skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Frequency modulation continuous wave reflectometry measurements of plasma position in ASDEX Upgrade ELMy H-mode regimes

Abstract

Plasma position measurements of frequency modulation continuous wave reflectometry are analyzed in ASDEX Upgrade ELMy H-mode regimes [International Thermonuclear Energy Reactor (ITER) reference scenario], to assess the viability of using reflectometry for position and shape control purposes in ITER. Plasma separatrix position is estimated both at the low and high field sides of the tokamak. A scaling factor applied to the linear average density (an ITER online measurement) is used to estimate the separatrix density, whose position is then tracked using reflectometry profile measurements. Edge localized mode (ELM) activity effects are overcome by disregarding measurements performed during the onset and magnetohydrodynamic phases of the ELMs. Position data is compared, with data derived from the magnetics and its quality is assessed using one dimensional full-wave numerical simulations, taking into account the influence of the nonprobed edge plasma region (O-mode operation) and of the plasma turbulence. Results indicate that selecting an adequate scaling to the linear average density leads to a good estimate of the separatrix position, even when the pedestal is out of the measuring range, which will be the case of ITER position reflectometer.

Authors:
; ;  [1]
  1. Centro de Fusao Nuclear, Associacao EURATOM/IST, 1049-001 Lisbon (Portugal)
Publication Date:
OSTI Identifier:
20641173
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 75; Journal Issue: 10; Other Information: DOI: 10.1063/1.1788832; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ASDEX Upgrade Team; Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASDEX TOKAMAK; BOUNDARY LAYERS; EDGE LOCALIZED MODES; FREQUENCY MODULATION; H-MODE PLASMA CONFINEMENT; ITER TOKAMAK; MAGNETOHYDRODYNAMICS; PLASMA DENSITY; PLASMA DIAGNOSTICS; SCALING; SIMULATION; TURBULENCE

Citation Formats

Santos, J, Hacquin, S, Manso, M, and Max-Planck Institut fuer Plasmaphysik EURATOM/IPP Association, 85748 Garching. Frequency modulation continuous wave reflectometry measurements of plasma position in ASDEX Upgrade ELMy H-mode regimes. United States: N. p., 2004. Web. doi:10.1063/1.1788832.
Santos, J, Hacquin, S, Manso, M, & Max-Planck Institut fuer Plasmaphysik EURATOM/IPP Association, 85748 Garching. Frequency modulation continuous wave reflectometry measurements of plasma position in ASDEX Upgrade ELMy H-mode regimes. United States. https://doi.org/10.1063/1.1788832
Santos, J, Hacquin, S, Manso, M, and Max-Planck Institut fuer Plasmaphysik EURATOM/IPP Association, 85748 Garching. 2004. "Frequency modulation continuous wave reflectometry measurements of plasma position in ASDEX Upgrade ELMy H-mode regimes". United States. https://doi.org/10.1063/1.1788832.
@article{osti_20641173,
title = {Frequency modulation continuous wave reflectometry measurements of plasma position in ASDEX Upgrade ELMy H-mode regimes},
author = {Santos, J and Hacquin, S and Manso, M and Max-Planck Institut fuer Plasmaphysik EURATOM/IPP Association, 85748 Garching},
abstractNote = {Plasma position measurements of frequency modulation continuous wave reflectometry are analyzed in ASDEX Upgrade ELMy H-mode regimes [International Thermonuclear Energy Reactor (ITER) reference scenario], to assess the viability of using reflectometry for position and shape control purposes in ITER. Plasma separatrix position is estimated both at the low and high field sides of the tokamak. A scaling factor applied to the linear average density (an ITER online measurement) is used to estimate the separatrix density, whose position is then tracked using reflectometry profile measurements. Edge localized mode (ELM) activity effects are overcome by disregarding measurements performed during the onset and magnetohydrodynamic phases of the ELMs. Position data is compared, with data derived from the magnetics and its quality is assessed using one dimensional full-wave numerical simulations, taking into account the influence of the nonprobed edge plasma region (O-mode operation) and of the plasma turbulence. Results indicate that selecting an adequate scaling to the linear average density leads to a good estimate of the separatrix position, even when the pedestal is out of the measuring range, which will be the case of ITER position reflectometer.},
doi = {10.1063/1.1788832},
url = {https://www.osti.gov/biblio/20641173}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 75,
place = {United States},
year = {Fri Oct 01 00:00:00 EDT 2004},
month = {Fri Oct 01 00:00:00 EDT 2004}
}