Investigation of fast ion pressure effects in ASDEX Upgrade by spectral MSE measurements

被引：9
|
作者：
Reimer, Rene [1 ]
Dinklage, Andreas [1 ]
Wolf, Robert [1 ]
Dunne, Mike [2 ]
Geiger, Benedikt [2 ]
Hobirk, Joerg [2 ]
Reich, Matthias [2 ]
Mc Carthy, Patrick J. [3 ]
机构：
[1] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany
[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[3] Univ Coll Cork, Dept Phys, Cork, Ireland
来源：
NUCLEAR FUSION | 2017年 / 57卷 / 04期
关键词：
motional Stark effect; combined Zeeman and motional stark effect; beam emission spectroscopy; magnetic field measurements; magnetically confined plasmas; plasma diamagnetism; fast ions in tokamaks; DIAGNOSTICS;
D O I：
10.1088/1741-4326/aa5877
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：
High precision measurements of fast ion effects on the magnetic equilibrium in the ASDEX Upgrade tokamak have been conducted in a high-power (10 MW) neutral-beam injection discharge. An improved analysis of the spectral motional Stark effect data based on forward-modeling, including the Zeeman effect, fine-structure and non-statistical sub-level distribution, revealed changes in the order of 1% in |(B) over right arrow|. The results were found to be consistent with results from the equilibrium solver CLISTE. The measurements allowed us to derive the fast ion pressure fraction to be Delta p(FI)/p(mhd) approximate to 10% and variations of the fast ion pressure are consistent with calculations of the transport code TRANSP. The results advance the understanding of fast ion confinement and magneto-hydrodynamic stability in the presence of fast ions.
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页数：11
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