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Title: Negative current profile measurements in tokamaks using internal Rogowskii coil

Abstract

An internal Rogowskii coil (IRC) has been developed to measure current profiles within SINP tokamak discharges. The present article has highlighted measurements using the IRC in SINP tokamak discharges exhibiting extension in phase after the discharge decays to approximately half its peak value. The IRC current profile results have been compared to that obtained from an internal Langmuir-magnetic probe system and have been observed to measure current profile directly (without employing any reconstruction methods) as well as the localized fluctuations much better than the latter. Interesting observation of negative currents in such Ohmic discharges is reported for the first time. The presence of negative currents has been observed to help in improving the confinement of the discharges. These results are important especially in relation to recent observations of 'current holes', in large fusion devices (such as JET and JT-60U), enhancing confinement properties.

Authors:
;  [1]
  1. Saha Institute of Nuclear Physics, I/AF Bidhannagar, Calcutta 700 064 (India)
Publication Date:
OSTI Identifier:
20778916
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 3; Other Information: DOI: 10.1063/1.2173032; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFINEMENT; CURRENTS; ELECTRIC DISCHARGES; FLUCTUATIONS; JT-60U TOKAMAK; MAGNETIC PROBES; PLASMA; PLASMA DIAGNOSTICS; SINP TOKAMAK

Citation Formats

Narayanan, Ramesh, and Sekar Iyengar, A.N.. Negative current profile measurements in tokamaks using internal Rogowskii coil. United States: N. p., 2006. Web. doi:10.1063/1.2173032.
Narayanan, Ramesh, & Sekar Iyengar, A.N.. Negative current profile measurements in tokamaks using internal Rogowskii coil. United States. doi:10.1063/1.2173032.
Narayanan, Ramesh, and Sekar Iyengar, A.N.. Wed . "Negative current profile measurements in tokamaks using internal Rogowskii coil". United States. doi:10.1063/1.2173032.
@article{osti_20778916,
title = {Negative current profile measurements in tokamaks using internal Rogowskii coil},
author = {Narayanan, Ramesh and Sekar Iyengar, A.N.},
abstractNote = {An internal Rogowskii coil (IRC) has been developed to measure current profiles within SINP tokamak discharges. The present article has highlighted measurements using the IRC in SINP tokamak discharges exhibiting extension in phase after the discharge decays to approximately half its peak value. The IRC current profile results have been compared to that obtained from an internal Langmuir-magnetic probe system and have been observed to measure current profile directly (without employing any reconstruction methods) as well as the localized fluctuations much better than the latter. Interesting observation of negative currents in such Ohmic discharges is reported for the first time. The presence of negative currents has been observed to help in improving the confinement of the discharges. These results are important especially in relation to recent observations of 'current holes', in large fusion devices (such as JET and JT-60U), enhancing confinement properties.},
doi = {10.1063/1.2173032},
journal = {Review of Scientific Instruments},
number = 3,
volume = 77,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}