Publications

2017

• Single-mode nanosecond Ti: Sapphire laser for high resolution Two-photon Absorption Laser Induced-Fluorescence (TALIF)
  
  • Marinov Daniil
  • Blondel Christophe
  • Booth Jean-Paul
  • Guaitella Olivier
  • Lottigier Pierre
  • Drag Cyril
  , 2017, pp.Paper# CH_3_3. One of the most important, and difficult to measure, parameters of laboratory discharges in molecular gases is the gas translational temperature. We measure, with excellent spatial and temporal resolution, the velocity distribution of oxygen ground-state atoms in plasmas from the Doppler broadening of their laser excitation spectra. The method is based on the well-known Two-Photon Absorption Laser-induced Fluorescence (TALIF) technique, but uses a specially-built pulsed tunable ultraviolet laser with very narrow bandwidth which allows the Doppler profiles to be measured with high precision. This laser consists of a pulsed Nd:YAG-pumped Ti:Sapphire ring cavity which is injection-seeded by a singlemode cw Diode laser. The single-mode infrared output pulses are frequency quadrupled by two non-linear crystals to reach the necessary UV wavelength (226 nm, 0.2 mJ) for TALIF excitation.
• Numerical and experimental study of Hall-effect thrusters
  
  • Croes Vivien
  • Tavant Antoine
  • Lafleur Trevor
  • Martorelli Roberto
  • Bourdon Anne
  • Chabert Pascal
  , 2017.
• A low temperature 0.35m CMOS technology BSIM3.3 model for space instrumentation: application to a voltage reference design
  
  • Varizat Laurent
  • Sou Gérard
  • Mansour Malik
  • Alison Dominique
  • Rhouni Amine
  , 2017.
• THOR - Turbulence Heating ObserveR
  
  • Retinò Alessandro
  , 2017.
• Study of nanosecond discharges in H2-air mixtures at atmospheric pressure for plasma assisted combustion applications
  
  • Kobayashi Sumire
  • Bonaventura Zdeněk
  • Tholin Fabien
  • Popov Nikolay L.
  • Bourdon Anne
  Plasma Sources Science and Technology, IOP Publishing, 2017, 26 (7), pp.1-12. This paper presents 2D simulations of nanosecond discharges between two point electrodes for four different H2–air mixtures defined by their equivalence ratios phgr (i.e. phi =0, air, phi =0.3, lean mixture, phi =1, stoichiometric mixture and phi =1.5, rich mixture) at atmospheric pressure and at an initial temperature of 1000 K. In a first step, we have shown that the mixture composition has only a very small influence on the discharge dynamics and structure during the streamer phase and up to the formation of the plasma channel between the two point electrodes in H2–air mixtures with phi in [0,1.5]. However, as the plasma channel is formed slightly earlier as the equivalence ratio increases, for a given voltage pulse, the duration of the nanosecond spark phase increases as the equivalence ratio increases. As expected, we have shown that excited states of N2 (and in particular N2(A)) and radicals (and in particular O(D), O(P), H and OH) are very efficiently produced during the voltage pulse after the start of the spark phase. After the voltage pulse, and up to 100 ns, the densities of excited states of N2 and of O(D) decrease. Conversely, most of the O(P), H and OH radicals are produced after the voltage pulse due to the dissociative quenching of electronically excited N2. As for radicals, the gas temperature starts increasing after the start of the spark phase. For all studied mixtures, the density of O(P) atoms and the gas temperature reach their maxima after the end of the voltage pulse and the densities of O(P), H and OH radicals and the maximal gas temperature increase as the equivalence ratio increases. We have shown that the production of radicals is the highest on the discharge axis and the distribution of species after the voltage pulse and up to 100 ns has a larger diameter between the electrodes than close to both electrode tips. As for species, the temperature distribution presents two hot spots close to the point electrode tips. The non-uniform distributions of radical densities and gas temperature obtained after the nanosecond voltage pulse provide accurate initial conditions for 2D reactive flow codes to study the combustion ignition on longer timescales and compare with experiments. (10.1088/1361-6595/aa729a)
  DOI : 10.1088/1361-6595/aa729a
• 3. Capillary nanosecond discharge in molecular gases: high specific deposited energy at high electric fields
  
