Study of silver Kα and bremsstrahlung radiation from short-pulse laser-matter interactions with applications for x-ray radiography

Westover, B.; MacPhee, A.; Chen, C.; Hey, D.; Ma, T.; Maddox, B.; Park, H.-S.; Remington, B.; Beg, F. N.
August 2010
Physics of Plasmas;Aug2010, Vol. 17 Issue 8, p082703
Academic Journal
Measurements of Kα radiation yield and x-ray bremsstrahlung emission from thin-foil silver targets are presented. The targets were irradiated by a short pulse laser with intensities from 5×1016 to 1018 W/cm2 at 40 ps. Single hit charge-coupled device detectors, differential filter-stack detectors, and a crystal spectrometer were used to investigate the angular distribution of the Kα and bremsstrahlung x-rays. This study is the first to use a broadband detector to estimate the absolute numbers of Kα photons and to determine Kα to bremsstrahlung ratios. The relevance of this work in the context of x-ray diffraction and x-ray radiography is discussed.


Related Articles

  • Anomalous fluorescence line intensity in megavoltage bremsstrahlung. Litz, M. S.; Merkel, G.; Pereira, N. R.; Boyer, C. N.; Holland, G. E.; Schumer, J. W.; Seely, J. F.; Hudson, L. T.; Carroll, J. J. // Physics of Plasmas;Apr2010, Vol. 17 Issue 4, p043302 

    An anomalous ratio between Kα and Kβ fluorescence interpreted with plasma radiation modeling can be a useful diagnostic in laser-produced plasmas. In cold tungsten there exists a similar but as yet undocumented anomaly: for 2 MeV end point bremsstrahlung in the forward direction...

  • Laser triggered single streamer in a pin-to-pin coplanar dielectric barrier discharge. Ambrico, P. F.; Ambrico, M.; Sˇimek, M.; Colaianni, A.; Dilecce, G.; De Benedictis, S. // Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p231501 

    The effect of laser light interaction with alumina surface of a single filament coplanar dielectric barrier discharge has been investigated. It has been found that for laser photon energy lower than the pure alumina photoelectron emission threshold, the laser beam was effective in triggering...

  • Inverse bremsstrahlung stabilization of noise in the generation of ultrashort intense pulses by backward Raman amplification. Berger, Richard L.; Clark, Daniel S.; Solodov, Andrei A.; Valeo, Ernest J.; Fisch, Nathaniel J. // Physics of Plasmas;May2004, Vol. 11 Issue 5, p1931 

    Inverse bremsstrahlung absorption of the pump laser beam in a backward Raman amplifier over the round-trip light transit time through the subcritical density plasma can more than double the electron temperature of the plasma and produce time-varying axial temperature gradients. The resulting...

  • Effect of background gas pressure and laser pulse intensity on laser induced plasma radiation of copper samples. Mehrabian, S.; Aghaei, M.; Tavassoli, S. H. // Physics of Plasmas;Apr2010, Vol. 17 Issue 4, p043301 

    Study of laser induced plasma emission of Cu in one dimension is numerically carried out. Effects of different background gas pressure (He), 100, 500, and 760 torr, and laser pulse intensities, 0.5, 0.7, and 1 GW/cm2, on the plasma emission as well as ablation processes are investigated. Under a...

  • Bremsstrahlung target optimization for reflex triodes. Swanekamp, S. B.; Weber, B. V.; Stephanakis, S. J.; Mosher, D.; Commisso, R. J. // Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p083105 

    The anode (tantalum) foil thickness in a reflex triode was varied from 2.5 to 250 μm to maximize the dose from bremsstrahlung produced by a 1 MV, 1 MA, 100 ns electron beam. Experiments and computer simulations show that the dose is maximized for a foil thickness of about 25 μm, 1/18th of...

  • Temperature sensitivity of Cu Kα imaging efficiency using a spherical Bragg reflecting crystal. Akli, K. U.; Key, M. H.; Chung, H. K.; Hansen, S. B.; Freeman, R. R.; Chen, M. H.; Gregori, G.; Hatchett, S.; Hey, D.; Izumi, N.; King, J.; Kuba, J.; Norreys, P.; Mackinnon, A. J.; Murphy, C. D.; Snavely, R.; Stephens, R. B.; Stoeckel, C.; Theobald, W.; Zhang, B. // Physics of Plasmas;Feb2007, Vol. 14 Issue 2, p022104 

    The interaction of a 75 J 10 ps, high intensity laser beam with low-mass, solid Cu targets is investigated. Two instruments were fielded as diagnostics of Cu K-shell emission from the targets: a single photon counting spectrometer provided the absolute Kα yield [C. Stoeckl et al., Rev. Sci....

  • Z[sub eff] spatial profiles from Bremsstrahlung emission in the near infrared spectral region. Orsitto, F.; Belforte, M.R.; Brusadin, A.; Giovannozzi, E.; Pacella, D.; May, M.J. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p925 

    Performs measurements of plasma radiation in the Bremsstrahlung emission in the infrared range (BREM-IR) at 16 horizontal lines of sight intersecting the central vertical chord of the Frascati Tokamak Upgrade (FTU). System description and FTU discharge parameters; Measured BREM-IR intensity;...

  • Hot electron measurements in ignition relevant Hohlraums on the National Ignition Facility. Dewald, E. L.; Thomas, C.; Hunter, S.; Divol, L.; Meezan, N.; Glenzer, S. H.; Suter, L. J.; Bond, E.; Kline, J. L.; Celeste, J.; Bradley, D.; Bell, P.; Kauffman, R. L.; Kilkenny, J.; Landen, O. L. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D938 

    On the National Ignition Facility (NIF), hot electrons generated in laser heated Hohlraums are inferred from the >20 keV bremsstrahlung emission measured with the time integrated FFLEX broadband spectrometer. New high energy (>200 keV) time resolved channels were added to infer the generated...

  • Temperature diagnostics of ECR plasma by measurement of electron bremsstrahlung. Kasthurirangan, S.; Agnihotri, A. N.; Desai, C. A.; Tribedi, L. C. // Review of Scientific Instruments;Jul2012, Vol. 83 Issue 7, p073111 

    The x-ray bremsstrahlung spectrum emitted by the electron population in a 14.5 GHz ECR plasma source has been measured using a NaI(Tl) detector, and hence the electron temperature of the higher energy electron population in the plasma has been determined. The x-ray spectra for Ne and Ar gases...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics