RADIATION PROTECTION ›› 2022, Vol. 42 ›› Issue (2): 89-101.

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Progress of absorption method in pulsed X-ray spectra measurement generated by ultra-short ultra-intense laser-solid interaction

SONG Honghu1,2, YI Hongchang1,2, WEI Shuoyang1,2, WU Zhen1,2, ZHANG Hui1,2, LI Junli1,2, QIU Rui1,2   

  1. 1. Department of Engineering Physics,Tsinghua University,Beijing 100084;
    2. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education,Beijing 100084
  • Received:2021-09-02 Online:2022-03-20 Published:2022-04-29

Abstract: The measurement of pulsed X-ray energy spectrum in ultra-short and ultra-intense laser facility is of great significance and reference value in the field of diagnosis and radiation protection. Presently many countries have established ultra-short and ultra-intense laser facility research platforms, and plenty of research have been conducted in this area. This paper introduces Ross Pair and differential absorption methods, which are commonly used in low and medium energy spectrum measurement for pulsed X-ray produced by laser-solid interaction. This paper also reviews the research progress and applicability of these two methods in recent years from the aspects of detector structure, filter material selection, detection medium selection, scattering control, and unfolding methods, with the aim to provide a reference for domestically related research and application. The detector structure based on absorption method mainly includes stack and array designs: stack design is more suitable for the angular distribution measurement of energy spectrum, while to some extent array design could control X-ray scattering and give evaluations of detector crosstalk. The filter material selection, scattering control and unfolding method are optimized based on the spectrometer designed in San Diego Laboratory. In addition, the detector media is mainly a passive imaging plate or thermoluminescence detector. Due to the inconvenience of off-line operation, researchers are committed to using active detectors, such as scintillators and semiconductor detectors, to achieve active measurement of pulsed X-ray energy spectrum.

Key words: ultra-short and ultra-intense laser, pulsed X-ray, absorption method, spectra

CLC Number: 

  • TL817