Aachen PK 2003 – wissenschaftliches Programm

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P: Plasmaphysik

P 17: Poster III

P 17.26: Poster

Donnerstag, 20. März 2003, 17:30–19:15, Foyer

A new MSE diagnostic setup in TEXTOR — •Katarzyna Jakubowska and Roger Jaspers — FOM-Instituut voor Plasmafysica ’Rijnhuizen’, Association EURATOM-FOM,

Plasma is confined inside the tokamak by the external poloidal and toroidal magnetic field. The helicity of the magnetic field lines is described by the safety factor q. This q plays an important role in confinement issues of the plasma like instabilities, ITB’s, MHD effect etc. The Motional Stark Effect (MSE) diagnostic was developed to measure locally this q values. Fast neutral hydrogen atoms injected into the tokamak emit the Balmer-α line. The spectral features or the polarisation of the light can resolve the q values.

This paper presents the new designed MSE setup installed on TEXTOR. Here, from the intensity ratio between the π and σ components the safety factor is revealed. Preliminary measurements will be shown.

Because the proposed measurement scheme is not a polarisation measurement it is not affected by optical changes in the properties, due to for instance deposition on vessel mirrors or windows. This might have some beneficial implications for an ITER-MSE design.