A scintillating fiber imaging spectrometer for active characterisation of laser-driven proton beams

Patel, J. K. and Armstrong, C. D. and Wilson, R. and Alderton, M. and Dolier, E. J. and Frazer, T. P. and Horne, A. and Lofrese, A. and Peat, M. and Woodward, M. and Zielbauer, B and Clarke, R. J. and Deas, R. and Rajeev, P. P. and Gray, R. J. and McKenna, P. (2024) A scintillating fiber imaging spectrometer for active characterisation of laser-driven proton beams. High Power Laser Science and Engineering. ISSN 2052-3289 (In Press) (https://doi.org/10.1017/hpl.2024.62)

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Abstract

Next generation high-power laser facilities are expected to generate hundreds-of-MeV proton beams and operate at multi-Hz repetition-rates, presenting opportunities for medical, industrial and scientific applications requiring bright pulses of energetic ions. Characterising the spectro-spatial profile of these ions at high repetition-rates in the harsh radiation environments created by laser-plasma interactions remains challenging but is paramount for further source development. To address this, we present a compact scintillating fiber imaging spectrometer based on the tomographic reconstruction of proton energy deposition in a layered fiber array. Modelling indicates that spatial resolution of ∼1 mm and energy resolution of<10% at protons energies>20 MeV are readily achievable with existing 100 μmdiameter fibers. Measurements with a prototype beam profile monitor using 500 μmfibers demonstrate active readout with invulnerability to electromagnetic pulses, and <100 Gy sensitivity. The performance of the full instrument concept is explored with Monte-Carlo simulations, accurately reconstructing a proton beam with a multiple-component spectro-spatial profile.

ORCID iDs

Patel, J. K., Armstrong, C. D., Wilson, R., Alderton, M. ORCID logoORCID: https://orcid.org/0000-0002-4043-0393, Dolier, E. J., Frazer, T. P., Horne, A., Lofrese, A., Peat, M., Woodward, M., Zielbauer, B, Clarke, R. J., Deas, R., Rajeev, P. P., Gray, R. J. ORCID logoORCID: https://orcid.org/0000-0003-0610-9595 and McKenna, P. ORCID logoORCID: https://orcid.org/0000-0001-8061-7091;
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