A new mechanism for filament disconnection at the X-point: poloidal shear in radial E x B velocity

被引：9

作者：

Nespoli, F. ^{[1
,4
]}

Tamain, P. ^{[2
]}

Fedorczak, N. ^{[2
]}

Galassi, D. ^{[3
]}

Marandet, Y. ^{[4
]}

机构：

[1] Princeton Plasma Phys Lab, 100 Stellarator Rd, Princeton, NJ 08540 USA

[2] CEA Cadarache, IRFM, F-13108 St Paul Les Durance, France

[3] Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland

[4] Aix Marseille Univ, CNRS, PIIM UMR 7345, Marseille, France

来源：

NUCLEAR FUSION | 2020年 / 60卷 / 04期

关键词：

turbulence; sheared flow; plasma filaments; EDGE; TURBULENCE; TRANSPORT; PLASMAS; SOL;

D O I：

10.1088/1741-4326/ab6f1e

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：

Plasma filaments generated by turbulence in the scrape-off layer are sometimes observed in experiments and simulations to disconnect from the target plate in the vicinity of the X-point, resulting in a 'quiescent zone' with reduced fluctuations, possibly affecting the fluctuating part of the divertor heat loads. This phenomena is usually explained by the flux tubes squeezing, induced by flux expansion, down to scales where collisions dominate. In this work, we consider an additional mechanism spontaneously arising at the X-point: the poloidal shear in radial E x B velocity. Through a simple model, tested against 3D global turbulence simulations, we quantify the effectiveness of this disconnection mechanism and identify ways to control it.

引用

页数：8

共 50 条

[21] Numerical simulation of plasma edge turbulence due to E x B flow velocity shear
Shoucri, M
CZECHOSLOVAK JOURNAL OF PHYSICS, 2001, 51 (10) : 1139 - 1151
[22] POLOIDAL DIVERTOR EXPERIMENT WITH APPLIED E-] X B-] DRIFT
STRAIT, EJ
BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1978, 23 (07): : 895 - 896
[23] New low temperature multidipole plasma device with a magnetic X-point and its properties
Lim, Yegeon
You, Yong Sung
Lee, Wonjun
Ahn, Bin
Moon, Se Youn
Kim, Bosung
Woo, H. J.
Lho, Taihyeop
Choe, Wonho
Ghim, Y-C
PLASMA SOURCES SCIENCE & TECHNOLOGY, 2020, 29 (11):
[24] Theory of mean E x B shear in a stochastic magnetic field: ambipolarity breaking and radial current
Guo, Weixin
Jiang, Min
Diamond, Patrick H.
Chen, Chang-Chun
Cao, Mingyun
Li, Hanhui
Long, Ting
PLASMA PHYSICS AND CONTROLLED FUSION, 2022, 64 (12)
[25] Asymptotic velocity of relativistic E x B drift
Nakamura, Tatsufumi
AIP ADVANCES, 2021, 11 (03)
[26] Simple models for the radial and poloidal E x B drifts in the scrape-off layer of a divertor tokamak: Effects on in/out asymmetries
Stangeby, PC
Chankin, AV
NUCLEAR FUSION, 1996, 36 (07) : 839 - 852
[27] Characterization of the radial electric field and edge velocity shear in Wendelstein 7-X
Carralero, D.
Estrada, T.
Windisch, T.
Velasco, J. L.
Alonso, J. A.
Beurskens, M.
Bozhenkov, S.
Damm, H.
Fuchert, G.
Gao, Y.
Jakubowski, M.
Nieman, H.
Pablant, N.
Pasch, E.
Weir, G.
NUCLEAR FUSION, 2020, 60 (10)
[28] Effects of E x B velocity shear and magnetic shear in the formation of core transport barriers in the DIII-D tokamak
Burrell, KH
Austin, ME
Greenfieldt, CM
Lao, LL
Rice, BW
Staebler, GM
Stallard, BW
PLASMA PHYSICS AND CONTROLLED FUSION, 1998, 40 (09) : 1585 - 1596
[29] Turbulence regulation with radial wavenumber spectral shift caused by externally driven E x B velocity shear during edge-localized mode mitigation
Xiao, G. L.
Zou, X. L.
Zhong, W. L.
Song, S. D.
Duan, X. R.
Liu, A. D.
Bai, X. Y.
Cheng, J.
Cui, Z. Y.
Delpech, L.
Ding, X. T.
Dong, J. Q.
Ekedahl, A.
Feng, B. B.
Giruzzi, G.
Gao, J. M.
Goniche, M.
Hoang, G. T.
Ji, X. Q.
Jiang, M.
Lu, B.
Mazon, D.
Peysson, Y.
Song, X. M.
Shi, Z. B.
Xu, M.
Yang, Z. C.
Yu, D. L.
Zhang, B. Y.
Zhang, Y. P.
Zhou, Y.
NUCLEAR FUSION, 2019, 59 (12)
[30] SIMPLE SPECTRUM MONITOR FOR E X B VELOCITY FILTERS
RYSSEL, H
MULLER, H
SCHMID, K
NUCLEAR INSTRUMENTS & METHODS, 1974, 116 (03): : 593 - 595

← 1 2 3 4 5 →