OCTOPOD: single-bunch tomography for angular-spectral characterization of laser-driven protons

Laser–plasma accelerated (LPA) proton bunches are now applied for research fields ranging from ultra-high-dose-rate radiobiology to material science. Yet, the capabilities to characterize the spectrally and angularly broad LPA bunches lag behind the rapidly evolving applications. The OCTOPOD transla...

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Bibliographic Details
Published in:High power laser science and engineering 2023-01, Vol.11, Article e68
Main Authors: Reimold, M., Assenbaum, S., Beyreuther, E., Bodenstein, E., Brack, F.-E., Eisenmann, C., Englbrecht, F., Kroll, F., Lindner, F., Masood, U., Pawelke, J., Schramm, U., Schneider, M., Sobiella, M., Umlandt, M. E. P., Vescovi, M., Zeil, K., Ziegler, T., Metzkes-Ng, J.
Format: Article
Language:English
Subjects:
Algorithms
Cyclotrons
Deposition
Dosimetry
Energy
Geometry
Lasers
laser–plasma acceleration of protons
Light
Light distribution
Pinholes
proton detector
Protons
Radiation
Radiobiology
Relativistic Laser Plasma Interaction (RLPI) Diagnostics
Scintillation counters
Sensors
tomographic reconstruction
Tomography
Ultrasonic imaging
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Summary:Laser–plasma accelerated (LPA) proton bunches are now applied for research fields ranging from ultra-high-dose-rate radiobiology to material science. Yet, the capabilities to characterize the spectrally and angularly broad LPA bunches lag behind the rapidly evolving applications. The OCTOPOD translates the angularly resolved spectral characterization of LPA proton bunches into the spatially resolved detection of the volumetric dose distribution deposited in a liquid scintillator. Up to 24 multi-pinhole arrays record projections of the scintillation light distribution and allow for tomographic reconstruction of the volumetric dose deposition pattern, from which proton spectra may be retrieved. Applying the OCTOPOD at a cyclotron, we show the reliable retrieval of various spatial dose deposition patterns and detector sensitivity over a broad dose range. Moreover, the OCTOPOD was installed at an LPA proton source, providing real-time data on proton acceleration performance and attesting the system optimal performance in the harsh laser–plasma environment.
ISSN:2095-4719
2052-3289
DOI:10.1017/hpl.2023.55