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Development of the gas-puff imaging diagnostic in the TEXTOR tokamak

Gas puff imaging (GPI) [S. J. Zweben, D. P. Stotler et al., Phys. Plasmas 9, 1981 (2002); R. J. Maqueda, G. A. Wurden et al., Rev. Sci. Instrum. 74, 2020 (2003)] is a powerful diagnostic that permits a two-dimensional measurement of turbulence in the edge region of a fusion plasma and is based on th...

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Published in:Review of scientific instruments 2013-05, Vol.84 (5), p.053501-053501
Main Authors: Shesterikov, I, Xu, Y, Berte, M, Dumortier, P, Van Schoor, M, Vergote, M, Schweer, B, Van Oost, G
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container_title Review of scientific instruments
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creator Shesterikov, I
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Van Oost, G
description Gas puff imaging (GPI) [S. J. Zweben, D. P. Stotler et al., Phys. Plasmas 9, 1981 (2002); R. J. Maqueda, G. A. Wurden et al., Rev. Sci. Instrum. 74, 2020 (2003)] is a powerful diagnostic that permits a two-dimensional measurement of turbulence in the edge region of a fusion plasma and is based on the observation of the local emission of a neutral gas, actively puffed into the periphery of the plasma. The developed in-vessel GPI telescope observes the emission from the puffed gas along local (at the puff) magnetic field lines. The GPI telescope is specially designed to operate in severe TEXTOR conditions and can be treated as a prototype for the GPI systems on next generation machines. Also, the gas puff nozzle is designed to have a lower divergence of the gas flow than previous GPI diagnostics. The resulting images show poloidally and radially propagating structures, which are associated with plasma blobs. We demonstrate that the local gas puff does not disturb plasma properties. Our results indicate also that the neutral gas emission intensity is more sensitive to the electron density than the electron temperature. Here, we present implementation details of the GPI system on TEXTOR and discuss some design and diagnostic issues related to the development of GPI systems in general.
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subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DESIGN
ELECTRON DENSITY
ELECTRON TEMPERATURE
EMISSION
GAS FLOW
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MAGNETIC FIELDS
NOZZLES
PLASMA DIAGNOSTICS
TELESCOPES
TEXTOR TOKAMAK
TURBULENCE
TWO-DIMENSIONAL CALCULATIONS
title Development of the gas-puff imaging diagnostic in the TEXTOR tokamak
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