Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 40, Issue 7, Pages 2026-2032Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/40/7/026
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Pulsed laser probing using Moire deflectometry and Normaski interferometry was performed simultaneously to diagnose the electron density in a wire z-pinch plasma. The Moire deflectometer has a higher sensitivity while the Nomarski interferometer is able to probe higher densities. The advantages of each technique permitted us to measure a wider range of densities. This includes the low-density coronal plasma with density of an order of magnitude lower (10(16) cm(-3)) than that which can be measured by interferometry. Furthermore, our optical probing presents a low response to mechanical vibrations as it is not necessary to use a separate reference beam as in a Mach-Zehnder interferometer. The experiments were performed on a 160 kA current generator at Imperial College, London, for three different discharge configurations in order to study the initial resistive heating stage of the wire z-pinch.
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