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Title: Air core poloidal magnetic field system for a toroidal plasma producing device

Abstract

A poloidal magnetics system for a plasma producing device of toroidal configuration is provided that reduces both the total volt-seconds requirement and the magnitude of the field change at the toroidal field coils. The system utilizes an air core transformer wound between the toroidal field (TF) coils and the major axis outside the TF coils. Electric current in the primary windings of this transformer is distributed and the magnetic flux returned by air core windings wrapped outside the toroidal field coils. A shield winding that is closely coupled to the plasma carries a current equal and opposite to the plasma current. This winding provides the shielding function and in addition serves in a fashion similar to a driven conducting shell to provide the equilibrium vertical field for the plasma. The shield winding is in series with a power supply and a decoupling coil located outside the TF coil at the primary winding locations. The present invention requires much less energy than the usual air core transformer and is capable of substantially shielding the toroidal field coils from poloidal field flux.

Inventors:
 [1]
  1. Clinton, TN
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
863066
Patent Number(s):
US 4087322
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
air; core; poloidal; magnetic; field; toroidal; plasma; producing; device; magnetics; configuration; provided; reduces; total; volt-seconds; requirement; magnitude; change; coils; utilizes; transformer; wound; tf; major; axis; outside; electric; current; primary; windings; distributed; flux; returned; wrapped; shield; winding; closely; coupled; carries; equal; opposite; provides; shielding; function; addition; serves; fashion; similar; driven; conducting; shell; provide; equilibrium; vertical; series; power; supply; decoupling; coil; located; locations; requires; energy; capable; substantially; plasma current; major axis; field coils; electric current; toroidal plasma; magnetic flux; magnetic field; power supply; toroidal field; located outside; poloidal field; plasma producing; field coil; closely coupled; producing device; poloidal magnetic; primary windings; field flux; primary winding; toroidal configuration; total volt-second; /376/

Citation Formats

Marcus, Frederick B. Air core poloidal magnetic field system for a toroidal plasma producing device. United States: N. p., 1978. Web.
Marcus, Frederick B. Air core poloidal magnetic field system for a toroidal plasma producing device. United States.
Marcus, Frederick B. Sun . "Air core poloidal magnetic field system for a toroidal plasma producing device". United States. https://www.osti.gov/servlets/purl/863066.
@article{osti_863066,
title = {Air core poloidal magnetic field system for a toroidal plasma producing device},
author = {Marcus, Frederick B},
abstractNote = {A poloidal magnetics system for a plasma producing device of toroidal configuration is provided that reduces both the total volt-seconds requirement and the magnitude of the field change at the toroidal field coils. The system utilizes an air core transformer wound between the toroidal field (TF) coils and the major axis outside the TF coils. Electric current in the primary windings of this transformer is distributed and the magnetic flux returned by air core windings wrapped outside the toroidal field coils. A shield winding that is closely coupled to the plasma carries a current equal and opposite to the plasma current. This winding provides the shielding function and in addition serves in a fashion similar to a driven conducting shell to provide the equilibrium vertical field for the plasma. The shield winding is in series with a power supply and a decoupling coil located outside the TF coil at the primary winding locations. The present invention requires much less energy than the usual air core transformer and is capable of substantially shielding the toroidal field coils from poloidal field flux.},
doi = {},
url = {https://www.osti.gov/biblio/863066}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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