Studies of EC pre-ionization in DIII-D to support development of ITER plasma initiation

被引：9
|
作者：
Sinha, J. [1 ]
de Vries, P. C. [1 ]
Walker, M. L. [2 ]
Battaglia, D. J. [3 ]
Turco, F. [4 ]
Hyatt, A. [2 ]
Kim, H. T. [5 ]
Stober, J. [6 ]
Yoneda, R. [7 ]
Gribov, Y. [1 ]
Haskey, S. R. [3 ]
Bykov, I [2 ]
Hollmann, E. [8 ]
Herfindal, J. L. [9 ]
Glass, F. [2 ]
Chen, J. [7 ]
McLean, A. [10 ]
机构：
[1] ITER Org, Route Vinon Sur Verdon,CS 90 046, F-13067 St Paul Les Durance, France
[2] Gen Atom, San Diego, CA USA
[3] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA
[4] Columbia Univ, New York, NY USA
[5] Culham Sci Ctr, EUROfus Programme Management Unit, Abingdon OX14 3DB, North Ireland
[6] Max Planck Inst Plasma Phys, Garching, Germany
[7] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[8] Univ Calif San Diego, La Jolla, CA 92093 USA
[9] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA
[10] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
来源：
NUCLEAR FUSION | 2022年 / 62卷 / 06期
关键词：
tokamak; plasma initiation; electron cyclotron waves; START-UP; CYCLOTRON;
D O I：
10.1088/1741-4326/ac59ea
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：
New experiments have been conducted at DIII-D to improve the physics understanding of plasma initiation assisted by electron cyclotron (EC) wave injection, allowing better extrapolation to ITER. This has been achieved by applying an EC pulse prior to start of the inductive plasma initiation (i.e. the generation of a loop voltage). A pre-plasma was formed during the EC pulse that was characterized in terms of the maximum density and temperature. Parametric scans were performed to study the influence of the EC injected power, EC injection angle, and pre-fill gas pressure on the pre-plasma creation process. These experiments showed that pre-ionized plasma of good quality can have a significant effect on the subsequent V (loop) induced plasma initiation process, i.e. a high density pre-plasma, increases the plasma current rise and speed at which ionization is achieved when the V (loop) is applied. A good quality pre-plasma is one that achieved a significant degree of ionization, mainly obtained by providing sufficient ECH power in DIII-D of the order of 1 MW. It was found that a minimum EC power of 0.5 MW was required in DIII-D to create ionization, and this would scale to a minimum power of roughly 6.5 MW for ITER.
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页数：14
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