We find that neutral density fluctuations affect the D_α emission. A diagnostic neutral gas puff on the low-field side midplane is included and the impact of neutral density fluctuations on D_α light emission investigated.
The simulation couples self-consistently the drift-reduced two-fluid Braginskii equations to a kinetic equation for neutral atoms. Impact of neutral density fluctuations on gas puff imaging diagnosticsĪ three-dimensional turbulence simulation of the SOL and edge regions of a toroidally limited tokamak is carried out. During a discharge, neutral helium or deuterium gas is puffed at the edge of the plasma through a rectangular multi\ HL-2A teamĪ new gas puff imaging (GPI) diagnostic has been developed on the HL-2A tokamak to study two-dimensional plasma edge turbulence in poloidal vs.
P.ĭevelopment of a new gas puff imaging diagnostic on the HL-2A tokamak Here, several issues in the interpretation of GPI measurements are discussed, and potential improvements in hardware and modeling are suggested.« less Comparison of GPI results with other edge turbulence diagnostic results is described, and many common featuresmore » are observed. The gas puff imaging hardware, optics, and detectors are described for about 10 GPI systems implemented over the past similar to 15 years. 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. 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.
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices