Publications

2022 | 2021 | 2020 | 2019

Below, by year, are the publications listed in the HAL open archive.

2010

Shell Models and the possibility of application to fusion plasmas
- Gürcan Özgür D.
- Hennequin Pascale
- Garbet X.
- Diamond P.H.
- Vermare Laure
- Casati A.
- Falchetto G.
, 2010 (oral).
Météorologie de l'Espace en Afrique : les programmes Année 2010 Egypte France et ISWI
- Damé Luc
- Marhous Ayman
- Amory-Mazaudier Christine
- Petitdidier Monique
- Hady Ahmed
, 2010, pp.8 p..
Modelling of chlorine inductive discharges
- Chabert Pascal
- Despiau-Pujo Emilie
, 2010.
Effect of low-frequency power on electron density and ion flux in dual-frequency capacitive radiofrequency discharges
- Booth Jean-Paul
- Curley G.
- Chabert Pascal
, 2010.
Nonstationarity of two / three - dimensional supercritical perpendicular shocks: nonlinear whistler emission versus shock front self-reformation
- Lembège Bertrand
- Savoini Philippe
- Hellinger P.
- Travnicek P. M.
, 2010.
Measurements and Modeling of Turbulent Transport in the Tore Supra Tokamak
- Garbet X.
- Abiteboul J.
- Benkadda S.
- Bourdelle C.
- Casati A.
- Clairet F.
- Dubuit N.
- Falchetto G.
- Fenzi C.
- Futatani S.
- Grandgirard V.
- Guirlet R.
- Gürcan Özgür D.
- Hennequin Pascale
- Heuraux S.
- Hoang G.T.
- Honoré Cyrille
- Sabot R.
- Sarazin Y.
- Ségui J.-L.
- Smolyakov A.
- Trier Elisée
- Vermare Laure
- Villegas D.
, 2010, 1308, pp.75-84. This paper presents an overview of recent advances in modeling and measurements of turbulence in Tore Supra plasmas. Spatio‐temporal properties of turbulence are discussed in relation with transport models. An explanation is proposed for the k−3 decay of wave number spectra, which are observed by using both coherent laser scattering and Doppler reflectometry. Also the interplay between turbulence and flows has been investigated. It is shown that toroidal rotation results from a competition between neoclassical and turbulence flow generation. Finally a new method has been proposed to determine the transport coefficients of impurities. These coefficients are usually well above the neoclassical prediction. (10.1063/1.3526165)
DOI : 10.1063/1.3526165
Surface discharges: possible applications for plasma-assisted ignition and electric field measurements (AIAA 2010-1587)
- Starikovskaia Svetlana
- Allegraud Katia
- Guaitella Olivier
- Kosarev I.N.
- Mintoussov E.I.
- Pendleton S.J.
- Popov N.A.
- Sagulenko P.N.
- Rousseau Antoine
, 2010.
Observation and theoretical modeling of electron scale solar wind turbulence
- Sahraoui Fouad
- Belmont Gérard
- Goldstein M. L.
- Kiyani K. H.
- Robert Patrick
- Canu Patrick
, 2010.
Plasmas de Fusion Magnétique
- Hennequin Pascale
Flash X - La revue scientifique de l'Ecole polytechnique, Ecole polytechnique, 2010, 12, pp.25-26. ISSN : 1775-0385
Observations multi-satellitaires de l'interaction Vent Solaire - Magnétosphère
- Sahraoui Fouad
- Cornilleau-Wehrlin Nicole
Flash X - La revue scientifique de l'Ecole polytechnique, Ecole polytechnique, 2010, 12, pp.33-34. ISSN : 1775-0385
Scientific objectives and instrumentation of Mercury Plasma Particle Experiment (MPPE) onboard MMO
- Saito Y.
- Sauvaud J.-A.
- Hirahara M.
- Barabash S.
- Delcourt Dominique C.
