X-ray conversion with PHEBUS laser

Babonneau, D.; Bonnet, L.; Jacquemot, S.; Bocher, J. L.; Boutin, Jean-Yves; Jadaud, J. P.; Vilette, B.

doi:10.1017/s0263034699173130

Cited by 5 publications

(2 citation statements)

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“…With long pulse laser beams, the measurements of the conversion efficiency of multi-keV X-ray sources were focused on the K-and M-shell emission in the past (Kauffman, 1991;Babonneau, 1999). Multi-keV L-shell X-ray sources produced with long pulse laser irradiated solid targets have been used frequently as heating or backlighting sources (Pikuz et al, 2002;Glenzer et al, 2003;Riley et al, 2007;Schollmeier et al, 2006;Riley et al, 2002a;Glendinning et al, 1995;Scott et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Angular distribution and conversion of multi-keV L-shell X-ray sources produced from nanosecond laser irradiated thick-foil targets

Zhang

Zheng

et al. 2008

Laser Part. Beams

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An experimental study on the angular distribution and conversion of multi-keV X-ray sources produced from 2 ns-duration 527nm laser irradiated thick-foil targets on Shenguang II laser facility (SG-II) is reported. The angular distributions measured in front of the targets can be fitted with the function of f(u) ¼ aþ (12a)cos b u (u is the viewing angle relative to the target normal), where a ¼ 0.41 + 0.014, b ¼ 0.77 + 0.04 for Ti K-shell X-ray sources (4.75 keV for Ti K-shell), and a ¼ 0.085 + 0.06, b ¼ 0.59 + 0.07 for Ag/Pd/Mo L-shell X-ray sources (2-2.8 keV for Mo L-shell, 2.8-3.5 keV for Pd L-shell, and 3-3.8 keV for Ag L-shell). The isotropy of the angular distribution of L-shell emission is worse than that of the K-shell emission at larger viewing angle (.708), due to its larger optical depth (stronger self-absorption) in the cold plasma side lobe surrounding the central emission region, and in the central hot plasma region (emission region). There is no observable difference in the angular distributions of the L-shell X-ray emission among Ag, Pd, and Mo. The conversion efficiency of Ag/Pd/Mo L-shell X-ray sources is higher than that of the Ti K-shell X-ray sources, but the gain relative to the K-shell emission is not as high as that by using short pulse lasers. The conversion efficiency of the L-shell X-ray sources decreases with increasing atomic numbers (or X-ray photon energy), similar to the behavior of the K-shell X-ray source.

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Section: Introductionmentioning

confidence: 99%

Angular distribution and conversion of multi-keV L-shell X-ray sources produced from nanosecond laser irradiated thick-foil targets

Zhang

Zheng

et al. 2008

Laser Part. Beams

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“…Numerous experiments [1][2][3][4][5] have been performed to measure the X-ray flux on various laser interaction schemes in the range from 0.1 keV to 4 keV representing the main contribution to the X-ray emission.…”

Section: Introductionmentioning

confidence: 99%

Absolute radiant power measurement for the Au M lines of laser-plasma using a calibrated broadband soft X-ray spectrometer with flat-spectral response

Troussel

Villette

Emprin

et al. 2014

Review of Scientific Instruments

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CEA implemented an absolutely calibrated broadband soft X-ray spectrometer called DMX on the Omega laser facility at the Laboratory for Laser Energetics (LLE) in 1999 to measure radiant power and spectral distribution of the radiation of the Au plasma. The DMX spectrometer is composed of 20 channels covering the spectral range from 50 eV to 20 keV. The channels for energies below 1.5 keV combine a mirror and a filter with a coaxial photo-emissive detector. For the channels above 5 keV the photoemissive detector is replaced by a conductive detector. The intermediate energy channels (1.5 keV < photon energy < 5 keV) use only a filter and a coaxial detector. A further improvement of DMX consists in flat-response X-ray channels for a precise absolute measurement of the photon flux in the photon energy range from 0.1 keV to 6 keV. Such channels are equipped with a filter, a Multilayer Mirror (MLM), and a coaxial detector. We present as an example the development of channel for the gold M emission lines in the photon energy range from 2 keV to 4 keV which has been successfully used on the OMEGA laser facility. The results of the radiant power measurements with the new MLM channel and with the usual channel composed of a thin titanium filter and a coaxial detector (without mirror) are compared. All elements of the channel have been calibrated in the laboratory of the Physikalisch-Technische Bundesanstalt, Germany's National Metrology Institute, at the synchrotron radiation facility BESSY II in Berlin using dedicated well established and validated methods.

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Effects of self-generated magnetic fields and nonlocal electron transport in laser produced plasmas

et al. 2000

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Experiments using planar gold targets were performed at the Phebus facility [G. Thiell, Laser Part. Beams 16, 253 (1998)] in order to characterize the deposition of laser energy. These experiments have been simulated with a two-dimensional radiation-hydrodynamic code. Using flux limited Spitzer–Härm transport [L. Spitzer and R. Härm, Phys. Rev. 89, 977 (1953)], no agreement was obtained between simulations and experiments. Soft x-ray streak camera and two-dimensional time-resolved radiography data cannot be reproduced. For the first time, self-generated magnetic fields and nonlocal heat fluxes have been taken into account in a two-dimensional code. Both effects are simultaneously computed. The artificially limited Spitzer–Härm fluxes are not needed anymore with this treatment of the heat conduction. The simulations obtained with the latter are in good agreement with all the experimental results. Based on the numerical results, effects of the magnetic fields and nonlocal fluxes on electron temperature and x-ray conversion of the plasma are also presented.

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X-ray conversion with PHEBUS laser

Cited by 5 publications

References 0 publications

Angular distribution and conversion of multi-keV L-shell X-ray sources produced from nanosecond laser irradiated thick-foil targets

Angular distribution and conversion of multi-keV L-shell X-ray sources produced from nanosecond laser irradiated thick-foil targets

Absolute radiant power measurement for the Au M lines of laser-plasma using a calibrated broadband soft X-ray spectrometer with flat-spectral response

Effects of self-generated magnetic fields and nonlocal electron transport in laser produced plasmas

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