scholarly journals Neoclassical transport in a multiple-helicity torsatron in the low-collisionality regime - strong radial electric-field limit

1983 ◽  
Author(s):  
K. C. Shaing
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Field Limit ◽  
Neoclassical Transport

scholarly journals Collisional transport of impurities with flux-surface varying density in stellarators

2018 ◽  
Vol 84 (4) ◽  
Author(s):  
S. Buller ◽  
H. M. Smith ◽  
P. Helander ◽  
A. Mollén ◽  
S. L. Newton ◽  
...  
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Magnetic Confinement ◽  
Vacuum Field ◽  
Flux Surface ◽  
Impurity Density ◽  
Impurity Transport ◽  
Neoclassical Transport ◽  
Potential Perturbation ◽  
Analytic Models

High-$Z$impurities in magnetic-confinement devices are prone to develop density variations on the flux surface, which can significantly affect their transport. In this paper, we generalize earlier analytic stellarator calculations of the neoclassical radial impurity flux in the mixed-collisionality regime (collisional impurities and low-collisionality bulk ions) to include the effect of such flux-surface variations. We find that only in the homogeneous density case is the transport of highly collisional impurities (in the Pfirsch–Schlüter regime) independent of the radial electric field. We study these effects for a Wendelstein 7-X (W7-X) vacuum field, with simple analytic models for the potential perturbation, under the assumption that the impurity density is given by a Boltzmann response to a perturbed potential. In the W7-X case studied, we find that larger amplitude potential perturbations cause the radial electric field to dominate the transport of the impurities. In addition, we find that classical impurity transport can be larger than the neoclassical transport in W7-X.

scholarly journals Analysis of Radial Electric Field Bifurcation in LHD Based on Neoclassical Transport Theory

2003 ◽  
Vol 79 (8) ◽  
pp. 816-820 ◽  
Author(s):  
Masayuki YOKOYAMA ◽  
Katsumi IDA ◽  
Takashi SHIMOZUMA ◽  
Kiyomasa WATANABE ◽  
Shin KUBO ◽  
...  
Keyword(s):  
Electric Field ◽  
Transport Theory ◽  
Radial Electric Field ◽  
Neoclassical Transport

Role of Neoclassical Transport and Radial Electric Field in LHD Plasmas

2010 ◽  
Vol 58 (1) ◽  
pp. 269-276 ◽  
Author(s):  
M. Yokoyama ◽  
A. Wakasa ◽  
S. Murakami ◽  
K. Y. Watanabe ◽  
S. Satake ◽  
...  
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Neoclassical Transport

Anomalous and neoclassical transport suppression by the radial electric field, induced by Alfvén waves in tokamaks

1999 ◽  
Vol 6 (9) ◽  
pp. 3548-3553 ◽  
Author(s):  
V. S. Tsypin ◽  
I. C. Nascimento ◽  
R. M. O. Galvão ◽  
A. G. Elfimov ◽  
G. S. Amarante Segundo ◽  
...  
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Neoclassical Transport

scholarly journals Investigation of turbulence rotation and radial electric field in the island divertor and plasma edge at W7-X

2019 ◽  
Vol 61 (5) ◽  
pp. 054003 ◽  
Author(s):  
A Krämer-Flecken ◽  
X Han ◽  
T Windisch ◽  
J Cosfeld ◽  
P Drews ◽  
...  
Keyword(s):  
Electric Field ◽  
Radial Electric Field ◽  
Plasma Edge

Features of radial electric field in impurity-seeded, detached plasma in a tokamak

2021 ◽  
Vol 28 (6) ◽  
pp. 062507
Author(s):  
I. Senichenkov ◽  
E. Kaveeva ◽  
V. Rozhansky ◽  
D. Coster
Keyword(s):  
Electric Field ◽  
Radial Electric Field
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