Sawtooth control using electron cyclotron current drive in the presence of energetic particles in high performance ASDEX Upgrade plasmas

被引：7
|
作者：
Chapman, I. T. [1 ]
Igochine, V. [2 ]
Maraschek, M. [2 ]
McCarthy, P. J. [3 ]
Tardini, G. [2 ]
机构：
[1] Culham Sci Ctr, Euratom CCFE Fus Assoc, Abingdon OX14 3DB, Oxon, England
[2] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany
[3] Natl Univ Ireland Univ Coll Cork, Dept Phys, EURATOM Assoc DCU, Cork, Ireland
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2013年 / 55卷 / 06期
关键词：
INTERNAL KINK MODE; OSCILLATIONS; DISCHARGES; STABILITY; ROTATION; PERIOD; ECCD;
D O I：
10.1088/0741-3335/55/6/065009
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：
Sawtooth control using steerable electron cyclotron current drive (ECCD) has been demonstrated in ASDEX Upgrade plasmas with a significant population of energetic ions in the plasma core and long uncontrolled sawtooth periods. The sawtooth period is found to be minimized when the ECCD resonance is swept to just inside the q = 1 surface. By utilizing ECCD inside q = 1 for sawtooth control, it is possible to avoid the triggering of neoclassical tearing modes (NTMs), even at significantly higher pressure than anticipated in the ITER baseline scenario. Operation at 25% higher normalized pressure has been achieved when only modest ECCD power is used for sawtooth control compared to identical discharges without sawtooth control when NTMs are triggered by the sawteeth. Modelling suggests that the destabilization arising from the change in the local magnetic shear caused by the ECCD is able to compete with the stabilizing influence of the energetic particles inside the q = 1 surface.
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页数：9
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