SuperFGD prototype time resolution studies
Abstract
The SuperFGD will be a part of the ND280 near detector of the T2K and Hyper Kamiokande projects, that will help to reduce systematic uncertainties related with neutrino flux and cross-section modeling. The upgraded ND280 will be able to perform a full exclusive reconstruction of the final state from neutrino-nucleus interactions, including measurements of low momentum protons, pions and, for the first time, event-by event measurements of neutron kinematics. The time resolution defines the neutron energy resolution. We present the results of time resolution measurements made with the SuperFGD prototype that consists of 9216 plastic scintillator cubes (cube size is 1 cm) readout with 1728 wavelength-shifting fibers going along three orthogonal directions. We use data from the muon beam exposure at CERN. The time resolution of 0.97 ns was obtained for one readout channel after implementing the time calibration with a correction for the time-walk effect. The time resolution improves with energy deposited in a scintillator cube. Averaging two readout channels for one scintillator cube improves the time resolution to 0.68 ns which means that signals in different channels are not synchronous. Therefore the contribution from the time recording step of 2.5 ns is averaged as well. Averaging time values from N channels improves the time resolution by . Therefore a very good time resolution should be achievable for neutrons since neutron recoils hit typically several scintillator cubes and in addition produce larger amplitudes than muons. Measurements performed with a laser and a wide-bandwidth oscilloscope demonstrated that the time resolution obtained with the muon beam is not far from its expected limit. The intrinsic time resolution of one channel is 0.67 ns for signals of 56 photo-electron typical for minimum ionizing particles.
Keywords
Cite
@article{arxiv.2206.10507,
title = {SuperFGD prototype time resolution studies},
author = {I. Alekseev and T. Arihara and V. Baranov and L. Bartoszek and L. Bernardi and A. Blondel and A. V. Boikov and M. Buizza-Avanzini and F. Cadoux and J. Capó and J. Cayo and J. Chakrani and P. S. Chong and A. Chvirova and M. Danilov and Yu. I. Davydov and A. Dergacheva and N. Dokania and D. Douqa and O. Drapier and A. Eguchi and Y. Favre and D. Fedorova and S. Fedotov and Y. Fujii and F. Gastaldi and A. Gendotti and V. Glagolev and R. Guillaumat and K. Iwamoto and M. Jakkapu and C. Jesús-Valls and C. K. Jung and H. Kakuno and S. P. Kasetti and M. Khabibullin and A. Khotjantsev and H. Kikutani and T. Kobayashi and S. Kodama and A. Korzenev and U. Kose and Y. Kudenko and T. Kutter and D. Last and B. Li and Z. Li and L. S. Lin and S. Lin and M. Louzir and T. Lux and L. Maret and S. Martynenko and T. Matsubara and C. Mauger and C. McGrew and A. Mefodiev and O. Mineev and T. Nakadaira and K. Nakagiri and J. Nanni and L. Nicola and E. Noah and V. Paolone and S. Parsa and R. Pellegrino and M. A. Ramirez and M. Reh and C. Ricco and A. Rubbia and K. Sakashita and F. Sanchez and D. Sgalaberna and A. Shvartsman and N. Skrobova and I. A. Suslov and S. Suvorov and D. Svirida and A. Teklu and V. V. Tereshchenko and M. Tzanov and I. I. Vasilyev and K. Wood and G. Yang and N. Yershov and M. Yokoyama and Y. Yoshimoto and X. Zhao and P. Zilberman and E. D. Zimmerman},
journal= {arXiv preprint arXiv:2206.10507},
year = {2023}
}
Comments
12 pages, 9 figures. Revised text, results unchanged