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P: Fachverband Plasmaphysik

P 17: Poster Session - Helmholtz Graduate School for Plasma Physics

P 17.6: Poster

Mittwoch, 19. März 2014, 16:30–18:30, SPA Foyer

Upgrade of the Edge Charge Exchange System at the ASDEX Upgrade tokamak — •Marco Cavedon, Thomas Puetterich, Eleonora Viezzer, and ASDEX Upgrade Team — Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Boltzmannstraße 2, D-85748 Garching

The edge charge exchange recombination spectroscopy (CXRS) system at ASDEX Upgrade has been upgraded. Time and spatial resolution have been increased in order to study fast phenomenas. First measurements of ion temperature, rotational velocity and impurity density with the new system are presented.

Three new optical heads have been installed looking toroidally at the plasma edge increasing the total line of sights (LOSs) from 8 to 33. Moreover, the existing poloidal head has been refurbished with 22 LOSs instead of 8. The radial coverage is 5 times wider than the pedestal region while the radial resolution is below one fourth of it. The upgrade of both systems allows detailed profiles to be measured at each timepoint and therefore to study fast transient events.

A new lens-based Czerny-Turner like spectrometer (f = 2.8) has been designed. Making use of an interference filter, it is now possible to arrange more spectra in a limited area of the CCD camera chip. This allows to run up to 9 channels at 25 µs (= 40 kHz) exposure time (standard resolution: 2.3 ms). However, the actual time resolution is limited by the signal intesity. External impurity seeding is planned to be used in order to reach the best compromise between signal to noise ratio and measurements speed.