Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities

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QIU Rui, ZHANG Hui, YANG Bo, James C, Sayed H, Michael B and LI Jun-Li. Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities[J]. Chinese Physics C, 2014, 38(12): 129001. doi: 10.1088/1674-1137/38/12/129001
QIU Rui, ZHANG Hui, YANG Bo, James C, Sayed H, Michael B and LI Jun-Li. Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities[J]. Chinese Physics C, 2014, 38(12): 129001.  doi: 10.1088/1674-1137/38/12/129001 shu
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Received: 2013-12-09
Revised: 2014-07-07
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Dose estimation and shielding calculation for X-ray hazard at highintensity laser facilities

    Corresponding author: LI Jun-Li,

Abstract: An ionizing radiation hazard produced from the interaction between high intensity lasers and solid targets has been observed. Laser-plasma interactions create "hot" electrons, which generate bremsstrahlung X-rays when they interact with ions in the target. However, up to now only limited studies have been conducted on this laser-induced radiological protection issue. In this paper, the physical process and characteristics of the interaction between high intensity lasers and solid targets are analyzed. The parameters of the radiation sources are discussed, including the energy conversion efficiency from laser to hot electrons, hot electron energy spectrum and electron temperature, and the bremsstrahlung X-ray energy spectrum produced by hot electrons. Based on this information, the X-ray dose generated with high-Z targets for laser intensities between 1014 and 1020 W/cm2 is estimated. The shielding effects of common shielding items such as the glass view port, aluminum chamber wall and concrete wall are also studied using the FLUKA Monte Carlo code. This study provides a reference for the dose estimation and the shielding design of high intensity laser facilities.

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