A Si-PAD and Tungsten Based Electromagnetic Calorimeter for the Forward Direct Photon Measurement at LHC
For the forward direct photon measurement at LHC-ALICE, we propose to construct a Forward Calorimeter (FoCal). FoCal-E is a silicon and tungsten calorimeter design, consists of low granularity Si-Pad layers (LGL) for precise measurement of photon energy and a few high granularity layers (HGL) with pixel readout to achieve an excellent position resolution to separate two photons from \(\pi ^0\). We performed R&D of LGL prototype since 2014. From results of past three years tests (2014 \(\sim \) 2016) at CERN PS and SPS, LGL prototype has a good linearity and the energy resolution is about \(10\%\). In addition, good agreement with theoretical values and simulation were observed about longitudinal shower profile.
KeywordsCalorimeter Electromagnetic shower Si-Pad detector Forward physics
This work was supported by JSPS KAKENHI Grant Numbers JP25287047, JP26220707, JP17H01122.
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