Study of impurity transport in HL-2A ECRH L-mode plasmas with radially different ECRH power depositions

被引：23

作者：

Cui, Z. Y. ^{[1
]}

Zhang, K. ^{[1
]}

Morita, S. ^{[2
]}

Ji, X. Q. ^{[1
]}

Ding, X. T. ^{[1
]}

Xu, Y. ^{[3
]}

Sun, P. ^{[1
]}

Gao, J. M. ^{[1
]}

Dong, C. F. ^{[1
]}

Zheng, D. L. ^{[1
]}

Li, Y. G. ^{[1
]}

Jiang, M. ^{[1
]}

Li, D. ^{[1
]}

Zhong, W. L. ^{[1
]}

Liu, Yi ^{[1
]}

Dong, Y. B. ^{[1
]}

Song, S. D. ^{[1
]}

Yu, L. M. ^{[1
]}

Shi, Z. B. ^{[1
]}

Fu, B. Z. ^{[1
]}

Lu, P. ^{[1
]}

Huang, M. ^{[1
]}

Yuan, B. S. ^{[1
]}

Yang, Q. W. ^{[1
]}

Duan, X. R. ^{[1
]}

机构：

[1] Southwestern Inst Phys, POB 432, Chengdu 610041, Sichuan, Peoples R China

[2] Natl Inst Fus Sci, Toki, Gifu 5095292, Japan

[3] Southwest Jiaotong Univ, Inst Fus Sci, Chengdu 610031, Sichuan, Peoples R China

来源：

NUCLEAR FUSION | 2018年 / 58卷 / 05期

基金：

中国国家自然科学基金;

关键词：

impurity transport; LBO; numerical simulation; ECRH; MHD instability; ASDEX UPGRADE; H-MODE; TCV; CONFINEMENT; DISCHARGES; SAWTOOTH; PARTICLE; TOKAMAK; CORE;

D O I：

10.1088/1741-4326/aab166

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In HL-2A, an inverse sawtooth oscillation is observed with a long-lasting m/n = 1/1 mode during ECRH phase with power deposition inside sawtooth inversion radius (inner-deposited ECRH), while a normal sawtooth instead appears when the ECRH power is deposited outside sawtooth inversion radius (outer-deposited ECRH). Aluminum is then injected as a trace impurity with laser blow-off (LBO) method into the inner-and outer-deposited ECRH phases of HL-2A discharges to investigate the effect of ECRH on impurity transport. Temporal behavior of soft x-ray (SXR) array signals is analyzed with a 1D impurity transport code, and radial structures of impurity transport coefficients are obtained. The result shows that the radial transport of Al ions is strongly enhanced during the inner-deposited ECRH phase. In particular, an outward convection velocity is developed with positive values of 0 <= V(rho) <= 3.8 m s(-1) in rho <= 0.5, while the convection velocity is inward in rho >= 0.6. In the outer-deposited ECRH discharge, on the other hand, the convection velocity takes a big negative value in rho <= 0.4 and close to zero at rho similar to 0.6. In ohmic discharges, an inward V(rho) always appears in the whole plasma radii and gradually increases toward the plasma edge (-3.2 m s(-1) at rho = 1). The simulation result also indicates that centrally-peaked Al ion density profiles presented in the outer-deposited ECRH discharge can be flattened by the inner-deposited ECRH. Modification of impurity transport is discussed in the presence of long-lasting m/n = 1/1 MHD mode.

引用

页数：13

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