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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 17: Instrumentation III

AKBP 17.4: Talk

Thursday, March 23, 2023, 18:15–18:30, CHE/0183

Time-Resolved Interferometric Measurement of Ultrasound Pulses in Water — •Julia Liese, Anna-Katharina Schmidt, Alexander Prasselsperger, Jens Hartmann, and Jörg Schreiber — LMU München, Fakultät für Physik - Medizinische Physik, Am Coulombwall 1, 85748 Garching

Current development in laser-driven ion acceleration demands for reliable techniques for ion beam monitoring. The ultra-short and intense ion bunches with a broad spread in energy are a challenge for conventional beam detectors. Our group recently presented a new approach for online detection of laser-accelerated ions referred to as Ion-Bunch Energy Acoustic Tracing (I-BEAT) [1]. This method is based on measuring the pressure pulse induced by ions stopping in water with piezoelectric transducers. Here, we investigate an optical method based on measurements of the refractive index change associated with the pressure pulse by femtosecond laser pulse probing. In contrast to transducer measurements, we can thus study the volume of the pressure pulse origin directly. To this end, an interferometric setup was tested in first experiments with ultrasound pulses generated by a piezoelectric transducer. Experimental results show temporally resolved images of the ultrasound pulse and reveal characteristics of the ultrasound pulse in agreement with theory. Within an ongoing project funded by the DFG (491853809), the pressure waves originating from laser-accelerated ions will be investigated optically to facilitate new insights into the fast dynamics of ion energy deposition.

[1] D. Haffa et al., Sci. Rep. 9 (2019), 6714.