Publications

2021

• Key impact of phase dynamics and diamagnetic drive on Reynolds stress in magnetic fusion plasmas
  
  • Sarazin Y
  • Dif-Pradalier Guilhem
  • Garbet X
  • Ghendrih P
  • Berger Anatole
  • Gillot C
  • Grandgirard V
  • Obrejan K
  • Varennes R
  • Vermare L
  • Cartier-Michaud T
  Plasma Physics and Controlled Fusion, IOP Publishing, 2021. Reynolds stress is a key facet of turbulence self-organization. In the magnetized plasmas of controlled fusion devices, the zonal flows that are driven by the averaged Reynolds stress modify the confinement performance. We address this problem with full-f gyrokinetic simulations of ion temperature gradient driven turbulence. From the detailed analysis of the 3-dimensional electric potential and transverse pressure fields, we show that the diamagnetic contribution to the Reynolds stress-stemming from finite Larmor radius effects-exceeds the electrostatic contribution by a factor of about two. Besides, both contributions are in phase, indicating that pressure does not behave as a passive scalar. In addition, the Reynolds stress induced by the electric drift velocity is found to be mainly governed by the gradient of the phase of the electric potential modes rather than by their magnitude. By decoupling Reynolds stress drive and turbulence intensity, this property indicates a careful analysis of phase dynamics is crucial in the interpretation of experiments and simulations. (10.1088/1361-6587/abf673)
  DOI : 10.1088/1361-6587/abf673
• Kinetic Interaction of Cold and Hot Protons With an Oblique EMIC Wave Near the Dayside Reconnecting Magnetopause
  
  • Toledo‐redondo S.
  • Lee J.
  • Vines S.
  • Turner D.
  • Allen R.
  • André M.
  • Boardsen S.
  • Burch J.
  • Denton R.
  • Fu H.
  • Fuselier S.
  • Gershman D.
  • Giles B.
  • Graham D.
  • Kitamura N.
  • Khotyaintsev Yu.
  • Lavraud B.
  • Le Contel O.
  • Li W.
  • Moore T.
  • Navarro E.
  • Portí J.
  • Salinas A.
  • Vinas A.
  Geophysical Research Letters, American Geophysical Union, 2021, 48 (8). (10.1029/2021GL092376)
  DOI : 10.1029/2021GL092376
• Plasma plume expansion with pulsed electron neutralization
  
  • Habl L
  • Lafleur T
  • Rafalskyi D
  • Chabert Pascal
  Plasma Sources Science and Technology, IOP Publishing, 2021, 30 (4), pp.045014. (10.1088/1361-6595/abf1d5)
  DOI : 10.1088/1361-6595/abf1d5
• Gyrokinetic investigation of Alfvén instabilities in the presence of turbulence
  
  • Biancalani A
  • Bottino A
  • Di Siena A
  • Gürcan Ö
  • Hayward-Schneider T
  • Jenko F
  • Lauber P
  • Mishchenko A
  • Morel P
  • Novikau I
  • Vannini F
  • Villard L
  • Zocco A
  Plasma Physics and Controlled Fusion, IOP Publishing, 2021, 63 (6), pp.065009. The nonlinear dynamics of beta-induced Alfvén eigenmodes (BAEs) driven by energetic particles (EPs) in the presence of ion-temperature-gradient turbulence is investigated, by means of selfconsistent global gyrokinetic simulations and analytical theory. A tokamak magnetic equilibrium with large aspect ratio and reversed shear is considered. A previous study of this configuration has shown that the electron species plays an important role in determining the nonlinear saturation level of a BAE in the absence of turbulence (Biancalani et al 2020 J. Plasma Phys.). Here, we extend the study to a turbulent plasma. The EPs are found modify the heat fluxes by introducing energy at the large spatial scales, mainly at the toroidal mode number of the dominant BAE and its harmonics. In this regime, BAEs are found to carry a strong electron heat flux. The feed-back of the global relaxation of the temperature profiles induced by the BAE, and on the turbulence dynamics, is also discussed. (10.1088/1361-6587/abf256)
  DOI : 10.1088/1361-6587/abf256
• A new method to dispatch split particles in Particle-In-Cell codes
  
