All Publications

  • Role of relativistic laser intensity on isochoric heating of metal wire targets OPTICS EXPRESS Martynenko, A. S., Pikuz, S. A., Antonelli, L., Barbato, F., Boutoux, G., Giuffrida, L., Honrubia, J. J., Hume, E., Jacoby, J., Khaghani, D., Lancaster, K., Neumayer, P., Rosmej, O. N., Santos, J. J., Turianska, O., Batani, D. 2021; 29 (8): 12240-12251


    In a recent experimental campaign, we used laser-accelerated relativistic hot electrons to ensure heating of thin titanium wire targets up to a warm dense matter (WDM) state [EPL114, 45002 (2016)10.1209/0295-5075/114/45002]. The WDM temperature profiles along several hundred microns of the wire were inferred by using spatially resolved X-ray emission spectroscopy looking at the Ti Kα characteristic lines. A maximum temperature of ∼30 eV was reached. Our study extends this work by discussing the influence of the laser parameters on temperature profiles and the optimisation of WDM wire-based generation. The depth of wire heating may reach several hundreds of microns and it is proven to be strictly dependent on the laser intensity. At the same time, it is quantitatively demonstrated that the maximum WDM temperature doesn't appear to be sensitive to the laser intensity and mainly depends on the deposited laser energy considering ranges of 6×1018-6×1020 W/cm2 and 50-200 J.

    View details for DOI 10.1364/OE.415091

    View details for Web of Science ID 000640033600072

    View details for PubMedID 33984988

  • X-ray spectroscopy evidence for plasma shell formation in experiments modeling accretion columns in young stars MATTER AND RADIATION AT EXTREMES Filippov, E. D., Skobelev, I., Revet, G., Chen, S. N., Khiar, B., Ciardi, A., Khaghani, D., Higginson, D. P., Pikuz, S. A., Fuchs, J. 2019; 4 (6)

    View details for DOI 10.1063/1.5124350

    View details for Web of Science ID 000512299700005

  • Properties of laser-driven hard x-ray sources over a wide range of laser intensities PHYSICS OF PLASMAS Borm, B., Khaghani, D., Neumayer, P. 2019; 26 (2)

    View details for DOI 10.1063/1.5081800

    View details for Web of Science ID 000460094400059

  • Generation of keV hot near-solid density plasma states at high contrast laser-matter interaction PHYSICS OF PLASMAS Rosmej, O. N., Samsonova, Z., Hoefer, S., Kartashov, D., Arda, C., Khaghani, D., Schoenlein, A., Zaehter, S., Hoffmann, A., Loetzsch, R., Saevert, A., Uschmann, I., Povarnitsyn, M. E., Andreev, N. E., Pugachev, L. P., Kaluza, M. C., Spielmann, C. 2018; 25 (8)

    View details for DOI 10.1063/1.5027463

    View details for Web of Science ID 000443730900081

  • Enhancement of Quasistationary Shocks and Heating via Temporal Staging in a Magnetized Laser-Plasma Jet PHYSICAL REVIEW LETTERS Higginson, D. P., Khiar, B., Revet, G., Beard, J., Blecher, M., Borghesi, M., Burdonov, K., Chen, S. N., Filippov, E., Khaghani, D., Naughton, K., Pepin, H., Pikuz, S., Portugall, O., Riconda, C., Riquier, R., Rodriguez, R., Ryazantsev, S. N., Skobelev, I., Soloviev, A., Starodubtsev, M., Vinci, T., Willi, O., Ciardi, A., Fuchs, J. 2017; 119 (25): 255002


    We investigate the formation of a laser-produced magnetized jet under conditions of a varying mass ejection rate and a varying divergence of the ejected plasma flow. This is done by irradiating a solid target placed in a 20 T magnetic field with, first, a collinear precursor laser pulse (10^{12}  W/cm^{2}) and, then, a main pulse (10^{13}  W/cm^{2}) arriving 9-19 ns later. Varying the time delay between the two pulses is found to control the divergence of the expanding plasma, which is shown to increase the strength of and heating in the conical shock that is responsible for jet collimation. These results show that plasma collimation due to shocks against a strong magnetic field can lead to stable, astrophysically relevant jets that are sustained over time scales 100 times the laser pulse duration (i.e., >70  ns), even in the case of strong variability at the source.

