Aachen PK 2003 – scientific programme

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P: Plasmaphysik

P 17: Poster III

P 17.16: Poster

Thursday, March 20, 2003, 17:30–19:15, Foyer

Ion Temperature Measurements in the Torsatron TJ-K — •V. Senger, F. Greiner, and U. Stroth — IEAP, Christian Albrechts Universität zu Kiel, 24098 Kiel, Germany

The TJ-K torsarton is operated with a toroidal low-temperature plasma in stellerator geometry. Plasma is produced with a helicon heating system (2 kW@27.12 MHz). As standard diagnostics Langmuir probes are used to get spatial informations about electron temperature and density. For a typical Argon gas pressure of 10⁻³ mbar and a magnetic field of 0.2 T densities of 7× 10¹⁸ m⁻³ and electron temperatures up to 15 eV are found. However, the value of the ion temperature, which determines important quantities like Lamor radius and collisionality, is not known yet.

The topic of this work is the design of a diagnostic for ion temperature measurement via emission spectroscopy. For Helium as a working gas the resolution of a 2 m-Czerny-Turner Spectrometer is sufficient to get an accurate measurement of the doppler broadening even for ion temperatures of 0.03 eV. In addition the measurement of drift velocities is planned.