  • Smets Roch
  • Aunai Nicolas
  • Ciardi Andrea
  • Drouin Matthieu
  • Campos-Pinto Martin
  • Deegan Philip
  Computer Physics Communications, Elsevier, 2021, 261, pp.107666. Particle-In-Cell codes are widely used for plasma physics simulations. It is often the case that particles within a computational cell need to be split to improve the statistics or, in the case of non-uniform meshes, to avoid the development of fictitious self-forces. Existing particle splitting methods are largely empirical and their accuracy in preserving the distribution function has not been evaluated in a quantitative way. Here we present a new method specifically designed for codes using adaptive mesh refinement. Although we point out that an exact, distribution function preserving method does exist, it requires a large number of split particles and its practical use is limited. We derive instead a method that minimizes the cost function representing the distance between the assignment function of the original particle and that of the sum of split particles. Depending on the interpolation degree and on the dimension of the problem, we provide tabulated results for the weight and position of the split particles. This strategy represents no overhead in computing time and for a large enough number of split-particles it asymptotically tends to the exact solution. (10.1016/j.cpc.2020.107666)
  DOI : 10.1016/j.cpc.2020.107666
• Multiscale analysis of a current sheet embedded in a fast earthward flow during a substorm event detected by MMS
  
  • Le Contel Olivier
  • Retino Alessandro
  • Alexandrova Alexandra
  • Nakamura Rumi
  • Alqeeq Soboh
  • Chust Thomas
  • Mirioni Laurent
  • Catapano Filomena
  • Jacquey Christian
  • Toledo Sergio
  • Stawarz Julia
  • Goodrich Katherine
  • Gershman Daniel
  • Fuselier Stephen
  • Mukherjee Joey
  • Ahmadi Narges
  • Graham Daniel
  • Argall Matthew
  • Fischer David
  • Huang Shiyong
  , 2021. <p>In July 2017, the MMS constellation was evolving in the magnetotail with an apogee of 25 Earth radii and an average inter-satellite distance of 10 km (i.e. at electron scales). On 23 rd of July around 16:19 UT, MMS was located at the edge of the current sheet which was in a quasi-static state. Then, MMS<br>suddenly entered in the central plasma sheet and detected the local onset of a small substorm as indicated by the AE index (~400 nT). Fast earthward plasma flows were measured for about 1 hour starting with a period of quasi-steady flow and followed by a saw-tooth like series of plasma jets (“bursty bulk flows”). In the present study, we focus on a short sequence related to an ion scale current sheet crossing embedded in a fast earthward flow. We analyse in detail two other kinetic structures in the vicinity of this current sheet: an ion-scale flux rope and an electron vortex magnetic hole and discuss the Ohm’s law and conversion energy processes.</p> (10.5194/egusphere-egu21-14350)
  DOI : 10.5194/egusphere-egu21-14350
• Impact induced electric field signals observed by the Solar Orbiter/RPW
  
  • Morooka Michiko
  • Khotyaintsev Yuri
  • Eriksson Anders
  • Edberg Niklas
  • Johansson Erik
  • Maksimovic Milan
  • Bale Stuart
  • Chust Thomas
  • Krasnoselskikh Volodya
  • Kretzschmar Matthieu
  • Lorfèvre Eric
  • Plettemeier Dirk
  • Souček Jan
  • Steller Manfred
  • Štverák Štěpán
  • Trávníček Pavel
  • Vaivads Andris
  • Vecchio Antonio
  , 2021. A large-amplitude impact-induced like electric field signal is often observed by the Radio and Plasma Wave (RPW) Instrument onboard Solar Orbiter. The signal has a sharp increase followed by an exponential decay, typically observed when spacecraft experiences a dust impact. The amplitude can reach several V/m. The impact dust size can be estimated from the electric field amplitude and is similar to the characteristic dust size near the sun expected from the zodiacal-light observations. On the other hand, the signal's decay time is the order of second, unusually long compared to the dust impact signals previously reported by the other spacecraft. We will show the characteristics of these signals and discuss the origin. (10.5194/egusphere-egu21-13801)
  DOI : 10.5194/egusphere-egu21-13801
• Electromagnetic electron hole generation: theory and PIC simulations
  
