New probes are continuously investigated to explore the physics of laser-plasma interactions. Charged particle detection systems and optical probing are well established techniques. The investigation of the bremsstrahlung generated in laser plasma remains, however, a relatively uncommon method to study these interactions.
In this talk we will present the developments in gamma calorimetry developed at HZDR. Currently, sampling calorimeters based on image plates as well as CCD cameras have been developed. The technique has been used to study bremsstrahlung generated with solid targets, by laser-wakefield accelerated (LWFA) electrons through a radiator and inverse Compton scattered X-rays, as well as calibrated radioactive X-Ray sources (Co60 and Cs137).
We will show how spectra with different functional parametrization can be reconstructed from the dose deposited in the detector. The energy range covered by such a detector is shown to be from a few hundred keV (from inverse Compton X-rays and standard radiation sources) with a Gaussian-like shape, through a few MeV (from solid target bremsstrahlung) up to tens of MeV (generated by LWFA electrons through a radiator).
|Working group||Laser-driven ion acceleration|