Deconvolution-based correction of alkali beam emission spectroscopy density profile measurements
Artikel i vetenskaplig tidskrift, 2009

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.

density measurement

tokamak

beam emission spectroscopy

plasma diagnostics

fusion plasma

Författare

Istvan Pusztai

Chalmers, Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik

Gergö Pokol

Budapest University of Technology and Economics

Dániel Dunai

MTA KFKI RMKI

Dániel Réfy

Budapest University of Technology and Economics

Gábor Pór

Budapest University of Technology and Economics

Gábor Anda

MTA KFKI RMKI

S. Zoletnik

MTA KFKI RMKI

Josef Schweinzer

Max Planck-institutet

Review of Scientific Instruments

0034-6748 (ISSN)

Vol. 80 083502-

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1063/1.3205930