Impurity transport studies in RFX-mod multiple helicity and enhanced confinement QSH regimes

被引：23
|
作者：
Menmuir, S. [1 ]
Carraro, L. [1 ]
Alfier, A. [1 ]
Bonomo, F. [1 ]
Fassina, A. [1 ]
Spizzo, G. [1 ]
Vianello, N. [1 ]
机构：
[1] Assoc EURATOM ENEA Fus, Consorzio RFX, Padua, Italy
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2010年 / 52卷 / 09期
关键词：
REVERSED-FIELD PINCH; RESOLUTION; RADIATION; TOKAMAK; JET;
D O I：
10.1088/0741-3335/52/9/095001
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：
The transport of intrinsic and artificially introduced impurities is investigated in the multiple helicity (MH) and quasi-single helicity (QSH) plasma regimes of the RFX-mod reversed-field pinch. Impurities are introduced through Ni laser blow-off and Ne gas puffing in both magnetic confinement scenarios. Simulation of experimental spectroscopic measurements, including line and soft x-ray emission, electron density and radiated power is carried out with a one-dimensional collisional-radiative model. For both QSH and MH an outwardly directed pinch velocity with a large barrier in the edge and no reversal is determined, accompanied by a diffusion coefficient that is an order of magnitude greater in the core than at the edge. The established transport parameters are similar for the Ni and Ne injected impurities with the transition region and barrier less external and stronger in the QSH regime.
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页数：17
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