Publications

2015

• Revealing the second harmonic generation in a femtosecond laser-driven cluster-based plasma by analyzing shapes of Ar XVII spectral lines
  
  • Oks Eugene
  • Dalimier Elisabeth
  • Faenov Anatoly
  • Pikuz Tatiana
  • Fukuda Yuji
  • Andreev Alexander
  • Koga James
  • Sakaki Hironao
  • Kotaki Hideyuki
  • Pirozhkov Alexander
  • Hayashi Yukio
  • Skobelev Igor
  • Pikuz Sergei
  • Kawachi Tetsuya
  • Kando Masaki
  • Kondo Kiminori
  • Zhidkov Alexei
  • Kodama Ryosuke
  Optics Express, Optical Society of America - OSA Publishing, 2015, 23 (25), pp.31991-32005. We present experiments dealing with a femtosecond laser-driven cluster-based plasma, where by analyzing the nonlinear phenomenon of satellites of spectral lines of Ar XVII, we revealed the nonlinear phenomenon of the generation of the second harmonic of the laser frequency. For performing this analysis we developed new results in the theory of satellites of spectral lines. From such lineshape analysis we found, in particular, that the efficiency of converting the short (40 fs) intense (3x10 18 W/cm 2) incident laser light into the second harmonic was 2%. This result is in the excellent agreement with the 2-Dimensional Particle-In-Cell (2D PIC) simulation that we also performed. There is also an order of magnitude agreement between the thresholds for the SHG found from the line shape analysis and from the 2D PIC simulations. (10.1364/OE.23.031991)
  DOI : 10.1364/OE.23.031991
• A novel platform to study magnetized high-velocity collisionless shocks
  
  • Higginson D.P.
  • Korneev Ph
  • Béard J.
  • Chen S.N.
  • d'Humières E.
  • Pépin H.
  • Pikuz S.
  • Pollock B.
  • Riquier R.
  • Tikhonchuk Vladimir T.
  • Fuchs J.
  High Energy Density Physics, Elsevier, 2015, 17, pp.190-197. An experimental platform to study the interaction of two colliding high-velocity (0.01–0.2 c; 0.05–20 MeV) proton plasmas in a high strength (20 T) magnetic field is introduced. This platform aims to study the collision of magnetized plasmas accelerated via the Target-Normal-Sheath-Acceleration mechanism and initially separated by distances of a few hundred microns. The plasmas are accelerated from solid targets positioned inside a few cubic millimeter cavity located within a Helmholtz coil that provides up to 20 T magnetic fields. Various parameters of the plasmas at their interaction location are estimated. These show an interaction that is highly non-collisional, and that becomes more and more dominated by the magnetic fields as time progresses (from 5 to 60 ps). Particle-in-cell simulations are used to reproduce the initial acceleration of the plasma both via simulations including the laser interaction and via simulations that start with preheated electrons (to save dramatically on computational expense). The benchmarking of such simulations with the experiment and with each other will be used to understand the physical interaction when a magnetic field is applied. Finally, the experimental density profile of the interacting plasmas is shown in the case without an applied magnetic magnetic field, so to show that without an applied field that the development of high-velocity shocks, as a result of particle-to-particle collisions, is not achievable in the configuration considered. (10.1016/j.hedp.2014.11.007)
  DOI : 10.1016/j.hedp.2014.11.007
• Phase I Clinical Pharmacology Study of F14512, a New Polyamine-Vectorized Anticancer Drug, in Naturally Occurring Canine Lymphoma
  
  • Tierny D.
  • Serres F.
  • Segaoula Z.
  • Bemelmans I.
  • Bouchaert E.
  • Petain A.
  • Brel V.
  • Couffin S.
  • Marchal T.
  • Nguyen L.
  • Thuru Xavier
  • Ferré P.
  • Guilbaud N.
  • Gomes B.
  Clinical Cancer Research, American Association for Cancer Research, 2015, 21 (23), pp.5314-5323. (10.1158/1078-0432.ccr-14-3174)
  DOI : 10.1158/1078-0432.ccr-14-3174
• Table-top femtosecond soft X-ray laser by collisional ionization gating
  
