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(EXP5/12) Pellet Injection during RF Heating on HT-7 Tokamak

Y. Yang¹⁾, Y. Zhao¹⁾, X. Gao¹⁾, C. Y. Xia¹⁾, J. Li¹⁾, B. N. Wan¹⁾, J. R. Luo¹⁾, X. M. Gu¹⁾, L. Q. Hu¹⁾, S. Y. Zhang¹⁾, Y. X. Jie¹⁾, J. K. Liu¹⁾, X. D. Tong¹⁾, Y. F. Chen¹⁾ and HT-7 Team
 
¹⁾ Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), Hefei, P. R. China

Abstract.  One of the main focuses of the plasma research on the HT-7 superconducting tokamak is the exploration of advanced steady-state operation. RF heating and pellet injection experiments are carried out. D and H pellet injection has been utilized successfully for extending the operational density and modification of plasma parameters. Effective heating has also been observed in the 1999 and 2000 experimental campaigns. Recently, experiments on HT-7 illustrate a good effect on the off-axis RF heating by H and D pellet injection. The heating effect is observed clearly, the reason for which may lie in the steep electron pressure gradient created by the pellet injection. Combined with the steep local n_e gradient, good off-axis heating could provide another condition for profile and local transport studies. In addition, shortly after the injection of the pellet, the coupling efficiency of the wave is enhanced and confinement is improved. In the paper, the experiments are introduced and discussed.

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