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Deconvolution-based correction of alkali beam emission spectroscopy density profile measurements

Authors :
Gabor Por
Gergö Pokol
S. Zoletnik
J. Schweinzer
D. I. Refy
Daniel Dunai
G. Anda
Istvan Pusztai
Source :
Review of Scientific Instruments, Review of Scientific Instruments, v.80 (2009)
Publication Year :
2009
Publisher :
AIP Publishing, 2009.

Abstract

A deconvolution-based correction method of the beam emission spectroscopy (BES) density profile measurement is demonstrated by its application to simulated measurements of the COMPASS and TEXTOR tokamaks. If the line of sight is far from tangential to the flux surfaces, and the beam width is comparable to the scale length on which the light profile varies, the observation may cause an undesired smoothing of the light profile, resulting in a non-negligible underestimation of the calculated density profile. This effect can be reduced significantly by the emission reconstruction method, which gives an estimate of the emissivity along the beam axis from the measured light profile, taking the finite beam width and the properties of the measurement into account in terms of the transfer function of the observation. Characteristics and magnitude of the mentioned systematic error and its reduction by the introduced method are studied by means of the comprehensive alkali BES simulation code RENATE.

Details

ISSN :
10897623 and 00346748
Volume :
80
Database :
OpenAIRE
Journal :
Review of Scientific Instruments
Accession number :
edsair.doi.dedup.....4d8a4f182a61cddc2f7510a53add235a
Full Text :
https://doi.org/10.1063/1.3205930