THE PRE-CUSP PHASE OF TORMAC IV AND V

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An heuristic analysis of the pre-cusp phase of the present Tormac experiments has been carried out. The immediate goal has been to identify the requirements for producing a stabilized pinch in Tormac V qualitatively similar to that in Tormac IV. Concurrently, V has been modified to increase the pinch current and experimental investigation is underway. The experimental procedure is to introduce a toroidal magnetic field into the gas filled chamber. A toroidal electric field is then induced which ionizes the gas; the associated toroidal current simultaneously pinches the discharge. Uncertainty about the details of this process, in particular, about the ... continued below

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19 p.

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Vella, M.C. & Feinberg, B. April 1, 1978.

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Description

An heuristic analysis of the pre-cusp phase of the present Tormac experiments has been carried out. The immediate goal has been to identify the requirements for producing a stabilized pinch in Tormac V qualitatively similar to that in Tormac IV. Concurrently, V has been modified to increase the pinch current and experimental investigation is underway. The experimental procedure is to introduce a toroidal magnetic field into the gas filled chamber. A toroidal electric field is then induced which ionizes the gas; the associated toroidal current simultaneously pinches the discharge. Uncertainty about the details of this process, in particular, about the amount of toroidal flux trapped within the pinch, has led to a one parameter theory. Speculation about the plasma heating mechanism and the subsequent interaction of pinch and cusp is left aside at this time. The chambers are basically rectangular in cross section; but, for simplicity, an equivalent radius is used. Although the experimental discharge probably evolves into a diffuse pinch, a cylindrical sheet pinch model is studied as a first step in understanding the qualitative features of the experiment. A simple Alfven scaling for instability time scales, appropriate for the previous weak pinch and considered in the design of the ringing frequency of the induction circuit is now supplemented by the sheet pinch model. If merited, a more quantitative numerical diffuse pinch model can be developed later. It should be pointed out that cusp confinement, the central problem of the Tormac program, is not addressed here. The goal is simply to identify the requirements for reproducing this particular phase of the Tormac IV experiment.

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19 p.

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  • Report No.: LBL-7569
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/1007488 | External Link
  • Office of Scientific & Technical Information Report Number: 1007488
  • Archival Resource Key: ark:/67531/metadc846329

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • April 1, 1978

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 9:32 p.m.

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Vella, M.C. & Feinberg, B. THE PRE-CUSP PHASE OF TORMAC IV AND V, report, April 1, 1978; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc846329/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.