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Title: An energy-confinement study of the MST reversed-field pinch using a Thomson-scattering diagnostic

Abstract

Thomson scattering measurements of the central electron temperature and density during the plasma current peak have been performed on the MST Reversed Field Pinch (RFP). This Thomson scattering diagnostic was calibrated for absolute electron density measurements. These measurements of T{sub e} and n{sub e}, when combined with profile assumptions, were used to calculate estimates of energy confinement time ({tau}{sub E}) and poloidal beta ({beta}{sub {theta}}). A standard discharge with I{sub p} {approx} 400 kA, F {approx} {minus}0.1, and {theta} {approx} 1.6 typically exhibited T{sub e} {approx} 275 eV, n{sub e} {approx} 2.0 {times} 10{sup 13} cm{sup {minus}3}, {tau}{sub E} < 1 ms, and {beta}{sub {theta}} < 8%. The results of a limited plasma current scaling study did not indicate a strong scaling of T{sub e} or {tau}{sub E} with I{sub p}. The Thomson scattering diagnostic was used in conjunction with a bolometer, VUV radiation monitor, and edge magnetic coils to study the loss of energy from the plasma. Results indicate that thermal transport from stochastic magnetic fields, particle loss, and radiation are important energy loss processes. The experiments done for this study included an F-scan, a paddle limiter insertion series, and an argon doping series. The plasma maintained a constantmore » {beta}{sub {theta}} during these perturbation experiments, suggesting that increases in one energy loss channel are compensated by drops in other channels and increases in input power to the plasma.« less

Authors:
Publication Date:
Research Org.:
Wisconsin Univ., Madison, WI (United States)
OSTI Identifier:
5126276
Alternate Identifier(s):
OSTI ID: 5126276
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FIELD-REVERSED THETA PINCH DEVICES; PLASMA CONFINEMENT; BOLOMETERS; CONFINEMENT TIME; ELECTRON DENSITY; ELECTRON TEMPERATURE; ENERGY LOSSES; PLASMA DIAGNOSTICS; RADIATION MONITORS; TEMPERATURE MEASUREMENT; THOMSON SCATTERING; CLOSED PLASMA DEVICES; COMPACT TORUS; CONFINEMENT; INELASTIC SCATTERING; LOSSES; MEASURING INSTRUMENTS; MONITORS; PINCH DEVICES; SCATTERING; THERMONUCLEAR DEVICES; TORI 700101* -- Fusion Energy-- Plasma Research-- Confinement, Heating, & Production

Citation Formats

Den Hartog, D.J. An energy-confinement study of the MST reversed-field pinch using a Thomson-scattering diagnostic. United States: N. p., 1989. Web.
Den Hartog, D.J. An energy-confinement study of the MST reversed-field pinch using a Thomson-scattering diagnostic. United States.
Den Hartog, D.J. Sun . "An energy-confinement study of the MST reversed-field pinch using a Thomson-scattering diagnostic". United States.
@article{osti_5126276,
title = {An energy-confinement study of the MST reversed-field pinch using a Thomson-scattering diagnostic},
author = {Den Hartog, D.J.},
abstractNote = {Thomson scattering measurements of the central electron temperature and density during the plasma current peak have been performed on the MST Reversed Field Pinch (RFP). This Thomson scattering diagnostic was calibrated for absolute electron density measurements. These measurements of T{sub e} and n{sub e}, when combined with profile assumptions, were used to calculate estimates of energy confinement time ({tau}{sub E}) and poloidal beta ({beta}{sub {theta}}). A standard discharge with I{sub p} {approx} 400 kA, F {approx} {minus}0.1, and {theta} {approx} 1.6 typically exhibited T{sub e} {approx} 275 eV, n{sub e} {approx} 2.0 {times} 10{sup 13} cm{sup {minus}3}, {tau}{sub E} < 1 ms, and {beta}{sub {theta}} < 8%. The results of a limited plasma current scaling study did not indicate a strong scaling of T{sub e} or {tau}{sub E} with I{sub p}. The Thomson scattering diagnostic was used in conjunction with a bolometer, VUV radiation monitor, and edge magnetic coils to study the loss of energy from the plasma. Results indicate that thermal transport from stochastic magnetic fields, particle loss, and radiation are important energy loss processes. The experiments done for this study included an F-scan, a paddle limiter insertion series, and an argon doping series. The plasma maintained a constant {beta}{sub {theta}} during these perturbation experiments, suggesting that increases in one energy loss channel are compensated by drops in other channels and increases in input power to the plasma.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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