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Title: MeV bremsstrahlung X rays from intense laser interaction with solid foils

Abstract

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 × 10 12 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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Rochester, NY (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1499351
Report Number(s):
LA-UR-18-25214
Journal ID: ISSN 0263-0346; applab
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Laser and Particle Beams
Additional Journal Information:
Journal Volume: 36; Journal Issue: 04; Journal ID: ISSN 0263-0346
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Intense laser–plasma; MeV X-ray radiography

Citation Formats

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., and Johnson, R. P. MeV bremsstrahlung X rays from intense laser interaction with solid foils. United States: N. p., 2018. Web. doi:10.1017/S0263034618000551.
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. MeV bremsstrahlung X rays from intense laser interaction with solid foils. United States. doi:10.1017/S0263034618000551.
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., and Johnson, R. P. Sat . "MeV bremsstrahlung X rays from intense laser interaction with solid foils". United States. doi:10.1017/S0263034618000551.
@article{osti_1499351,
title = {MeV bremsstrahlung X rays from intense laser interaction with solid foils},
author = {Palaniyappan, S. and Gautier, D. C. and Tobias, B. J. and Fernandez, J. C. and Mendez, J. and Burris-Mog, T. and Huang, C. K. and Favalli, A. and Hunter, J. F. and Espy, M. E. and Schmidt, D. W. and Nelson, R. O. and Sefkow, A. and Shimada, T. and Johnson, R. P.},
abstractNote = {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.},
doi = {10.1017/S0263034618000551},
journal = {Laser and Particle Beams},
issn = {0263-0346},
number = 04,
volume = 36,
place = {United States},
year = {2018},
month = {12}
}

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