| Original Articles |
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Establishment of Configuration with Optimized Current Profile in Pellet Fuelled Discharge on HL-2A |
| GAO Qing-Di;LONG Yong-Xing;DING Xuan-Tong;PAN Yu-Dong;ZHOU Yan;WANG Hao |
| Southwestern Institute of Physics, PO Box 432, Chengdu 610041 |
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| Cite this article: |
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GAO Qing-Di, LONG Yong-Xing, DING Xuan-Tong et al 2008 Chin. Phys. Lett. 25 628-631 |
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Abstract A sawtooth-free period is produced following the pellet injection in the pellet fuelled discharge of qa=3.4 (where qa is the safety factor at the plasma boundary) in the HL-2A tokamak. Establishment of the current profile such as in the hybrid scenario is studied under the condition of pellet injection in HL-2A. It is shown that a q-profile of weak negative shear is produced immediately after the pellet injection, and it then evolves to a broad flat profile with q0>1 (where q0 is the safety factor at the centre). The measured MHD mode structures evidence consistencies of the evaluated q-profile with locations of the q=1 surface in the sawtoothing period and of the q=2 surface
in the sawtooth-free period. TRANSP analysis indicates that the energy confinement is enhanced substantially during and after pellet injection, which is resulted from the q-profile optimization and the plasma density peaking.
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| Keywords:
52.55.Fa
52.50.Nr
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Received: 25 July 2007
Published: 30 January 2008
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| PACS: |
52.55.Fa
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(Tokamaks, spherical tokamaks)
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52.50.Nr
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(Plasma heating by DC fields; ohmic heating, arcs)
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