  • Starikovskaia Svetlana
  , 2017.
• Generation and quantification of nitrogen species in plasma activated water
  
  • Liu Bo
  • Honnorat Bruno
  • Duchesne Constance
  • Dufour Thierry
  • Rousseau Antoine
  , 2017. The plasma activation of liquid media such as water to store reactive oxygen (nitrogen) species (e.g. H2O2, O3, O2-, NO2-, NO3-, NO) gains rising interest in cold plasma community owing to their great potential in medical applications (such as blood coagulation, oncology) but also in agriculture so as to face with contemporary and prospective issues such as organic fertilizers replacement, plants growth velocity increase and seeds dormancy reduction. Effects of cold atmospheric plasma (CAP) treatment have already been demonstrated on seeds germination and on seedling growth. CAP treatments appear therefore as a fast and pollution-free alternative to improve seeds performance and crop yield.
• Solar wind turbulence: recent progress and new challenges
  
  • Sahraoui Fouad
  , 2017.
• Bi-dimensional Particle-In-Cell simulations of Hall thrusters: Electron drift instability and secondary electron emissions
  
  • Croes Vivien
  • Tavant Antoine
  • Lafleur Trevor
  • Bourdon Anne
  • Chabert Pascal
  , 2017.
• Simulation and modeling of PEGASES thruster operated with iodine
  
  • Lucken Romain
  • Chabert Pascal
  • Bourdon Anne
  , 2017. The LPP has built an expertise on the physics of different types of plasma thrusters for over 12 years. An efficient plasma generation is crucial to optimize the overall efficiency of a plasma thurster. Radio-frequency (RF) inductively coupled plasma (ICP) discharges are among the most popular ways to achieve this goal for ion gridded thrusters. PEGASES and NEPTUNE thrusters are two cathode-less prototypes designed at LPP that feature an ICP discharge with gases such as argon, xenon, sulfure hexafluoride (SF6), and iodine (I2). In order to better understand the operation of these thrusters, a benchmarked 2D PIC-Monte-Carlo code initially designed for r-θ simulation of Hall thrusters was adapted to ICP simulation. The heating mechanism is assumed to occur in the direction perpendicular to the simulation plane and is localized in a skin depth near the heating antenna. The power absorbed by the plasma over one RF period is the control parameter of the simulation and the plasma potential is derived from Poisson equation. The electron density at steady state is proportional to the input power and the electron temperature decreases when the background gas pressure increases. The plasma potential is approximately five times the electron temperature given in electron-volts. The plasma potential in steady-state is lower for iodine than for argon. The results are consistent with global models of plasma discharges.
• New methods to determine density, temperature and thermal accommodation coefficient of oxygen atoms
  
  • Booth Jean-Paul
  • Chatterjee Abhyuday
  • Guaitella Olivier
  • Gibson Andrew
  • Drag Cyril
  • d'Oliveira Nelson
  • Nahon Laurent
  , 2017. Oxygen atoms are a key reactive species in many plasma applications. Its absolute density is often determined by two-photon laser-induced fluorescence (TALIF) by comparing the signal amplitude with that obtained from a known density of Xe atoms, as proposed by Niemi et al.[1] However, this method has limited accuracy due to uncertainty in the relative excitation cross-sections and other detector calibration difficulties. Our recent measurements in a DC glow discharge yielded unphysically high values, motivating a search for a new method. Absorption spectroscopy is the most direct and unambiguous method for determining absolute densities. However, under most practical situations the O atoms resonance lines at 130nm are heavily saturated (OD of 100 or more) and cannot be used. We measured the vacuum ultraviolet absorption spectrum of O2 discharges at high (106) resolution using the Fourier-Transform Spectrometer[2] on the DESIRS beamline at Synchrotron Soleil, and succeeded in observing the forbidden 3P25S2 transition at 135.56nm. This transition is not saturated, allowing the O atom density to be determined with high accuracy and the TALIF method to be tested. Another key parameter in plasmas is the gas translational temperature, and the thermal accommodation coefficient at reactor walls. We have developed a method to determine the temperature of O atoms from the Doppler width of the TALIF transition, using a home-built narrow bandwidth (0.01cm-1 @ 226nm) pulsed laser system [3], and will use this to determine the temperature profiles in an O2 ICP, and hence the surface thermal accommodation coefficients. Work supported by LABEX Plas@par / ANR-11-IDEX-0004-02.
• The Sun Earth connections
  
