Speaker
Masahiro Hirano
(University of Tsukuba (JP))
Description
FoCal is a proposed upgrade project for the ALICE experiment at LHC to
study the initial state of the high-energy heavy-ion collisions. FoCal com-
prises two calorimeters: an electro-magnetic calorimeter (FoCal-E) to mea-
sure the direct photons is complemented by a hadron calorimeter (FoCal-
H) to improve isolation and jet measurements. FoCal-E consists of low-
granularity silicon-pad (PAD) modules and high-granularity silicon-pixel (Monolithic Active Pixel Sensors: MAPS) modules, and has been designed as a Si+W sampling calorimeter.
In the current design, the FoCal-E structure consists of four PAD modules
and two MAPS modules. The main purpose of the MAPS modules is the
precise location of the position of the shower and the two-shower separation,
while the PAD modules are essential for a good measurement of the shower
energy. One PAD module has four layers each consisting of a tungsten tile
and an 8x8 silicon photodiode(of size 11.3x11.3 mm2) array, respectively.
The summed signal of four photodiode cells in same lateral position is read
out via a summing board and APV25 hybrid chips.
In this presentation, we show the detector performance of FoCal-E PAD sys-
tem, which has been evaluated in two test beam experiment at CERN PS
and SPS test beam lines in September and November in 2014, respectively.
Energy resolution, linearity in energy, and position resolution have been mea-
sured at these beam tests.
We also present an outlook and the current status of faster readout system
for the FoCal-E PAD using the SRS and VMM chips.
| On behalf of collaboration: | [Other] |
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Author
Masahiro Hirano
(University of Tsukuba (JP))
Co-authors
Motoi Inaba
(University of Tsukuba (JP))
Tatsuya Chujo
(University of Tsukuba (JP))
