Bulletin of the American Physical Society
63rd Annual Gaseous Electronics Conference and 7th International Conference on Reactive Plasmas
Volume 55, Number 7
Monday–Friday, October 4–8, 2010; Paris, France
Session SF1: Lighting |
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Chair: Valery Godyak, RF Plasma Consulting, Brookline USA Room: Petit Amphitheatre |
Friday, October 8, 2010 8:30AM - 9:00AM |
SF1.00001: Discharge lamps: current challenges, perspectives and threats Invited Speaker: In Europe, the incandescent lamp is currently being phased out, and the halogen lamp is likely to follow soon. The successors of these inefficient light sources are discharge lamps and LEDs. It has become fashionable to consider discharge lamps as ``old fashioned'' and LEDs as ``modern.'' However, there are application areas where it will take a long time before LED actually can take over from discharge lamps, if that ever happens. Especially when a lot of light is required in a point source, LEDs suffer from the requirement that their temperature does not exceed certain values. At present, both low pressure plasmas (fluorescent tubes and compact fluorescent lamps) and high pressure plasmas (HID lamps and UHP lamps) are used for lighting applications. Most of these lamps contain mercury. The challenges that discharge lamp scientists, as ever, face are: the elimination of mercury, increasing the color rendering index, solving the hot re-strike problem in high pressure lamps, and increasing the luminous efficacy. In this presentation we will give a few examples of recent research in these directions, and we will speculate on the perspectives of discharge lamp science. [Preview Abstract] |
Friday, October 8, 2010 9:00AM - 9:15AM |
SF1.00002: The analysis of OIL with EDSOG on two-dimensional gas-dynamic model Alexander Chukalovsky, Konstantin Klopovsky, Tatyana Rakhimova, Yuri Mankelevich, Olga Proshina At present intensive investigations on developing the effective electric discharge singlet oxygen generator (EDSOG) for oxygen-iodine laser (OIL) are carried out. For the last five years the gain and laser power have been increased about 80 times from the moment of the first demonstration of generation due to improvement of EDSOG using transverse RF-discharge (81 MHz). But to date there is a problem of low efficiency ($\le $1{\%}) of energy transfer from SO to iodine atoms in this system. The detailed analysis of the processes in OIL with EDSOG influencing on gain and gas temperature was performed on developed two-dimensional self-consistent gas-dynamic model with detailed chemistry for subsonic flow case. The simulations were in good agreement with experimental data. The goal of this work was to find optimal conditions for the continuous regime for the OIL with EDSOG utilized in at pressure P=10 Torr.. [Preview Abstract] |
Friday, October 8, 2010 9:15AM - 9:30AM |
SF1.00003: VUV-Emission from an Electron-Beam-Sustained Radiofrequency Discharge Thomas Dandl, Thomas Heindl, Reiner Kruecken, Jochen Wieser, Andreas Ulrich Electron beams with a low particle energy of 12~keV are coupled into dense gases using extremely thin (300nm) silicon nitride entrance-foils [1]. This allows a compact, table-top setup avoiding the hard x-rays. Pre-ionization caused by the electrons is used to start an additional radiofrequency (rf) discharge in the dense gas. The optical emission from such an electron beam sustained discharge in noble gases is dominated by the so-called second excimer continuum in the vacuum-ultraviolet wavelength range [2]. Modifications of the VUV emission spectra which can be observed in the rf-discharge will be presented for the case of argon and krypton. The appearance of a broad-band continuum in the visible spectral range was also observed. Systematic studies and preliminary interpretations of the observed effects as well as potential applications of the setup for VUV light sources will be described. \\[4pt] [1] A. Ulrich et al., Eur. Phys. J. Appl. Phys. \textbf{47}, 22815 (2009) \\[0pt] [2] A. Morozov et al., J. Appl. Phys. \textbf{103} (2008) 103301 [Preview Abstract] |
Friday, October 8, 2010 9:30AM - 9:45AM |
SF1.00004: Mass spectrometry of security relevant substances via soft photo ionization using vacuum ultraviolet light sources Andreas Ulrich, Ralf Zimmermann, Jochen Wieser Mass spectrometry as a sensitive and selective method for chemical diagnostics is used for detecting security relevant substances such as explosives and illicit drugs. A novel concept of soft single photon ionization with innovative excimer light sources, emitting in the vacuum ultraviolet, is used in the spectrometer's (MS) ion source. Low energy electron beams (LEEB) are used to induce the excimer emission of argon and krypton excimer molecules which emit around 127 and 150~nm, respectively. The VUV light from the brilliant light source is focused into the ion source of an ion trap MS. Combination of the essentially fragment-free ionization method and a MS/MS technique leads to very sensitive and highly selective detection of the relevant substances. The technology of the collaborative research project which includes also special endoscopic sampling techniques will be described, with a focus on the LEEB light and plasma sources. [Preview Abstract] |
Friday, October 8, 2010 9:45AM - 10:00AM |
SF1.00005: Superradiance in self-absorbed emission lines from high intensity discharge lamps Dimitrios Karabourniotis, Emmanouel Drakakis For most high intensity discharge (HID) arc lamps much of the radiation comes from reversal regions of self-absorbed spectral lines. In these lines an enhancement of the spectral radiance was observed at the vicinity of the transition frequency using high resolution spectroscopy and the measured values are much higher than those calculated assuming a source function that decreases monotonically with the distance to the arc axis. This superradiance within the central wavelength region of the line was successfully simulated by a local increase of the source function within the arc plasma mantle. Self-reversed lines emitted from metal halide discharge (MHD) lamps as well as from high pressure pure mercury lamps were investigated. The numerical results of the spectral line radiance are in good agreement with the experimental spectroscopic results. The origin of the superradiance can be justified by the presence of an additional source of radiation caused by non-equilibrium plasma effects such as nonradiative excitation transfer and photodissociation of metal halide molecules. [Preview Abstract] |
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