Limits on m = 2, n = 1 error field induced locked mode instability in TPX with typical sources of poloidal field coil error field and a prototype correction coil, ``C-coil``

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Description

Irregularities in the winding or alignment of poloidal or toroidal magnetic field coils in tokamaks produce resonant low m, n = 1 static error fields. Otherwise stable discharges can become nonlinearly unstable, and locked modes can occur with subsequent disruption when subjected to modest m = 2, n = 1 external perturbations. Using both theory and the results of error field/locked mode experiments on DIII-D and other tokamaks, the critical m = 2, n = 1 applied error field for locked mode instability in TPX is calculated for discharges with ohmic, neutral beam, or rf heating. Ohmic discharges axe predicted ... continued below

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21 p.

Creation Information

La Haye, R. J. December 1, 1992.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

Irregularities in the winding or alignment of poloidal or toroidal magnetic field coils in tokamaks produce resonant low m, n = 1 static error fields. Otherwise stable discharges can become nonlinearly unstable, and locked modes can occur with subsequent disruption when subjected to modest m = 2, n = 1 external perturbations. Using both theory and the results of error field/locked mode experiments on DIII-D and other tokamaks, the critical m = 2, n = 1 applied error field for locked mode instability in TPX is calculated for discharges with ohmic, neutral beam, or rf heating. Ohmic discharges axe predicted to be most sensitive, but even co-injected neutral beam discharges (at {beta}{sub N} = 3) in TPX will require keeping the relative 2, 1 error field (B{sub r21}/B{sub T}) below 2 {times} 10{sup {minus}4}. The error fields resulting from ``as-built`` alignment irregularities of various poloidal field coils are computed. Coils if well-designed must be positioned to within 3 mm with respect to the toroidal field to keep the total 2,1 error field within limits. Failing this, a set of prototype correction coils is analyzed for use in bringing 2,1 error field down to a tolerable level.

Physical Description

21 p.

Notes

OSTI; NTIS; INIS; GPO Dep.

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  • Other Information: PBD: Dec 1992

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  • Other: DE93014408
  • Report No.: GA-A--21167
  • Grant Number: AC03-89ER51114
  • DOI: 10.2172/10158869 | External Link
  • Office of Scientific & Technical Information Report Number: 10158869
  • Archival Resource Key: ark:/67531/metadc1385178

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Creation Date

  • December 1, 1992

Added to The UNT Digital Library

  • Nov. 28, 2018, 2:33 p.m.

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  • Feb. 11, 2019, 1:14 p.m.

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La Haye, R. J. Limits on m = 2, n = 1 error field induced locked mode instability in TPX with typical sources of poloidal field coil error field and a prototype correction coil, ``C-coil``, report, December 1, 1992; San Diego, California. (https://digital.library.unt.edu/ark:/67531/metadc1385178/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.