Authors: S.J. Zweben, D.P. Stotler
Abstract: Gas puff imaging (GPI) is a diagnostic of
plasma turbulence which uses a puff of neutral gas at the plasma
edge to increase the local visible light emission for improved
space-time resolution of plasma fluctuations. This paper reviews
gas puff imaging diagnostics of edge plasma turbulence in magnetic
fusion research, with a focus on the instrumentation, diagnostic
cross-checks, and interpretation issues. The gas puff imaging
hardware, optics, and detectors are described for about 10 GPI
systems implemented over the past ~15 years. Comparison of GPI
results with other edge turbulence diagnostic results are
described and many common features are observed. Several issues in
the interpretation of GPI measurements are discussed, and
potential improvements in hardware and modeling are suggested.
Submitted to: Review of Scientific Instruments
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