Background and Aims

The Extreme Light Infrastructure (ELI) Beamlines is a state-of-the-art laser driven accelerator facility located in the Czech Republic. It will operate the most intense non-military laser system with ultra-high power up to 10 PW, concentrated plasma intensities of up to 10²⁴ Wcm^-2, and ultra-short laser pulses of the order of few femtoseconds. Lasers of a several hundred TWs are already capable of producing a large amount of ionizing radiation when interacting with suitable targets. Thus prompts the need for accurate dosimetry in ultra-short pulsed fields; this is a need shared with FLASH radiotherapy facilities alike. Solid-state detectors, such as Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) detectors are promising technique used for this purpose. They are immune to electromagnetic pulses and the liberated electron-hole pairs are trapped on a 10^-15 s to 10^-13 s timescale.

Methods

Within the compass of the 18HLT04 UHDpulse EMPIR project, TL and OSL detectors are irradiated in stray radiation fields at ELI Beamlines. Several luminescent materials are used. Exploiting different laser and experimental setups and different distances from the source, it is possible to investigate a wide range of dose rates.

Results

Detector responses are evaluated and compared to Monte Carlo expectations. Preliminary results are presented.

Conclusions

The results show how the irradiated luminescence dosimeters respond in complex radiation fields.

This project 18HLT04 UHDpulse has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 research and innovation programme.