A TLD-based ten channel system for the spectrometry of bremsstrahlung generated by laser-matter interaction

作者：Horst Felix^*; Fehrenbacher Georg; Radon Torsten; Kozlova Ekaterina; Rosmej Olga; Czarnecki Damian; Schrenk Oliver; Breckow Joachim; Zink Klemens

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 782: 69-76.

DOI：10.1016/j.srima.2015.02.010

• Laser acceleration
• X-ray spectrometry
• Thermoluminescence dosimetry
• Pulsed radiation

This work presents a thermoluminescence dosimetry based method for the measurement of bremsstrahlung spectra in the energy range from 30 keV to 100 MeV, resolved in ten different energy intervals and for the photon ambient dosimetry in ultrashort pulsed radiation fields as e.g generated during operation of the PHELIX laser at the GSI Helmholtzzentrum fur Schwerionenforschung. The method is a routine oriented development by application of a multi filter technique. The data analysis takes around 1 h. The spectral information is obtained by the unfolding of the response of ten thermoluminescence dosimeters with absorbers of different materials and thicknesses arranged as a stack each with a different response function to photon radiation. These response functions were simulated by the use of the Monte Carlo code FLUKA. An algorithm was developed to unfold bremssLrahlung spectra from the readings of the ten dosimeters. The method has been validated by measurements at a clinical electron linear accelerator (6 MV and 18 MV brernssLrahlung). First measurements at the PHEUX laser system were carried our in December 2013 and January 2014. Spectra with photon energies up to 10 MeV and mean energies up to 420 keV were observed at laser-intensities around 10(19) W/cm(2) on a titanium foil target. The measurement results imply that the steel walls of the target chamber might be an additional bright x-ray source.

• 出版日期2015-5-11
• 单位河北医科大学