The role of hot electron refluxing in laser-generated K-alpha sources

Neumayer, P.; Aurand, B.; Basko, M.; Ecker, B.; Gibbon, P.; Hochhaus, D. C.; Karmakar, A.; Kazakov, E.; Kühl, T.; Labaune, C.; Rosmej, O.; Tauschwitz, An.; Zielbauer, B.; Zimmer, D.
October 2010
Physics of Plasmas;Oct2010, Vol. 17 Issue 10, p103103
Academic Journal
A study of the contribution of refluxing electrons in the production of K-alpha radiation from high-intensity laser irradiated thin targets has been performed. Thin copper foils both freestanding, and backed by a thick substrate were irradiated with laser pulses of energies around 100 J at intensities ranging from below 1017 to above 1019 W/cm2. At high laser intensities we find a strong reduction in the K-alpha yield from targets backed by the substrate. The observed yield reduction is in good agreement with a simple model using hot electron spectra from particle-in-cell simulations or directly inferred from the measured bremsstrahlung emission and can therefore be interpreted as due to the suppression of hot electron refluxing. The study shows that refluxing electrons play a dominant role in high-intensity laser driven K- alpha generation and have to be taken into account in designing targets for laser driven high-flux K-alpha sources.


Related Articles

  • Spectral analysis of x-ray emission created by intense laser irradiation of copper materials. Huntington, C. M.; Kuranz, C. C.; Malamud, G.; Drake, R. P.; Park, H.-S.; Maddox, B. R. // Review of Scientific Instruments;Oct2012, Vol. 83 Issue 10, p10E114 

    We have measured the x-ray emission, primarily from Kα,Kβ, and Heα lines, of elemental copper foil and 'foam' targets irradiated with a mid-1016 W/cm2 laser pulse. The copper foam at 0.1 times solid density is observed to produce 50% greater Heα line emission than copper foil, and...

  • Validation of magnetophonon spectroscopy as a tool for analyzing hot-electron effects in devices. Barker, J. R.; Mudares, M.; Snell, B. R.; Guimaraes, P. S. S.; Taylor, D. C.; Eaves, L.; Hill, G. // Applied Physics Letters;8/15/1985, Vol. 47 Issue 4, p387 

    It is shown that very high precision hot-electron magnetophonon experiments made on n[sup +] n[sup -] n[sup +]GaAs sandwich device structures which are customized for magnetoresistance measurements can be very accurately modeled by a new Monte Carlo technique. The latter takes account of the...

  • Effect of external magnetic field on the generation and transport of hot electrons in laser-target irradiation. Enright, G. D.; Burnett, N. H. // Physics of Fluids (00319171);Oct86, Vol. 29 Issue 10, p3456 

    The effect of an externally applied magnetic field on the generation and transport of hot electrons in CO[sub 2] laser irradiation of cylindrical targets has been investigated. It is observed that an external magnetic field of 100 kG increases the energy coupled into the target by superhot ( >...

  • Destruction of a MgF2 optical coating by 250 keV α particle irradiation. Mendenhall, Marcus H.; Weller, Robert A. // Applied Physics Letters;10/22/1990, Vol. 57 Issue 17, p1712 

    Magnesium fluoride coatings ∼170 Å thick have been evaporated onto mirror-quality Be substrates in ultrahigh vacuum and subsequently subjected to 250 keV α particle irradiation at room temperature. Analysis of the irradiated area by medium energy backscattering spectrometry revealed...

  • On the character of the destruction of a copper foil by intense x-ray irradiation. Golubev, V. K.; Rabinovich, K. G.; Chernyshev, A. K. // Technical Physics;Feb98, Vol. 43 Issue 2, p241 

    The character of the destruction of copper foil by x-rays produced by a nuclear explosion is investigated. Results on the removal of material from the front surface and on spallation fracture are obtained. The latter results are compared with those obtained under different loading conditions....

  • Collimated hot electron jets generated from subwavelength grating targets irradiated by intense short-pulse laser. Guang-yue Hu; An-le Lei; Wen-tao Wang; Xin Wang; Lin-gen Huang; Jing-wei Wang; Yi Xu; Jian-sheng Liu; Wei Yu; Bai-fei Shen; Ru-xin Li; Zhi-zhan Xu // Physics of Plasmas;Mar2010, Vol. 17 Issue 3, p033109 

    Hot electron emission from subwavelength grating targets irradiated by a 60 fs short-pulse laser was investigated at moderate intensities in excess of 1015 W/cm2. Collimated hot electron jets with a divergence angle as small as 5° were observed at the specular reflection direction when the...

  • Enhanced absorption of intense short-pulse laser light by subwavelength nanolayered target. Lihua Cao; Yuqiu Gu; Zongqing Zhao; Leifeng Cao; Wenzhong Huang; Weimin Zhou; He, X. T.; Wei Yu; Yu, M. Y. // Physics of Plasmas;Apr2010, Vol. 17 Issue 4, p043103 

    Two-dimensional particle-in-cell simulation shows that a target with subwavelength nanolayered front can reduce the reflection and increase the absorption of the energy of an intense short laser pulse. The electrons within the skin depth on the surfaces of the nanolayers are accelerated by...

  • Energy enhancement of quasi-monoenergetic proton bunches using a slice-cone target. Zheng, Jun; Sheng, Zheng-Ming; Liu, Jin-Lu; Zhou, Wei-Min; Xu, Han; Zhang, Jie // Physics of Plasmas;Nov2011, Vol. 18 Issue 11, p113103 

    A slice-cone target is proposed for the generation of quasi-monoenergetic proton bunches. In this new target structure, two symmetrical solid slices are adjoined obliquely to the tip of a hollow cone. Two-dimensional particle-in-cell simulations show that a large number of hot electrons are...

  • Dynamics and structure of self-generated magnetics fields on solids following high contrast, high intensity laser irradiation. Albertazzi, B.; Chen, S. N.; Antici, P.; Böker, J.; Borghesi, M.; Breil, J.; Dervieux, V.; Feugeas, J. L.; Lancia, L.; Nakatsutsumi, M.; Nicolaï, Ph.; Romagnagni, L.; Shepherd, R.; Sentoku, Y.; Starodubtsev, M.; Swantusch, M.; Tikhonchuk, V. T.; Willi, O.; d'Humières, E.; Pépin, H. // Physics of Plasmas;Dec2015, Vol. 22 Issue 12, p1 

    The dynamics of self-generated magnetic B-fields produced following the interaction of a high contrast, high intensity (I>1019W cm-2) laser beam with thin (3 μm thick) solid (Al or Au) targets is investigated experimentally and numerically. Two main sources drive the growth of B-fields on the...


Read the Article


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

Try another library?
Sign out of this library

Other Topics