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P: Plasmaphysik

P 7: Dusty Plasmas, Diagnostics III

P 7.7: Vortrag

Donnerstag, 5. April 2001, 18:10–18:25, 2032

Lyman series lines of He ii measured in a gas-liner pinch — •Thomas Wrubel, Stefan Seidel, Stefan Büscher, Hans-Joachim Kunze, and Sandrine Ferri — Institute for Experimental Physics, Ruhr-University-Bochum, 44780 Bochum, Germany

We present measurements of the Lyman series of He ii in a gas-liner pinch device at n_e = 1 − 4 × 10¹⁸ cm⁻³ and k_B T_e= 5 − 15 eV, where the plasma is independently diagnosed by Thomson scattering. Synthetic spectra are calculated using the Frequency Fluctuation Model where the level population is provided by the FLY code. Intensity ratios and Stark broadening of the lines (L_α - L_є) are experimentally and theoretically investigated. We find good agreement between experimental and calculated intensity ratios and Stark widths for the Lyman-γ, Lyman-δ and Lyman-є transitions, the Lyman-α and Lyman-β transitions suffer under radiation transport.