Radiation Protection Around High-intensity Laser Interactions with Solid Targets

Liang, Taiee Ted; Bauer, Johannes M.; Liu, James C.; Rokni, Sayed H.

doi:10.1097/hp.0000000000000927

Title: Radiation Protection Around High-intensity Laser Interactions with Solid Targets

Abstract

Interaction of a high-intensity optical laser with a solid target can generate an ionizing radiation hazard in the form of high-energy "hot" electrons and bremsstrahlung, resulting from hot electrons interacting with the target itself and the surrounding target chamber. Previous studies have characterized the bremsstrahlung dose yields generated by such interactions for lasers in the range of 10¹⁷ to 10²² W cm^-2 using particle-in-cell code EPOCH and Monte Carlo code FLUKA. Electron measurements based on a depth-dose approach are presented for two laser intensities, which indicate a Maxwellian distribution is more suitable for estimating the hot electrons' energy distribution. Also, transmission factors for the resulting bremsstrahlung for common shielding materials are calculated with FLUKA, and shielding tenth-value-layer thicknesses are also derived. In combination with the bremsstrahlung dose yield, the tenth-value layers provide radiation protection programs the means to evaluate radiation hazards and design shielding for high-intensity laser facilities.

Authors:

Liang, Taiee Ted ^[1]; Bauer, Johannes M. ^[1]; Liu, James C. ^[1]; Rokni, Sayed H. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States)

Publication Date:: Mon Sep 24 00:00:00 EDT 2018

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1490422

Grant/Contract Number:: AC02-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Health Physics

Additional Journal Information:: Journal Volume: 115; Journal Issue: 6; Journal ID: ISSN 0017-9078

Publisher:: Health Physics Society

Country of Publication:: United States

Language:: English

Subject:: 61 RADIATION PROTECTION AND DOSIMETRY; bremsstrahlung; lasers; radiation protection; shielding

Citation Formats


                    Liang, Taiee Ted, Bauer, Johannes M., Liu, James C., and Rokni, Sayed H. Radiation Protection Around High-intensity Laser Interactions with Solid Targets.  United States: N. p., 2018. 
Web.  doi:10.1097/hp.0000000000000927.

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                    Liang, Taiee Ted, Bauer, Johannes M., Liu, James C., & Rokni, Sayed H. Radiation Protection Around High-intensity Laser Interactions with Solid Targets.  United States.  https://doi.org/10.1097/hp.0000000000000927

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                    Liang, Taiee Ted, Bauer, Johannes M., Liu, James C., and Rokni, Sayed H. Mon .  
"Radiation Protection Around High-intensity Laser Interactions with Solid Targets".  United States.  https://doi.org/10.1097/hp.0000000000000927.  https://www.osti.gov/servlets/purl/1490422.

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@article{osti_1490422,

  title        = {Radiation Protection Around High-intensity Laser Interactions with Solid Targets},

  author       = {Liang, Taiee Ted and Bauer, Johannes M. and Liu, James C. and Rokni, Sayed H.},

  abstractNote = {Interaction of a high-intensity optical laser with a solid target can generate an ionizing radiation hazard in the form of high-energy "hot" electrons and bremsstrahlung, resulting from hot electrons interacting with the target itself and the surrounding target chamber. Previous studies have characterized the bremsstrahlung dose yields generated by such interactions for lasers in the range of 1017 to 1022 W cm-2 using particle-in-cell code EPOCH and Monte Carlo code FLUKA. Electron measurements based on a depth-dose approach are presented for two laser intensities, which indicate a Maxwellian distribution is more suitable for estimating the hot electrons' energy distribution. Also, transmission factors for the resulting bremsstrahlung for common shielding materials are calculated with FLUKA, and shielding tenth-value-layer thicknesses are also derived. In combination with the bremsstrahlung dose yield, the tenth-value layers provide radiation protection programs the means to evaluate radiation hazards and design shielding for high-intensity laser facilities.},

  doi          = {10.1097/hp.0000000000000927},

  journal      = {Health Physics},

  number       = 6,

  volume       = 115,

  place        = {United States},

  year         = {Mon Sep 24 00:00:00 EDT 2018},

  month        = {Mon Sep 24 00:00:00 EDT 2018}

}

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https://doi.org/10.1097/hp.0000000000000927

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Cited by: 2 works

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Figures / Tables:

Fig. 1: Energy distribution (MeV) of hot electrons calculated from an EPOCH simulation for 10²⁰ W cm⁻², where dN/dE is the number of electrons generated per laser shot. A Maxwellian fit gives $T$_$h$= 2.1 MeV (Liang et al. 2017b).

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