  • Depresseux A.
  • Oliva E.
  • Gautier J.
  • Nejdl J.
  • Kozlova M.
  • Maynard G.
  • Tafzi A.
  • Kim H T
  • Jacquemot S.
  • Rousseau P.
  • Iaquaniello G.
  • Lefrou T.
  • Flacco A.
  • Vodungbo B.
  • Tissandier F.
  • Goddet Jean-Philippe
  • Lifschitz Agustin
  • Malka Victor
  • Ta Phuoc Kim
  • Thaury Cedric
  • Lambert Guillaume
  • Rousse Antoine
  • Zeitoun Philippe
  • Sebban Stéphane
  Nature Photonics, Nature Publishing Group, 2015, 9 (12), pp.817-821. (10.1038/nphoton.2015.225)
  DOI : 10.1038/nphoton.2015.225
• Interaction between SLC6A4 promoter variants and childhood trauma on the age at onset of bipolar disorders
  
  • Etain B
  • Lajnef M
  • Henrion A
  • Dargél a A
  • Stertz L
  • Kapczinski F
  • Mathieu F
  • Henry C
  • Gard S
  • Kahn J P
  • Leboyer M
  • Jamain S
  • Bellivier F
  Scientific Reports, Nature Publishing Group, 2015, 5, pp.16301. Age at onset (AAO) of bipolar disorders (BD) could be influenced both by a repeat length polymorphism (5HTTLPR) in the promoter region of the serotonin transporter gene (SLC6A4) and exposure to childhood trauma. We assessed 308 euthymic patients with BD for the AAO of their first mood episode and childhood trauma. Patients were genotyped for the 5HTTLPR (long/short variant) and the rs25531. Genotypes were classified on functional significance (LL, LS, SS). A sample of 126 Brazilian euthymic patients with BD was used for replication. In the French sample, the correlation between AAO and trauma score was observed only among 'SS' homozygotes (p = 0.002) but not among 'L' allele carriers. A history of at least one trauma decreased the AAO only in 'SS' homozygotes (p = 0.001). These results remained significant after correction using FDR. Regression models suggested an interaction between emotional neglect and 'SS' genotype on the AAO (p = 0.009) and no further interaction with other trauma subtypes. Partial replication was obtained in the Brazilian sample, showing an interaction between emotional abuse and 'LS' genotype on the AAO (p = 0.02). In conclusion, an effect of childhood trauma on AAO of BD was observed only in patients who carry a specific stress responsiveness-related SLC6A4 promoter genotype. (10.1038/srep16301)
  DOI : 10.1038/srep16301
• Experimental and numerical study of accretion-ejection mechanisms in laboratory astrophysics
  
  • Yurchak Roman
  , 2015. With the development of high power laser facilities able to focus microscopic amounts of energy in less than 1 mm³ and in a few nanoseconds, it became possible to reach High Energy Density (HED) regimes of matter previously found only in planetary and stellar interiors. Laboratory astrophysics thus aims to study certain classes of astrophysical objects in a controlled environment of HED facilities using appropriate scaling laws. The modelling of hydrodynamic plasma flows in such experiments requires the use of numerical tools that will be presented in this thesis work. In particular, we will start by discussing the multi-physics Adaptive Mesh Refinement (AMR) code FLASH that can be used to model laser driven plasma flows. Then, we will discuss the equation of state and opacities necessary to precisely model the experimental conditions. Finally, in a validation effort, a code to code comparison study for MULTI, DUED and FLASH codes will be illustrated with several test cases. In a second part, we will present experimental results related to the accretion-ejection mechanisms in astrophysical objects, and in particular, magnetic Cataclysmic Variables (mCV) and astrophysical jets. The former is a binary star system, where a white dwarf accretes matter from a companion star. The matter is then confined by magnetic field lines and falls with a supersonic velocity onto the white dwarf surface, generating a stationary radiative shock wave in the accretion column. This work is part of the POLAR project and lead to experiments performed on the LULI2000 (France), GEKKO XII (Japan) and Orion (UK) laser facilities. The second type of objects that were studied in this work are astrophysical jets, where matter is ejected from a central compact object, forming plasma flows collimated over large distances. In particular, we have performed an experimental demonstration of the Shock Focused Inertial Confinement (SFIC) mechanism on the LULI2000 laser facility.
• Ultrafast Synchrotron-Enhanced Thermalization of Laser-Driven Colliding Pair Plasmas
  
  • Lobet M.
  • Ruyer C.
  • Debayle A.
  • D’humières E.
  • Grech M.
  • Lemoine M.
  • Gremillet L.
  Physical Review Letters, American Physical Society, 2015, 115 (21). (10.1103/PhysRevLett.115.215003)
  DOI : 10.1103/PhysRevLett.115.215003
• EMISSION X DE PLASMAS CHAUDS HORS EQUILIBRE THERMODYNAMIQUE LOCAL CREES PAR LASER
  
