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Picosecond timing of charged particles using the TORCH detector
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(2022) Picosecond timing of charged particles using the TORCH detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1038 . 166950. doi:10.1016/j.nima.2022.166950 ISSN 0168-9002.
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Official URL: https://doi.org/10.1016/j.nima.2022.166950
Abstract
TORCH is a large-area, high-precision time-of-flight (ToF) detector designed to provide charged-particle identification in the 2–20 GeV/ momentum range. Prompt Cherenkov photons emitted by charged hadrons as they traverse a 10 mm quartz radiator are propagated to the periphery of the detector, where they are focused onto an array of micro-channel plate photomultiplier tubes (MCP-PMTs). The position and arrival times of the photons are used to infer the particles’ time of entry in the radiator, to identify hadrons based on their ToF. The MCP-PMTs were developed with an industrial partner to satisfy the stringent requirements of the TORCH detector. The requirements include a finely segmented anode, excellent time resolution, and a long lifetime. Over an approximately 10 m flight distance, the difference in ToF between a kaon and a pion with 10 GeV/ momentum is 35 ps, leading to a 10–15 ps per track timing resolution requirement. On average 30 photons per hadron are detected, which translates to a single-photon time resolution of 70 ps. The TORCH R&D program aims to demonstrate the validity of the detector concept through laboratory and beam tests, results from which are presented. A timing resolution of 70–100 ps was reached in beam tests, approaching the TORCH design goal. Laboratory timing tests consist of operating the MCP-PMTs coupled to the TORCH readout electronics. A time resolution of 50 ps was measured, meeting the TORCH target timing resolution.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||
Library of Congress Subject Headings (LCSH): | Particles (Nuclear physics), Picosecond pulses, Time measurements, Cherenkov counters | ||||||||||||
Journal or Publication Title: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | ||||||||||||
Publisher: | Elsevier BV | ||||||||||||
ISSN: | 0168-9002 | ||||||||||||
Official Date: | 1 September 2022 | ||||||||||||
Dates: |
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Volume: | 1038 | ||||||||||||
Article Number: | 166950 | ||||||||||||
DOI: | 10.1016/j.nima.2022.166950 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 13 September 2022 | ||||||||||||
Date of first compliant Open Access: | 14 September 2022 | ||||||||||||
RIOXX Funder/Project Grant: |
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