    View details for DOI 10.1103/PhysRevLett.119.255002

    View details for Web of Science ID 000418619100008

    View details for PubMedID 29303310

  • Laboratory unraveling of matter accretion in young stars SCIENCE ADVANCES Revet, G., Chen, S. N., Bonito, R., Khiar, B., Filippov, E., Argiroffi, C., Higginson, D. P., Orlando, S., Beard, J., Blecher, M., Borghesi, M., Burdonov, K., Khaghani, D., Naughton, K., Pepin, H., Portugall, O., Riquier, R., Rodriguez, R., Ryazantsev, S. N., Skobelev, I., Soloviev, A., Willi, O., Pikuz, S., Ciardi, A., Fuchs, J. 2017; 3 (11): e1700982


    Accretion dynamics in the formation of young stars is still a matter of debate because of limitations in observations and modeling. Through scaled laboratory experiments of collimated plasma accretion onto a solid in the presence of a magnetic field, we open a first window on this phenomenon by tracking, with spatial and temporal resolution, the dynamics of the system and simultaneously measuring multiband emissions. We observe in these experiments that matter, upon impact, is ejected laterally from the solid surface and then refocused by the magnetic field toward the incoming stream. This ejected matter forms a plasma shell that envelops the shocked core, reducing escaped x-ray emission. This finding demonstrates one possible structure reconciling current discrepancies between mass accretion rates derived from x-ray and optical observations, respectively.

    View details for DOI 10.1126/sciadv.1700982

    View details for Web of Science ID 000418002000015

    View details for PubMedID 29109974

    View details for PubMedCentralID PMC5665592

  • Enhancing laser-driven proton acceleration by using micro-pillar arrays at high drive energy SCIENTIFIC REPORTS Khaghani, D., Lobet, M., Borm, B., Burr, L., Gaertner, F., Gremillet, L., Movsesyan, L., Rosmej, O., Toimil-Molares, M., Wagner, F., Neumayer, P. 2017; 7: 11366


    The interaction of micro- and nano-structured target surfaces with high-power laser pulses is being widely investigated for its unprecedented absorption efficiency. We have developed vertically aligned metallic micro-pillar arrays for laser-driven proton acceleration experiments. We demonstrate that such targets help strengthen interaction mechanisms when irradiated with high-energy-class laser pulses of intensities ~1017-18 W/cm2. In comparison with standard planar targets, we witness strongly enhanced hot-electron production and proton acceleration both in terms of maximum energies and particle numbers. Supporting our experimental results, two-dimensional particle-in-cell simulations show an increase in laser energy conversion into hot electrons, leading to stronger acceleration fields. This opens a window of opportunity for further improvements of laser-driven ion acceleration systems.

    View details for DOI 10.1038/s41598-017-11589-z

    View details for Web of Science ID 000410297900080

    View details for PubMedID 28900164

    View details for PubMedCentralID PMC5596005

  • Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle HIGH ENERGY DENSITY PHYSICS Higginson, D. P., Revet, G., Khiar, B., Beard, J., Blecher, M., Borghesi, M., Burdonov, K., Chen, S. N., Filippov, E., Khaghani, D., Naughton, K., Pepin, H., Pikuz, S., Portugall, O., Riconda, C., Riquier, R., Ryazantsev, S. N., Skobelev, I., Soloviev, A., Starodubtsev, M., Vinci, T., Willi, O., Ciardi, A., Fuchs, J. 2017; 23: 48-59
  • X-Ray Emission Generated By Laser-Produced Plasmas From Dielectric Nanostructured Targets Samsonova, Z., Hoefer, S., Hoffmann, A., Landgraf, B., Zuerch, M., Uschmann, I., Khaghani, D., Rosmej, O., Neumayer, P., Roeder, R., Trefflich, L., Ronning, C., Foerster, E., Spielmann, C., Kartashov, D., Benredjem, D. AMER INST PHYSICS. 2017

