Study of Inverted Sawtooth Activities in EAST Plasma

CHEN Yebin(陈晔斌); HU Liqun(胡立群); CHEN Kaiyun(陈开云); LI Miaohui(李妙辉)

doi:10.1088/1009-0630/16/3/03

Plasma Science and Technology > 2014 > 16(3): 188-192. > DOI: 10.1088/1009-0630/16/3/03

CHEN Yebin(陈晔斌), HU Liqun(胡立群), CHEN Kaiyun(陈开云), LI Miaohui(李妙辉). Study of Inverted Sawtooth Activities in EAST Plasma[J]. Plasma Science and Technology, 2014, 16(3): 188-192. DOI: 10.1088/1009-0630/16/3/03

Citation:

PDF (7255 KB)

Study of Inverted Sawtooth Activities in EAST Plasma

1 University of Science and Technology of China, Hefei 230031, China 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by National Natural Science Foundation of China (No.11205197) and the National Magnetic Confinement Fusion Science Program of China (No.2010GB106004)

More Information

Received Date: August 29, 2012

Graphical Abstract

Abstract

Abstract

On the EAST tokamak, during whole off-axis LHCD (low hybrid current drive) limiter discharge, inverted sawteeth oscillations on the SXR (soft X-ray camera) signals appear continuously, and no positive sawtooth is observed. It is thought that this phenomenon is caused by the curvature pinch, though it could partly be explained by the electron temperature profile observed on the PHA (soft X-ray pulse height analyzer) system. The off-axis LHCD and Ohmic heating generate a non-monotonic q profile. According to the curvature pinch effect, this q profile leads to a special electron density profile that has a valley ring. The non-monotonic q profile and the special electron density profile lead to this interesting phenomenon.
- soft X-ray camera,
- inverted sawtooth,
- LHCD

FullText(HTML)

References (9)

References

1 Von Goeler S, Stodiek W and Sauthoff N. 1974, Phys.Rev. Lett., 33: 1201;

2 Kim S B. 1986, Nuclear Fusion, 26: 1251;

3 Pfeiffer W. 1985, Double Sawteeth Oscillations in the Doublet III tokamak. General Atomic Co., San Diego,CA, Report, GA-A-16994(1985), p.673;

4 Furno I, Weisen H and TCV team. 2003, Phys. Plas-mas, 10: 2422;

5 Deng Wei, Liu Yi, et al. 2007, Plasma Science and Technology, 9: 411;

6 Dudok de Wit T, et al. 1994, Phys. Plasmas, 1: 3288;

7 Peysson Y, Decker J. 2008, C3PO, a ray-tracing code for arbitrary axisymmetric magnetic equilibrium. Re-port EUR-CEA-FC-1739, Euratom-CEA;

8 Decker J, Peysson Y. 2004, DKE: a fast numerical solver for the 3-D relativistic bounce-averaged electron Drift Kinetic Equation. Technical Report EUR-CEA-FC-1736, EURATOM CEA-Cadarache;

9 Baker D R and Rosenbluth M N. 1998, Phys. Plasmas,5: 2936

Cited By