Bulletin of the American Physical Society
64th Annual Gaseous Electronics Conference
Volume 56, Number 15
Monday–Friday, November 14–18, 2011; Salt Lake City, Utah
Session CT1: High Pressure Discharges I |
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Chair: Deborah O'Connell, Univerity of York Room: 255D |
Tuesday, November 15, 2011 8:00AM - 8:30AM |
CT1.00001: Streamers and their applications Invited Speaker: In this invited lecture we give an overview of our 15 years of experience on streamer plasma research. Efforts are directed to integrating the competence areas of plasma physics, pulsed power technology and chemical processing. The current status is the development of a large scale pulsed corona system for gas treatment. Applications on biogas conditioning, VOC removal, odor abatement and control of traffic emissions have been demonstrated. Detailed research on electrical and chemical processes resulted in a boost of efficiencies. Energy transfer efficiency to the plasma was raised to above 90{\%}. Simultaneous improvement of the plasma chemistry resulted in a highly efficient radical generation: O-radical production up to 50{\%} of the theoretical maximum has been achieved. A major challenge in pulsed power driven streamers is to unravel, understand and ultimately control the complex interactions between the transient plasma, electrical circuits, and process. Even more a challenge is to yield electron energies that fit activation energies of the process. We will discuss our ideas on adjusting pulsed power waveforms and plasma reactor settings to obtain more controlled catalytic processing: the ``Chemical Transistor'' concept.\\[4pt] Work done in collaboration with E.J.M. van Heesch, W.F.L.M. Hoeben, S.J. Voeten, T. Huiskamp, J. Zhang, and F.J.C.M. Beckers (now with Oranjewoud/HMVT, Ede, The Netherlands), Eindhoven University of Technology; and the Electrical Energy Systems Team. [Preview Abstract] |
Tuesday, November 15, 2011 8:30AM - 9:00AM |
CT1.00002: Nanosecond Pulse Discharges and Fast Ionization Wave Discharges: Fundamental Kinetic Processes and Applications Invited Speaker: Over the last two decades, nanosecond pulse discharges and Fast Ionization Wave (FIW) discharges have been studied extensively, both theoretically and experimentally. Current interest in characterization of these discharges is driven mainly by their potential for applications such as plasma chemical fuel reforming, plasma-assisted combustion, high-speed flow control, pumping of electric discharge excited lasers, and generation of high-energy electrons. A unique capability of FIW discharges to generate significant ionization and high concentrations of excited species at high pressures and over large distances, before ionization instabilities have time to develop, is very attractive for these applications. Recent advances in laser optical diagnostics offer an opportunity of making non-intrusive, spatially and time-resolved measurements of electron density and electric field distributions in high-speed ionization wave discharges, on nanosecond time scale. Insight into FIW formation and propagation dynamics also requires development of predictive kinetic models, and their experimental validation. Although numerical kinetic models may incorporate detailed kinetics of charged and neutral species in the propagating ionization wave front (including non-local electron kinetics), analytic models are also attractive due to their capability of elucidating fundamental trends of discharge development. The talk gives an overview of recent progress in experimental characterization and kinetic modeling of nanosecond pulse and fast ionization wave discharges in nitrogen and air over a wide range of pulse repetition rates, 0.1-40 kHz. FIW discharge plasmas sustained at high pulse repetition rates are diffuse and volume filling, with most of the power coupled to the plasma behind the wave, at E/N=200-300 Td and energy loading of 1-2 meV/molecule/pulse. The results demonstrate significant potential of large volume, diffuse, high pulse repetition rate FIW discharges for novel plasma chemical applications. [Preview Abstract] |
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