Aachen PK 2003 – wissenschaftliches Programm

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P: Plasmaphysik

P 7: Plasma Diagnostics

P 7.3: Vortrag

Dienstag, 18. März 2003, 16:10–16:30, FO1

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, transport barriers, MHD effects etc. The Motional Stark Effect (MSE) diagnostic was developed to measure locally these q values. Fast hydrogen atoms injected into the tokamak emit Balmer-α light. The spectral features or the polarisation of this 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 changes in the optical properties, due to for instance deposition on vessel mirrors or windows. Some beneficial implications for an ITER-MSE design will be discussed.