  • Gauthier Gaetan
  • Chust Thomas
  • Le Contel Olivier
  • Savoini Philippe
  , 2021. <div> <div> <div> <p>Recent MMS observations (<em>e.g.</em> [Holmes et al, 2018, Steinvall et al., 2019]) exploring various regions of the magnetosphere have found solitary potential structures call Electron phase-space Hole (EH). These structures have kinetic scale (dozens of Debye lengths) and persist during long time (dozens of plasma frequency periods). EH are characterized by a bipolar electric field parallel to ambient magnetic field and fastly propagate along this latter (a few tenths of speed light). We have created a 3D Bernstein-Greene-Kruskal (BGK) model (as [Chen et al, 2004]) adapted to various magnetospheric ambient magnetic fields. BGK model results depend on choice of potential shape and passing distribution function at infinity (before EH potential interaction).</p> <p>2D-3V Particle-In-Cell simulations have been developed with the fully kinetic code Smilei [Derouillat et al, 2017], using real magnetosphere plasma parameters. Solitary waves in the magnetotail are three-dimensional potentials which can be generated through nonlinear evolution of an electron beam instability (or bump on tail). The simulated EH are comparable to the EH observed in the magnetosphere with the same parameters.</p> <p>We have also investigated the EH formation with density inhomogeneities using a BGK stability model we have developed. Indeed, density inhomogeneities exist notably in interplanetary plasmas. As a result taking into account the background density inhomogeneities, significantly alters the stability criteria. We have performed 2D-3V PIC simulations with realistic inhomogeneous density background (smaller than 10% of mean density) to understand such a type of EH formation.</p> <p><strong>References:</strong></p> <ul><li>Holmes et al., J. Geophys. Res. Space Phys. 123, 9963, 2018</li> <li>Steinvall et al., Phys. Rev. Lett. 123, 255101, 2019</li> <li>Chen et al., Phys. Rev. E 69, 055401, 2004</li> <li>Derouillat et al., Comput. Phys. Commun. 222, 351, 2017</li> </ul><div> <div> <div> <div> <div> <div> <div> <div> <div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> (10.5194/egusphere-egu21-11078)
  DOI : 10.5194/egusphere-egu21-11078
• Turbulent Plasma Jet Fronts and Related Ion Acceleration
  
  • Richard Louis
  • Khotyaintsev Yuri
  • Graham Daniel
  • Le Contel Olivier
  • Cohen Ian
  • Turner Drew
  • Giles Barbara
  • Lindqvist Per-Arne
  • Russell Christopher
  , 2021. <p>We investigate an earthward bursty bulk flow (BBF) observed by the Magnetospheric Multiscale (MMS) spacecraft in the Earth’s magnetotail (X<sub>GSM</sub> ~ -23.88 R<sub>E</sub>, Y<sub>GSM</sub> ~ 6.72 R<sub>E</sub>, Z<sub>GSM </sub>~ 4.06 R<sub>E)</sub>. At  the leading edge of the BBF we observe a complex magnetic field structure. In particular, within this region we identify multiple dipolarization fronts (DFs) and large amplitude oscillations of the magnetic field <em>B<sub>X</sub></em>, which correspond to a long wavelength current sheet flapping motion. Within the DFs, we observe increased fluxes of energetic ions and electrons. We investigate the trapping of the ions between two consecutive DFs. We discuss the ion acceleration mechanism and the adiabaticity of the ion energisation process.</p> (10.5194/egusphere-egu21-14489)
  DOI : 10.5194/egusphere-egu21-14489
• On the Bow-Shock dynamics in response to a Quasi-Perpendicular interaction with different Solar Wind conditions
  
