Modelling of Field-Reversed Configuration Experiment with Large Safety Factor

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The Translation-Confinement-Sustainment facility has been operated in the 'translation-formation' mode in which a plasma is ejected at high-speed from a {theta}-pinch-like source into a confinement chamber where it settles into a field-reversed-configuration state. Measurements of the poloidal and toroidal field have been the basis of modeling to infer the safety factor. It is found that the edge safety factor exceeds two, and that there is strong forward magnetic shear. The high-q arises because the large elongation compensates for the modest ratio of toroidal-to-poloidal field in the plasma. This is the first known instance of a very high-{beta} plasma with a ... continued below

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Steinhauer, L; Guo, H; Hoffman, A; Ishida, A & Ryutov, D D November 28, 2005.

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The Translation-Confinement-Sustainment facility has been operated in the 'translation-formation' mode in which a plasma is ejected at high-speed from a {theta}-pinch-like source into a confinement chamber where it settles into a field-reversed-configuration state. Measurements of the poloidal and toroidal field have been the basis of modeling to infer the safety factor. It is found that the edge safety factor exceeds two, and that there is strong forward magnetic shear. The high-q arises because the large elongation compensates for the modest ratio of toroidal-to-poloidal field in the plasma. This is the first known instance of a very high-{beta} plasma with a safety factor greater than unity. Two-fluid modeling of the measurements also indicate several other significant features: a broad 'transition layer' at the plasma boundary with probable line-tying effects, complex high-speed flows, and the appearance of a two-fluid minimum-energy state in the plasma core. All these features may contribute to both the stability and good confinement of the plasma.

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PDF-file: 13 pages; size: 0.6 Mbytes

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  • Journal Name: Physics of Plasmas, vol. 13, no. 5, May 24, 2006, pp. 056119

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  • Report No.: UCRL-JRNL-217364
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 894784
  • Archival Resource Key: ark:/67531/metadc891158

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  • November 28, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 8:26 p.m.

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Steinhauer, L; Guo, H; Hoffman, A; Ishida, A & Ryutov, D D. Modelling of Field-Reversed Configuration Experiment with Large Safety Factor, article, November 28, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc891158/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.