Coil Tolerance Impact on Plasma Surface Quality for NCSX

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Description

The successful operation of the National Compact Stellarator Experiment (NCSX) machine will require producing plasma configurations with good flux surfaces, with a minimum volume of the plasma lost to magnetic islands or stochastic regions. The project goal is to achieve good flux surfaces over 90% of the plasma volume. NCSX is a three period device designed to be operated with iota ranging from {approx}0.4 on axis to {approx}0.7 at the edge. The field errors of most concern are those that are resonant with 3/5 and 3/6 modes (for symmetry preserving field errors) and the 1/2 and 2/3 modes (for symmetry ... continued below

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840 Kilobytes pages

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Brooks, Art & Reiersen, Wayne October 20, 2003.

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Description

The successful operation of the National Compact Stellarator Experiment (NCSX) machine will require producing plasma configurations with good flux surfaces, with a minimum volume of the plasma lost to magnetic islands or stochastic regions. The project goal is to achieve good flux surfaces over 90% of the plasma volume. NCSX is a three period device designed to be operated with iota ranging from {approx}0.4 on axis to {approx}0.7 at the edge. The field errors of most concern are those that are resonant with 3/5 and 3/6 modes (for symmetry preserving field errors) and the 1/2 and 2/3 modes (for symmetry breaking field errors). In addition to losses inherent in the physics configuration itself, there will be losses from field errors arising from coil construction and assembly errors. Some of these losses can be recovered through the use of trim coils or correction coils. The impact of coil tolerances on plasma surface quality is evaluated herein for the NCSX design. The methods used in this evaluation are discussed. The ability of the NCSX trim coils to correct for field errors is also examined. The results are used to set coils tolerances for the various coil systems.

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840 Kilobytes pages

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INIS; OSTI as DE00820107

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  • Other Information: PBD: 20 Oct 2003

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  • Report No.: PPPL-3885
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/820107 | External Link
  • Office of Scientific & Technical Information Report Number: 820107
  • Archival Resource Key: ark:/67531/metadc737625

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  • October 20, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 8:32 p.m.

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Brooks, Art & Reiersen, Wayne. Coil Tolerance Impact on Plasma Surface Quality for NCSX, report, October 20, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc737625/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.