Andreas Hösl

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Hösl

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Andreas

ORCID

0000-0001-8682-3750

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Publications 1 - 10 of 16

Swarm parameter measurement in hydrogen, considering secondary photonic electron emission
Hösl, Andreas; Franck, Christian (2018)
arXiv
Discharges in hydrogen at pressures above $1\,$kPa and a reduced electric field of $E/N=100-200\,$Td show a characteristic current oscillation in Pulsed Townsend experiments. This is explained by secondary emission of electrons from the photo-cathode: some hundreds of nano-seconds after the laser-pulse that released the initial $10^4-10^6$ primary electrons, secondary electrons are emitted from the cathode. Mechanisms discussed in literature are UV-emission from neutral molecules, emission by positive ions reaching the cathode, and back-scattering of excited neutrals. For an E/N range up to $500\,$Td and pressures up to $2\,$kPa we model different sources, and agree with previous findings that the observed secondary emission is purely due to ultra-violet light below $200\,$Td: the simulation fits with the complex oscillating waveform. Obtained swarm parameters agree well with the literature. Our findings suggest a very high efficiency of the photo-cathode for UV light of energies above $8\,$eV.
Electrical insulation properties of the perfluoronitrile C4F7N
Chachereau, Alise; Hösl, Andreas; Franck, Christian (2018)
Journal of Physics D: Applied Physics
A proposal of new environmental friendly gases for the use in electrical insulation application, II
Egüz, Eda; Hösl, Andreas; Pachin, Juriy; et al. (2019)
Electrical insulation properties of the perfluoroketone C5F10O
Chachereau, Alise; Hösl, Andreas; Franck, Christian (2018)
Journal of Physics D: Applied Physics
Measurements of Swarm Parameters in C4F7N:O2:CO2, C5F10O:O2:CO2 and C5F10O:O2:N2 Mixtures
Egüz, Eda; Chachereau, Alise; Hösl, Andreas; et al. (2019)
Proceedings of the 21st International Symposium on High Voltage Engineering
Measurements of the electron swarm parameters of R1225ye(Z) (C3HF5) and its mixtures with N2 and CO2
Pachin, Juriy; Hösl, Andreas; Franck, Christian (2019)
Journal of Physics D: Applied Physics
A proposal of new environmental friendly gases for the use in electrical insulation application
Hösl, Andreas; Pachin, Juriy; Chachereau, Alise; et al. (2018)
Measurement of ionization, attachment, detachment and charge transfer rate coefficients in dry air around the critical electric field
Hösl, Andreas; Häfliger, Pascal; Franck, Christian (2017)
Journal of Physics D: Applied Physics
Experimentally derived rate coefficients for electron ionization, attachment and detachment as well as ion conversion in pure O2 and N2-O2 mixtures
Haefliger, Pascal; Hösl, Andreas; Franck, Christian (2018)
Journal of Physics D: Applied Physics
Perfluoro-1,3-dioxolane and Perfluoro-oxetane: promising gases for electrical insulation
Hösl, Andreas; Pachin, Juriy; Chachereau, Alise; et al. (2018)
Journal of Physics D: Applied Physics
Perfluorinated cyclic ethers represent an interesting class of molecules to use as dielectric gases for electrical insulation. Measurements of the two compounds 4,4,5,5-Tetrachloro-2,2-difluoro-1,3-dioxolane (c-C3Cl4F2O2, CAS 87075-01-2) and Octafluoro-1,4-dioxane (c-C4F8O2, CAS 32981-22-9) in a Pulsed Townsend Experiment are presented, their ionization and attachment rate coefficients are obtained and their electron attachment cross sections are estimated. Both gases have a high critical electric field strength of about 3.5 and 1.3 times the strength of SF6, respectively, which is presumably due to very high electron attachment cross sections in the range from 2-4 eV. In particular, for c-C3Cl4F2O2 the values appear to be very close to the S-wave scattering limit around 3 eV. Based on these results, we recommend the two analogous compounds Perfluoro-1,3-dioxolane (c-C3F6O2, CAS 21297-65-4) and Perfluoro-oxetane (c-C3F6O, CAS 425-82-1) for further research for the use as insulation and refrigerant gases, since they are chemically comparable and have high vapor pressures.

Publications 1 - 10 of 16

Andreas Hösl

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