  • Cazzola Emanuele
  • Fontaine Dominique
  • Savoini Philippe
  , 2021. This work will be giving new insights into the global Quasi-Perpendicular interaction effects of the Solar Wind with a realistic three-dimensional terrestrial-like curved Bow Shock (BS) by means of hybrid computer simulations. The Bow-Shock profoundly changes its behavior for different incoming Solar Wind conditions. For Alfvenic Mach numbers greater than a specific threshold, the Bow-Shock shows an intense rippling phenomenon propagating along its surface, as well as the formation of a set of waves in the near-Earth flanks. A similar rippling has been observed from different independent in-situ satellite crossings, as well as studied with ad-hoc computer simulations configured with 2D-planar shocks, conclusively confirming the highly kinetic nature of this phenomenon. Yet, the possible effects of a global three-dimensional curved interaction are still poorly described. As such, we have performed a series of 3D simulations at different Alfvenic Mach numbers, different plasma beta - ratio between the thermal to the magnetic pressures - and different incoming Interplanetary Magnetic Field (IMF) configurations with the hybrid code LatHyS, which was already successfully used for similar past analyses. Particularly, we have found that the ripples follow a pattern not directly driven by the IMF direction as initially expected, but rather a Nose-to-Flanks propagation with the rippling onset region being significantly displaced from the nose position. Additionally, this phenomenon seems to be mainly confined to the plane on where the IMF direction lies, with the perpendicular cross-sections showing only a slight oscillation. Finally, we have observes a significant ions acceleration in the local perpendicular directions along the flanks modulations, which is most likely related to the local IMF-BS normal fluctuations occurring in the ripples boundary. (10.5194/egusphere-egu21-10648)
  DOI : 10.5194/egusphere-egu21-10648
• Solar Orbiter/Radio and Plasma Wave observations during the first Venus flyby
  
  • Edberg Niklas J T
  • Hadid Lina
  • Maksimovic Milan
  • Bale Stuart D
  • Chust Thomas
  • Khotyaintsev Yuri
  • Krasnoselskikh Volodya
  • Kretzschmar Matthieu
  • Lorfèvre Eric
  • Plettemeier Dirk
  • Souček Jan
  • Steller Manfred
  • Štverák Štěpán
  • Trávníček Pavel
  • Vaivads Andris
  • Vecchio Antonio
  • Horbury Tim
  , 2021. We present measurements from the Radio and Plasma Wave (RPW) instrument suite onboard the Solar Orbiter mission during the first Venus encounter. RPW consists of several units and is capable of measuring both the electric and magnetic field fluctuations with three electric antennas and a search-coil magnetometer: The Low Frequency Receiver (LFR) cover the range from DC up to 10kHz when measuring the electric and magnetic waveform and spectra; the Thermal Noise and High Frequency Receiver (TNR-HFR) determines the electric power spectra and magnetic power spectra from 4kHz-20MHz, and 4kHz to 500kHz, respectively, to determine properties of the electron population; the Time Domain Sampler (TDS) measures and digitizes onboard the electric and magnetic field waveforms from 100 Hz to 250 kHz. The BIAS subunit measures DC and LF electric fields as well as the spacecraft potential, which gives a high cadence measure of the local plasma density when calibrated to the low-cadence tracking of the plasma peak from the TNR. Solar Orbiter approached Venus from the induced magnetotail and had its closest approach at an altitude of 7500 km over the north pole of Venus on 27 Dec 2020. The RPW instruments observed a tail region that extended several 10’s of Venus radii downstream of the planet. The induced magnetosphere was characterized to be a highly dynamic environment as Solar Orbiter traversed the downstream tail and magnetosheath before it crossed the Bow Shock outbound at ~12:40 UT. Polarized whistler waves, high frequency electrostatic waves, narrow-banded emissions, possible electron double layers were observed. The fine structure of the bow shock could also be investigated in detail. Solar Orbiter could hence enhance the knowledge of the structure of the solar wind-Venus interaction. (10.5194/egusphere-egu21-12198)
  DOI : 10.5194/egusphere-egu21-12198
• Thin current sheets and the associated wave activity observed by Solar Orbiter
  
