Experimental investigation of the critical ionization velocity in gas mixtures

Details Experimental investigation of the critical ionization velocity in gas mixtures Experimental investigation of the critical ionization velocity in gas mixtures

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..55..139a&link_type=abstract

Astrophysics and Space Science, vol. 55, no. 1, May 1978, p. 139-146. Research supported by the Statens Rad for Atomforskning.

Astronomy and Astrophysics

Astrophysics

4

Critical Velocity, Gas Ionization, Gas Mixtures, Magnetohydrodynamic Flow, Binary Mixtures, Chemical Composition, Coaxial Plasma Accelerators, Ionization Potentials

Scientific paper

Results are summarized for systematic experiments performed to determine the critical ionization velocity (E/B) for gas mixtures as a function of mixing ratio for several different binary gas mixtures. In the experiments a coaxial plasma gun with an azimuthal magnetic field and a radial discharge current was used to measure E/B for gas-mixture discharge as a function of neutral gas composition (expressed in volume percent). The mixtures studied include three groups: (1) those where the components have roughly the same ionization potential but considerably different molecular or atomic weights (H2-N2, H2-O2, H2-Ar, He-Ne); (2) those where one component has a much larger ionization potential (He-N2, He-O2, He-Ar, H2-He, H2-Ne, Ne-Ar); (3) those where the differences in both molecular or atomic weight and ionization potential are not so great (N2-Ar, O2-Ar). For all mixtures it is found that E/B for any component lies between the values for the pure components, the heavier component dominates in most cases in the first group, the component with the lower ionization potential generally dominates in the second group, and the molecular gases dominate in the third group. Some features of the experimental results are discussed.

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