ECH pre-ionization and assisted startup in the fully superconducting KSTAR tokamak using second harmonic

被引：69

作者：

Bae, Y. S. ^{[1
]}

Jeong, J. H. ^{[2
]}

Park, S. I. ^{[2
]}

Joung, M. ^{[1
]}

Kim, J. H. ^{[1
]}

Hahn, S. H. ^{[1
]}

Yoon, S. W. ^{[1
]}

Yang, H. L. ^{[1
]}

Kim, W. C. ^{[1
]}

Oh, Y. K. ^{[1
]}

England, A. C. ^{[1
]}

Namkung, W. ^{[2
]}

Cho, M. H. ^{[2
]}

Jackson, G. L. ^{[3
]}

Bak, J. S. ^{[1
]}

机构：

[1] Natl Fus Res Inst, Taejon 305333, South Korea

[2] Pohang Univ Sci & Technol, Pohang 790784, South Korea

[3] Gen Atom Co, San Diego, CA 92121 USA

来源：

NUCLEAR FUSION | 2009年 / 49卷 / 02期

关键词：

SYSTEM;

D O I：

10.1088/0029-5515/49/2/022001

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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.

引用

页数：5

共 15 条

[1] Status of KSTAR electron cyclotron heating system [J].