Speaker
Description
Over the past few decades, laser-based particle accelerators have made tremendous progress and attracted ever more interest from the wider scientific community. Multiterawatt and petawatt high-power lasers facilities are now a reality and have applications in physics, material science, medicine, life science, and laboratory astrophysics. The radiation generated in experiments using such laser systems leads to high prompt doses and potentially to the activation of the surrounding materials. Unfortunately, in comparison with conventional accelerators, accurate dosimetry at laser-accelerated beams is still a challenge. The radiation fields produced are pulsed, mixed, and with high instantaneous fluxes and high dose rates. While new dosimetric techniques are being developed, important efforts are being put in the study of the behavior of known dosimetry systems in radiation fields at laser accelerators.
This work presents a study of passive solid-state detectors for the measurement of pulsed radiation performed at experimental station ALFA. ALFA was commissioned at the ELI Beamlines laser-driven user facility. Laser pulses ( <20 fs, 1kHz, 1.5 TW) were carefully focused inside supersonic gas targets to generate an ultra-short (fs) ultra-relativistic (10s MeV) electron beam. The produced secondary radiation field was studied and has provided useful insights in dosimetry at laser accelerator. To achieve better understanding, a combination of different solid-state dosimetric systems were irradiated: film badges and optically stimulated luminescence, thermoluminesce, and radiophotoluminescence dosimeters. Furthermore, detailed Monte Carlo simulations were performed. This contribution presents the obtained experimental data and their comparison to Monte Carlo predictions.