    View details for DOI 10.1063/1.4975743

    View details for Web of Science ID 000404402600032

  • X-Ray Emission of Exotic Ions in Dense Plasmas Rosmej, F. B., Khaghani, D., Dozieres, M., Dachicourt, R., Smid, M., Renner, O., Benredjem, D. AMER INST PHYSICS. 2017

    View details for DOI 10.1063/1.4975755

    View details for Web of Science ID 000404402600044

  • Improvement of density resolution in short-pulse hard x-ray radiographic imaging using detector stacks REVIEW OF SCIENTIFIC INSTRUMENTS Borm, B., Gaertner, F., Khaghani, D., Neumayer, P. 2016; 87 (9): 093104


    We demonstrate that stacking several imaging plates (IPs) constitutes an easy method to increase hard x-ray detection efficiency. Used to record x-ray radiographic images produced by an intense-laser driven hard x-ray backlighter source, the IP stacks resulted in a significant improvement of the radiograph density resolution. We attribute this to the higher quantum efficiency of the combined detectors, leading to a reduced photon noise. Electron-photon transport simulations of the interaction processes in the detector reproduce the observed contrast improvement. Increasing the detection efficiency to enhance radiographic imaging capabilities is equally effective as increasing the x-ray source yield, e.g., by a larger drive laser energy.

    View details for DOI 10.1063/1.4961666

    View details for Web of Science ID 000385634500005

    View details for PubMedID 27782594

  • Generation and characterization of warm dense matter isochorically heated by laser-induced relativistic electrons in a wire target EPL Schoenlein, A., Boutoux, G., Pikuz, S., Antonelli, L., Batani, D., Debayle, A., Franz, A., Giuffrida, L., Honrubia, J. J., Jacoby, J., Khaghani, D., Neumayer, P., Rosmej, O. N., Sakaki, T., Santos, J. J., Sauteray, A. 2016; 114 (4)
  • K-shell spectroscopic diagnosis of suprathermal electrons at fusion-relevant environmental conditions Renner, O., Smid, M., Khaghani, D., Rosmej, F. B., IOP IOP PUBLISHING LTD. 2016
  • Parameters of supersonic astrophysically-relevant plasma jets collimating via poloidal magnetic field measured by x-ray spectroscopy method Filippov, E. D., Pikuz, S. A., Skobelev, I., Ryazantsev, S. N., Higginson, D. P., Khaghani, D., Revet, G., Chen, S. N., Fuchs, J., IOP IOP PUBLISHING LTD. 2016
  • X-ray opacity measurements in mid-Z dense plasmas with a new target design of indirect heating HIGH ENERGY DENSITY PHYSICS Dozieres, M., Thais, F., Bastiani-Ceccotti, S., Blenski, T., Fariaut, J., Foelsner, W., Gilleron, F., Khaghani, D., Pain, J., Reverdin, C., Rosmej, F., Silvert, V., Soullie, G., Villette, B. 2015; 17: 231-239
  • Exotic x-ray emission from dense plasmas JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS Rosmej, F. B., Dachicourt, R., Deschaud, B., Khaghani, D., Dozieres, M., Smid, M., Renner, O. 2015; 48 (22)
  • Electron-ion temperature equilibration in warm dense tantalum HIGH ENERGY DENSITY PHYSICS Hartley, N. J., Belancourt, P., Chapman, D. A., Doeppner, T., Drake, R. P., Gericke, D. O., Glenzer, S. H., Khaghani, D., Lepape, S., Ma, T., Neumayer, P., Pak, A., Peters, L., Richardson, S., Vorberger, J., WHITE, T. G., Gregori, G. 2015; 14: 1-5
  • Developments toward hard X-ray radiography on heavy-ion heated dense plasmas LASER AND PARTICLE BEAMS Li, K., Borm, B., Hug, F., Khaghani, D., Loether, B., Savran, D., Tahir, N. A., Neumayer, P. 2014; 32 (4): 631-637
  • Investigation of x-ray emission induced by hot electrons in dense Cu plasmas Smid, M., Renner, O., Rosmej, F. B., Khaghani, D. IOP PUBLISHING LTD. 2014