Establishment of Configuration with Optimized Current Profile in Pellet Fuelled Discharge on HL-2A |
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Authors: | GAO Qing-Di LONG Yong-Xing DING Xuan-Tong PAN Yu-Dong ZHOU Yan WANG Hao |
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Institution: | Southwestern Institute of Physics, PO Box 432, Chengdu 610041 |
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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 surfacein 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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