Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 9: Diagnostics I

P 9.8: Vortrag

Dienstag, 3. März 2015, 12:50–13:05, HZO 30

Thomson Scattering Diagnostic at PSI-2 — •Michael Hubeny¹, Bernd Schweer¹, Uwe Czarnetzki², Dirk Luggenhölscher², and Bernhard Unterberg¹ — ¹Institute of Energy and Climate Research, FZ Jülich GmbH, 52425 Jülich — ²Institute for Plasma and Atomic Physics, Ruhr-University Bochum, 44780 Bochum

Linear plasma devices are widely used to investigate fundamental plasma dynamics and plasma surface interactions. Processes involved in these interactions possess strong dependencies on plasma temperature and density, while turbulent, intermittent transport in the plasma edge region additionally complicates measuring plasma parameters. Thomson scattering represents a direct measurement of electron density and temperature via light scattering. PSI-2 is equipped with a Nd:YAG Laser with an energy per pulse of up to 1J at 532nm and a triple grating spectrometer, optimized for high efficiency and stray light suppression, can measure radially resolved spectra. Since the plasma exposures generally last several hours, the integration time is adjustable to achieve a higher accuracy. The short laser pulse duration and camera gating time of <10ns offer the possibility to observe plasma dynamics with an appropriate shot-to-shot selection method, which will be discussed. Furthermore, fast camera measurements show turbulent plasma structures in the far plasma edge, in which no significant background plasma is measured. Therefore, all scattered light from plasma is expected to originate from these turbulent structures. First Thomson scattering measurements on PSI-2 will be shown.