  • Anne-Claire Bourgaux
  , 2015. L’émission X de plasmas hors équilibre thermodynamique local (ETL) de Z moyen ou élevé est particulièrement difficile à modéliser du fait du grand nombre de transitions électroniques à prendre en compte. L’étude du rayonnement X issu des transitions de couches L et M est extrêmement intéressante, d’une part pour la validation des codes numériques (en particulier hors ETL), et d’autre part pour la compréhension de la physique atomique hors ETL dans les plasmas chauds et denses. Des expériences ont donc été développées avec pour enjeu de mesurer le plus complétement possible et de manière indépendante d’une part l’émission X, et d’autre part l’évolution hydrodynamique des plasmas étudiés. Les plasmas ont été créés à l’aide de lasers de puissance à partir de cibles solides, afin d’observer une émission de couche L (brome, niobium) ou M (tantale, tungstène). Le dispositif expérimental qui a été amélioré au cours du temps comportait plusieurs diagnostics hydrodynamiques, en face avant comme en face arrière, permettant une bonne caractérisation de l’évolution du plasma. Les mesures hydrodynamiques ainsi réalisées ont permis de contraindre des simulations numériques décrivant complètement le plasma. Des codes de physique atomique ont ensuite été utilisés pour calculer les spectres dans les conditions hydrodynamiques déterminées à partir des mesures. L'accord obtenu entre spectres expérimentaux et mesurés est bon, particulièrement pour les spectres d'émission de couche M, cependant les calculs manquent encore de détails pour reproduire finement les structures observées, ce qui affecte principalement les spectres d'émission de couche L.
• High-contrast 10-fs OPCPA-based Front-End for the Apollon-10PW laser (Orale)
  
  • Papadopoulos Dimitrios N.
  • Ramirez Patricia
  • Pellegrina A
  • Lebas N.
  • Leblanc Catherine
  • Cheriaux Gilles
  • Zou J-P
  • Mennerat G.
  • Monot P.
  • Mathieu F.
  • Audebert P
  • Georges Patrick
  • Druon Frédéric
  , 2015. We present a high-contrast 10-fs Front-End for Ti:sapphire PW-lasers within the Apollon-10PW project. This injector uses OPCPA pumped at 100 Hz by Yb-based CPA chain. Combination of OPCPA and XPW permits a >10 12 contrast ratio.
• XCAN — A coherent amplification network of femtosecond fiber chirped-pulse amplifiers
  
  • Daniault L.
  • Bellanger S.
  • Le Dortz J.
  • Bourderionnet J.
  • Lallier E.
  • Larat C.
  • Antier-Murgey M.
  • Chanteloup Jean-Christophe
  • Brignon A.
  • Simon-Boisson C.
  • Mourou G.
  The European Physical Journal. Special Topics, EDP Sciences / Springer Verlag, 2015, 224 (13), pp.2609-2613. (10.1140/epjst/e2015-02571-y)
  DOI : 10.1140/epjst/e2015-02571-y
• Étude du comportement collectif des speckles dans le développement de la diffusion Raman stimulée lors de l’interaction laser-plasma
  
  • Glize Kevin
  , 2015. Les instabilités paramétriques qui se développent dans l’interaction laser-plasma à haute intensité dans les plasmas chauds de plusieurs millimètres typiques des expériences de FCI, entrainent des taux de rétrodiffusion importants, ce qui en fait un sujet toujours préoccupant. Les travaux de cette thèse se concentrent sur l’étude d’une des instabilités paramétriques, la diffusion Raman stimulée, dans les cas mono-, bi- et multi-speckles ou points chauds que l’on retrouve dans les taches focales des gros lasers de puissance. Cette étude expérimentale, effectuée en régime picoseconde, a établi la différence des comportements en régime isolé ou collectif de la rétrodiffusion Raman : la modification des propriétés locales du plasma induite par un point chaud intense peut rendre instable un point chaud voisin, stable vis-à-vis de l’instabilité s'il était isolé, par l'intermédiaire d’un couplage cinétique et/ou d'un couplage d'ondes. Une série d’expériences utilisant des diagnostics de diffusion Thomson à hautes résolutions spatiale et temporelle couplées avec une imagerie de la rétrodiffusion Raman a permis de mettre en évidence l'existence de ce comportement collectif, de saisir sa dynamique puis de caractériser à l’échelle picoseconde son influence dans le développement global de l'instabilité Raman en discriminant l’aspect cinétique (électrons suprathermiques) de l’aspect ondulatoire (couplage par l’intermédiaire des ondes excitées par l’instabilité). Les mesures expérimentales bispeckle ont été interprétées à l’aide de simulations particulaires 2D du code CALDER qui reproduit cette discrimination entre ces deux types de perturbations.
• Caractérisation des plasmas chauds et denses produits par interaction laser à ultra-haute intensité d'une cible solide
  
