Abstract
The TORCH time-of-flight detector is being developed to provide particle identification between 2 and 10GeV/c momentum over a flight distance of 10m. TORCH is designed for large-area coverage, up to 30m2, and has a DIRC-like construction. The goal is to achieve a 15ps time-of-flight resolution per incident particle by combining arrival times from multiple Cherenkov photons produced within quartz radiator plates of 10mm thickness. A four-year R&D programme is underway with an industrial partner (Photek, UK) to produce 53×53mm2 Micro-Channel Plate (MCP) detectors for the TORCH application. The MCP-PMT will provide a timing accuracy of 40ps per photon and it will have a lifetime of up to at least 5Ccm−2 of integrated anode charge by utilizing an Atomic Layer Deposition (ALD) coating. The MCP will be read out using charge division with customised electronics incorporating the NINO chipset. Laboratory results on prototype MCPs are presented. The construction of a prototype TORCH module and its simulated performance are also described.
Highlights
The (TORCH Time Of internally Reflected CHerenkov light) detector [1] is an R&D project to develop a large-area time-offlight (ToF) system, up to around 30 m2
Cherenkov photons travel to the periphery of the detector by total internal reflection and their angles and arrival times are measured with MicroChannel Plate PMTs (MCPs)
Simulation has shown that a 1 mrad angular resolution is required [2] and, to achieve this, 128 Â 8 granularity MCPs of 53 Â 53 mm2 active area are being developed
Summary
The (TORCH Time Of internally Reflected CHerenkov light) detector [1] is an R&D project to develop a large-area time-offlight (ToF) system, up to around 30 m2. TORCH combines timing information with Detection of Internally Reflected Cherenkov light (DIRC)-type reconstruction, aiming to achieve a ToF resolution of approximately 10–15 ps per track. Cherenkov photons travel to the periphery of the detector by total internal reflection and their angles (positions) and arrival times are measured with MicroChannel Plate PMTs (MCPs). Simulation has shown that a 1 mrad angular resolution is required [2] and, to achieve this, 128 Â 8 granularity MCPs of 53 Â 53 mm active area are being developed. Assuming $ 30 detected photoelectrons over an active area of 30 m2, the timing of single photons to a precision of 70 ps is required
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