Anomalous resistivity of high-Z plasma with hydrogen admixture

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Among microinstabilities that may affect the resistance of a Z>>1 plasma in fast Z pinches, are the ion acoustic and the lower hybrid instabilities. We discuss effects of hydrogen ions on these instabilities and find that, by properly adjusting the hydrogen concentration, one can considerably increase the threshold current density for the onset of the instability. In addition to a strong Landau damping on hydrogen ions; there is a collisional stabilizing mechanism related to a collisional friction between the two ion species. Another interesting aspect of the stability analysis is related to the fact that the magnetization (a product of ... continued below

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Ryutov, D.D. & Toor, A. November 6, 1998.

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Among microinstabilities that may affect the resistance of a Z>>1 plasma in fast Z pinches, are the ion acoustic and the lower hybrid instabilities. We discuss effects of hydrogen ions on these instabilities and find that, by properly adjusting the hydrogen concentration, one can considerably increase the threshold current density for the onset of the instability. In addition to a strong Landau damping on hydrogen ions; there is a collisional stabilizing mechanism related to a collisional friction between the two ion species. Another interesting aspect of the stability analysis is related to the fact that the magnetization (a product of the gyrofrequency and the collisional frequency) of the heavy ions and the hydrogen ions is very different. We discuss possible ways of adding the hydrogen to high-Z material. This is simple in case of gas-puff pinches, where the hydrogen could be added to the main gas before the puffing. For the wire arrays, one might try to saturate th e assembled array by hydrogen prior to the main discharge. One more possibility is using interwoven thin wires of a main component (say, tungsten) and polymer.

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1.8 Megabytes pages

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  • 40th Annual Meeting of the American Physical Society Division of Plasma Physics, New Orleans, LA (US), 11/15/1998--11/20/1998

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  • Report No.: UCRL-JC-132401
  • Report No.: DP0102012
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 2849
  • Archival Resource Key: ark:/67531/metadc669817

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  • November 6, 1998

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  • June 29, 2015, 9:42 p.m.

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  • May 5, 2016, 9:03 p.m.

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Ryutov, D.D. & Toor, A. Anomalous resistivity of high-Z plasma with hydrogen admixture, article, November 6, 1998; California. (digital.library.unt.edu/ark:/67531/metadc669817/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.