Publications

2022

• Dielectric Barrier Discharge in CO2: electrical and optical characterization
  
  • Bajon Corentin
  • Dap Simon
  • Belinger Antoine
  • Guaitella Olivier
  • Hoder Tomas
  • Naudé Nicolas
  , 2022. In the past ten years, studies on CO2 have known a growing interest [1] [2]. Among them, CO2 recycling [3], design of spacecraft shields for atmosphere re-entry, or oxygen production [4] [5] in the frame of the future Mars missions are of major concern. Non-equilibrium plasmas are an excellent way to induce chemistry in gases. At atmospheric pressure, dielectric barrier discharges (DBD) are widely used to generate cold plasmas, avoiding the transition to the arc regime. Usually, at this pressure, DBDs are filamentary and homogeneous DBD are only reported for few gas compositions such as Nitrogen or noble gases (Ar, He, Ne) with a Penning admixture. In this work, we will present the very first results obtained in a homogeneous dielectric barrier discharge at atmospheric pressure in pure CO2.
• Plasmas for in situ resource utilization on Mars: Fuels, life support, and agriculture
  
  • Guerra V.
  • Silva T.
  • Pinhão N.
  • Guaitella O.
  • Guerra-Garcia C.
  • Peeters F.
  • Tsampas M.
  • van de Sanden M.
  Journal of Applied Physics, American Institute of Physics, 2022, 132 (7). This work discusses the potential of combining non-thermal plasmas and conducting membranes for in situ resource utilization (ISRU) on Mars. By converting different molecules directly from the Martian atmosphere, plasmas can create the necessary feed-stock and base chemicals for processing fuels, breathing oxygen, building materials, and fertilizers. Different plasma sources operate according to different principles and are associated with distinct dominant physicochemical mechanisms. This diversity allows exploring different energy transfer pathways leading to CO2 dissociation, including direct electron-impact processes, plasma chemistry mediated by vibrationally and electronically excited states, and thermally driven dissociation. The coupling of plasmas with membranes is still a technology under development, but a synergistic effect between plasma decomposition and oxygen permeation across conducting membranes is anticipated. The emerging technology is versatile, scalable, and has the potential to deliver high rates of production of molecules per kilogram of instrumentation sent to space. Therefore, it will likely play a very relevant role in future ISRU strategies. (10.1063/5.0098011)
  DOI : 10.1063/5.0098011
• Investigation of the impact of NRP discharge frequency on the ignition of a lean methane-air mixture using fully coupled plasma-combustion numerical simulations
  
  • Barleon N.
  • Cheng L.
  • Cuenot B.
  • Vermorel O.
  • Bourdon A.
  Proceedings of the Combustion Institute, Elsevier, 2022. (10.1016/j.proci.2022.07.046)
  DOI : 10.1016/j.proci.2022.07.046
• Third and Fourth Harmonics of Electromagnetic Emissions by a Weak Beam in a Solar Wind Plasma with Random Density Fluctuations
  
  • Krafft C.
  • Savoini P.
  The Astrophysical Journal Letters, Bristol : IOP Publishing, 2022, 934 (2), pp.L28. Abstract Electromagnetic emissions  3 and  4 at the third and fourth harmonics of the plasma frequency ω p were observed during the occurrence of type II and type III solar radio bursts. Two-dimensional particle-in-cell simulations are performed using a weak beam, high space and time resolutions, and a plasma with density fluctuations of a few percent, for parameters relevant to regions of type III bursts. For the first time, a detailed study of the different wave coalescence processes involved in the generation of  3 and  4 waves is presented and the impact of density fluctuations on the wave interaction mechanisms is demonstrated. Energy ratios between the second, third, and fourth harmonics  2 ,  3 , and  4 are consistent with space observations. It is shown that, in both homogeneous and inhomogeneous plasmas, the dominant processes generating  3 (  4 ) are the coalescence of  2 (  3 ) with a Langmuir wave, in spite of the random density fluctuations modifying the waves’ resonance conditions by energy transport in the wavevector space and of the damping of Langmuir waves. The role of the backscattered (forward-propagating) Langmuir waves coming from the first (second) cascade of the electrostatic decay of beam-driven Langmuir waves is determinant in these processes. Understanding such wave coalescence mechanisms can provide indirect information on Langmuir and ion acoustic wave turbulence, the average level of density inhomogeneities, and suprathermal electron fluxes generated in solar wind regions where the harmonics manifest. Causes for the rarity of their observations are discussed. (10.3847/2041-8213/ac7f28)
  DOI : 10.3847/2041-8213/ac7f28
• On electric field measurements based on intensity ratio of 1 − and 2 + systems of nitrogen in discharges with high specific deposited energy
  
