Publications

2012

• Characterization of Zn X-Ray Laser at PALS Centre, Its Applications in Dense Plasma Probing and Astrophysics
  
  • Kozlova M.
  • Nejdl J.
  • Krus M.
  • Prokupek J.
  • Dostal J.
  • Rus B.
  • Klisnick A.
  • Meng L.
  • Tissandier F.
  • Stehle C.
  • Lefevre R.
  • Chaulagain U.
  • Champion N.
  • Barroso P.
  • Reix F.
  • Jagourel P.
  • Larour Jean
  • Delmotte Franck
  • Constancias C.
  • Suzuki-Vidal F.
  • Acef O.
  , 2014, 147, pp.151. This report presents the results from experiments at PALS Centre using a Zn X-ray laser with the pulse length of 0.15 ns and the wavelength of 21.2 nm, working in single or double pass regime with the output energy of 0.4 mJ or 4 mJ per pulse, respectively. The current X-ray laser was experimentally examined to obtain its temporal coherence and spectral width using a path-difference interferometer. The double pass regime shows that QSS plasma based source-amplifier is promising for "short" fs soft X-ray pulses. The X-ray laser is commonly used for user's experiments. Its advantages can be shown in applications such as probing of dense plasmas (up to 2.5 x 10(24) cm(-3)) or single shot experiments (4 x 10(14) photons/pulse). The simple technique based on Talbot effect was used to obtain the gradients of electron densities of line plasmas produced under conditions corresponding to XRL's amplifiers operating in TCE and QSS regime. To investigate radiative shock wave in laboratory is challenging in aspects of the optimization of experimental parameters. Due to the high electron density (10(22) cm(-3)) produced in the gas medium propagated by the shock wave, the velocity of the shock wave, and the absorption losses on optical elements, it is necessary to use the energetic single shot probe. (10.1007/978-3-319-00696-3_24)
  DOI : 10.1007/978-3-319-00696-3_24
• Critical Components for XUV Probing of Laser Driven Shocks
  
  • Stehle C.
  • Lefèvre R.
  • Chaulagain U.
  • Champion N.
  • Barroso P.
  • Reix F.
  • Jagourel P.
  • Larour Jean
  • Meltchakov E.
  • Mercier R.
  • Delmotte Franck
  • Kozlova M.
  • Nejdl J.
  • Krus M.
  • Dostal J.
  • Prokupek J.
  • Constancias C.
  • Suzuki-Vidal F.
  • Acef O.
  , 2014, vol 147, chapter 39, pp.239. Radiative shocks can be produced in gases using high-energy lasers. As the electron density may be higher than the critical density for visible light, radiography with soft x-ray radiation becomes very promising technique to probe these shocks. Feasibility of this method has been proven employing zinc soft x-ray laser at 21.2 nm as backlighter. The experiment has shown high requirements on quality of the imaging optics and windows of the gas filled cell. (10.1007/978-3-319-00696-3_39)
  DOI : 10.1007/978-3-319-00696-3_39
• Laboratory experiments of radiative shocks in the context of stellar accretion.
  
  • Chaulagain Uddhab
  • Stehlé Chantal
  • de Sá Lionel
  • Larour Jean
  • Auvray Philippe
  • Kozlová M.
  • Krus M.
  • Dostal J.
  • Propupek J
  • Suzuki-Vidal F.
  • Barroso P.
  • Reix F.
  • Acef O.
  • Ciardi Andrea
  , 2012. High-energy lasers are used to simulate astrophysical phenomena in the laboratory. The PALS laser facility, with a typical irradiance of 10 14 W.cm −2 , allows in particular to produce radiative shocks in high atomic number gases. The system is optimized for reaching conditions where the shock is radiative, i.e. it presents a "radiative precursor". This kind of shock is expected to occur during various astrophysical accretion processes. We present preliminary experimental results with emphasis on two diagnostics, namely the study of the laser impact on the target and an instantaneous imaging using an X-ray laser.
• Direction for the future
  
  • Aanesland Ane
  , 2012. https://cas.web.cern.ch/cas/Slovakia-2012/Senec-advert.html
• Plasmas filamentaires aux interfaces solides et liquides
  
  • Rousseau Antoine
  , 2012.
• Status of the Laser Based Production, Acceleration and Neutralization of High Current and High Energy Neutral H (or D) Beam for Demo Applications
  