  • Dervieux Vincent
  , 2015. Les propriétés radiatives de plasmas denses et chauds conditionnent de nombreux phénomènes rencontrés dans les intérieurs stellaires et dans le cadre de la fusion par confinement inertielle. Afin d’améliorer les modèles dans un régime à la fois proche du solide (de l’ordre du g.cm-3) et de plusieurs centaines d’électron-Volts, des mesures en laboratoire sont aujourd’hui nécessaires. L’étude menée dans cette thèse consiste en la caractérisation de tels plasmas formés par interaction laser à ultra-haute intensité. Dans le cas d’un plasma d’aluminium, les mesures expérimentales obtenues ont permis de mettre en évidence le caractère complexe de l’interprétation d’un spectre d’émission de couche K habituellement utilisé pour estimer la densité et la température du plasma. Pour restituer les résultats expérimentaux, une suite de simulations numériques utilisant plusieurs codes (codes PIC CALDER, hydro-radiatif MULTI et de physique atomique SPECT3D) a été menée. Ces simulations ont permis de conclure sur la nécessité de prendre en compte de nombreux phénomènes physiques pour caractériser au mieux le plasma : les conditions d’équilibre, la présence d’électrons chauds, l’évolution temporelle rapide et les gradients spatiaux. Ces points sont abordés et discutés dans ce travail. Ces études montrent que ce type d’expériences ouvre de vastes perspectives dans l’étude des plasmas à très haute densité. Une bonne résolution temporelle et spatiale est néanmoins nécessaire pour assurer une caractérisation précise de la densité et de la température du plasma produit.
• Laser-driven platform for generation and characterization of strong quasi-static magnetic fields
  
  • Santos J J
  • Bailly-Grandvaux M
  • Giuffrida L
  • Forestier-Colleoni P
  • Fujioka S
  • Zhang Z
  • Korneev P
  • Bouillaud R
  • Dorard S
  • Batani D
  • Chevrot M
  • Cross J E
  • Crowston R
  • Dubois J-L
  • Gazave J
  • Gregori G
  • D’humières E
  • Hulin S
  • Ishihara K
  • Kojima S
  • Loyez E
  • Marquès J-R
  • Morace A
  • Nicolaï P
  • Peyrusse O
  • Poyé A
  • Raffestin D
  • Ribolzi J
  • Roth M
  • Schaumann G
  • Serres F
  • Tikhonchuk V T
  • Vacar P
  • Woolsey N
  New Journal of Physics, Institute of Physics: Open Access Journals, 2015, 17 (8), pp.083051. Quasi-static magnetic-fields up to 800 T are generated in the interaction of intense laser pulses (500 J, 1 ns, 10(17) W cm(-2)) with capacitor-coil targets of different materials. The reproducible magnetic-field peak and rise-time, consistent with the laser pulse duration, were accurately inferred from measurements with GHz-bandwidth inductor pickup coils (B-dot probes). Results from Faraday rotation of polarized optical laser light and deflectometry of energetic proton beams are consistent with the B-dot probe measurements at the early stages of the target charging, up to t approximate to 0.35 ns, and then are disturbed by radiation and plasma effects. The field has a dipole-like distribution over a characteristic volume of 1 mm(3), which is consistent with theoretical expectations. These results demonstrate a very efficient conversion of the laser energy into magnetic fields, thus establishing a robust laser-driven platform for reproducible, well characterized, generation of quasi-static magnetic fields at the kT-level, as well as for magnetization and accurate probing of high-energy-density samples driven by secondary powerful laser or particle beams. (10.1088/1367-2630/17/8/083051)
  DOI : 10.1088/1367-2630/17/8/083051
• Temporal Narrowing of Neutrons Produced by High-Intensity Short-Pulse Lasers
  