  • Amory-Mazaudier Christine
  , 2017. same as USRI conference in March 2017 Sun and Earth two magnetic bodies in motion Emission from the Sun Sunspot cycle Solar Dynamo: the true solar cycle / solar indices Regular Radiation channel Ionosphere / Ionospheric dynamo Disturbed Radiation channel Solar flare Regular ParticlesParticles channel Regular solar wind Disturbed Particles channel : Magnetic storm CME, Coronal Hole Coupling between high and low latitudes Auroral zone Thermal expansion of the atmosphere, PPEF, DDEF The Equatorial Ionosphere Case study : showing the importance of systemic analysis
• Modelling Inductively coupled plasmas in molecular gases : the role of gas heating and fundamental collision processes
  
  • Gibson Andrew
  , 2017.
• Experimental Benchmarks and sensitivity analysis of PIC/MC simulations of oxygen CCP's
  
  • Donko Z.
  • Derszi Aranka
  • Bruneau Bastien
  • Gibson Andrew
  • Johnson E.V.
  • O'Connell D.
  • Gans T.
  • Booth Jean-Paul
  • Schulze J.
  , 2017.
• Simulation of nanosecond spark discharges for plasma assisted combustion applications
  
  • Bourdon Anne
  , 2017.
• 2 Dimensional PIC/MCC simulations of RF CCPs with dielectric side wall: non-uniformity in electron heating
  
  • Liu Yue
  • Booth Jean-Paul
  • Chabert Pascal
  , 2017. Previously plasma non-uniformities in Capacitively Coupled Plasmas were thought to be caused by either an enhanced electric field caused by the proximity of two electrodes, or by an electromagnetic standing wave effect when the exciting frequency is high. We have developed a Particle-In-Cell/Monte Carlo Collision code in 2D Cartesian frame with a dielectric wall at the reactor edge, aiming to investigate the plasma uniformity when the enhanced electric field is shielded by a thick dielectric. Nevertheless, we still observed that the electron density, time-averaged electron power deposition and ionization rate all are non-uniform, with maxima adjacent to x he dielectric edge. The axially-integrated electron power density peaks closer to this edge than the electron density. Electrons are predominantly heated by the axial electric field, Ez, which has strong RF oscillations while Ex is essentially DC. By calculating different components of the electron heating and using an analytical model, we found that this non-uniformity in electron heating results from enhanced Ohmic heating as electron density decreases towards the x edge.
• 2D simulations of Hall effect thrusters
  
  • Croes Vivien
  • Tavant Antoine
  • Lafleur Trevor
  • Bourdon Anne
  • Chabert Pascal
  , 2017.
• LPPic2D: A versatile 2D PIC/MCC code for plasma thrusters simulations
  
  • Lucken Romain
  • Tavant Antoine
  • Croes Vivien
  • Mainassara Wahid
  • Lafleur Trevor
  • Chabert Pascal
  • Bourdon Anne
  , 2017.
• HORIZON 2020 EuPRAXIA Design Study
  
