摘要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.
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.
(Plasma heating by DC fields; ohmic heating, arcs)
引用本文:
GAO Qing-Di;LONG Yong-Xing;DING Xuan-Tong;PAN Yu-Dong;ZHOU Yan;WANG Hao. Establishment of Configuration with Optimized Current Profile in Pellet Fuelled Discharge on HL-2A[J]. 中国物理快报, 2008, 25(2): 628-631.
GAO Qing-Di, LONG Yong-Xing, DING Xuan-Tong, PAN Yu-Dong, ZHOU Yan, WANG Hao. Establishment of Configuration with Optimized Current Profile in Pellet Fuelled Discharge on HL-2A. Chin. Phys. Lett., 2008, 25(2): 628-631.
[1] Gormezano C et al 1998 Phys. Rev. Lett. 805544 [2] Gruber O et al 1999 Phys. Rev. Lett. 83 1787 [3] Luce T C et al 2003 Nucl. Fusion 43 321 [4] Joffrin E et al 2005 Nucl. Fusion 45 626 [5] Wade M R et al 2005 Nucl. Fusion 45 407 [6] Staebler A, et al. 2005 Nucl. Fusion 45 617 [7] Isayama A et al 2001 Nucl. Fusion 41 761 [8] Gao Q D at al 2004 Proc. 20th Int. Conf. on FusionEnergy (Vilamoura, 2004) (Vienna: IAEA) CD-ROM file EX/P4-21http://www-naweb.iaea.org/napc/physics/fec/fec2004\linebreak [4]/datasets/index.html [9] Yuan B S at al 2004 Proc. 20th Int. Conf. on FusionEnergy (Vilamoura, 2004) (Vienna: IAEA) CD-ROM file EX/P5-35http://www-naweb.iaea.org/napc/physics/fec/fec2004\linebreak [4]/datasets/index.html [10] Ding X T et al 2006 Chin. Phys. Lett. 23 2502 [11] Sauter O, Angioni C and Lin-Liu Y R 1999 Phys.Plasmas 6 2834 [12] Gruber O et al 1988 Plasma Phys. Control. Fusion 30 1611 [13] Chang C S and Hinton F L 1986 Phys. Fluids 293314 [14] Lee G S and Diamond P H 1986 Phys. Fluids 293291 [15] Gao Q D, Budny R V, Jiao Y M and Indireshkumar K 2007 Nucl. Fusion 47 1318
2008, Vol. 25 
