Investigation of Some MHD Events in the SUNIST Spherical Tokamak

ZENG Long; GAO Zhe; TAN Yi; WANG Wenhao; XIE Huiqiao; XIE Lifeng; FENG Chunhua

Plasma Science and Technology > 2011 > 13(4): 420-423.

ZENG Long, GAO Zhe, TAN Yi, WANG Wenhao, XIE Huiqiao, XIE Lifeng, FENG Chunhua. Investigation of Some MHD Events in the SUNIST Spherical Tokamak[J]. Plasma Science and Technology, 2011, 13(4): 420-423.

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Investigation of Some MHD Events in the SUNIST Spherical Tokamak

1) Department of Engineering Physics, Tsinghua University, Beijing100084, China 2) Institute of Plasma Physics, Chinese Academy of Sciences, Hefei230031, China 3) Institute of Physics, Chinese Academic of Science, Beijing100190, China 4) College of Physics, Donghua University, Shanghai200051, China

Funds: supported by National Natural Science Foundation of China (Nos. 10405014, 10990214), MOST of China, under Contract Nos. 2009GB105002 and 2008GB717804, also in part by the JSPS-CAS Core-University program in the field of ‘Plasma and Nuclear Fusion’.

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Received Date: December 09, 2010

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Abstract

Abstract

Internal reconnection event (IRE), which is characterized by a perturbation in plasma current Ip, loop voltage Vloop, Hα radiation and magnetic perturbation dBp, was observed in the SUNIST experiment. It is found that, the fluctuation before IREs is characterized by a structure of m =2 / n =1, then changes to m =4 / n =1 during the IREs; and, after IREs, the mode number changes to m =3 / n =1. An analysis in the evolution of equilibrium parameters during IREs shows that a positive spike appears in the evolution of the plasma’s elongation and a negative spike in the poloidal beta of plasma. A collapse in the pressure profile, corresponding to the occurrence of IREs, is also found.
- IREs,
- SUNIST,
- singular value decomposition,
- poloidal mode

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