MeV bremsstrahlung X rays from intense laser interaction with solid foils

Palaniyappan, S.; Gautier, D. C.; Tobias, B. J.; Fernandez, J. C.; Mendez, J.; Burris-Mog, T.; Huang, C. K.; Favalli, A.; Hunter, J. F.; Espy, M. E.; Schmidt, D. W.; Nelson, R. O.; Sefkow, A.; Shimada, T.; Johnson, R. P.

doi:10.1017/S0263034618000551

MeV bremsstrahlung X rays from intense laser interaction with solid foils

Journal Article · Sat Dec 01 00:00:00 EST 2018 · Laser and Particle Beams

DOI:https://doi.org/10.1017/S0263034618000551· OSTI ID:1499351

^[1]; Gautier, D. C. ^[1]; Tobias, B. J. ^[1]; Fernandez, J. C. ^[1]; Mendez, J. ^[1]; Burris-Mog, T. ^[1]; Huang, C. K. ^[1]; Favalli, A. ^[1]; Hunter, J. F. ^[1]; Espy, M. E. ^[1]; Schmidt, D. W. ^[1]; Nelson, R. O. ^[1]; Sefkow, A. ^[2]; Shimada, T. ^[1]; Johnson, R. P. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Rochester, NY (United States)

Laser-based compact MeV X-ray sources are useful for a variety of applications such as radiography and active interrogation of nuclear materials. MeV X rays are typically generated by impinging the intense laser onto ~mm-thick high-Z foil. Here, we have characterized such a MeV X-ray source from 120 TW (80 J, 650 fs) laser interaction with a 1 mm-thick tantalum foil. Our measurements show X-ray temperature of 2.5 MeV, flux of 3 × 10¹² photons/sr/shot, beam divergence of ~0.1 sr, conversion efficiency of ~1%, that is, ~1 J of MeV X rays out of 80 J incident laser, and source size of 80 m. Our measurement also shows that MeV X-ray yield and temperature is largely insensitive to nanosecond laser contrasts up to 10^-5. Also, preliminary measurements of similar MeV X-ray source using a double-foil scheme, where the laser-driven hot electrons from a thin foil undergoing relativistic transparency impinging onto a second high-Z converter foil separated by 50–400 m, show MeV X-ray yield more than an order of magnitude lower compared with the single-foil results.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1499351

Report Number(s):: LA-UR-18-25214

Journal Information:: Laser and Particle Beams, Journal Name: Laser and Particle Beams Journal Issue: 04 Vol. 36; ISSN 0263-0346; ISSN applab

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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