Characterization of absorber materials for high-power millimetre waves

Author

Wacker, R. ; Leuterer, F. ; Wagner, D. ; Hailer, H. ; Kasparek, W.

Author_Institution

Inst. fur Plasmaforschung, Stuttgart Univ., Germany

fYear

2002

fDate

26-26 Sept. 2002

Firstpage

159

Lastpage

160

Abstract

In electron cyclotron heating systems using gyrotrons with powers up to 1MW, calorimetric loads and absorbers for stray radiation are needed. Furthermore, absorbing coatings are used inside plasma vessels of fusion experiments (e.g. W7-X). For high-power millimetre waves, absorbing coatings on copper or aluminium with optimized properties are required. In this context, measurements of the absorption coefficient of coatings from B/sub 4/C and various mixtures of Al/sub 2/O/sub 3/ and TiO/sub 2/ are presented as a function of thickness, angle of incidence and frequency, and dielectric properties are deduced unambiguously.

Keywords

calorimetry; electromagnetic wave absorption; fusion reactor design; fusion reactor materials; gyrotrons; millimetre wave measurement; millimetre wave tubes; permittivity; plasma arc sprayed coatings; plasma radiofrequency heating; 1 MW; Al/sub 2/O/sub 3/; B/sub 4/C; TiO/sub 2/; absorber materials; absorbing coatings; angle of incidence; calorimetric loads; dielectric properties; electron cyclotron heating systems; fusion experiments; gyrotrons; high-power millimetre waves; plasma vessels; stray radiation; thickness; Coatings; Copper; Cyclotrons; Electrons; Gyrotrons; Heating; Plasma materials processing; Plasma measurements; Plasma properties; Plasma waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on

Conference_Location

San Diego, CA, USA

Print_ISBN

0-7803-7423-1

Type

conf

DOI

10.1109/ICIMW.2002.1076133

Filename

1076133