  • Higginson D. p. P
  • Vassura L.
  • Gugiu M. m. M
  • Antici P.
  • Borghesi M.
  • Brauckmann S.
  • Diouf C.
  • Green A.
  • Kar S.
  • Palumbo L.
  • Petrascu H.
  • Sofia S.
  • Stardubtsev M.
  • Willi O.
  • Negoita F.
  • Fuchs J.
  Physical Review Letters, American Physical Society, 2015, 115 (5). (10.1103/PhysRevLett.115.054802)
  DOI : 10.1103/PhysRevLett.115.054802
• Melting and metallization of silica in the cores of gas giants, ice giants, and super Earths
  
  • Mazevet S.
  • Tsuchiya T.
  • Taniuchi T.
  • Benuzzi-Mounaix A.
  • Guyot F.
  Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 92 (1). (10.1103/PhysRevB.92.014105)
  DOI : 10.1103/PhysRevB.92.014105
• Dynamical and transport properties of liquid gallium at high pressures
  
  • Sheppard D.
  • Mazevet S.
  • Cherne F.
  • Albers R.
  • Kadau K.
  • Germann T.
  • Kress J.
  • Collins L.
  Physical Review E : Statistical, Nonlinear, and Soft Matter Physics [2001-2015], American Physical Society, 2015, 91 (6). (10.1103/PhysRevE.91.063101)
  DOI : 10.1103/PhysRevE.91.063101
• Femtosecond Soft X-Ray Laser by Temporal Ionization Gating
  
  • Sebban Stéphane
  • Depresseux A.
  • Gautier Julien
  • Tissandier F.
  • Lifschitz Agustin
  • Ta Phuoc Kim
  • Zeitoun Philippe
  • Oliva Eduardo
  • Maynard G.
  • Nejdl J.
  • Kozlova M.
  • Kim, H. T.
  • Jacquemot Sylvie
  , 2015. (10.1109/PLASMA.2015.7179997)
  DOI : 10.1109/PLASMA.2015.7179997
• Passive coherent combining of CEP-stable few-cycles pulses from a temporally divided hollow fiber compressor (Orale)
  
  • Jacqmin Hermance
  • Jullien Aurélie
  • Mercier Brigitte
  • Hanna Marc
  • Druon Frédéric
  • Papadopoulos Dimitris N.
  • Lopez-Martens Rodrigo B.
  , 2015.
• Time of Flight Measurements for Neutrons Produced in Reactions Driven by Laser-Target Interactions at Petawatt level
  
  • Kisyov S.
  • Negoita F.
  • Gugiu M.M.
  • Higginson D.P.
  • Vassura L.
  • Borghesi M.
  • Bernstein L.
  • Bleuel D.L.
  • Gobet F.
  • Goldblum B.L.
  • Green A.
  • Hannachi F.
  • Kar S.
  • Petrascu H.
  • Pietreanu D.
  • Quentin L.
  • Schroer A.-M.
  • Tarisien M.
  • Versteegen M.
  • Willi O.
  • Antici P.
  • Fuchs J.
  , 2015, 77, pp.Pages 29–33. Short intense pulses of fast neutrons were produced in a two stage laser-driven experiment. Protons were accelerated by means of the Target Normal Sheath Acceleration (TNSA) method using the TITAN facility at the Lawrence Livermore National Laboratory. Neutrons were obtained following interactions of the protons with a secondary lithium fluoride (LiF) target. The properties of the neutron flux were studied using BC-400 plastic scintillation detectors and the neutron time of flight (nTOF) technique. The detector setup and the experimental conditions were simulated with the Geant4 toolkit. The effects of different components of the experimental setup on the nTOF were studied. Preliminary results from a comparison between experimental and simulated nTOF distributions are presented.
• Probing iron at Super-Earth core conditions
  
  • Amadou N.
  • Brambrink E.
  • Vinci T.
  • Benuzzi-Mounaix A.
  • Huser G.
  • Brygoo S.
  • Morard G.
  • Guyot F.
  • de Resseguier T.
  • Mazevet S.
  • Miyanishi K.
  • Ozaki N.
  • Kodama R.
  • Henry O.
  • Raffestin D.
  • Boehly T.
  • Koenig M.
  Physics of Plasmas, American Institute of Physics, 2015, 22 (2), pp.022705. In this paper, we report on the quasi-isentropic compression of an iron sample using ramp shaped laser irradiation. This technique allows us to quasi-isentropically compress iron up to 700 GPa and 8500 K. To our knowledge, these data are the highest pressures reached on iron in off-Hugoniot conditions and the closest to the thermodynamic states thought to exist in Earth-like planetary cores. The experiment was performed on the Ligne d'Intégration laser facility at CESTA, Bordeaux, France. (10.1063/1.4907244)
  DOI : 10.1063/1.4907244
• Passive coherent combining of CEP-stable few-cycles pulses from a temporally divided hollow fiber compressor
  
