Atomic Hydrogen Densities in Expanding Thermal Plasmas

POSTER

Abstract

A cascaded arc produced hydrogen plasma expansion was studied by means of two photon absorption laser induced fluorescence (TALIF). In a weakly magnetised jet (up to 40 mT) a characteristic colour change from red to blue has been reported earlier. Particularly the intense plasma background radiation at the detected fluorescence transition ($H_\alpha $ line) hampers the application of a straightforward TALIF detection setup. Therefore a gated photomultiplier tube was used to measure and compare the TALIF signals under non- and weakly magnetised conditions. Results of the axial and radial H densities will be presented.

Authors

  • S. Welzel

    • Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • P.A.C. van Zon

    • Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • R.A.J.M. van den Bos

    • Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • W.E.N. van Harskamp

    • Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • D.C. Schram

    • Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • R.A.H. Engeln

    • Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands