Objetivo
The Project proposes the design and construction of the prototype vacuum phototriode photodetectors for the CMS Forward Electromagnetic Detector. This detector must operate in the pseudorapidity range from 2.6 to 3.0 where radiation levels (both gamma and neutron) are extremely high. Operation so close to the beam-pipe area requires very high radiation resistance for all the main components of the calorimeter: electronic readout, scintillators and photodetectors. At present one can anticipate suitable radiation hard PbWO4 crystals being developed for this endcap. The goal of this project is to construct a photodetector with good quantum efficiency (>16% over the main scintillation spectrum of lead tungstate), moderate gain in a 4T axial field, and capable of operating up to gamma doses of 50kGy and neutron fluences of 7´1014 neutron/cm2.
Such detectors are proposed to be 25 mm diameter fine-mesh vacuum phototriodes with extremely radiation hard faceplates and photocathodes for a stable long-term performance under the LHC operating conditions. The production of radiation hard VPTs for the prototype of FED 5´5 super modules (in total 4 units, thus 100 prototype photodetectors) will form the basis for the construction of whole CMS Forward Electromagnetic Detector. All the team members have considerable experience of producing or evaluating such photodetectors, and in particular we have the expertise to develop and evaluate radiation resistant devices. The proposed programme opens up new ways for using vacuum photodetectors in physics experiments in areas where current silicon technology (e.g. avalanche photodiodes) will not survive
Convocatoria de propuestas
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UB8 3PH Uxbridge, London
Reino Unido