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Title: Flexible helical-axis stellarator

Abstract

An 1=1 helical winding which spirals about a conventional planar, circular central conductor of a helical-axis stellarator adds a significant degree of flexibility by making it possible to control the rotational transform profile and shear of the magnetic fields confining the plasma in a helical-axis stellarator. The toroidal central conductor links a plurality of toroidal field coils which are separately disposed to follow a helical path around the central conductor in phase with the helical path of the 1=1 winding. This coil configuration produces bean-shaped magnetic flux surfaces which rotate around the central circular conductor in the same manner as the toroidal field generating coils. The additional 1=1 winding provides flexible control of the magnetic field generated by the central conductor to prevent the formation of low-order resonances in the rotational transform profile which can produce break-up of the equilibrium magnetic surfaces. Further, this additional winding can deepen the magnetic well which together with the flexible control provides increased stability.

Inventors:
 [1];  [2];  [1];  [1];  [1]
  1. (Oak Ridge, TN)
  2. (Abingdon, GB2)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
866557
Patent Number(s):
4735765
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
flexible; helical-axis; stellarator; helical; winding; spirals; conventional; planar; circular; central; conductor; adds; significant; degree; flexibility; control; rotational; transform; profile; shear; magnetic; fields; confining; plasma; toroidal; links; plurality; field; coils; separately; disposed; follow; path; phase; coil; configuration; produces; bean-shaped; flux; surfaces; rotate; manner; generating; additional; provides; generated; prevent; formation; low-order; resonances; produce; break-up; equilibrium; deepen; increased; stability; provides increased; field generating; central conductor; field coils; magnetic flux; magnetic field; magnetic fields; toroidal field; field coil; field generated; axis stellarator; central circular; rotational transform; configuration produces; increased stability; helical winding; flux surface; helical path; generating coils; helical-axis stellarator; coil configuration; /376/

Citation Formats

Harris, Jeffrey H., Hender, Timothy C., Carreras, Benjamin A., Cantrell, Jack L., and Morris, Robert N. Flexible helical-axis stellarator. United States: N. p., 1988. Web.
Harris, Jeffrey H., Hender, Timothy C., Carreras, Benjamin A., Cantrell, Jack L., & Morris, Robert N. Flexible helical-axis stellarator. United States.
Harris, Jeffrey H., Hender, Timothy C., Carreras, Benjamin A., Cantrell, Jack L., and Morris, Robert N. Fri . "Flexible helical-axis stellarator". United States. https://www.osti.gov/servlets/purl/866557.
@article{osti_866557,
title = {Flexible helical-axis stellarator},
author = {Harris, Jeffrey H. and Hender, Timothy C. and Carreras, Benjamin A. and Cantrell, Jack L. and Morris, Robert N.},
abstractNote = {An 1=1 helical winding which spirals about a conventional planar, circular central conductor of a helical-axis stellarator adds a significant degree of flexibility by making it possible to control the rotational transform profile and shear of the magnetic fields confining the plasma in a helical-axis stellarator. The toroidal central conductor links a plurality of toroidal field coils which are separately disposed to follow a helical path around the central conductor in phase with the helical path of the 1=1 winding. This coil configuration produces bean-shaped magnetic flux surfaces which rotate around the central circular conductor in the same manner as the toroidal field generating coils. The additional 1=1 winding provides flexible control of the magnetic field generated by the central conductor to prevent the formation of low-order resonances in the rotational transform profile which can produce break-up of the equilibrium magnetic surfaces. Further, this additional winding can deepen the magnetic well which together with the flexible control provides increased stability.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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