Plasma start-up design for initial discharges in HL-2M

被引：5

作者：

Li, J. X. ^{[1
]}

Song, X. M. ^{[1
]}

Zhang, J. H. ^{[1
]}

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

Pan, W. ^{[1
]}

Xue, L. ^{[1
]}

Wang, S. ^{[1
]}

Li, B. ^{[1
]}

Song, X. ^{[1
]}

Mao, R. ^{[1
]}

Pan, Y. D. ^{[1
]}

机构：

[1] Southwestern Inst Phys SWIP, Chengdu, Sichuan, Peoples R China

来源：

FUSION ENGINEERING AND DESIGN | 2020年 / 150卷

基金：

中国国家自然科学基金;

关键词：

HL-2M; First plasma; Eddy current; Field null; Plasma breakdown;

D O I：

10.1016/j.fusengdes.2019.111366

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

HL-2M is a new medium-sized copper-conductor tokamak currently under final construction. Taking into account potential uncertainties in the engineering construction and to resolve design anomalies associated with new machine startup, high loop voltages ( > 10 V) without ECRH-assisted startup will be one of the important scenarios for the first plasmas in HL-2M. A basic field null configuration is obtained, that satisfies the initial discharge breakdown and the discharge evolution specifications, utilizing the CS, PF6 and PF8 coils of HL-2M. High loop voltage induces large stray magnetic field due to wall eddy currents in the vacuum vessel. Two schemes for compensating the stray field are investigated, using the PF8 coils. One scheme assumes the compensating current I-PF8 being proportional to the wall eddy current, and the other scheme assumes fixed I-PF8. With two schemes, self-consistent discharge waveforms are designed for the limiter configuration, by solving circuit equations for the plasma-conductor-power system. With the compensating current I-PF8 fixed at a value between -150 A and - 200 A, a good field null configuration is obtained. Evolution of the equilibrium configuration is further evaluated by the EFIT code, confirming self-consistency of the discharge waveform.

引用

页数：9

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