  • Graham Daniel
  • Khotyaintsev Yuri
  • Steinvall Konrad
  • Vaivads Andris
  • Maksimovic Milan
  • Edberg Niklas
  • Johansson Erik
  • Eriksson Anders
  • Kretzschmar Matthieu
  • Chust Thomas
  , 2021. Thin current sheets are routinely observed in the solar wind. Here we report observations of thin current sheets and the associated plasma waves using the Solar Orbiter spacecraft. The Radio and Plasma Waves (RPW) instrument provides high-resolution measurements of the electric field, number density perturbations, and magnetic field fluctuations, which we use to identify and characterise the observed waves, while the magnetic field provided by the MAG instrument is used to characterise the current sheets. We discuss the role of current sheets in the generation of the observed waves and the effects of the waves on the current sheets. (10.5194/egusphere-egu21-15860)
  DOI : 10.5194/egusphere-egu21-15860
• Whistler waves observed by Solar Orbiter during its first orbit
  
  • Kretzschmar Matthieu
  • Chust Thomas
  • Graham Daniel
  • Krasnosekskikh Volodya
  • Colomban Lucas
  • Maksimovic Milan
  • Horbury Timothy
  • Owen Christofer
  • Louarn Philippe
  , 2021. Plasma waves can play an important role in the evolution of the solar wind and the particle velocity distribution functions in particular. We analyzed the electromagnetic waves observed above a few Hz by the Radio Plasma Waves (RPW) instrument suite onboard Solar Orbiter, during its first orbit, which covered a distance from the Sun between 1 AU and 0.5 AU. We identified the majority of the detected waves as whistler waves with frequency around 0.1 f_ce and right handed circular polarisation. We found these waves to be mostly aligned or anti aligned with the ambient magnetic field, and rarely oblique. We also present and discuss their direction of propagation and the variation of the waves' properties with heliocentric distance. (10.5194/egusphere-egu21-15195)
  DOI : 10.5194/egusphere-egu21-15195
• How radial and quasi radial IMF impact the Earth's magnetopause's size, location, and shape. Does this impact generate Dawn-Dusk asymmetry in the magnetosheath?: Global 3D Kinetic Simulations. 
  
  • Baraka Suleiman
  • Le Contel Olivier
  • Ben-Jaffel Lotfi
  • Moore Bill
  , 2021. <p>The boundary between the solar wind (SW) and the Earth’s magnetosphere, named the magnetopause (MP), is highly dynamic. Its location and shape can vary as a function of different SW parameters such as density, velocity, and interplanetary magnetic field (IMF) orientations. We employ a 3D kinetic Particle-In-Cell (IAPIC) code to simulate these effects.  We investigate the impact of radial (B = Bx) and quasi-radial (Bz < Bx, By) IMF on the shape and size of Earth’s MP for a dipole tilt of 31<sup>o</sup> using both maximum density steepening and pressure system balance methods for identifying the boundary. We find that, compared with northward or southward-dominant IMF conditions, the MP position expands asymmetrically by 8 to 22% under radial IMF. In addition, we construct the MP shape along the tilted magnetic equator and the OX axes showing that the expansion is asymmetric, not global, stronger on the MP flanks, and is sensitive to the ambient IMF. Finally, we investigate the contribution of SW backstreaming ions by the bow shock to the MP expansion, the temperature anisotropy in the magnetosheath, and a strong dawn-dusk asymmetry in MP location.</p> (10.5194/egusphere-egu21-9675)
  DOI : 10.5194/egusphere-egu21-9675
• Steady-state flows in a visco-resistive magnetohydrodynamic model of tokamak plasmas with inhomogeneous heating
  
  • Roverc'H E
  • Oueslati H
  • Firpo M.-C
  Journal of Plasma Physics, Cambridge University Press (CUP), 2021. The axisymmetric visco-resistive magnetohydrodynamic steady states allowing flows (i.e. non-vanishing velocity fields) are computed for a toroidal JET-like geometry. It is shown that a spatially inhomogeneous heating of moderate magnitude leads to an increase of typical toroidal speeds with respect to the situation with uniform temperature with identical mean Hartmann numbers. A symmetry argument is introduced to capture the symmetry breaking, induced by the temperature gradient, that produces a net toroidal plasma flow.
• Wave trapping and E × B staircases
  
