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.
• Observation and theoretical modeling of electron scale solar wind turbulence
  
  • Sahraoui Fouad
  • Huang S. Y.
  • Belmont Gérard
  • Goldstein M. L.
  , 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.
• 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.
• PEGASES - Plasma Propulsion with Electronegative gases - A status update
  
  • Aanesland Ane
  • Popelier Lara
  • Bredin Jérôme
  • Chabert Pascal
  • Mazouffre Stéphane
  , 2012.
• Operation of the PEGASES thruster with Xe
  
  • Gerst Dennis
  • Mazouffre Stéphane
  • Aanesland Ane
  , 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
• Energetic electron acceleration at reconnection jet fronts in planetary magnetotails
  
  • Retinò Alessandro
  • Vaivads A.
  • Zieger B.
  • Nakamura R.
  • Fujimoto M.
  • Kasahara S.
  • Badman S. V.
  • Masters A.
  • Coates A. J.
  • Dougherty M. K.
  , 2012, 14, pp.6754. Magnetic reconnection plays a crucial role for energetic particle acceleration in many astrophysical environments. Important examples are the solar corona and planetary magnetospheres. A number of recent numerical simulations as well as in situ observations in planetary magnetotails indicate that strong acceleration occurs at reconnection jet fronts, the boundary separating jetting from ambient plasma, and in jet braking regions, where jets eventually stop/dissipate. Yet the details of the acceleration mechanisms are not completely understood. Here we present observations of jet fronts and associated energetic electron acceleration in both Earth's and Saturn's magnetotails, by using Cluster and Cassini spacecraft data. We discuss differences/similarities in the properties of accelerated electrons and electromagnetic fields between the two cases.
• Europlanet-RI: Access to Planetary Data, Tools, Models and Support Information
  
  • Schmidt Walter
  • Capria Maria Teresa
  • Chanteur Gérard
  , 2012, 14, pp.8120. During the past three years the Europlanet Research Infrastructure consortium with financial support from the EU's 7th framework program has developed a wide range of tools to support all aspects of planetary research. During the final year of the project these are being integrated into the "Integrated and Distributed Information Service IDIS" [1]. The challenge is the diversity of research fields involved in planetary research, each with its own way of collecting and archiving data and publishing its results. Nevertheless the results of one field are needed by others to be able to correctly interpret their observations, and to design new kinds of measurements to advance our knowledge of the Solar system. The IDIS team in close cooperation with the efforts of the International Planetary Data Alliance (IPDA) has developed a data model which allows the registration of a wide range of data sources including the results from modelling efforts thereby providing Virtual Observatory (IDIS-VO) [2,3] services for the community to register and access data from planetary data centres, laboratory measurements, spectral- and molecular data bases and simulations. Once a data set from any of these sources is registered with IDIS, it can be accessed, its used archive format translated into a compatible internal format and combined with other data using the visualization tools developed in connection with IDIS. Tools to calculate ephemeris data for a wide range of solar system bodies, to visualize their locations or identify them from existing images can be found as well as interactive tools to evaluate chemical reaction paths, spectral information from gas or solids or the mapping of planetary surfaces. Additionally information about ground observation possibilities, test facilities, laboratories, research institutes and scientists with detailed contact information is made available to the user. For the developers of new space instruments and operators of active missions support information is collected in the data access system of IDIS. By the end of the project in 2012 data from most planetary missions can be accessed, combined and correlated with spectral data bases for atmospheric gases and solids, laboratory measurements related to space observations and the results of model runs simulating the observations of different parameters around and at planets under various boundary conditions. The VO-structure will allow the access to these data through graphical interfaces including optimized visualization tools or alternatively through a command interface for further integration into other applications. Reference: [1] Details to IDIS and the Europlanet-RI via Web-site: http://www.idis.europlanet-ri.eu/ [2] Demonstrator implementation for Plasma-VO AMDA: http://cdpp-amda.cesr.fr/DDHTML/index.html [3] Demonstrator implementation for the IDIS-VO: http://www.idis-dyn.europlanet-ri.eu/vodev.shtml
• 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.