München 2019 – wissenschaftliches Programm
P 10.2: Vortrag
Dienstag, 19. März 2019, 14:30–14:45, HS 20
Hot electron dynamics in ultra intense laser plasma experiments revealed from detection of bremsstrahlung spectra — •Maria Molodtsova1, 2, Anna Ferrari1, Alejandro Laso Garcia1, Josefine Metzkes-Ng1, Stephan Kraft1, Benjamin Lutz1, Irene Prencipe1, Manfred Sobiella1, Daniel Stach1, David Weinberger1, Tim Ziegler1, 2, Ulrich Schramm1, 2, and Thomas Cowan1, 2 — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR) — 2Technische Universität Dresden
Using high-intensity short-pulse lasers (I ∼1021 W/cm2), plasma generation, extreme states of matter and new accelerator concepts are explored, enabling technological breakthrough in material science and medicine. A critical component is the characterization of relativistic electrons that are accelerated and transported in the ionized material of the target, generating ultra-intense bremsstrahlung. Measuring this bremsstrahlung spectrum is therefore a crucial aspect of plasma diagnostics. In this work it is shown how photon spectra can be reconstructed using calorimetric techniques, making possible to study the hot electron dynamics in the laser-generated plasma. Calorimeters with different readouts are under development at HZDR for this purpose. Absorption properties of different targets were studied in a measurement campaign at the in-house Terawatt laser DRACO. A large data set was taken both with passive and active calorimeter prototypes to find correlations between target material and thickness and the resulting electron and ion spectra. Results from this campaign together with the detector concepts are presented here.