- Takashima T.
- Asamura K.
Planetary and Space Science, Elsevier, 2010, 58 (1-2), pp.182-200. Mercury is one of the least explored planets in our solar system. Until the recent flyby of Mercury by MESSENGER, no spacecraft had visited Mercury since Mariner 10 made three flybys: two in 1974 and one in 1975. In order to elucidate the detailed plasma structure and dynamics around Mercury, an orbiter BepiColombo MMO (Mercury Magnetospheric Orbiter) is planned to be launched in 2013 as a joint mission between ESA and ISAS/JAXA. Mercury Plasma Particle Experiment (MPPE) was proposed in order to investigate the plasma/particle environment around Mercury. MPPE is a comprehensive instrument package for plasma, high-energy particle and energetic neutral atom measurements. It consists of seven sensors: two Mercury electron analyzers (MEA1 and MEA2), Mercury ion analyzer (MIA), Mercury mass spectrum analyzer (MSA), high-energy particle instrument for electron (HEP-ele), high-energy particle instrument for ion (HEP-ion), and energetic neutrals analyzer (ENA). Since comprehensive full three-dimensional simultaneous measurements of low to high-energy ions and electrons around Mercury as well as measurements of energetic neutral atoms will not be realized before BepiColombo/MMO's arrival at Mercury, it is expected that many unresolved problems concerning the Mercury magnetosphere will be elucidated by the MPPE observation. (10.1016/j.pss.2008.06.003)
DOI : 10.1016/j.pss.2008.06.003
Chorus source region localization in the Earth's outer magnetosphere using THEMIS measurements
- Agapitov O
- Krasnoselskikh V
- Zaliznyak Yu
- Angelopoulos V
- Le Contel Olivier
- Rolland G
Annales Geophysicae, European Geosciences Union, 2010, 28, pp.1377–1386. Discrete ELF/VLF chorus emissions, the most intense electromagnetic plasma waves observed in the Earth's radiation belts and outer magnetosphere, are thought to propagate roughly along magnetic field lines from a localized source region near the magnetic equator towards the magnetic poles. THEMIS project Electric Field Instrument (EFI) and Search Coil Magnetometer (SCM) measurements were used to determine the spatial scale of the chorus source lo-calization region on the day side of the Earth's outer magne-tosphere. We present simultaneous observations of the same chorus elements registered onboard several THEMIS spacecraft in 2007 when all the spacecraft were in the same orbit. Discrete chorus elements were observed at 0.15–0.25 of the local electron gyrofrequency, which is typical for the outer magnetosphere. We evaluated the Poynting flux and wave vector distribution and obtained chorus wave packet quasi-parallel propagation to the local magnetic field. Amplitude and phase correlation data analysis allowed us to estimate the characteristic spatial correlation scale transverse to the local magnetic field to be in the 2800–3200 km range. Keywords. Electromagnetics (Random media and rough surfaces) – Magnetospheric physics (Plasma waves and in-stabilities) – Radio science (Remote sensing) (10.5194/angeo-28-1377-2010)
DOI : 10.5194/angeo-28-1377-2010
RPWS_ViToS
- Piberne Rodrigue
- Canu Patrick
, 2010. RPWS_ViToS is an IDL software for data processing and visualization of the RPW instrument of the Cassini mission.
Wave-particle interactions in the equatorial source region of whistler-mode emissions
- Santolík Ondrej
- Gurnett D. A.
- Pickett J. S.
- Grimald S.
- Décréau Pierrette
- Parrot Michel
- Cornilleau-Wehrlin Nicole
- El-Lemdani Mazouz Farida
- Schriver D.
- Meredith N. P.
- Fazakerley A.
Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2010, 115 (A8). Wave-particle interactions can play a key role in the process of transfer of energy between different electron populations in the outer Van Allen radiation belt. We present a case study of wave-particle interactions in the equatorial source region of whistler-mode emissions. We select measurements of the Cluster spacecraft when these emissions are observed in the form of random hiss with only occasional discrete chorus wave packets, and where the wave propagation properties are very similar to previously analyzed cases of whistler-mode chorus. We observe a positive divergence of the Poynting flux at minima of the magnetic field modulus along the magnetic field lines, indicating the central position of the source. In this region we perform a linear stability analysis based on the locally measured electron phase space densities. We find two unstable electron populations. The first of them consists of energy-dispersed and highly anisotropic injected electrons at energies of a few hundreds eV to a few keV, with the perpendicular temperature more than 10 times higher than the parallel temperature with respect to the magnetic field line. Another unstable population is formed by trapped electrons at energies above 10 keV. We show that the injected electrons at lower energies can be responsible for a part of the waves that propagate obliquely at frequencies above one half of the electron cyclotron frequency. Our model of the trapped electrons at higher energies gives insufficient growth of the waves below one half of the electron cyclotron frequency and a nonlinear generation mechanism might be necessary to explain their presence even in this simple case. (10.1029/2009JA015218)
DOI : 10.1029/2009JA015218
Operation of a load current multiplier on a nanosecond mega-ampere pulse forming line generator
- Chuvatin Alexandre S.
- Kantsyrev Viktor L.
- Rudakov Leonid I.
- Cuneo Michael E.
- Astanovitskiy A. L.
- Presura Radu
- Safronova Alla S.
- Cline W.
- Williamson Kenneth M.
- Shrestha Ishor
- Osborne Glenn C.
- Le Galloudec B.
- Nalajala Vidya
- Pointon T. D.
- Mikkelson K. A.
Physical Review Special Topics: Accelerators and Beams, American Physical Society, 2010, 13 (1), pp.010401. We investigate the operation of a load current multiplier (LCM) on a pulse-forming-line nanosecond pulse-power generator. Potential benefits of using the LCM technique on such generators are studied analytically for a simplified case. A concrete LCM design on the Zebra accelerator (1.9 Ohm, ∼1  MA, 100 ns) is described. This design is demonstrated experimentally with high-voltage power pulses having a rise time of dozens of nanoseconds. Higher currents and magnetic energies were observed in constant-inductance solid-state loads when a better generator-to-load energy coupling was achieved. The load current on Zebra was increased from the nominal 0.80.9 MA up to about 1.6 MA. This result was obtained without modifying the generator energetics or architecture and it is in good agreement with the presented numerical simulations. Validation of the LCM technique at a nanosecond time scale is of importance for the high-energy-density physics research. (10.1103/PhysRevSTAB.13.010401)
DOI : 10.1103/PhysRevSTAB.13.010401
A simple model of intrinsic rotation in high confinement regime tokamak plasmas
- Gürcan Özgür D.
- Diamond P.H.
- Mcdevitt C.J.
- Hahm T.S.
Physics of Plasmas, American Institute of Physics, 2010, 17, pp.032509. A simple unified model of intrinsic rotation and momentum transport in high confinement regime (H-mode) tokamak plasmas is presented. Motivated by the common dynamics of the onset of intrinsic rotation and the L-H transition, this simple model combines E×B shear-driven residual stress in the pedestal with a turbulent equipartition pinch to yield rotation profiles. The residual stress is the primary mechanism for buildup of intrinsic rotation in the H-mode pedestal, while the pinch drives on-axis peaking of rotation profiles. Analytical estimates for pedestal flow velocities are given in terms of the pedestal width, the pedestal height, and various model parameters. The predicted scaling of the toroidal flow speed with pedestal width is found to be consistent with the International Tokamak Physics Activity database global scaling of the flow speed on-axis with the total plasma stored energy. (10.1063/1.3339909)
DOI : 10.1063/1.3339909
A comparison of global models for the solar wind interaction with Mars
- Brain D.
- Barabash S.
- Boesswetter A.
- Bougher S.
