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Initial phase wall conditioning in KSTAR

Title
Initial phase wall conditioning in KSTAR
Author
정규선
Issue Date
2011-10
Publisher
INT ATOMIC ENERGY AGENCY, WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA
Citation
NUCLEAR FUSION , 51, 10, 103027
Abstract
The initial phase wall conditioning in KSTAR is depicted. The KSTAR wall conditioning procedure consists of vessel baking, glow discharge cleaning (GDC), ICRH wall conditioning (ICWC) and boronization (Bz). Vessel baking is performed for the initial vacuum conditioning in order to remove various kinds of impurities including H(2)O, carbon and oxygen and for the plasma operation. The total outgassing rates after vessel baking in three successive KSTAR campaigns are compared. GDC is regularly performed as a standard wall cleaning procedure. Another cleaning technique is ICWC, which is useful for inter-shot wall conditioning under a strong magnetic field. In order to optimize the operation time and removal efficiency of ICWC, a parameter scan is performed. Bz is a standard technique to remove oxygen impurity from a vacuum vessel. KSTAR has used carborane powder which is a non-toxic boron-containing material. The KSTAR Bz has been successfully performed through two campaigns: water and oxygen levels in the vacuum vessel are reduced significantly. As a result, KSTAR has achieved its first L-H mode transition, although the input power was marginal for the L-H transition threshold. The characteristics of boron-containing thin films deposited for boronization are investigated.
URI
http://iopscience.iop.org/article/10.1088/0029-5515/51/10/103027/metahttp://hdl.handle.net/20.500.11754/40111
ISSN
0029-5515
DOI
10.1088/0029-5515/51/10/103027
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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