  • Walker Paul Andreas
  • Alesini David
  • Alexandrova Alexandra
  • Anania Maria Pia
  • Andreev Nikolay
  • Assmann Ralph
  • Audet Thomas
  • Bacci Alberto
  • Barna Imre
  • Beaton Andrew
  • Beck Arnaud
  • Beluze Audrey
  • Bernhard Axel
  • Bielawski Serge
  • Bisesto Fabrizio
  • Bödewadt Joern
  • Brandi Fernando
  • Bringer Olivier
  • Brinkmann Reinhard
  • Bründermann Erik
  • Bussolino Giancarlo
  • Buescher Markus
  • Chancé Antoine
  • Chen Min
  • Chiadroni Enrica
  • Cianchi Alessandro
  • Clarke James
  • Couprie Marie-Emmanuelle
  • Croia Michele
  • Cros Brigitte
  • Dale John
  • Dattoli Giuseppe
  • Delerue Nicolas
  • Delferrière Olivier
  • Delinikolas Panagiotis
  • Dias João
  • Dorda Ulrich
  • Ertel Klaus
  • Ferran Pousa Ángel
  • Ferrario Massimo
  • Filippi Francesco
  • Fils Jérôme
  • Fiorito Ralph
  • Fonseca Ricardo
  • Galimberti Marco
  • Gallo Alessandro
  • Garzella David
  • Gastinel Philippe
  • Giove Dario
  • Giribono Anna
  • Gizzi Leonida
  • Grüner Florian
  • Habib A. Fahim
  • Haefner Leon
  • Heinemann Thomas
  • Hidding Bernhard
  • Holzer Bernhard
  • Hooker Simon
  • Hosokai Tomonao
  • Jaroszynski Dino
  • Joshi Chan
  • Kaluza Malte
  • Karger Oliver
  • Karsch Stefan
  • Khazanov Efim
  • Khikhlukha Danila
  • Knetsch Alexander
  • Kocon Dariusz
  • Koester Petra
  • Kononenko Olena
  • Korn Georg
  • Kostyukov Igor
  • Labate Luca
  • Lechner Christoph
  • Leemans Wim
  • Lehrach Andreas
  • Li Fei Yu
  • Li Xiangkun
  • Lifschitz Agustin
  • Litvinenko Vladimir
  • Lu Wei
  • Maier Andreas
  • Malka Victor
  • Manahan Grace
  • Mangles Stuart
  • Marchetti Barbara
  • Marocchino Alberto
  • Martinez de La Ossa Alberto
  • Martins Joana
  • Masaki Kando
  • Massimo Francesco
  • Mathieu Francois
  • Maynard Gilles
  • Mehrling Timon
  • Molodozhentsev Alexander
  • Mosnier Alban
  • Mostacci Andrea
  • Müller Anke-Susanne
  • Najmudin Zulfikar
  • Nghiem Phu Anh Phi
  • Nguyen Federico
  • Niknejadi Pardis
  • Osterhoff Jens
  • Papadopoulos Dimitrios
  • Patrizi Barbara
  • Pattathil Rajeev
  • Petrillo Vittoria
  • Pocsai Mihály
  • Poder Kristjan
  • Pompili Riccardo
  • Pribyl Lukas
  • Pugacheva Daria
  • Romeo Stefano
  • Rossi Andrea
  • Sahai Aakash
  • Sano Yoshinobu
  • Scherkl Paul
  • Schramm Ulrich
  • Schroeder Carl
  • Schwindling Jerome
  • Scifo Jessica
  • Serafini Luca
  • Sheng Zhengming
  • Silva Luis
  • Simon Claire
  • Sinha Ujjwal
  • Specka Arnd
  • Streeter Matthew
  • Svystun Elena
  • Symes Daniel
  • Szwaj Christophe
  • Tauscher Gabriele
  • Thomas Alec
  • Thompson Neil
  • Toci Guido
  • Tomassini Paolo
  • Vaccarezza Cristina
  • Vannini Matteo
  • Vieira Jorge
  • Villa Fabio
  • Wahlstrom Claes-Goran
  • Walczak Roman
  • Weikum Maria
  • Welsch Carsten
  • Wolfenden Joseph
  • Xia Guoxing
  • Yabashi Makina
  • Yu Lule
  • Zhu Jun
  • Zigler Arie
  , 2017, 874, pp.TUOBB3. The Horizon 2020 Project EuPRAXIA ('European Plasma Research Accelerator with eXcellence In Applications') aims at producing a design report of a highly compact and cost-effective European facility with multi-GeV electron beams using plasma as the acceleration medium. The accelerator facility will be based on a laser and/or a beam driven plasma acceleration approach and will be used for photon science, high-energy physics (HEP) detector tests, and other applications such as compact X-ray sources for medical imaging or material processing. EuPRAXIA started in November 2015 and will deliver the design report in October 2019. EuPRAXIA aims to be included on the ESFRI roadmap in 2020. (10.18429/JACoW-IPAC2017-TUOBB3)
  DOI : 10.18429/JACoW-IPAC2017-TUOBB3
• BSIM3 parameters extraction of a 0.35 µm CMOS technology from 300K down to 77K
  
