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Title: Fivefold confinement time increase in the Madison Symmetric Torus using inductive poloidal current drive

Abstract

Current profile control is employed in the Madison Symmetric Torus reversed field pinch to reduce the magnetic fluctuations responsible for anomalous transport. An inductive poloidal electric field pulse is applied in the sense to flatten the parallel current profile, reducing the dynamo fluctuation amplitude required to sustain the equilibrium. This technique demonstrates a substantial reduction in fluctuation amplitude (as much as 50%), and improvement in energy confinement (from 1 ms to 5 ms); a record low fluctuation (0.8%) and record high temperature (615 eV) for this device were observed simultaneously during current drive experiments. Plasma beta increases by 50% and the Ohmic input power is three times lower. Particle confinement improves and plasma impurity contamination is reduced. The results of the transient current drive experiments provide motivation for continuing development of steady-state current profile control strategies for the reversed field pinch.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Wisconsin Univ., Madison, WI (United States). Dept. of Physics
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
434481
Report Number(s):
DOE/ER/54345-285
ON: DE97002714; TRN: 97:004387
DOE Contract Number:  
FG02-96ER54345
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; REVERSE-FIELD PINCH; CURRENT-DRIVE HEATING; MAGNETIC CONFINEMENT; CONFINEMENT TIME; TIME DEPENDENCE

Citation Formats

Stoneking, M R, Lanier, N E, Prager, S C, Sarff, J S, and Sinitsyn, D. Fivefold confinement time increase in the Madison Symmetric Torus using inductive poloidal current drive. United States: N. p., 1996. Web. doi:10.2172/434481.
Stoneking, M R, Lanier, N E, Prager, S C, Sarff, J S, & Sinitsyn, D. Fivefold confinement time increase in the Madison Symmetric Torus using inductive poloidal current drive. United States. doi:10.2172/434481.
Stoneking, M R, Lanier, N E, Prager, S C, Sarff, J S, and Sinitsyn, D. Sun . "Fivefold confinement time increase in the Madison Symmetric Torus using inductive poloidal current drive". United States. doi:10.2172/434481. https://www.osti.gov/servlets/purl/434481.
@article{osti_434481,
title = {Fivefold confinement time increase in the Madison Symmetric Torus using inductive poloidal current drive},
author = {Stoneking, M R and Lanier, N E and Prager, S C and Sarff, J S and Sinitsyn, D},
abstractNote = {Current profile control is employed in the Madison Symmetric Torus reversed field pinch to reduce the magnetic fluctuations responsible for anomalous transport. An inductive poloidal electric field pulse is applied in the sense to flatten the parallel current profile, reducing the dynamo fluctuation amplitude required to sustain the equilibrium. This technique demonstrates a substantial reduction in fluctuation amplitude (as much as 50%), and improvement in energy confinement (from 1 ms to 5 ms); a record low fluctuation (0.8%) and record high temperature (615 eV) for this device were observed simultaneously during current drive experiments. Plasma beta increases by 50% and the Ohmic input power is three times lower. Particle confinement improves and plasma impurity contamination is reduced. The results of the transient current drive experiments provide motivation for continuing development of steady-state current profile control strategies for the reversed field pinch.},
doi = {10.2172/434481},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}