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ECH PRE-IONIZATION AND ASSISTED STARTUP IN THE FULLY SUPERCONDUCTING KSTAR TOKAMAK USING SECOND HARMONIC

Title
ECH PRE-IONIZATION AND ASSISTED STARTUP IN THE FULLY SUPERCONDUCTING KSTAR TOKAMAK USING SECOND HARMONIC
Authors
Bae, YSJeong, JHPark, SIJoung, MKim, JHHahn, SHYoon, SWYang, HLKim, WCOh, YKEngl, ACNamkung, WCho, MHJackson, GLBak, JS
POSTECH Authors
Namkung, W
Date Issued
Feb-2009
Publisher
INT ATOMIC ENERGY AGENCY
Abstract
This letter reports on the successful demonstration of the second harmonic electron cyclotron heating (ECH)-assisted startup in the first plasma experiments recently completed in the fully superconducting Korea Superconducting Tokamak Advanced Research (KSTAR) device whose major and minor radii are 1.8m and 0.5 m, respectively. For the second harmonic ECH-assisted startup, an 84 GHz EC wave at 0.35 MW was launched before the onset of the toroidal electric field of the Ohmic system. And it was observed that this was sufficient to achieve breakdown in the ECH pre-ionization phase, allow burn-through and sustain the plasma during the current ramp with a low loop voltage of 2.0 V and a corresponding toroidal electric field of 0.24 V m(-1) at the innermost vacuum vessel wall (R = 1.3 m). This is a lower value than 0.3 Vm(-1) which is the maximum electric field in ITER. Due to the limited volt-seconds and the loop voltage of the Ohmic power system, the extended pulse duration of the ECH power up to 180 ms allowed the plasma current to rise up to more than 100 kA with a ramp-up rate of 0.8 MAs(-1).
URI
http://oasis.postech.ac.kr/handle/2014.oak/26157
DOI
10.1088/0029-5515/49
ISSN
0029-5515
Article Type
Article
Citation
NUCLEAR FUSION, vol. 49, no. 2, page. 22001 - 22001, 2009-02
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 CHO, MOO HYUN
Div. of Advanced Nuclear Enginrg
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