Journal: Journal of Physics D: Applied Physics

Abbreviation

J. Phys. D: Appl. Phys.

Publisher

IOP Publishing

Journal Volumes

ISSN

0022-3727
1361-6463

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Publications 1 - 10 of 96
  • Experimentally derived rate coefficients for electron ionization, attachment and detachment as well as ion conversion in pure O2 and N2-O2 mixtures
    Item type: Journal Article
    Haefliger, Pascal; Hösl, Andreas; Franck, Christian (2018)
    Journal of Physics D: Applied Physics
  • Spike-driven threshold-based learning with memristive synapses and neuromorphic silicon neurons
    Item type: Journal Article
    Covi, Erika; George, Richard; Frascaroli, Jacopo; et al. (2018)
    Journal of Physics D: Applied Physics
  • Discussion on the mechanism leading to positive synergism in SF6 mixtures with HFO1234ze(E)
    Item type: Journal Article
    Egüz, Eda; Pachin, Juriy; Franck, Christian (2022)
    Journal of Physics D: Applied Physics
    The electric strength in HFO1234ze(E)/SF6 mixtures is investigated with swarm and breakdown experiments. The density-reduced critical electric field as well as the breakdown voltage measured with both techniques, are found to be higher than that of the pure gases in mixtures with more than 10% SF6. The underlying mechanism for the observed positive synergy is investigated and the explanation proposed by Hunter and Christophorou (1985 J. Appl. Phys. 57 4377-85) is discussed for this mixture. The pressure-dependent attachment rate is found to increase with SF6 ratio thus satisfying the main requirement of the proposed mechanism in Hunter and Christophorou's study. It appears nevertheless that due to the fast saturation with pressure and low rates in the mixtures, the three-body attachment processes account only for a small increase in the electric strength. An alternative hypothesis is proposed which considers the strong reduction of electron energies via inelastic processes in HFO1234ze(E), and is qualitatively demonstrated based on measurements and simulations.
  • Ferrocene pixels by laser-induced forward transfer: Towards flexible microelectrode printing
    Item type: Journal Article
    Mitu, Bogdana; Matei, Andreea; Filipescu, Mihaela; et al. (2017)
    Journal of Physics D: Applied Physics
  • Influence of an Sb doping layer in CIGS thin-film solar cells: a photoluminescence study
    Item type: Journal Article
    Puyvelde, L. van; Lauwaert, J.; Pianezzi, F.; et al. (2014)
    Journal of Physics D: Applied Physics
  • Oxygen permeation, mechanical and structural properties of multilayer diffusion barrier coatings on polypropylene
    Item type: Journal Article
    Körner, L.; Sonnenfeld, A.; Heuberger, R.; et al. (2010)
    Journal of Physics D: Applied Physics
  • Photonic and phononic quasicrystals
    Item type: Review Article
    Steurer, Walter; Sutter-Widmer, Daniel (2007)
    Journal of Physics D: Applied Physics
  • Ultrafast magnetization dynamics of antiferromagnetic compounds
    Item type: Journal Article
    Fiebig, Manfred; Duong, Nguyen Phuc; Satoh, Takuya; et al. (2008)
    Journal of Physics D: Applied Physics
  • Study of transient arc properties near current zero in an experimental CO2 high-voltage circuit breaker
    Item type: Journal Article
    Engelbrecht, Joseph T.; Gortschakow, Sergey; Methling, Ralf; et al. (2025)
    Journal of Physics D: Applied Physics
    CO2 has emerged as a leading candidate in the search for a more environmentally friendly alternative to SF6. In high-voltage circuit breakers, where the gas serves as both gaseous insulation and switching medium, commercially available solutions use CO2 either alone or as the primary component of a mixture. In order for breakers to provide the performance necessary to support growing energy demands, a thorough understanding of the transient arc properties of CO2 during the current interruption process is urgently needed. To support these efforts, an experimental puffer circuit breaker has been developed to study thermal interruption in CO2 with a high degree of control, under conditions otherwise comparable to a commercial breaker exposed to short-line fault-like current and voltage stresses. This test setup was used together with high-speed imaging and optical emission spectroscopy (OES) to measure the temporal evolution of a CO2 arc's radial temperature profile in the stagnation region near the instant of current interruption, over a period ranging from −200 μs to 40 μs relative to current zero. A novel diagnostic technique, intensified video optical emission spectroscopy, has been applied for detailed analysis of plasma properties. This technique allows for evaluation of time-dependent temperature decay with microsecond resolution through current zero, which is not possible with OES methods. Results showed little temperature variation more than 50 μs before current zero, with changes in current mainly found to affect the arc cross-section. Fast temperature decay was limited to a period within 20 μs of current zero, when maximum temperatures dropped from 12000K to 7000 K, with a stable temperature near 6000K measurable up to 40 μs after current interruption. The results also revealed the influence of nozzle erosion on the arc temperature profile, showing that new nozzles provide stronger cooling, resulting in a higher temperature, more constricted arc.
  • Pulsed Townsend measurements with mixtures of C4F7N and C5F10O up to 1800 Td
    Item type: Journal Article
    Vemulapalli, Hanut; Franck, Christian (2023)
    Journal of Physics D: Applied Physics
    Effective ionization rate, bulk drift velocity and bulk longitudinal diffusion coefficient for electron swarms in mixtures consisting of either C4F7N or C5F10O in atmospheric gases—CO2, N2 and O2 are measured using a Pulsed Townsend setup. Measurements are carried out between 100 Td and 1800 Td.
Publications 1 - 10 of 96