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Turbulent fluctuations and radial transport in the scrape-off layer of the ASDEX tokamak

Abstract

Electrostatic fluctuations have been measured in the scrape-off layer of ASDEX by Langmuir probes and by observation of H{sub {alpha}} light with high poloidal and temporal resolution. It was demonstrated that these fluctuations contribute a significant, if not dominant, fraction of the ``anomalous`` radial particle transport. A model for an instability mechanism specific to the SOL is presented including density, temperature and electric potential fluctuations. From this model mixing length estimates for the radial transport and resulting density and pressure gradients in the SOL are derived and compared to measurements in the mid-plane and in the divertor of ASDEX. In spite of several simplifications in the model a quantitative agreement up to factors of 1-3 and a qualitative agreement for variations of discharge parameters is achieved between the model predictions and the measurements. ((orig.)).
Authors:
Endler, M; [1]  Giannone, L.; [1]  McCormick, K; [1]  Niedermeyer, H; [1]  Rudyj, A; [1]  Theimer, G; [1]  Tsois, N; [2]  ASDEX Team
  1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 85740 Garching (Germany)
  2. NCSR `Demokritos`, Athens (Greece)
Publication Date:
Apr 01, 1995
Product Type:
Journal Article
Report Number:
CONF-940580-
Reference Number:
SCA: 700310; 700420; PA: AIX-26:058034; EDB-95:109434; SN: 95001428910
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 220-222; Journal Issue: 1-3; Conference: 11. international conference on plasma surface interactions in controlled fusion devices, Mito (Japan), 23-27 May 1994; Other Information: PBD: 1 Apr 1995
Subject:
70 PLASMA PHYSICS AND FUSION; DIVERTORS; PLASMA SCRAPE-OFF LAYER; ELECTRIC POTENTIAL; FLUCTUATIONS; ELECTRIC DISCHARGES; ELECTRIC FIELDS; ELECTRON EMISSION; IMPURITIES; LANGMUIR PROBE; POLOIDAL FIELD DIVERTORS; PRESSURE GRADIENTS; SECONDARY EMISSION; SPATIAL DISTRIBUTION; TEMPERATURE DEPENDENCE; TOKAMAK DEVICES; TURBULENCE; TURBULENT FLOW
OSTI ID:
75036
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: JNUMAM; ISSN 0022-3115; TRN: NL95FC175058034
Submitting Site:
NLN
Size:
pp. 293-297
Announcement Date:

Citation Formats

Endler, M, Giannone, L., McCormick, K, Niedermeyer, H, Rudyj, A, Theimer, G, Tsois, N, and ASDEX Team. Turbulent fluctuations and radial transport in the scrape-off layer of the ASDEX tokamak. Netherlands: N. p., 1995. Web. doi:10.1016/0022-3115(94)00431-5.
Endler, M, Giannone, L., McCormick, K, Niedermeyer, H, Rudyj, A, Theimer, G, Tsois, N, & ASDEX Team. Turbulent fluctuations and radial transport in the scrape-off layer of the ASDEX tokamak. Netherlands. doi:10.1016/0022-3115(94)00431-5.
Endler, M, Giannone, L., McCormick, K, Niedermeyer, H, Rudyj, A, Theimer, G, Tsois, N, and ASDEX Team. 1995. "Turbulent fluctuations and radial transport in the scrape-off layer of the ASDEX tokamak." Netherlands. doi:10.1016/0022-3115(94)00431-5. https://www.osti.gov/servlets/purl/10.1016/0022-3115(94)00431-5.
@misc{etde_75036,
title = {Turbulent fluctuations and radial transport in the scrape-off layer of the ASDEX tokamak}
author = {Endler, M, Giannone, L., McCormick, K, Niedermeyer, H, Rudyj, A, Theimer, G, Tsois, N, and ASDEX Team}
abstractNote = {Electrostatic fluctuations have been measured in the scrape-off layer of ASDEX by Langmuir probes and by observation of H{sub {alpha}} light with high poloidal and temporal resolution. It was demonstrated that these fluctuations contribute a significant, if not dominant, fraction of the ``anomalous`` radial particle transport. A model for an instability mechanism specific to the SOL is presented including density, temperature and electric potential fluctuations. From this model mixing length estimates for the radial transport and resulting density and pressure gradients in the SOL are derived and compared to measurements in the mid-plane and in the divertor of ASDEX. In spite of several simplifications in the model a quantitative agreement up to factors of 1-3 and a qualitative agreement for variations of discharge parameters is achieved between the model predictions and the measurements. ((orig.)).}
doi = {10.1016/0022-3115(94)00431-5}
journal = {Journal of Nuclear Materials}
issue = {1-3}
volume = {220-222}
journal type = {AC}
place = {Netherlands}
year = {1995}
month = {Apr}
}