Investigation of laser blow-off atomic beams by electron impact excitation

J. S. Bakos, I. B. Földes, P. N. Ignácz, G. Kocsis

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Abstract

Electron impact excitation in the edge region of the MT-1 tokamak was used to measure the velocity distribution of a sodium laser blow-off beam in a single shot. The different dependencies of the propagation velocity of the blow-off neutral beam on the laser fluence at different sodium layer thicknesses reveal different regimes of the blow-off process. In the case of thick targets laser ablation is the main accelerating mechanism giving a v∼I1/3 dependence. Thin targets, however, burn through during the laser pulse, and simple thermal heating process results in v∼I1/2 in good agreement with the experiments.

Original languageEnglish
Pages (from-to)1231-1236
Number of pages6
JournalJournal of Applied Physics
Volume69
Issue number3
DOIs
Publication statusPublished - Dec 1 1991

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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