  • Jacqmin Hermance
  • Jullien Aurélie
  • Mercier Brigitte
  • Hanna Marc
  • Druon Frédéric
  • Papadopoulos Dimitris N.
  • Lopez-Martens Rodrigo B.
  Optics Letters, Optical Society of America - OSA Publishing, 2015, 40 (5), pp.709-712. We demonstrate a simple and robust passive coherent combining technique for temporal compression of millijoule energy laser pulses down to few-cycle duration in a gas-filled hollow fiber. High combining efficiency is achieved by using carefully oriented calcite plates for temporal pulse division and recombination. Carrier-envelope phase (CEP)- stable, 6-fs, 800-nm pulses with more than 0.6 mJ energy are routinely generated. This method could aid in the energy scaling of CEP-stable hollow-fiber compressor systems. (10.1364/OL.40.000673)
  DOI : 10.1364/OL.40.000673
• Design and current progress of the Apollon 10 PW project
  
  • Zou J-P
  • Le Blanc Catherine
  • Papadopoulos Dimitrios
  • Chériaux Gilles
  • Georges Patrick
  • Mennerat G
  • Druon Frédéric
  • Lecherbourg L
  • Pellegrina A
  • Ramirez Patricia
  • Giambruno Fabio
  • Fréneaux Antoine
  • Leconte F
  • Badarau D
  • Boudenne J. M
  • Fournet D
  • Valloton T
  • Paillard Jean-Luc
  • Veray J. L.
  • Pina M
  • Monot P
  • Chambaret Jean Paul
  • Martin Pierre
  • Mathieu F.
  • Audebert P
  • Amiranoff François
  High Power Laser Science and Engineering, Cambridge University Press, 2015, 3 (e2), pp.4 p.. The objective of the Apollon project is the generation of 10 PW peak power pulses of 15 fs at 1 shot/minute. In this paper the Apollon facility design, the technological challenges and the current progress of the project will be presented. (10.1017/hpl.2014.41)
  DOI : 10.1017/hpl.2014.41
• Large size crystalline vs. co-sintered ceramic Yb 3+ :YAG disk performance in diode pumped amplifiers
  
  • Albach Daniel
  • Chanteloup Jean-Christophe
  Optics Express, Optical Society of America - OSA Publishing, 2015, 23 (1), pp.570-579. A comprehensive experimental benchmarking of Yb3+:YAG crystalline and co-sintered ceramic disks of similar thickness and doping level is presented in the context of high average power laser amplifier operation. Comparison is performed considering gain, depolarization and wave front deformation quantitative measurements and analysis. (10.1364/OE.23.000570)
  DOI : 10.1364/OE.23.000570
• Analysis of X-ray and Thomson scattering data from non-LTE Nb and Ta plasmas
  
  • Bastiani-Ceccotti S.
  • Bourgaux A. C.
  • Bowen C.
  • Dorchies F.
  • Gilleron F.
  • Marques J. R.
  • Pain J. C.
  • Silvert V.
  • Vinci T.
  High Energy Density Physics, Elsevier, 2015, 16, pp.41-52. no abstract
• Polarization analysis of CuXX-lines emitted from X-pinch
  
  • Baronova E O
  • Larour Jean
  • Rosmej F B
  • Khattak F y
  Journal of Physics: Conference Series, IOP Science, 2015, 653, pp.012145. Soft x-ray emission from CuXX L-shell lines emitted by a dense X-pinch plasma have been investigated with high-resolution curved Bragg crystals at different angles of orientation. Single shot time integrated spectra show clear evidences of polarization for the Ne-like spectral lines 2s22p6 1S0 → 2s22p53s 1P1 (λ = 12.570 Å), 2s22p6 1S0 → 2s22p53s 3P1 (λ = 12.8277 Å). The variation of the intensity ratio of these two well-separated L-shell lines is discussed in view of its application for suprathermal electron characterization under real experimental conditions of pinch plasmas. We demonstrated that the simultaneous use of two different polarization spectrometers (means 4 Bragg crystals) permitted a high level of confidence for the analysis of the variation of the line ratios due to polarization. (10.1088/1742-6596/653/1/012145)
  DOI : 10.1088/1742-6596/653/1/012145