Transient absorption measurement of laser-accelerated ion bunch radiolysis on sub-ps timescales

A. Prasselsperger; J. Liese; A.-K. Schmidt; F. Balling; S. Gerlach; L. Doyle; M. Bachhammer; J. Hartmann; T. Rösch; M. Yeung; B. Dromey; J. Schreiber

doi:10.1117/12.2665576

8 June 2023 Transient absorption measurement of laser-accelerated ion bunch radiolysis on sub-ps timescales

A. Prasselsperger, J. Liese, A.-K. Schmidt, F. Balling, S. Gerlach, L. Doyle, M. Bachhammer, J. Hartmann, T. Rösch, M. Yeung, B. Dromey, J. Schreiber

Author Affiliations +

Proceedings Volume 12583, Applying Laser-driven Particle Acceleration III: Using Distinctive Energetic Particle and Photon Sources; 1258302 (2023) https://doi.org/10.1117/12.2665576
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Modern laser-based accelerators for ions reach peak kinetic ion energies of > 100MeV, over 1MA of total beam currents with only a few picoseconds of bunch duration in close vicinity to the target at ≈ 1 Hz repetition rate and with a high controllability. Thus, the number of potential applications is growing rapidly. This raises a high interest in the processes of ion-matter-interactions in the energy deposition region of these ultra-intense particle bunches. In our recent experiments we investigated these interactions by single-shot time-resolved optical streaking of the energy deposition region of laser-accelerated proton bunches in liquid water. The absolute timing reference provided by the x-rays emitted from the laser-plasma-interaction and the sub-ps time resolution revealed that ionized electrons solvate > 20 ps delayed compared to experiments with lower deposited energy density. In this paper we discuss first approaches to explain these observations by micro-dosimetric considerations regarding the background molecules excitation of vibration states and polarization. This is highly relevant for applications, e.g. to understand the FLASH-effect in radio-biology. We further present the planned experiments at the Centre for Advanced Laser Applications where these phenomena will be investigated in more detail with advanced diagnostics.

Conference Presentation

Citation Download Citation

A. Prasselsperger, J. Liese, A.-K. Schmidt, F. Balling, S. Gerlach, L. Doyle, M. Bachhammer, J. Hartmann, T. Rösch, M. Yeung, B. Dromey, and J. Schreiber "Transient absorption measurement of laser-accelerated ion bunch radiolysis on sub-ps timescales", Proc. SPIE 12583, Applying Laser-driven Particle Acceleration III: Using Distinctive Energetic Particle and Photon Sources, 1258302 (8 June 2023); https://doi.org/10.1117/12.2665576

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