Dielectric window for reactor like ICRF vacuum transmission line

The dielectric window of a 35–60 MHz ion cyclotron resonance frequency (ICRF) transmission line is designed for reactor conditions in due consideration of irradiation, dielectric heating, fabrication issues, and remote handling. Electric field, temperature distribution, and thermal stresses are eval...

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Veröffentlicht in:	Fusion engineering and design 2001-09, Vol.55 (4), p.419-436
Hauptverfasser:	Heikinheimo, L, Heikkinen, J.A, Lindén, J, Kaye, A, Orivuori, S, Saarelma, S, Tähtinen, S, Walton, R, Wasastjerna, F
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Controled nuclear fusion plants Cyclotron resonance Diagnostics Dielectric materials Dielectric window Electric field effects Electric impedance Electric lines Energy Energy. Thermal use of fuels Exact sciences and technology Fillers Heat conduction Installations for energy generation and conversion: thermal and electrical energy Thermal stress Vacuum brazing Vacuum transmission line
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Beschreibung
Zusammenfassung:	The dielectric window of a 35–60 MHz ion cyclotron resonance frequency (ICRF) transmission line is designed for reactor conditions in due consideration of irradiation, dielectric heating, fabrication issues, and remote handling. Electric field, temperature distribution, and thermal stresses are evaluated for beryllia and alumina dielectrics using finite element codes. The analysis is made for two annular ceramic septa joining coaxial water-cooled conductors having maximum operating 50 kV peak rf voltage and 30 Ω characteristic impedance. For unfavourable irradiation conditions (>10 23 n/m 2 neutron fluence), alumina is found to be heated excessively to about 1000 °C with unacceptable stresses. For moderately irradiated beryllia (
ISSN:	0920-3796 1873-7196
DOI:	10.1016/S0920-3796(01)00216-2