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

István Pusztai (Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik) ; Gergö Pokol ; Dániel Dunai ; Dániel Réfy ; Gábor Pór ; Gábor Anda ; S. Zoletnik ; Josef Schweinzer
Review of Scientific Instruments (0034-6748). Vol. 80 (2009), 8, p. 083502.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: fusion plasma, beam emission spectroscopy, plasma diagnostics, tokamak, density measurement

Article Number: 083502

Denna post skapades 2009-11-19. Senast ändrad 2015-07-28.
CPL Pubid: 101909


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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Icke-linjär elektrodynamik (2005-2010)



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