  • Lepikhin N D
  • Popov N A
  • Starikovskaia S M
  Plasma Sources Science and Technology, IOP Publishing, 2022. Analysis of optical emission spectroscopy (OES) in application to the measurements of the electric field has been performed for the nanosecond capillary discharge in molecular nitrogen at moderate gas pressure at high specific energy deposition. Significant discrepancy between results of electric field measurements by OES technique and capacitive probe measurements is demonstrated. Decay rates of excited species as well as rotation structure of corresponding optical transitions are used to identify possible population/depopulation channels of the N+2 (B2Σ+u ) andN2(C3Πu) states. Kinetic calculations taking into account additional quenching of the N+2 (B2Σ+u ) andN2(C3Πu) states by electrons, additional population of N+2 (B2Σ+u ) by electron impact from the ground state of the molecular ion and by a reaction of excited N2(A3Σ+u ) with the ground state of N+2 describes adequately behavior of experimentally measured emission of both considered systems.
• A regularized high-order moment model to capture non-Maxwellian electron energy distribution function effects in partially ionized plasmas
  
  • Alvarez Laguna Alejandro
  • Esteves B.
  • Bourdon A.
  • Chabert P.
  Physics of Plasmas, American Institute of Physics, 2022, 29 (8), pp.083507. A model for electrons in partially ionized plasmas that self-consistently captures non-Maxwellian electron energy distribution function (EEDF) effects is presented. The model is based on the solution of scalar and vectorial velocity moments up to the contracted fourth-order moment. The set of fluid (macroscopic) equations is obtained with Grad's method and exact expressions for the collision production terms are derived, considering the electron–electron, electron–gas, and electron–ion elastic collisions as well as for electron–gas excitation and ionization collisions. A regularization of the equations is proposed in order to avoid spurious discontinuities, existing in the original Grad's moment model, by using a generalized Chapman–Enskog expansion that exploits the disparity of mass between the electrons and the heavy particles (ions and atoms) as well as the disparity of plasma and gas densities, typical of gas discharges. The transport model includes non-local effects due to spatial gradients in the EEDF as well as the impact of the EEDF in the calculation of the elastic and inelastic collision rates. Solutions of the moment model under spatially homogeneous conditions are compared to direct simulation Monte Carlo and a two-term Boltzmann solver under conditions that are representative of high plasma density discharges at low-pressure. The moment model is able to self-consistently capture the evolution of the EEDF, in good quantitative agreement with the kinetic solutions. The calculation of transport coefficients and collision rates of an argon plasma in thermal non-equilibrium under the effect of an electric field is in good agreement with the solutions of a two-term Boltzmann solver, largely improving models with a simplified Bhatnagar–Gross–Krook collisional operator. (10.1063/5.0095019)
  DOI : 10.1063/5.0095019
• Dynamic Interfaces in Contact with Atmospheric-Pressure Plasmas: Laser Diagnostics and Interactions
  
  • Pai David Z
  , 2022.
• Modeling the Solar Wind Turbulent Cascade Including Cross Helicity: With and Without Expansion
  
