Effect of Finite-Ion-Banana-Width on the Polarization Contribution to the Neoclassical Tearing Modes Evolution

QU Hongpeng (曲洪鹏); PENG Xiaodong (彭晓东); SHEN Yong (沈勇); WANG Aike (王爱科); HAO Guangzhou (郝广周); HU Shilin (胡世林)

doi:10.1088/1009-0630/16/12/02

Plasma Science and Technology > 2014 > 16(12): 1090-1095. > DOI: 10.1088/1009-0630/16/12/02

QU Hongpeng (曲洪鹏), PENG Xiaodong (彭晓东), SHEN Yong (沈勇), WANG Aike (王爱科), HAO Guangzhou (郝广周), HU Shilin (胡世林). Effect of Finite-Ion-Banana-Width on the Polarization Contribution to the Neoclassical Tearing Modes Evolution[J]. Plasma Science and Technology, 2014, 16(12): 1090-1095. DOI: 10.1088/1009-0630/16/12/02

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Effect of Finite-Ion-Banana-Width on the Polarization Contribution to the Neoclassical Tearing Modes Evolution

Southwestern Institute of Physics, Chengdu 610041, China

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2011GB105002, 2014GB107001 and 2014GB124004) and National Natural Science Foundation of China (Nos. 11175057 and 11275061).

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Received Date: March 30, 2014

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Abstract

Abstract

In the previous analytical description of the neoclassical polarization current effect on the neoclassical tearing modes (NTMs), it is usually assumed that the magnetic island is much larger than the finite-ion-banana-width (FBW). This assumption is questionable when the experimentally observed seed island width of the NTMs is comparable to the FBW. We introduce a simple and direct theoretical method to investigate the FBW effect on the neoclassical polarization contribution to the NTM evolution in collisional plasmas. The results show that, the FBW effect can strongly modify the neoclassical polarization current profile near the island separatrix, and thus weaken its probably stabilizing effect on the NTMs.
- NTM,
- neoclassical polarization current,
- ion-banana-orbit-width,
- magnetic island

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References (23)

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