- Brecht S.
- Chanteur Gérard
- Hurley D.
- Dubinin Eduard
- Fang X.
- Fraenz M.
- Halekas J.
- Harnett E.
- Holmstrom M.
- Kallio E.
- Lammer H.
- Ledvina S.
- Liemohn M.
- Liu K.
- Luhmann J.
- Ma Y.
- Modolo Ronan
- Nagy A.
- Motschmann U.
- Nilsson Hans
- Shinagawa H.
- Simon Sunil
- Terada N.
Icarus, Elsevier, 2010, 206 (1), pp.139-151. We present initial results from the first community-wide effort to compare global plasma interaction model results for Mars. Seven modeling groups participated in this activity, using MHD, multi-fluid, and hybrid assumptions in their simulations. Moderate solar wind and solar EUV conditions were chosen, and the conditions were implemented in the models and run to steady state. Model output was compared in three ways to determine how pressure was partitioned and conserved in each model, the location and asymmetry of plasma boundaries and pathways for planetary ion escape, and the total escape flux of planetary oxygen ions. The two participating MHD models provided similar results, while the five sets of multi-fluid and hybrid results were different in many ways. All hybrid results, however, showed two main channels for oxygen ion escape (a pickup ion 'plume' in the hemisphere toward which the solar wind convection electric field is directed, and a channel in the opposite hemisphere of the central magnetotail), while the MHD models showed one (a roughly symmetric channel in the central magnetotail). Most models showed a transition from an upstream region dominated by plasma dynamic pressure to a magnetosheath region dominated by thermal pressure to a low altitude region dominated by magnetic pressure. However, calculated escape rates for a single ion species varied by roughly an order of magnitude for similar input conditions, suggesting that the uncertainties in both the current and integrated escape over martian history as determined by models are large. These uncertainties are in addition to those associated with the evolution of the Sun, the martian dynamo, and the early atmosphere, highlighting the challenges we face in constructing Mars' past using models. (10.1016/j.icarus.2009.06.030)
DOI : 10.1016/j.icarus.2009.06.030
Formation of a sodium ring in Mercury's magnetosphere
- Yagi Manabu
- Seki K.
- Matsumoto Y.
- Delcourt Dominique C.
- Leblanc François
Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2010, 115 (A10), pp.A10253. We have performed a statistical analysis of exospheric sodium ion paths in Mercury's magnetosphere under northward interplanetary magnetic field conditions. Electric and magnetic field models used in the simulation were obtained from a global MHD simulation model, whereas the initial conditions of test Na+ ions were derived from a sodium exosphere model. We observe the formation of a ring-shaped high-pressure region consisting of energetic sodium ions traveling around the planet close to the equatorial plane. The configuration of this "sodium ring" as well as the acceleration processes leading to its formation strongly depend on the solar wind conditions. When the dynamic pressure is low, most of the Na+ are picked up in the magnetosphere and accelerated by the large-scale convective electric field. In contrast, in the case of high dynamic pressure, ions that are picked up in the magnetosheath and penetrate into the magnetosphere significantly contribute to the sodium ring. The configuration of this ring also depends upon the intensity of the solar wind electric field. Our analysis reveals that the pressure built by the Na+ ions may be significant as compared to the MHD pressure around the planet. (10.1029/2009JA015226)
DOI : 10.1029/2009JA015226
Non adiabatic electron behavior through a supercritical perpendicular collisionless shock: Impact of the shock front turbulence
- Savoini Philippe
- Lembège Bertrand
Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2010, 115 (A11), pp.A11103. Adiabatic and nonadiabatic electrons transmitted through a supercritical perpendicular shock wave are analyzed with the help of test particle simulations based on field components issued from 2 − D full-particle simulation. A previous analysis (Savoini et al., 2005) based on 1 − D shock profile, including mainly a ramp (no apparent foot) and defined at a fixed time, has identified three distinct electron populations: adiabatic, overadiabatic, and underadiabatic, respectively, identified by μds/μus ≈ 1, >1 and <1, where μus and μds are the magnetic momenta in the upstream and downstream regions. Presently, this study is extended by investigating the impact of the time evolution of 2 − D shock front dynamics on these three populations. Analysis of individual time particle trajectories is performed and completed by statistics based on the use of different upstream velocity distributions (spherical shell of radius vshell and a Maxwellian with thermal velocity vthe). In all statistics, the three electron populations are clearly recovered. Two types of shock front nonstationarity are analyzed. First, the impact of the nonstationarity along the shock normal (due to the front self-reformation only) strongly depends on the values of vshell or vthe. For low values, the percentages of adiabatic and overadiabatic electrons are almost comparable but become anticorrelated under the filtering impact of the self-reformation; the percentage of the underadiabatic population remains almost unchanged. In contrast, for large values, this impact becomes negligible and the adiabatic population alone becomes dominant. Second, when 2 − D nonstationarity effects along the shock front (moving rippling) are fully included, all three populations are strongly diffused, leading to a larger heating; the overadiabatic population becomes largely dominant (and even larger than the adiabatic one) and mainly contributes to the energy spectrum. (10.1029/2010JA015381)
DOI : 10.1029/2010JA015381
Bilan et Perspective 2006 - 2009, Programme National Soleil Terre
- Fontaine Dominique
- Vilmer N.
, 2010.
Bepi-Colombo : Mercury Exploration
- Chanteur Gérard
Flash X - La revue scientifique de l'Ecole polytechnique, Ecole polytechnique, 2010, 12, pp.32-33. ISSN : 1775-0385
Plasmas Naturels : Le Programme National Soleil - Terre
- Fontaine Dominique
Flash X - La revue scientifique de l'Ecole polytechnique, Ecole polytechnique, 2010, 12, pp.27-31. ISSN : 1775-0385
Plasmas froids
- Booth Jean-Paul
- Chabert Pascal
Flash X - La revue scientifique de l'Ecole polytechnique, Ecole polytechnique, 2010, 12, pp.3-5. ISSN : 1775-0385
Plasma assisted ignition and combustion
- Starikovskaia Svetlana
- Starikovskii A.Yu.
, 2010, pp.71-93.
Modelling of an afterglow plasma in air produced by a pulsed discharge
- Pintassilgo C.D.
- Guerra V.
- Guaitella Olivier
- Rousseau Antoine
Plasma Sources Science and Technology, IOP Publishing, 2010, 19, pp.055001. A kinetic model is developed to study the afterglow plasma of a pulsed discharge in air. This model includes a detailed analysis of the temporal evolution of heavy species during the pulse, followed by their relaxation in the afterglow. The predicted results are compared with two experimental sets performed in the time afterglow of a pulsed discharge in N220%O2 at a pressure p = 133 Pa involving the measurements of (i) N2(B) and N2(C) fluorescences for a discharge current I = 40 mA and a pulse duration τ = 200 µs and 10 ms, together with (ii) the absolute concentration of NO(X) for I = 40 and 80 mA with τ varying from 1 to 4 ms. The results of the model agree reasonably well with the measurements of N2(B) and N2(C) decays. It is shown that under these experimental conditions, N2(B) is always populated mainly via the process N2(A) N2(X, 5 ≤ v ≤ 14) → N2(B) N2(X, v = 0), while the relaxation of N2(C) is dominated by the pooling reaction N2(A) N2(A) → N2(C) N2(X, v = 0). An almost constant concentration of NO(X) is experimentally observed until the remote afterglow, but the present model is only capable of predicting the same order of magnitude for afterglow times t 0.05 s. Several hypotheses are discussed and advanced in order to explain this discrepancy. (10.1088/0963-0252/19/5/055001)
DOI : 10.1088/0963-0252/19/5/055001

Retour aux années