  • Garbet Xavier
  • Panico O
  • Varennes R
  • Gillot C
  • Dif-Pradalier Guilhem
  • Sarazin Y
  • Grandgirard V
  • Ghendrih P
  • Vermare L
  Physics of Plasmas, American Institute of Physics, 2021. A model of E×B staircases is proposed, based on a wave kinetic equation coupled to a poloidal momentum equation. A staircase pattern is idealised as a periodic radial structure of zonal shear layers that bound regions of propagating wave packets, viewed as avalanches. Wave packets are trapped in shear flow layers due to refraction. In this model an E × B staircase motif emerges due to the interaction between propagating wave packets (avalanches) and trapped waves in presence of an instability drive. Amplitude, shape, and spatial period of the staircase E × B flow are predicted as functions of the background fluctuation spectrum and the growth rate of drift waves. The zonal flow velocity radial profile is found to peak near its maxima and to flatten near its minima. The optimum configuration for staircase formation is a growth rate that is maximum at zero radial wave number. A mean shear flow is responsible for a preferential propagation speed of avalanches. It is not a mandatory condition for the existence of staircase solutions, but has an impact on their spatial period. (10.1063/5.0042930)
  DOI : 10.1063/5.0042930
• Ice Giants — The Return of the Rings
  
  • Hsu Hsiang-Wen
  • Sulaiman Ali
  • Cao Hao
  • Hedman Matthew
  • Agiwal Omakshi
  • Altobelli Nicolas
  • Baillie Kevin
  • Becker Tracy
  • Blanc Michel
  • Brooks Shawn
  • Crida Aurélien
  • Cuzzi Jeffrey
  • Pater Imke De
  • Estrada Paul
  • Hadid L. Z. L. Z. Hadid
  • Horányi Mihály
  • Hunt Gregory
  • Ip Wing-Huen
  • Khawaja Nozair
  • Kempf Sascha
  • Kollmann Peter
  • Kurth William
  • Leonard Erin
  • Linti Simon
  • Mankovich Christopher
  • Miller Kelly
  • Moore Luke
  • Morooka Michiko
  • O'Donoghue James
  • Perry Mark
  • Postberg Frank
  • Roussos Elias
  • Schirdewahn Daniel
  • Schmidt Jürgen
  • Shebanits Oleg
  • Showalter Mark
  • Spahn Frank
  • Spilker Linda
  • Spilker Tom
  • Srama Ralf
  • Szalay Jamey
  • Tseng Wei-Ling
  • Jr. J. Hunter Waite
  Bulletin of the American Astronomical Society, American Astronomical Society, 2021, 53 (4). Planetary rings are a multifaceted player in the system. Recent advances about Saturn’s rings argue that ring science at the ice giants, with magnetospheric and atmospheric sciences, are essential in advancing our knowledge about solar system evolution, the evolution of the moons and Ocean Worlds, and phenomena observed in the ice giant systems. (10.3847/25c2cfeb.b28bf609)
  DOI : 10.3847/25c2cfeb.b28bf609
• Cholangiopathy aggravation is caused by VDR ablation and alleviated by VDR-independent vitamin D signaling in ABCB4 knockout mice
  
  • Gonzalez-Sanchez Ester
  • El Mourabit Haquima
  • Jager Marion
  • Clavel Marie
  • Moog Sophie
  • Vaquero Javier
  • Ledent Tatiana
  • Cadoret Axelle
  • Gautheron Jérémie
  • Fouassier Laura
  • Wendum Dominique
  • Chignard Nicolas
  • Housset Chantal
  Biochimica et Biophysica Acta - Molecular Basis of Disease, Elsevier, 2021, 1867 (4), pp.166067. (10.1016/j.bbadis.2020.166067)
  DOI : 10.1016/j.bbadis.2020.166067
• A compact exact law for compressible isothermal Hall magnetohydrodynamic turbulence
  
