ICRF boronization - A new technique towards high efficiency wall coating for superconducting tokamak reactors

Citation
Jg. Li et al., ICRF boronization - A new technique towards high efficiency wall coating for superconducting tokamak reactors, NUCL FUSION, 39(8), 1999, pp. 973-977
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR FUSION
ISSN journal
0029-5515 → ACNP
Volume
39
Issue
8
Year of publication
1999
Pages
973 - 977
Database
ISI
SICI code
0029-5515(199908)39:8<973:IB-ANT>2.0.ZU;2-4
Abstract
A new technique for wall conditioning that will be especially useful for fu ture larger superconducting tokamaks, such as ITER, has been successfully d eveloped and encouraging results have been obtained. Solid carborane powder , which is non-toxic and non-explosive, was used. Pulsed RF plasma was prod uced by a non-Faraday shielding RF antenna with RF power of 10 kW. The ion temperature was about 2 keV with a toroidal magnetic field of 1.8 T and a p ressure of 3 x 10(-1) Pa. Energetic ions broke up the carborane molecules, and the resulting boron ions struck and were deposited on the first wall. I n comparison with glow discharge cleaning boronization, the B/C coating fil m shows higher adhesion, more uniformity and longer lifetime during plasma discharges. The plasma performance was improved after ICRF boronization.