZK,

Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), D-76021 Karlsruhe, Germany

1 also Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik (IHE)

2Department of Engineering Physics and Mathematics, Helsinki University of Technology,

Association EURATOM TEKES, FIN-02150 Espoo, Finland.

e-mail: bernhard.piosczyk@ihm.fzk.de

 

 

Abstract

 

The recently performed experiments on a 165 GHz, coaxial cavity gyrotron completed the data basis necessary for manufacturing of an industrial 2 MW, CW tube. In particular, (1) the influence of misalignment of the coaxial insert on the losses has been investigated, (2) the amount of microwave radiation captured in the mirror box has been measured with improved accuracy, (3) measurements of the hysteresis effect due to variation of the beam voltage have been performed and (4) a strong increase of the current to the insert Iins has been observed limiting the maximum pulse to about 17 ms. It has been found that the increase of Iins is caused by a kind of a Penning discharge in the technical part of the electron gun. This can be avoided by a proper design. The results will be presented and discussed.

 

 

als Vortrag:

27th Int.Conf. on Infrared and Millimeter Waves, Sept.. 22-26, 2002, San Diego, USA