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Title: Solenoid-free Plasma Startup in NSTX using Coaxial Helicity Injection

Abstract

The favorable properties of the Spherical Torus (ST) arise from its very small aspect ratio. However, small aspect ratio devices have very restricted space for a substantial central solenoid. Thus methods for initiating the plasma current without relying on induction from a central solenoid are essential for the viability of the ST concept. Coaxial Helicity Injection (CHI) is a promising candidate for solenoid-free plasma startup in a ST. Recent experiments on the HIT-II ST at the University of Washington, have demonstrated the capability of a new method, referred to as transient CHI, to produce a high quality, closed-flux equilibrium that has then been coupled to induction, with a reduced requirement for transformer flux [R. Raman, T.R. Jarboe, B.A. Nelson, et al., Phys. Rev. Lett. 90 (February 2003) 075005-1]. An initial test of this method on the National Spherical Torus Experiment (NSTX) has produced about 140 kA of toroidal current. Modifications are now underway to improve capability for transient CHI in NSTX.

Authors:
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Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
836595
Report Number(s):
PPPL-4042
TRN: US0500698
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 3 Jan 2005
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASPECT RATIO; ELECTRIC CURRENTS; HELICITY; INDUCTION; MODIFICATIONS; PLASMA; SOLENOIDS; TRANSFORMERS; TRANSIENTS; VIABILITY; CURRENT DRIVE; MAGNETIC RECONNECTION; SPHERICAL TORUS

Citation Formats

Roger Raman, Thomas R. Jarboe, Michael G. Bell, Dennis Mueller, Brian A. Nelson, Benoit LeBlanc, Charles Bush, Masayoshi Nagata, and Ted Biewer. Solenoid-free Plasma Startup in NSTX using Coaxial Helicity Injection. United States: N. p., 2005. Web. doi:10.2172/836595.
Roger Raman, Thomas R. Jarboe, Michael G. Bell, Dennis Mueller, Brian A. Nelson, Benoit LeBlanc, Charles Bush, Masayoshi Nagata, & Ted Biewer. Solenoid-free Plasma Startup in NSTX using Coaxial Helicity Injection. United States. doi:10.2172/836595.
Roger Raman, Thomas R. Jarboe, Michael G. Bell, Dennis Mueller, Brian A. Nelson, Benoit LeBlanc, Charles Bush, Masayoshi Nagata, and Ted Biewer. Mon . "Solenoid-free Plasma Startup in NSTX using Coaxial Helicity Injection". United States. doi:10.2172/836595. https://www.osti.gov/servlets/purl/836595.
@article{osti_836595,
title = {Solenoid-free Plasma Startup in NSTX using Coaxial Helicity Injection},
author = {Roger Raman and Thomas R. Jarboe and Michael G. Bell and Dennis Mueller and Brian A. Nelson and Benoit LeBlanc and Charles Bush and Masayoshi Nagata and Ted Biewer},
abstractNote = {The favorable properties of the Spherical Torus (ST) arise from its very small aspect ratio. However, small aspect ratio devices have very restricted space for a substantial central solenoid. Thus methods for initiating the plasma current without relying on induction from a central solenoid are essential for the viability of the ST concept. Coaxial Helicity Injection (CHI) is a promising candidate for solenoid-free plasma startup in a ST. Recent experiments on the HIT-II ST at the University of Washington, have demonstrated the capability of a new method, referred to as transient CHI, to produce a high quality, closed-flux equilibrium that has then been coupled to induction, with a reduced requirement for transformer flux [R. Raman, T.R. Jarboe, B.A. Nelson, et al., Phys. Rev. Lett. 90 (February 2003) 075005-1]. An initial test of this method on the National Spherical Torus Experiment (NSTX) has produced about 140 kA of toroidal current. Modifications are now underway to improve capability for transient CHI in NSTX.},
doi = {10.2172/836595},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 03 00:00:00 EST 2005},
month = {Mon Jan 03 00:00:00 EST 2005}
}

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