  • Ferrand Renaud
  • Galtier Sébastien
  • Sahraoui Fouad
  Journal of Plasma Physics, Cambridge University Press (CUP), 2021, 87 (2), pp.905870220. Using mixed second-order structure functions, a compact exact law is derived for isothermal compressible Hall magnetohydrodynamic turbulence with the assumptions of statistical homogeneity, time stationarity and infinite kinetic/magnetic Reynolds numbers. The resulting law is written as the sum of a Yaglom-like flux term, with an overall expression strongly reminiscent of the incompressible law, and a pure compressible source. Being mainly a function of the increments, the compact law is Galilean invariant but is dependent on the background magnetic field if one is present. Only the magnetohydrodynamic source term requires multi-spacecraft data to be estimated whereas the other components, which include those introduced by the Hall term, can be fully computed with single-spacecraft data using the Taylor hypothesis. These properties make this compact law more appropriate for analysing both numerical simulations and in situ data gathered in space plasmas, in particular when only single-spacecraft data are available. (10.1017/S0022377821000374)
  DOI : 10.1017/S0022377821000374
• Conditions of appearance and dynamics of the modified two-stream instability in E × B discharges
  
  • Petronio Federico
  • Tavant Antoine
  • Charoy Thomas
  • Alvarez-Laguna Alejandro
  • Bourdon Anne
  • Chabert Pascal
  Physics of Plasmas, American Institute of Physics, 2021, 28 (4), pp.043504. (10.1063/5.0046843)
  DOI : 10.1063/5.0046843
• A spectral model for interchange transport in tokamak scrape-off layers
  
  • Peret M.
  • Fedorczak N.
  • Tamain P.
  • Ghendrih Ph
  • Ghendrih Ph.
  • Vermare L.
  Nuclear Fusion, IOP Publishing, 2021, 61 (4), pp.046045. Transport across flux surfaces in tokamak scrape-off layers is assumed to be carried by the convection of intermittent filaments (blobs) drifting outward due to interchange mechanisms. This intermittency keeps one away from analytically draw a transport model. A balance between parallel transport to the sheath and transverse transport approached here in a spectral point of view. This Spectral Filament model decomposes the transport in a sum of contributions from poloidal waves described by the 2D isothermal Braginskii's equations. Turbulent behavior predictions from the model founds a very good agreement against 2D simulations and a comparison with (1) parametric dependencies from experimental scaling laws and (2) an experimental dataset from Tore Supra for SOL parameters are also well recovered. A scaling of energy confinement time is finally drawn from this flux model. (10.1088/1741-4326/abe6b3)
  DOI : 10.1088/1741-4326/abe6b3
• Particle-in-cell simulations of the alpha and gamma modes in collisional nitrogen capacitive discharges
  
  • Kawamura E
  • Lieberman M
  • Lichtenberg A
  • Chabert P
  Plasma Sources Science and Technology, IOP Publishing, 2021, 30 (3), pp.035001. (10.1088/1361-6595/abde22)
  DOI : 10.1088/1361-6595/abde22
• Filling the Gaps in Our Understanding of Plasmas in Simple Diatomic Gases- Combining a DC Plasma in Pure O2 with Multiple Advanced Diagnostics for Experimental Validation of Simulations
  
  • Booth Jean-Paul
  , 2021.
• Filling the Gaps in Our Understanding of Plasmas in Simple Diatomic Gases-Combining a DC Plasma in Pure O2 with Multiple Advanced Diagnostics for Experimental Validation of Simulations
  
  • Booth Jean-Paul
  • Chatterjee A
  • Guaitella O
  • Lopaev D
  • Zyryanov S
  • Rakhimova T
  • Voloshin D
  • Oliveira N De
  • Nahon L
  , 2021.
• Effect of oxygen atoms on the vibrational kinetics of CO 2 and CO revealed by the use of a large surface area material
  
  • Morillo-Candas A
  • Klarenaar B
  • Amoedo C
  • Guerra V
  • Guaitella O
  Journal of Physics D: Applied Physics, IOP Publishing, 2021, 54 (9), pp.095208. (10.1088/1361-6463/abc992)
  DOI : 10.1088/1361-6463/abc992