Heating of on-axis plasma heating for keV x-ray production with z-pinches

Alexandre S. Chuvatin, Leonid I. Rudakov, Alexander L. Velikovich, Jack Davis, Vladimir I. Oreshkin

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We discuss a new opportunity of using Z-pinch plasma radiation sources for generating Ar K-shell radiation and harder keV quanta. Our approach to keV X-ray generation is based upon an analogy with laser fusion, where the imploding shell compressionally heats the low-density inner mass. The suggested design of a Z-pinch load consists then of one or two heavy outer shell(s) with a lower mass on-axis fill (i.e., central gas jet) producing most of the radiation. The outer shell is not supposed to radiate and thus does not need to have high specific energy characterized by the large η parameter (Whitney et al., 1990). Thus, the heavy outer shell does not need to have a very large initial diameter for its implosion to be matched to the long-pulse current driver. Rather, we want to have a large amount of energy from the driver coupled to this shell by the moment when the shell collides with the low-density fill and eventually converts much of this energy to the thermal energy of the on-axis plasma. This configuration is investigated numerically in the framework of a one-dimensional radiation-magneto-hydrodynamics model for the case of Ar K-shell radiators. It is demonstrated that the Ar fill is heated in two stages. The first stage corresponds to the shock heating and thermal conduction in an initially low-density fill, and it allows preheating the fill while avoiding significant losses in soft radiation. The fill radiator is then compressed quasi-adiabatically and is heated-up to the temperature optimum for K-shell quanta generation. Diffusion of the driving magnetic field is shown to always suppress the conductive heat losses from the hot on-axis plasma to the cold outer shell. Absorption of the K-lines emitted near the axis in the surrounding plasma could be avoided by filling the outer shell with a different gas (like N-on-Ar), which allows a substantial increase in the observed keV X-ray radiation yields.

Original languageEnglish
Pages (from-to)739-751
Number of pages13
JournalIEEE Transactions on Plasma Science
Volume33
Issue number2 II
DOIs
Publication statusPublished - 1 Apr 2005
Externally publishedYes

Fingerprint

plasma heating
heating
radiation
radiators
x rays
shock heating
plasma radiation
heat
laser fusion
K lines
gas jets
implosions
radiation sources
thermal energy
energy
hydrodynamics
moments
conduction
configurations
pulses

Keywords

  • K-shell radiation production
  • Magnetohydrodynamics
  • Plasma radiation sources
  • Z-pinch plasmas

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Heating of on-axis plasma heating for keV x-ray production with z-pinches. / Chuvatin, Alexandre S.; Rudakov, Leonid I.; Velikovich, Alexander L.; Davis, Jack; Oreshkin, Vladimir I.

In: IEEE Transactions on Plasma Science, Vol. 33, No. 2 II, 01.04.2005, p. 739-751.

Research output: Contribution to journalArticle

Chuvatin, Alexandre S. ; Rudakov, Leonid I. ; Velikovich, Alexander L. ; Davis, Jack ; Oreshkin, Vladimir I. / Heating of on-axis plasma heating for keV x-ray production with z-pinches. In: IEEE Transactions on Plasma Science. 2005 ; Vol. 33, No. 2 II. pp. 739-751.
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