Abstract
TORCH is a time-of-flight detector that is being developed for the Upgrade II of the LHCb experiment, with the aim of providing charged particle identification over the momentum range 2-10 GeV/c. A small-scale TORCH demonstrator with customised readout electronics has been operated successfully in beam tests at the CERN PS. Preliminary results indicate that a single-photon resolution better than 100 ps can be achieved.
Highlights
Micro-channel plate PMTsTo achieve the required angular resolution of TORCH, each MCPPMT detector requires 128 × 8 effective granularity in the transverse and longitudinal projections over a 53 × 53 mm active area, with 11 MCP-PMTs per module
TORCH is a time-of-flight detector that is being developed for the Upgrade II of the LHCb experiment, with the aim of providing charged particle identification over the momentum range 2–10 GeV/c
To survive the LHC environment, each MCP-PMT must be capable of withstanding a large integrated charge on its anode (5 C cm−2), achieved using an atomic-layer deposition (ALD) coating [5,6]
Summary
To achieve the required angular resolution of TORCH, each MCPPMT detector requires 128 × 8 effective granularity in the transverse and longitudinal projections over a 53 × 53 mm active area, with 11 MCP-PMTs per module. The MCP-PMTs [4] are developed with industrial partners, Photek UK. To survive the LHC environment, each MCP-PMT must be capable of withstanding a large integrated charge on its anode (5 C cm−2), achieved using an atomic-layer deposition (ALD) coating [5,6]. The MCP-PMTs are read out with a customised electronics system [7], and utilise the NINO32 [8] and HPTDC [9] chipsets, developed for fast timing applications of the ALICE experiment
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