Determining how magnetic helicity injection really works. Annual progress report

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Magnetic helicity injection is the essential process underlying both spheromak formation and helicity injection toroidal current drive in tokamaks (e.g., HIT and NSTX). The dynamical details of the helicity injection process are poorly understood because existing models avoid a dynamic description. In particular, Taylor relaxation, the main model motivating helicity injection efforts, is an argument that predicts the state to which a turbulent magnetic configuration relaxes after all dynamics are over. The goal of the Caltech experiment is to investigate the actual dynamics and topological evolution associated with relaxation and so determine how helicity injection really works. Although the global ... continued below

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3 p.

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Bellan, P.M. October 21, 1998.

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Description

Magnetic helicity injection is the essential process underlying both spheromak formation and helicity injection toroidal current drive in tokamaks (e.g., HIT and NSTX). The dynamical details of the helicity injection process are poorly understood because existing models avoid a dynamic description. In particular, Taylor relaxation, the main model motivating helicity injection efforts, is an argument that predicts the state to which a turbulent magnetic configuration relaxes after all dynamics are over. The goal of the Caltech experiment is to investigate the actual dynamics and topological evolution associated with relaxation and so determine how helicity injection really works. Although the global relaxation model (i.e., Taylor model) typically invokes axisymmetry, simple physical arguments (Cowling`s theorem) show that the detailed dynamics must involve topologically complex, non-axisymmetric processes. Progress for this project is given here.

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3 p.

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INIS; OSTI as DE99000109

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  • Other Information: PBD: 21 Oct 1998

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  • Other: DE99000109
  • Report No.: DOE/ER/54461--T1
  • Grant Number: FG03-98ER54461
  • DOI: 10.2172/674820 | External Link
  • Office of Scientific & Technical Information Report Number: 674820
  • Archival Resource Key: ark:/67531/metadc703780

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  • October 21, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 20, 2017, 3:55 p.m.

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Bellan, P.M. Determining how magnetic helicity injection really works. Annual progress report, report, October 21, 1998; Pasadena, California. (digital.library.unt.edu/ark:/67531/metadc703780/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.