Second Harmonic Breakdown in KSTAR

Journal Article · Fri Sep 28 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800524· OSTI ID:21035899

Bae, Y S; England, A C; Kwon, M; Lee, G S ^[1]

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1. National Fusion Research Center, 52 Eoeun-dong, Yuseong-gu, Daejeon (Korea, Republic of)

An 84-GHz electron cyclotron heating (ECH) system is being installed on the KSTAR tokamak. KSTAR adopts ECH-assisted start-up for the flexibility and reliability of the KSTAR operation with the plasma breakdown voltage reduced. The available maximum power of the 84 GHz ECH system is presently 500 kW with maximum duration of 2 s. Currently, the second harmonic ECH-assisted start-up is under consideration because a low toroidal field of B{sub T}{approx}1.5 T is desirable for safety and also for the high-beta experiments in the initial operation phase. The studies in this paper are on the effectiveness of the second harmonic breakdown using a 0-D time dependent plasma evolution code and the comparison with the recent DIII-D experimental results on the second harmonic pre-ionization.

• OSTI ID: 21035899
• Journal Information: AIP Conference Proceedings, Vol. 933, Issue 1; Conference: 17. topical conference on radio frequency power in plasmas, Clearwater, FL (United States), 7-9 May 2007; Other Information: DOI: 10.1063/1.2800524; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BREAKDOWN
COMPARATIVE EVALUATIONS
DOUBLET-3 DEVICE
ECR HEATING
ELECTRIC POTENTIAL
FLEXIBILITY
GHZ RANGE
HIGH-BETA PLASMA
IONIZATION
KOREAN ORGANIZATIONS
OPERATION
RF SYSTEMS
START-UP
SUPERCONDUCTING MAGNETS
TIME DEPENDENCE