Experimental capabilities of the LMJ-PETAL facility

Cayzac, W.; Boutoux, G.; Brygoo, S.; Denoeud, A.; Depierreux, S.; Tassin, V.; Albert, F.; Alozy, E.; Baccou, C.; Batani, D.; Blanchot, N.; Bonneau, M.; Bonnefille, M.; Botrel, R.; Bowen, C.; Bradford, P.; Brochier, M.; Caillaud, T.; Chaleil, A.; Chardavoine, S.; Chollet, C.; Courtois, C.; Darbon, S.; Davoine, X.; Debesset, S.; Denis, V.; Diaz, R.; Dizière, A.; Du Jeu, R.; Duchastenier, W.; Dupré, P.; Duval, A.; Esnault, C.; Etchessahar, B.; Ferri, M.; Fuchs, J.; Geoffray, I.; Gremillet, L.; Grolleau, A.; D’Humières, E.; Jalinaud, T.; Laffite, S.; Lafon, M.; Lagache, M.A.; Landoas, O.; Lantuejoul, I.; Le-Deroff, L.; Le Tacon, S.; Leidinger, J.P.; Lelièvre, R.; Liberatore, S.; Mahieu, B.; Masson-Laborde, P.E.; Meyer, C.; Miquel, J.L.; Parreault, R.; Philippe, F.; Prévot, V.; Prunet, P.; Raphaël, O.; Reverdin, C.; Ribotte, L.; Riquier, R.; Rousseaux, C.; Sary, G.; Soullié, G.; Sozet, M.; Ta-Phuoc, K.; Trela, J.; Trauchessec, V.; Vaisseau, X.; Vauzour, B.; Villette, B.; Lefebvre, E.

doi:10.1016/j.hedp.2024.101125

High Energy Density Physics

2024

DOI: 10.1016/j.hedp.2024.101125

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Experimental capabilities of the LMJ-PETAL facility

W. Cayzac,

G. Boutoux,

S. Brygoo

et al.

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2024

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Efficient backward x-ray emission in a finite-length plasma irradiated by a laser pulse of picosecond duration

Yeh,

Tangtartharakul,

Tang

et al. 2024

Physics of Plasmas

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Motivated by experiments employing picosecond-long, kilojoule laser pulses, we examined x-ray emission in a finite-length underdense plasma irradiated by such a pulse using two-dimensional particle-in-cell simulations. We found that, in addition to the expected forward emission, the plasma also efficiently emits in the backward direction. Our simulations reveal that the backward emission occurs when the laser exits the plasma. The longitudinal plasma electric field generated by the laser at the density down-ramp turns around some of the laser-accelerated electrons and re-accelerates them in the backward direction. As the electrons collide with the laser, they emit hard x rays. The energy conversion efficiency is comparable to that for the forward emission, but the effective source size is smaller. We show that the picosecond laser duration is required for achieving a spatial overlap between the laser and the backward energetic electrons. At peak laser intensity of 1.4×1020 W/cm2, backward-emitted photons (energies above 100 keV and 10° divergence angle) account for 2×10−5 of the incident laser energy. This conversion efficiency is three times higher than that for similarly selected forward-emitted photons. The source size of the backward photons (5 μm) is three times smaller than the source size of the forward photons.

show abstract

Efficient backward x-ray emission in a finite-length plasma irradiated by a laser pulse of picosecond duration

Yeh,

Tangtartharakul,

Tang

et al. 2024

Physics of Plasmas

View full text Add to dashboard Cite

show abstract

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Experimental capabilities of the LMJ-PETAL facility

Cited by 1 publication

References 48 publications

Efficient backward x-ray emission in a finite-length plasma irradiated by a laser pulse of picosecond duration

Efficient backward x-ray emission in a finite-length plasma irradiated by a laser pulse of picosecond duration

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