München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Laser Plasmas II

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 Molodtsova^{1, 2}, Anna Ferrari¹, Alejandro Laso Garcia¹, Josefine Metzkes-Ng¹, Stephan Kraft¹, Benjamin Lutz¹, Irene Prencipe¹, Manfred Sobiella¹, Daniel Stach¹, David Weinberger¹, Tim Ziegler^{1, 2}, Ulrich Schramm^{1, 2}, and Thomas Cowan^{1, 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.