Localized Scrape-Off Layer density modifications by Ion Cyclotron near fields in JET and ASDEX-Upgrade L-mode plasmas

被引：12

作者：

Colas, L. ^{[1
]}

Jacquet, Ph. ^{[2
]}

Van Eester, D. ^{[3
]}

Bobkov, V. ^{[4
]}

Brix, M. ^{[2
]}

Meneses, L. ^{[2
]}

Tamain, P. ^{[1
]}

Marsen, S. ^{[2
]}

Silva, C. ^{[5
]}

Carralero, D. ^{[4
]}

Kocan, M. ^{[4
]}

Mueller, H. -W. ^{[4
]}

Crombe, K. ^{[3
]}

Krivska, A. ^{[3
]}

Goniche, M. ^{[1
]}

Lerche, E. ^{[3
]}

Rimini, F. G. ^{[2
]}

机构：

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

[2] CCFE, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[3] LPP ERM KMS, TEC Partner, Brussels, Belgium

[4] EURATOM, Max Planck Inst Plasmaphys, D-14476 Garching, Germany

[5] Univ Lisbon, Inst Super Tecn, Inst Plasma & Fusao Nucl, Lisbon, Portugal

[6] JET EFDA, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 463卷

关键词：

CONVECTION;

D O I：

10.1016/j.jnucmat.2014.10.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Combining Lithium beam emission spectroscopy and edge reflectometry, localized Scrape-Off Layer (SOL) density modifications by Ion Cyclotron Range of Frequencies (ICRF) near fields were characterized in JET L-mode plasmas. When using the ICRF wave launchers connected magnetically to the Li-beam chord, the density decreased more steeply 2-3 cm outside the last closed flux surface (mapped onto the outer mid-plane) and its value at the outer limiter radial position was half the ohmic value. The depletion depends on the ICRF power and on the phasing between adjacent radiating straps. Convection due to ponderomotive effects and/or E x B-0 drifts is suspected: during ICRF-heated H-mode discharges in 2013, DC potentials up to 70 V were measured locally in the outer SOL by a floating reciprocating probe, located toroidally several metres from the active antennas. These observations are compared with probe measurements on ASDEX-Upgrade. Their implications for wave coupling, heat loads and impurity production are discussed. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：735 / 738

页数：4

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