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Title: Coil Tolerance Impact on Plasma Surface Quality for NCSX

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
820107
Report Number(s):
PPPL-3885
TRN: US0305684
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 20 Oct 2003
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFIGURATION; CONSTRUCTION; DESIGN; EVALUATION; MAGNETIC ISLANDS; MAGNETIC SURFACES; PHYSICS; PLASMA; STELLARATORS; SYMMETRY; SYMMETRY BREAKING; TOLERANCE; MAGNETICS

Citation Formats

Art Brooks, and Wayne Reiersen. Coil Tolerance Impact on Plasma Surface Quality for NCSX. United States: N. p., 2003. Web. doi:10.2172/820107.
Art Brooks, & Wayne Reiersen. Coil Tolerance Impact on Plasma Surface Quality for NCSX. United States. doi:10.2172/820107.
Art Brooks, and Wayne Reiersen. Mon . "Coil Tolerance Impact on Plasma Surface Quality for NCSX". United States. doi:10.2172/820107. https://www.osti.gov/servlets/purl/820107.
@article{osti_820107,
title = {Coil Tolerance Impact on Plasma Surface Quality for NCSX},
author = {Art Brooks and Wayne Reiersen},
abstractNote = {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.},
doi = {10.2172/820107},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 20 00:00:00 EDT 2003},
month = {Mon Oct 20 00:00:00 EDT 2003}
}

Technical Report:

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