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Optical calibration systems of the Pacific Ocean Neutrino Experiment
Journal article   Open access   Peer reviewed

Optical calibration systems of the Pacific Ocean Neutrino Experiment

M Agostini, A Alexander Wight, M Altomare, K Baş, N Baily, P.S Barbeau, A.J Baron, S Bash, C Bellenghi, M Boehmer, …
Journal of instrumentation, v 21(7), P07029
01 Jul 2026
url
https://doi.org/10.1088/1748-0221/21/07/P07029View
Published, Version of Record (VoR) Open

Abstract

Calibration Driver circuits Field effect transistors Gallium nitrides Isotropy Modules Neutrinos Pulse generators Semiconductor devices
This work presents the design and performance characterization of the optical calibration systems produced for the Pacific Ocean Neutrino Experiment (P-ONE), which target gain, energy and time calibration in the detector. These systems include novel light-pulse driver circuitry based on gallium nitride field-effect transistor technology and its application to directional and isotropic, self-monitoring optical calibration instruments. A total of 330 directional light pulsers and two isotropic, 17-inch calibration modules (P-CALs) were produced for the first P-ONE line. We present the designs and performance of both the directional and isotropic calibration devices and perform detailed optical characterizations of both full-production batches. In a wavelength range of 365 – 520 nm, our developed driver circuits achieve emission intensities up to 1011 photons and pulse widths as small as 1.4 ns, respectively. Light-pulse drivers and self-monitoring electronics in the P-CAL were characterized using the same experimental setup, and the instrument's optical-isotropy design was optimized in combination with a dedicated GEANT4-based simulation framework. The optimized P-CAL achieves a simulated isotropy grade of 1.00 ± 0.01 across the entire 4π solid angle range. These simulation investigations were explicitly confirmed by dedicated measurements in both air and water using two independent experimental setups, and we report the results. With this, a detailed performance estimate for deployed P-CAL modules in P-ONE was possible.

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