  • Moustaizis Stavros
  • Auvray Philippe
  • Larour Jean
  • Perrakis C.
  • Balcou Philippe
  , 2012. communication orale
• Effect of fast positive ions incident on caesiated plasma grid of negative ion source
  
  • Bacal M.
  , 2012.
• Evolution de la FDEE et de la température électronique au travers de différentes configurations de champs magnétiques
  
  • Bredin Jérôme
  • Aanesland Ane
  • Chabert Pascal
  • Godyak Valery
  , 2012.
• Influence d'une Fraction d'Electrons sur la Formation de Gaine dans les Plasmas Electronegatifs
  
  • Oudini N.
  • Meige A.
  • Aanesland Ane
  • Raimbault Jean-Luc
  • Chabert Pascal
  , 2012.
• Observation and theoretical modeling of electron scale solar wind turbulence
  
  • Sahraoui Fouad
  • Huang S. Y.
  • Belmont Gérard
  • Goldstein M. L.
  , 2012.
• Space Weather : An introduction
  
  • Amory-Mazaudier Christine
  , 2012.
• Chlorine atom and molecule dynamics in an inductively coupled plasma in pure Cl<SUB>2</SUB>
  
  • Booth Jean-Paul
  • Chabert Pascal
  • Azamoum Yasmina
  • Sirse Nishant
  , 2012.
• Ozone production in O<SUB>2</SUB> plasma at low pressure: evaluation of surface and gas phase mechanisms
  
  • Marinov Daniil
  • Guaitella Olivier
  • Guerra V.
  • Sirse Nishant
  • Booth Jean-Paul
  • Rousseau Antoine
  , 2012.
• A high dynamic range and low power 16-channel CMOS circuit for particle detection in space plasmas
  
  • Rhouni Amine
  • Techer Jean-Denis
  • Sou Gérard
  • Berthomier Matthieu
  , 2012, pp.2454 - 2457. A low power 16-channel ASIC has been designed in the standard 0.35μm CMOS technology. It includes a Charge-Sensitive-Amplifier (CSA) and a discriminator from noise. It is designed using hard-rad layout rules and can be used as the front-end electronics of a 3D imaging space plasma analyser that includes charged particles multipliers (Micro Channel Plates). With a total power consumption limited to 600μW per channel, the detection chain achieves a gain of 1mV/fC over a wide dynamic range of input charges varying from 4fC to 4pC. The CSA Pulse-Pair-Resolution (PPR) is 250ns providing the ability to reach a minimum particle count rate of 4MHz periodic per channel. By adjusting the threshold of discrimination from noise to the limited dynamic range of standard MCP, it is suggested that particle count rates as high as 10MHz periodic can be achieved with this low power ASIC while classical hybrid space qualified components with a similar count rate capability have a power consumption of 25mW per channel. (10.1109/I2MTC.2012.6229513)
  DOI : 10.1109/I2MTC.2012.6229513
• Electron energy distribution function and plasma parameters across magnetic filters
  
  • Bredin Jérôme
  • Aanesland Ane
  • Chabert Pascal
  • Godyak V.
  , 2012.
• Champ magnétique terrestre, Courants équivalents et indices magnétiques
  
  • Amory-Mazaudier Christine
  , 2012.
• Modifying locally the safety profile to improve the confinement of magnetic field lines in tokamak plasmas
  
  • Constantinescu D.
  • Firpo Marie-Christine
  Nuclear Fusion, IOP Publishing, 2012, 52 (5), pp.054006. Using Hamiltonian models for the magnetic field lines, we propose a methodology to improve their confinement through the creation of transport barriers. A local modification of the safety profile creating a low-shear zone is shown to be sufficient to locally enhance drastically the regularity of the magnetic field lines without requesting a reversed shear. The optimal benefits of low-shear are obtained when the value q0 of the safety profile in the low-shear zone is sufficiently far from the main resonance values m/n with low m and n, in the case of large enough values of those (m, n) mode amplitudes. A practical implementation in tokamak plasmas should involve electron cyclotron current drive to locally modify the magnetic shear. (10.1088/0029-5515/52/5/054006)
  DOI : 10.1088/0029-5515/52/5/054006
• Les courants électriques dans l'environnement terrestre sources des variations transitoires du champ magnétique terrestre
  
  • Amory-Mazaudier Christine
  , 2012.
• Operation of the PEGASES thruster with Xe
  
  • Gerst Dennis
  • Mazouffre Stéphane
  • Aanesland Ane
  , 2012.
• PEGASES - Plasma Propulsion with Electronegative gases - A status update
  
