Mainz 2022 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 13: Diagnostics, Control and Instrumentation 2

AKBP 13.6: Vortrag

Donnerstag, 31. März 2022, 15:15–15:30, AKBP-H13

Intensity monitoring of pulsed ion beams: Absolute calibration of the I-BEAT detector — •Ina Hofrichter, Sonja Gerlach, Felix Balling, Jonathan Bortfeldt, Leonard Doyle, Lotta Flaig, Jens Hartmann, Veronika Kratzer, Alexander Praßelsperger, Thomas Rösch, Anna Schmidt, Katia Parodi, and Jörg Schreiber — LMU München, München, Deutschland

The unique properties of laser-accelerated ion bunches - like their high particle flux accompanied by a strong electromagnetic pulse (EMP) - make beam monitoring challenging for well-established diagnostic systems with immediate feedback. The I-BEAT (Ion-Bunch Energy Acoustic Tracing) detector (cf. DOI: s41598-019-42920-5, DOI: 12.2592415) overcomes these difficulties by making use of the ionoacoustic principle: The energy deposited by ions stopping in water generates an acoustic wave from which the ion bunch properties can be reconstructed. The experimental setup consists of a water reservoir surrounded by ultrasonic transducers. Ions enter the detector through a Kapton entrance window. To enable quantitative assessment of the particle number and accordingly the absorbed dose, proper calibration of the detector is required. For that, we propose to use the signal generated in the entrance window, exploiting that its amplitude increases with growing ion number. We have set up a theoretical model to describe this signal and performed first experimental tests to validate our approach with an ionization chamber. This work was supported by the German Research Foundation (DFG) within the Research Training Group GRK 2274 and the BMBF under project 05P21WMFA1.