Conveners
Theory and Simulation 2 - Plasma: part 1
- Yinon Ashkenazy (The Hebrew University of Jerusalem (IL))
Theory and Simulation 2 - Plasma: part 2
- Flyura Djurabekova (University of Helsinki)
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Matthew Hopkins (Sandia National Laboratories)06/11/2013, 11:00Christopher H. Moore, Matthew M. Hopkins, Jeremiah J. Boerner, Paul S. Crozier, Stan G. Moore The study of arc discharge often begins with Paschen’s analysis of breakdown processes under a number of assumptions. These assumptions are usually not valid in practice. We investigate changes to breakdown voltage when violating the assumption of uniform background gas.Go to contribution page
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Stefan Anton Parviainen (Helsinki Institute of Physics (HIP))06/11/2013, 11:30I will talk about how the sputtering yield of Cu is increased in the presence of an electric field. The sputtering yield is important from the point of view of the plasma formation, and we need to be able to explain where all the neutral atoms are coming from that are needed for the plasma. The sputtering yield is used as an input parameter for e.g. the PIC simulations, so it's good to...Go to contribution page
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Mikhail Tsventoukh06/11/2013, 12:00M. M Tsventoukh, G.A.Mesyats and S.A.Barengolts The vacuum discharge implies a formation of plasma from the electrode material for a large current transfer. It consists of three stages - vacuum breakdown, vacuum spark, and final - vacuum arc. The basic feature of all these stages - explosive electron emission (EEE) pulses - ectons that arise from microcenters at the cathode and are...Go to contribution page
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Michael Keidar (George Washington University)07/11/2013, 09:00We will present the state of the art modeling approach to describe the plasma (primarily interelectrode) of the vacuum arc. The model is based on the free boundary plasma expansion. The character of the plasma expansion depends on the anode geometries (disk anode, ring anode, and small anode relatively to the expanding plasma). Peculiarities of the high-current vacuum arc will be discussed....Go to contribution page
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Kyrre Ness Sjobaek (University of Oslo (NO))07/11/2013, 09:30A full arc cycle (ignition-growth-steady-state-extinction) is simulated using the particle-in-cell (PIC) code ArcPic2D. The model features electrons, singly charged ions, and neutrals which are tracked in a rotational symmetric geometry with 2 position components and 3 velocity components between two parallel plates. Modelled interactions are long range electrostatic fields (PIC), coulomb...Go to contribution page
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Dmitry Shmelev (Institute of Electrophysics RAS)07/11/2013, 10:00A 1D PIC/DSMC model was developed to simulate the near-cathode layer of plasma with the parameters typical for plasma of vacuum arc cathode spot. The model takes into account the main types of inelastic and elastic collisions (including the coulomb one) of particles in the plasma as well as evaporation and thermo-field electron emission from the cathode. A wide range of characteristics of the...Go to contribution page
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Mrunal Parekh07/11/2013, 11:00A better understanding of vacuum arc is essential in current breaking vacuum switches. There are multiple process involved during the arcing process not limited to 1) Explosive emission from cathode surfaces due to thermal runaway and effect of space charges 2) influence of particles 3) influence of anode in case of high current arc 4) modification of contact surface. In order to incorporate...Go to contribution page
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Matthew Hopkins (Sandia National Laboratories)07/11/2013, 11:30Matthew M. Hopkins, Jeremiah J. Boerner, Christopher H. Moore, Paul S. Crozier, Stan G. Moore, Matthew T. Bettencourt, Russell Hooper The spatial, temporal, and model capability demands for simulating vacuum arc discharges are enormous. The simulation must evolve from an initial collisionless vacuum (or near vacuum) state through a sputtering phase with surface interaction and low...Go to contribution page