  • Aanesland Ane
  • Popelier Lara
  • Bredin Jérôme
  • Chabert Pascal
  • Mazouffre Stéphane
  , 2012.
• Control and Mapping of X-Ray Emission in a Laser-Plasma Accelerator
  
  • Thaury Cédric
  • Corde Sébastien
  • Ta Phuoc Kim
  • Lifschitz Agustin
  • Fitour Romuald
  • Faure Jérôme
  • Lambert Guillaume
  • Lundh O.
  • Benveniste, E.
  • Ben-Ismaïl Ahmed
  • Arantchouk Léonid
  • Alexandre Marciniak
  • Adrien Stordeur
  • Brijesh P.
  • Arnd Specka
  • Malka Victor
  • Rousse Antoine
  , 2012. We show that the control and the mapping of the x-ray emission reveals unique features of the laser-plasma accelerator physics, including strong correlations between electron and x-ray beams, and density-dependence of electron injection position. (C) 2011 Optical Society of America (10.1364/QELS.2012.QW3F.5)
  DOI : 10.1364/QELS.2012.QW3F.5
• Tesla coil discharges guided by femtosecond laser filaments in air
  
  • Brelet Yohann
  • Houard Aurélien
  • Arantchouk Léonid
  • Forestier Benjamin
  • Liu Yi
  • Prade Bernard
  • Carbonnel Jérôme
  • André Yves-Bernard
  • Mysyrowicz André
  Applied Physics Letters, American Institute of Physics, 2012, 100 (18), pp.181112. A Tesla coil generator was designed to produce high voltage pulses oscillating at 100 kHz synchronisable with a nanosecond temporal jitter. Using this compact high voltage generator, we demonstrate reproducible meter long discharges in air at a repetition rate of 1 Hz. Triggering and guiding of the discharges are performed in air by femtosecond laser filaments. (10.1063/1.4711208)
  DOI : 10.1063/1.4711208
• In situ observations of reconnection and associated particle energization in turbulent plasmas
  
  • Retinò Alessandro
  • Sundkvist D.
  • Vaivads A.
  • Sahraoui Fouad
  , 2012, 14, pp.6773.
• Solar wind turbulence at kinetic scales
  
  • Alexandrova O.
  • Rossi C.
  • Mangeney A.
  • Grappin Roland
  • Carbone V.
  , 2012, 14, pp.9963. Solar wind is a turbulent magnetized collisionless plasma. Kolmogorov's turbulent spectrum is widely observed at magnetohydrodynamic scales. At smaller scales, i.e. at scales of the order of the kinetic plasma scales (such as Larmor radii of charged particles or their inertial lengths, ~ 50 km for protons and ~ 2 km for electrons), turbulence is less studied and is a matter of debate. In this presentation we review different observations related to kinetic range, such as magnetic spectra, signatures of multi- and mono-fractality, wave vector anisotropy and indications of different wave modes. Then, we will show new results related to intermittency and coherent structures present within this range.
• Variability of ULF wave power at the magnetopause: a study at low latitude with Cluster data
  
  • Cornilleau-Wehrlin Nicole
  • Grison B.
  • Belmont Gérard
  • Rezeau Laurence
  • Chanteur Gérard
  • Robert Patrick
  • Canu Patrick
  , 2012, 14, pp.9562. Strong ULF wave activity has been observed at magnetopause crossings since a long time. Those turbulent-like waves are possible contributors to particle penetration from the Solar Wind to the Magnetosphere through the magnetopause. Statistical studies have been performed to understand under which conditions the ULF wave power is the most intense and thus the waves can be the most efficient for particle transport from one region to the other. Clearly the solar wind pressure organizes the data, the stronger the pressure, the higher the ULF power (Attié et al 2008). Double STAR-Cluster comparison has shown that ULF wave power is stronger at low latitude than at high latitude (Cornilleau-Wehrlin et al, 2008). The different studies performed have not, up to now, shown a stronger power in the vicinity of local noon. Nevertheless under identical activity conditions, the variability of this power, even at a given location in latitude and local time is very high. The present work intends at understanding this variability by means of the multi spacecraft mission Cluster. The data used are from spring 2008, while Cluster was crossing the magnetopause at low latitude, in particularly quite Solar Wind conditions. The first region of interest of this study is the sub-solar point vicinity where the long wavelength surface wave effects are most unlikely.