Aachen PK 2003 – wissenschaftliches Programm
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P: Plasmaphysik
P 4: Poster I
P 4.30: Poster
Montag, 17. März 2003, 17:45–19:15, Foyer
Time resolved 2D Doppler imaging of the W7-AS divertor plasma using a MOSS spectrometer — •Jinil Chung1, Ralf Koenig1, N. Ramasubramanian1, Thomas Klinger1, and John Howard2 — 1Max-Plank-Institute for Plasma Physics, EURATOM-Ass., D-17491 Greifswald, Germany — 2Plasma Research Laboratory, Australian National University, Canberra, 0200, Australia
The island divertor in stellarators is inherently asymmetrical in the poloidal and toroidal direction, creates a complete 3-dimensional (3D) structure. To explore the complicated 3D structural physics, many 2-dimensional (2D) spectroscopy based diagnostics were installed in the W7-AS divertor region. We have newly constructed the first 2D MOSS spectrometer using a high-resolution 2D CCD camera to study the 468.6 nm He II line emissions from the divertor region in the W7-AS. To construct this, we have also created a coherence simulation code and its proper model. The simulation code provides a very effective way to find a suitable isolated line among the candidate lines. The suitability of such a system as a possible W7-X divertor diagnostic was tested. We have taken measurements at the end of the W7-AS experimental campaign which will allow us to derive the He II ion temperature distribution across an entire divertor module.