  • Grappin Roland
  • Verdini Andrea
  • Müller W-C
  The Astrophysical Journal, American Astronomical Society, 2022, 933. Simulations of the turbulent cascade forming in the solar wind, including cross helicity, commonly adopt a homogeneous setup, not taking into account wind expansion. Here we want to assess the predictions of decaying 3D compressible (low Mach number) MHD simulations, respectively homogeneous and with expansion, in order to examine which is the most fruitful approach to understanding the turbulent cascade in the solar wind. We follow turbulent evolution during 10 nonlinear turnover times, considering several initial values of the initial spectral slope and cross helicity. In the expanding case, the transverse sizes of the plasma volume are stretched by a factor of 5 during the simulation, corresponding to traveling from 0.2 up to 1 au. In homogeneous simulations, the relative cross helicity rises, and the Elsässer spectra E ± show "pinning," with a steep dominant spectrum and flat subdominant spectrum, the final spectral indices depending on cross helicity but not initial indices. With expansion, the relative cross helicity decreases, and dominant and subdominant spectra share the same index, with the index relaxing to an asymptotic value that generally depends on the initial index. The absence of pinning, as well as the decrease of relative cross helicity, probably both rely on the permanent injection by expansion of an excess of magnetic energy at the largest scales, equivalent to injecting subdominant energy. Also, spectra generally steepen when initially starting flatter than k −5/3 but stop evolving at a finite time/distance. (10.3847/1538-4357/ac6ba4)
  DOI : 10.3847/1538-4357/ac6ba4
• Recherche et outils en météorologie de l'espace
  
  • Masson Sophie
  , 2022.
• The 2022 Plasma Roadmap: low temperature plasma science and technology
  
  • Adamovich I
  • Agarwal S
  • Ahedo E
  • Alves L L
  • Baalrud S
  • Babaeva N
  • Bogaerts A
  • Bourdon A
  • Bruggeman P J
  • Canal C
  • Choi E H
  • Coulombe S
  • Donkó Z
  • Graves D B
  • Hamaguchi S
  • Hegemann D
  • Hori M
  • Kim H-H
  • Kroesen G M W
  • Kushner M J
  • Laricchiuta A
  • Li X
  • Magin T E
  • Mededovic Thagard S
  • Miller V
  • Murphy A B
  • Oehrlein G S
  • Puac N
  • Sankaran R M
  • Samukawa S
  • Shiratani M
  • Šimek M
  • Tarasenko N
  • Terashima K
  • Thomas Jr E
  • Trieschmann J
  • Tsikata S
  • Turner M M
  • van der Walt I J
  • van de Sanden M C M
  • von Woedtke T
  Journal of Physics D: Applied Physics, IOP Publishing, 2022, 55 (37), pp.373001. The 2022 Roadmap is the next update in the series of Plasma Roadmaps published by Journal of Physics D with the intent to identify important outstanding challenges in the field of low-temperature plasma (LTP) physics and technology. The format of the Roadmap is the same as the previous Roadmaps representing the visions of 41 leading experts representing 21 countries and five continents in the various sub-fields of LTP science and technology. In recognition of the evolution in the field, several new topics have been introduced or given more prominence. These new topics and emphasis highlight increased interests in plasma-enabled additive manufacturing, soft materials, electrification of chemical conversions, plasma propulsion, extreme plasma regimes, plasmas in hypersonics, data-driven plasma science and technology and the contribution of LTP to combat COVID-19. In the last few decades, LTP science and technology has made a tremendously positive impact on our society. It is our hope that this roadmap will help continue this excellent track record over the next 5–10 years. (10.1088/1361-6463/ac5e1c)
  DOI : 10.1088/1361-6463/ac5e1c
• Numerical challenges in the simulation of 1D bounded low-temperature plasmas with charge separation in various collisional regimes
  
  • Reboul Louis
  • Massot Marc
  • Laguna Alejandro Alvarez
  , 2022, pp.190004. We study a 1D geometry of a plasma confined between two conducting floating walls with applications to laboratory plasmas. These plasmas are characterized by a quasi-neutral bulk that is joined to the wall by a thin boundary layer called sheath that is positively charged. Although analytical solutions are available in the sheath and the pre-sheath, joining the two areas by one analytical solution is still an open problem which requires the numerical resolution of the fluid equations coupled to Poisson equation. Current numerical schemes use high-order discretizations to correctly capture the electron current in the sheath, presenting unsatisfactory results in the boundary layer and they are not adapted to all the possible collisional regimes. In this work, we identify the main numerical challenges that arise when attempting the simulations of such configuration and we propose explanations for the observed phenomena via numerical analysis. We propose a numerical scheme with controlled diffusion as well as new discrete boundary conditions that address the identified issues. (10.1063/5.0187483)
  DOI : 10.1063/5.0187483
• Interplay between magnetic braking and turbulent stress tensor regarding plasma flow
  
  • Varennes R
  • Gendrih P
  • Vermare L.
  • Garbet X
  • Sarazin Y
  • Grandgirard V
  • Dif- Pradalier G
  • Donnel P
  • Peret M
  , 2022.
• Climatology of global, hemispheric and regional electron content variations during the solar cycles 23 and 24
  
  • Younas Waqar
  • Amory-Mazaudier Christine
  • Khan Majid
  • Amaechi Paul O
  Advances in Space Research, Elsevier, 2022. We present the results of study on the variations of ionospheric total electron content (TEC) by using global, hemispheric, and regional electron contents computed from the global ionospheric maps (GIMs) for the period from 1999 to 2020. For a low and moderate solar activity, the global and regional electron contents vary linearly with solar 10.7 cm radio flux and EUV flux. While a saturation effect in the electron content verses EUV and F10.7 is found during the high solar activity periods at all regions, the maximum effect is observed at low-latitudes followed by high and mid-latitudes region. The extent of saturation effect is more pronounced for F10.7 as compared to EUV. A wavelet transform is applied to global and hemispheric electron contents to examine the relative strength of different variations. The semi-annual variations dominate in the northern hemisphere, whereas annual variations dominate in the southern counterpart. The amplitude of annual variations in southern hemisphere is found to be higher than northern counterpart at all latitudes. This asymmetry in the amplitude of annual variation is maximum at low-latitudes, followed by mid and high-latitudes, respectively. The semi-annual variations are in-phase in both hemisphere and follow the solar cycle. The northern hemisphere depicts relatively large amplitude of semi-annual variations and exhibit the maximum effect at high-latitudes. (10.1016/j.asr.2022.07.029)
  DOI : 10.1016/j.asr.2022.07.029
• Relaxation of electronic excitation in nitrogen/oxygen and fuel/air mixtures: fast gas heating in plasma-assisted ignition and flame stabilization
  
  • Popov N.A.
  • Starikovskaia S.M.
  Progress in Energy and Combustion Science, Elsevier, 2022, 91, pp.100928. Fast gas heating (FGH) is an abrupt increase in gas temperature in non-equilibrium low-temperature plasma due to relaxation of electronically excited states of atoms and molecules. In the active flow control, fast gas heating is responsible for thermal frequency perturbations in the range of unstable frequencies of flow instabilities. In plasma assisted combustion, abrupt temperature increase due to FGH, together with generation of radicals in plasma, induces acceleration of combustion chemistry providing shortening of the induction delay time and intensification of combustion. Over the last decade, significant progress has been made towards the understanding of kinetics of the fast gas heating. New observations of fast gas heating in air and nitrogen/oxygen mixtures have been reported. The result of experiments, reporting heating to thousands of kelvins during tens of nanoseconds at atmospheric pressure in noncombustible mixtures, have provided new opportunities in the development of kinetic models. Electron-impact dissociation, quenching of electronically excited states of atoms and molecules, ion-molecular reactions, recombination of charged particles are reviewed analysing their role in the fast gas heating. The fraction of energy spent on fast gas heating η_R has been suggested as a universal parameter to generalize the results of empirical research on energy relaxation. This paper considers the dependence of η_R on reduced electric field, specific delivered energy, oxygen fraction in the mixture and other parameters. The analysis is grouped over three different ranges of the reduced electric field: E/N ≤ 150 Td, E/N = 150–400 Td and E/N > 400 Td. Non-numerous experimental and theoretical studies of the fast gas heating in hydrogen- and hydrocarbon-containing mixtures are discussed and compared to the results in non-flammable mixtures. This article is to provide a comprehensive overview of the progress of kinetics of fast gas heating and to indicate the lack of experimental data and consequently, the gap in the knowledge of energy relaxation in discharges in combustible mixtures. (10.1016/j.pecs.2021.100928)
  DOI : 10.1016/j.pecs.2021.100928
• On the interplay between interchange turbulence and sheared flows
  
