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K: Fachverband Kurzzeitphysik
K 3: Licht- und Strahlungsquellen II und deren Anwendungen
K 3.5: Vortrag
Montag, 12. März 2012, 17:45–18:00, V57.04
Recent Studies on Vacuum Ultraviolet Radiation Generated during Pulsed Atmospheric Breakdown in Air — •Klaus Frank1,2, George Laity1, Andrew Fierro1, Lynn Hatfield1, Andreas Neuber1, and Magne Kristiansen1 — 1Center for Pulsed Power and Power Electronics — 2Erlangen Centre for Astroparticle Physics Department of Physics Friedrich - Alexander University Erlangen - Nürnberg 91058 Erlangen, Germany
This paper describes recent experiments to quantify the emission and re-absorption of vacuum ultraviolet (VUV) radiation during the streamer phase of pulsed atmospheric breakdown. Specific interest exists for determining the role this radiation has on the photo-ionization physics which are believed to dominate the feedback streamer process. A surface discharge configuration was constructed of point-point electrodes near a MgF2 dielectric surface. The diagnostics package includes multiple vacuum monochromators, VUV sensitive photomultipliers, fast-shutter intensified CCD cameras (VUV/VIS), fast-risetime Rogowski current monitors, and optically isolated high voltage probes. Spatially and temporally resolved spectroscopy in the wavelength range 115 * 175 nm resulted in a number of critical observations for atomic species of NI and OI. Radiation in the VUV range is primarily emitted during the streamer phase before voltage collapse, and the source of VUV radiation is not stationary. Estimates of streamer electron density are made via Stark broadening measurements. Self-absorption of some emission is observed, and quantifications are underway which will elucidate the physics of VUV radiation transport.