  • Varizat Laurent
  • Sou Gérard
  • Mansour Malik
  Journal of Physics: Conference Series, IOP Science, 2017, 834 (Conference : 1). In this work, we present a commercial 0.35 μm/3.3 V CMOS technology behaviour study of both linear and gate-enclosed transistors from room temperature down to 77 Kelvin. Cryogenic setup used to complete this study is first described. Measurement results are then discused and a model based on a BSIM3 parameters extraction is proposed. (10.1088/1742-6596/834/1/012002)
  DOI : 10.1088/1742-6596/834/1/012002
• Fluctuation measurements in Laboratory Plasmas
  
  • Hennequin Pascale
  , 2017. http://ipag.osug.fr/~lesurg/plasmas2017/program.html,
• Global structure and heavy ion distributions in Mercury's magnetosphere
  
  • Yagi Manabu
  • Seki Kanako
  • Matsumoto Yuji
  • Delcourt Dominique
  • Leblanc François
  , 2017.
• Reconnection in natural plasmas, From laboratories to astrophysics: the expanding universe of plasma physics
  
  • Retinò Alessandro
  , 2017.
• Climatology of Guinea: Study of Climate Variability in N’zerekore
  
  • Loua René Tato
  • Beavogui Maoro
  • Bencherif Hassan
  • Barry Alpha Boubacar
  • Bamba Zoumana
  • Amory-Mazaudier Christine
  Journal of Agricultural Science and Technology (JAST), University of Tarbiat Modares, 2017, 7 (4). N'zerekore is a geographical region of Guinea, which houses a weather observatory located at longitude 8.8°, latitude 7.7° and altitude 475 m. This region is of major socioeconomic interest for the country. The climatological study of this region shows the variability of each parameter. The objective of this study was to analyze meteorological parameters trends and to assess the space-time evolution of some agro-climatic risks related to the main trends observed in the meteorological parameters regime of this region. In this study, programming tools were used for processing and analyzing meteorological parameters data, including temperatures, rains, wind, evaporation and storms measured in this observatory from 1931 to 2014. The interannual, annual and daily variations of these parameters were obtained, as well as temperature, precipitation anomalies and agroclimatic indexes trends. The analyzing of these variations explained that September is the rainiest months, and the year 1932, 1957 and 1970 are normal, rainy and dry year, respectively. The evaporation increased since 1971 from January to March and November to December. A positive temperature anomaly was observed since 1973 with the maximum 26-33 °C and the minimum 16-21 °C. A dominant westerly wind with a speed of 2.6 m/s was determined. Agro-climatic parameters in N'zerekore have high variability. From 1931 to 2014, three major periods can be distinguished: a wet period from 1931 to 1977, a dry period from 1978 to 1994 and rainfall variability from 1995 to 2014. The trend of these parameters explains the impact of climate change in this part of the world. This is exacerbated by human activity (deforestation), thus mitigation measures are necessary. It would be useful to extend this study throughout the country. (10.17265/2161-6256/2017.04.001)
  DOI : 10.17265/2161-6256/2017.04.001
• Quasi-adiabatic transport in Mercury's magnetotail
  
  • Delcourt Dominique
  • Malova H. V.
  • Zelenyi L. M.
  , 2017, 19, pp.2658. MESSENGER observations have revealed that the magnetotail of Mercury is fairly dynamical, possibly subjected to series of magnetic field line dipolarization on time scales of a few seconds. Because of the sharp reversal of the magnetic field, ions may not travel adiabatically in this region of space, and their behavior can be organized according to different categories. Among these categories, quasi-adiabatic (Speiser) ions are such that they experience negligible net change of magnetic moment upon crossing of the field reversal and can thus travel back to low altitudes. We examine the robustness of this quasi-adiabatic behavior during magnetic field line dipolarization where ions are subjected to a large induced electric field. We demonstrate that, although this surging electric field possibly yields substantial nonadiabatic heating, quasi-adiabaticity is robust for ions with velocities larger than the peak ExB drift speed, a behavior that we refer to as "strong" quasi-adiabaticity (as opposed to "weak" quasi-adiabaticity that is violated during dipolarization). We show that the impulsive energization of such quasi-adiabatic ions during dipolarization events can lead to prominent energy-time dispersion structures at low altitudes.