  • Peret M.
  • Fedorczak N.
  • Vermare L.
  Physics of Plasmas, American Institute of Physics, 2022, 29 (7), pp.072306. The presence and the position of an X-point, namely, if the ion diamagnetic drift points toward it or not, strongly impact the edge plasma rotation in tokamaks. In the absence of kinetic effects such as magnetic ripple or ion orbit loss, the shape of the velocity profile results from the balance between neoclassical predictions and turbulent flow generation. In this contribution, we derive a reduced model of turbulence plunged in a shear flow. This model is based on (1) a description of the impact of a sheared flow on the interchange turbulence and (2) a prediction of the poloidal momentum generated by the turbulence. It includes the effects of both the magnetic topology and the finite shear layer width. The model is verified against 2D non-linear flux-driven simulations. Finally, the model predictions of the edge rotation resulting from the equilibrium between the neoclassical prediction and the poloidal momentum generation by the turbulence are invoked to describe the observations from experiment managed in the WEST tokamak. It points out the important role of the magnetic shear in the turbulence tilting and in the flow generation. (10.1063/5.0086992)
  DOI : 10.1063/5.0086992
• Sun Sailing Polar Orbiting Telescope (SunSPOT): A solar polar imaging mission design
  
  • Probst A.
  • Anderson T.
  • Farrish A.O.
  • Kjellstrand C.B.
  • Newheart A.M.
  • Thaller S.A.
  • Young S.A.Q.
  • Rankin K.
  • Akhavan-Tafti M.
  • Chartier A.
  • Chintzoglou G.
  • Duncan J.
  • Fritz B.
  • Maruca B.A.
  • Mcgranaghan R.M.
  • Meng X.
  • Perea R.
  • Robertson E.
  • Lowes L.
  • Nash A.
  • Romero-Wolf A.
  Advances in Space Research, Elsevier, 2022, 70 (2), pp.510-522. (10.1016/j.asr.2022.04.060)
  DOI : 10.1016/j.asr.2022.04.060
• Unraveling the competition/synergy between turbulence and 3D magnetic perturbations
  
  • Varennes Robin
  • Garbet Xavier
  • Bourne Emilie
  • Vermare L.
  • Sarazin Yanick
  • Dif-Pradalier Guilhem
  • Grandgirard Virginie
  • Ghendrih Philippe
  • Donnel Peter Peter
  • Peret Mathieu
  • Obrejan Kevin
  , 2022.
• Synergy of Turbulent Momentum Drive and Magnetic Braking
  
  • Varennes R.
  • Garbet X.
  • Vermare L.
  • Sarazin Y.
  • Dif-Pradalier G.
  • Grandgirard V.
  • Ghendrih P.
  • Donnel P.
  • Peret M.
  • Obrejan K.
  • Bourne E.
  Physical Review Letters, American Physical Society, 2022, 128 (25), pp.255002. (10.1103/PhysRevLett.128.255002)
  DOI : 10.1103/PhysRevLett.128.255002
• Modeling solar flares and CMEs : Dynamics and link SEPs acceleration and injection
  
  • Masson Sophie
  , 2022.
• Initial results from boron powder injection experiments in WEST lower single null L-mode plasmas
  
