An active dose-measuring device for X-rays generated by ultra-short, ultra-intense laser pulses. (3rd March 2023)

• Record Type: Journal Article
• Authors: Wang, Fengdie; Wang, Zhonghai; Wu, Yuchi; Wang, Shaoyi; Yan, Yonghong; Yu, Minghai; Zhang, Xiaohui; Wen, Jiaxing; Tan, Fang; Yang, Yue; Zhang, Jie; Zhou, Rong; Yang, Chaowen
• Is Part Of: Journal of instrumentation. Volume 18:Number 3(2023)
• Publication Date: 2023-03-03
• Subjects: Detector design and construction technologies and materials -- Radiation damage monitoring systems -- X-ray detectors -- Models and simulations; Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/18/03/P03005
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: Ultra-short, ultra-intense laser pulses can create extreme physical conditions for a wide range of applications in atomic and molecular physics, materials chemistry, and inertial-confinement fusion. However, laser-matter interactions can be accompanied by significant X-ray emission that introduces radiation risks to the nearby environment and personnel. It is usually to monitor the radiation dose during in high-intensity laser-target interactions with optically stimulated luminescence and thermo-luminescence devices. However, these passive methods cannot measure the radiation dose in real time, while most active dosimeters cannot accurately measure pulsed radiation doses. Here, transient pulse X-ray radiation doses are converted by CdWO4 crystals into slow signals. Because the crystals have a 14-μs luminescence decay time, they can absorb sub-nanosecond X-ray pulses and release the energy at a 100-μs rate, thus reducing the linear-response pressure of subsequent devices. A pulse detector based on a CdWO4 crystal, a phototube, and a custom signal-processing circuit was developed. Experiments were performed at the 45-TW femtosecond laser facility of the Laser Fusion Research Center. The detector deviation was less than ±20% relative to that of an ionization-chamber detector. This initially verified its feasibility for real-time pulsed X-ray radiation detection.