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Analysis of satured ohmic confinement in FT tokamak

Technical Report:

Abstract

The energy confinement time for ohmically heated discharges in the FT (Frascati, Italy) tokamak was studied in a wide range of plasma parameters. It was found to increase linearly with the line averaged density below a value of 1x10/sup 14/ per cubic centimeter and to saturate at higher densities. Analysis of the experimental data showed that, at the same density at which saturation was reached, the effective charge state became nearly equal to 1, and the electron and ion temperatures became nearly equal. The saturated energy confinement time showed a strong isotope effect with a reduction factor of 1.5 when operating in hydrogen. The sawtooth period was closely correlated with energy confinement time and displayed the same saturated behaviour and isotope effect. The ion thermal diffusivity was found to be compatible with neoclassical theory up to the maximum density, but a neoclassical multiplier of 3 would only fit the highest line averaged density data. The electron thermal diffusivity first decreased with the inverse of line averaged density, but remained nearly constant in the saturated region. Therefore, ohmic saturation in the FT seems to be primarily caused by electron transport.
Publication Date:
May 01, 1991
Product Type:
Technical Report
Report Number:
ENEA-RT-NUCL-90-40; CONF-901025-48; RT/NUCL-90-40
Reference Number:
SCA: 700310; 700411; PA: ITAN-91:002072; SN: 92000621809
Resource Relation:
Conference: 13. international conference on plasma physics and controlled nuclear fusion research,Washington, DC (United States),1-6 Oct 1990; Other Information: DN: From 13. International conference on plasma physics and controlled nuclear fusion research; Washington, USA (1-6 Oct 1990); PBD: May 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FT TOKAMAK; PLASMA CONFINEMENT; PARAMETRIC ANALYSIS; CONFINEMENT TIME; ELECTRON DENSITY; ION TEMPERATURE; ELECTRON TEMPERATURE; THERMAL DIFFUSIVITY; NEOCLASSICAL TRANSPORT THEORY; SAWTOOTH OSCILLATIONS; EXPERIMENTAL DATA; 700310; 700411; INERTIAL CONFINEMENT DEVICES
OSTI ID:
10107624
Research Organizations:
ENEA, Frascati (Italy). Dipt. Fusione
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1120-5598; Other: ON: DE92744001; TRN: 91:002072
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
ITAN
Size:
11 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Alladio, F, Apruzzese, G, Barbato, E, Bardotti, G, Bartiromo, R, Berton, F, Bombarda, F, Bracco, G, Briguglio, S, and Buceti, G. Analysis of satured ohmic confinement in FT tokamak. Italy: N. p., 1991. Web.
Alladio, F, Apruzzese, G, Barbato, E, Bardotti, G, Bartiromo, R, Berton, F, Bombarda, F, Bracco, G, Briguglio, S, & Buceti, G. Analysis of satured ohmic confinement in FT tokamak. Italy.
Alladio, F, Apruzzese, G, Barbato, E, Bardotti, G, Bartiromo, R, Berton, F, Bombarda, F, Bracco, G, Briguglio, S, and Buceti, G. 1991. "Analysis of satured ohmic confinement in FT tokamak." Italy.
@misc{etde_10107624,
title = {Analysis of satured ohmic confinement in FT tokamak}
author = {Alladio, F, Apruzzese, G, Barbato, E, Bardotti, G, Bartiromo, R, Berton, F, Bombarda, F, Bracco, G, Briguglio, S, and Buceti, G}
abstractNote = {The energy confinement time for ohmically heated discharges in the FT (Frascati, Italy) tokamak was studied in a wide range of plasma parameters. It was found to increase linearly with the line averaged density below a value of 1x10/sup 14/ per cubic centimeter and to saturate at higher densities. Analysis of the experimental data showed that, at the same density at which saturation was reached, the effective charge state became nearly equal to 1, and the electron and ion temperatures became nearly equal. The saturated energy confinement time showed a strong isotope effect with a reduction factor of 1.5 when operating in hydrogen. The sawtooth period was closely correlated with energy confinement time and displayed the same saturated behaviour and isotope effect. The ion thermal diffusivity was found to be compatible with neoclassical theory up to the maximum density, but a neoclassical multiplier of 3 would only fit the highest line averaged density data. The electron thermal diffusivity first decreased with the inverse of line averaged density, but remained nearly constant in the saturated region. Therefore, ohmic saturation in the FT seems to be primarily caused by electron transport.}
place = {Italy}
year = {1991}
month = {May}
}