  • Bodner G.
  • Gallo A.
  • Diallo A.
  • Lunsford R.
  • Moreau P.
  • Nagy A.
  • Pellissier F-P.
  • Guillemaut C.
  • Gunn J.P.
  • Bourdelle C.
  • Desgranges C.
  • Manas P.
  • Bortolon A.
  • Klepper C.C.
  • Tsitrone E.
  • Unterberg E.A.
  • Vermare L.
  Nuclear Fusion, IOP Publishing, 2022, 62, pp.086020. Using a recently installed impurity powder dropper (IPD), boron powder (<150 μm) was injected into lower single null (LSN) L-mode discharges in WEST. IPDs possibly enable real-time wall conditioning of the plasma-facing components and may help to facilitate H-mode access in the full-tungsten environment of WEST. The discharges in this experiment featured $I_p$ = 0.5 MA, $B_T$ = 3.7 T, $q_{95}$ = 4.3, t$_{pulse}$ = 12-30 s, n$_{e,0}$ ∼ 4 × 10$^{19}$ m$^{−2}$ , and $P_{LHCD}$ ∼ 4.5 MW. Estimates of the deuterium and impurity particle fluxes, derived from a combination of visible spectroscopy measurements and their corresponding S/XB coefficients, showed decreases of ∼50% in O$^+$ , N$^+$ , and C$^+$ populations during powder injection and a moderate reduction of these low-Z impurities (∼50%) and W (∼10%) in the discharges that followed powder injection. Along with the improved wall conditions, WEST discharges with B powder injection observed improved confinement, as the stored energy W MHD , neutron rate, and electron temperature $T_e$ increased significantly (10%-25% for W MHD and 60%-200% for the neutron rate) at constant input power. These increases in confinement scale up with the powder drop rate and are likely due to the suppression of ion temperature gradient (ITG) turbulence from changes in $Z_{eff}$ and/or modifications to the electron density profile. (10.1088/1741-4326/ac70ea)
  DOI : 10.1088/1741-4326/ac70ea
• Modeling the impact of a strong X-class solar flare on the planetary ion composition in Mercury's magnestosphere
  
  • Werner Elisabeth
  • Leblanc François
  • Chaufray Jean-Yves
  • Modolo Ronan
  • Aizawa Sae
  • Hadid L. Z.
  • Baskevitch Claire
  , 2022, pp.56. Solar flares could potentially give rise to sudden changes in the planetary ion composition in Mercury's magnetosphere. We model the time-dependent evolution of the Mg + , Na +, O + and He⁺ ion density distribution during the extreme X9.3-class solar flare event on 6 September 2017 with the Latmos Ionized Exosphere (LIZE) model. We find that the peak ion density in the nightside plasma sheet is delayed by ∼7−8 min compared to the dayside, and that the maximum Mg + density occurs ∼4 min before He + and O + in the whole magnetosphere. We also find that there exist two ion energy populations on the dayside which experience different dynamical evolution during the event.
• BepiColombo First Mercury Fly-by: first taste of the mission results on investigation of the environment around the planet
  
  • Milillo Anna
  • André Nicolas
  • Barabash S.
  • Delcourt Dominique
  • Heyner Daniel
  • Huovelin J.
  • Moissl R.
  • Moncuquet M.
  • Orsini S.
  • Saito Y.
  • Vainio R.
  • Varsani A.
  • Aizawa S.
  • Alberti T.
  • Baumjohann W.
  • Benkhoff J.
  • Hadid L. Z.
  • Grande M.
  • Griton L.
  • Gunter L.
  • Issautier K.
  • Jeszenszky H.
  • Kasaba Y.
  • Lichtenegger H.
  • Murakami G.
  • Nilsson H.
  • Raines J.
  • Sanchez-Cano B.
  • Slavin J.
  • Wurz P.
  • Zender J.
  • Aronica A.
  • Carr C.M.
  • Dandouras I.
  • de Angelis E.
  • Esko E.
  • Fedorov A.
  • Fiethe B.
  • Fischer H.
  • Fontaine D.
  • Fraenz M.
  • Glassmeier C-H.
  • Harada Y.
  • Jarvinen R.
  • Kallio E.
  • Karlsson T.
  • Katra B.
  • Kazakov A.
  • Kojima H.
  • Korpela S.
  • Krupp N.
  • Krueger H.
  • Leblanc François
  • Lehtolainen A.
  • Livi S.
  • Magnes W.
  • Mangano V.
  • Matsuoka A.
  • Miyake W.
  • Nakamura R.
  • Noschese R.
  • Oleynik P.
  • Olivieri A.
  • Persson M.
  • Phillips M.
  • Plainaki C.
  • Rispoli R.
  • Sauvaud J.-A.
  • Schmid D.
  • Sordini R.
  • Trantham B.
  • Verdeil C.
  • Vertolli N.
  • Yagitani S.
  • Yoshikawa I.
  • Yokota S.
  • Wahlund J.-E.
  • Wieser M.
  • Wallner R.
  , 2022, pp.38-39. The ESA-JAXA BepiColombo satellite suite has passed by its target planet Mercury for the first time on 1st October 2021. The trajectory was in the southern hemisphere from nightside dusk toward dayside dawn, thus crossing the magnetosheath, the magnetotail, nightside plasma sheet and exiting in dayside dawnward magnetopause and bow shock. It explored, for the first time, regions never observed by other spacecraft in the past. All the instruments able to perform science observations in cruise configurations have been operated providing the first observations of Mercury’s inner southern magnetosphere and surrounding regions. These observations include magnetic fields, solar wind and magnetospheric ions and electrons in different energy ranges, plasma waves, energetic particles and exosphere. During the pass, BepiColombo encountered a low interplanetary magnetic field and low energy solar wind. Unexpected interesting signals have been observed in the solar wind before the magnetospheric bow shock, at the magnetopause inbound as well as in the outbound solar wind. This paper will present a general overview of the observations, just as a first taste of the great results expected from this mission.
• Plasma assisted combustion of methane-air mixtures: Validation and reduction
  
