量子科学技術研究開発機構学術機関リポジトリ

Efficient generation of ~MeV x-rays in the Gamma Flare regime [1],[2] in
preplasma via the nonlinear Thomson/inverse Compton scattering mechanism
[3] is one of the most promising and expected high-power laser
applications. The hard x-rays are generated by Bremsstrahlung as well,
while the electrons go through the target [4],[5], which also includes
multiple passes (refluxing) [5],[6]. Simulations predict that at high
intensities the preplasma x-rays dominate; however, at intensities
available now, Bremsstrahlung dominates, so that the Gamma Flare
mechanism is not yet demonstrated experimentally.
We describe our experiment performed with the J-KAREN-P laser [7]-[9],
with the emphasis on data from the scintillator-based hard x-ray
spectrographs [10] (0.1 – 1 MeV) and Compton spectrograph [11] (2 – 10
MeV), and our efforts to distinguish the generation mechanism.
We thank the J-KAREN-P laser operation group. We acknowledge financial
support from ELI-Beamlines, JSPS JP 19H00669, and QST Director Funds 創
成的研究 16 and 創成的研究 20.
[1] T. Nakamura, et al., "High-Power γ-Ray Flash Generation in
Ultraintense Laser-Plasma Interactions," Phys. Rev. Lett. 108, 195001 (
2012).
[2] C. P. Ridgers, et al., "Dense Electron-Positron Plasmas and
Ultraintense γ rays from Laser-Irradiated Solids," Phys. Rev. Lett. 108,
165006 (2012).
[3] K. V. Lezhnin, P. V. Sasorov, G. Korn, and S. V. Bulanov, "High
power gamma flare generation in multi-petawatt laser interaction with
tailored targets," Phys. Plasmas 25, 123105 (2018).
[4] D. Wu, et al., "Characteristics of X/γ-ray radiations by intense
laser interactions with high-Z solids: The role of bremsstrahlung and
radiation reactions," Matter Rad. Extremes 3, 293-299 (2018).
[5] J. Vyskočil, O. Klimo, S. Weber, "Simulations of bremsstrahlung
emission in ultra-intense laser interactions with foil targets," Plasma
Phys. Control. Fusion 60, 054013 (2018).
[6] D. R. Rusby, et al., "Effect of rear surface fields on hot,
refluxing and escaping electron populations via numerical simulations,"
High Pow. Las. Sci. Eng. 7, e45 (2019).
[7] A.S.Pirozhkov, et al., "Approaching the diffraction-limited,
bandwidth-limited Petawatt," Opt. Express 25, 20486 (2017).
[8] H. Kiriyama, et al., "High-contrast high-intensity repetitive
petawatt laser," Opt. Lett. 43, 2595 (2018).
[9] H. Kiriyama, et al., "Experimental investigation on temporal
contrast of pre-pulses by post-pulses in a petawatt laser facility," Opt.
Lett. (accepted).
[10] D. R. Rusby, et al., "Novel scintillator-based x-ray spectrometer
for use on high repetition laser plasma interaction experiments," Rev.
Sci. Instr. 89, 073502 (2018).
[11] S. Singh, et al., "Compact high energy x-ray spectrometer based on
forward Compton scattering for high intensity laser plasma experiments,"
Rev. Sci. Instr. 89, 085118 (2018).

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OPTICS & PHOTONICS International Congress 2020

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2020-04-23

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Hard x-ray generation at intensity approaching 10^22 W/cm^2

× Pirozhkov, Alexander

× Ogura, Koichi

× Armstrong, C.

× Neely, D.

× Timur, Esirkepov

× Sagisaka, Akito

× Hayakawa, Takehito

× Yan, W.

× M. Jeong, T.

× Singh, S.

× Hadjisolomou, P.

× Finke, O.

× Kumar, D.

× Grittani, G.

× Nevrkla, M.

× Lazzarini, C.

× Nejdl, J.

× Velyhan, A.

× N. Shatokhin, A.

× A. Vishnyakov, E.

× O. Kolesnikov, A.

× N. Ragozin, E.

× A. Pikuz, T.

× A. Alkhimova, M.

× A. Pikuz, S.

× Gonzalez izquierdo, Bruno

× Fukuda, Yuuji

× Kevin Koga, James

× Ishino, Masahiko

× Kondo, Kotaro

× Miyasaka, Yasuhiro

× Kon, Akira

× Nishikino, Masaharu

× Margarone, D.

× Sasorov, P.

× Weber, S.

× Kando, Masaki

× Kiriyama, Hiromitsu

× Korn, G.

× Kondo, Kiminori

× Bulanov, Sergey

× Kawachi, Tetsuya