  • Cheng L.
  • Barleon N.
  • Cuenot B.
  • Vermorel O.
  • Bourdon A.
  Combustion and Flame, Elsevier, 2022, 240, pp.111990. (10.1016/j.combustflame.2022.111990)
  DOI : 10.1016/j.combustflame.2022.111990
• The scenic tour of the Venusian magnetosheath by BepiColombo
  
  • Persson M.
  • Aizawa S.
  • André N.
  • Barabash S.
  • Saito Y.
  • Harada Y.
  • Heyner D.
  • Orsini S.
  • Fedorov A.
  • Mazelle C.
  • Futaana Y.
  • Hadid L.
  • Volwerk M.
  • Collinson G.
  • Sanchez-Cano B.
  • Barthe A.
  • Penou E.
  • Yokota S.
  • Génot V.
  • Sauvaud Jean-André
  • Delcourt D.
  • Fraenz M.
  • Modolo Ronan
  • Milillo A.
  • Auster Hans-Ulrich
  • Richter I.
  • Mieth J. Z. D.
  • Louarn P.
  • Owen C. J.
  • Horbury T. S.
  • Asamura K.
  • Matsuda S.
  • Nilsson H.
  • Wieser M.
  • Alberti T.
  • Varsani A.
  • Mangano V.
  • Mura A.
  • Lichtenegger H.
  • Laky G.
  • Jeszenszky H.
  • Masunaga K.
  • Signoles C.
  • Rojo M.
  • Murakami G.
  , 2022, pp.45. With the 2nd Venus flyby by BepiColombo on August 10th 2021, we had the rare opportunity to make a complete tour of the Venusian magnetosheath: one of the few gas-dynamic dominated solar wind-object interaction regions in the Solar System. The flyby passed through the full magnetosheath, from the nightside flank towards the stagnation region near the subsolar point and out through a quasi-perpendicular bow shock. The flyby was made during the extremely rare opportunity when Solar Orbiter was located upstream, close to Venus, due to its Venus flyby the day before. Solar Orbiter could therefore provide complementary solar wind measurements, which showed very stable conditions during the BepiColombo flyby. The rare spacecraft configuration and the stable conditions provided new intel on the stagnation point at near solar minimum conditions, as measured by seven plasma and magnetic field instruments on BepiColombo. The measurements show a stagnation region expanded to large distances from Venus, which confirms that Venus is fully capable of withstanding the solar wind even at near solar minimum conditions.
• Foundations of plasma catalysis for environmental applications
  
  • Bogaerts Annemie
  • Neyts Erik
  • Guaitella Olivier
  • Murphy Anthony
  Plasma Sources Science and Technology, IOP Publishing, 2022, 31 (5), pp.053002. Abstract Plasma catalysis is gaining increasing interest for various applications, but the underlying mechanisms are still far from understood. Hence, more fundamental research is needed to understand these mechanisms. This can be obtained by both modelling and experiments. This foundations paper describes the fundamental insights in plasma catalysis, as well as efforts to gain more insights by modelling and experiments. Furthermore, it discusses the state-of-the-art of the major plasma catalysis applications, as well as successes and challenges of technology transfer of these applications. (10.1088/1361-6595/ac5f8e)
  DOI : 10.1088/1361-6595/ac5f8e