CALICE
Dave Bailey
Aims and Objectives
• Develop the technology to build a highresolution tracking calorimeter for ILC
experiments
• Main thrusts:
– Testbeam work with prototype
– DAQ electronics development
– Mechanical assembly
ECAL
W/Si calorimeter (24 X0 with 29 W layers)
Weight full ECAL: ~ 112 T (80 barrel+32 End-Cap)
Barrel : 40 identical trapezoidal modules
End-Cap : constituted of 12 modules (3 types)
ECAL module : alveolar structure - carbon fibers compound
including half of W plates (fixed on HCAL End-Cap with rails)
 Minimization of dead zones
Detection elements (detector slab) in each alveolar case (Si+W),
FE chips integrated,
pad size : 5×5 mm2
Multi-module End-Cap
180
Barrel module
Opening plan
for full End-Cap
Détecteur SLAB
EUDET - Detector Slab
shielding: 100 µm (cooling ?)
Cables + packaging: 1000 µm
glue:
PCB:
600100
µmµm (ƒ pads size)
wafer: 300 µm
ground foil: 50 µm
v.1 Design SLAB Epoxy protection ? (cooling ?)
Heat shield: 100+400 µm
(copper)
Chip without packaging
6500 µm
PCB: 800 µm
glue: 100 µm
(needs tests)
wafer: 300 µm
ground foil:
100 µm
Main ISSUES :
Front End chips inside :
 Thermal dissipation (cooling ?)
 Chip behaviour in an electron shower
Long structure :
 Design and fabrication problems (composite with
segmentation of W plates, mechanical behaviour
…)
 Segmentation of PCB (design of an
interconnection)
Diminution of the pads size
 Increases of the number of channels (thermal
cooling ?)

v.2 Design SLAB
Size of glue dots
What are we up to?
• Aim to build a big chunk of detector in Manchester
when the time comes
• Currently concentrating on 2 areas
– DAQ (Marc & Richard)
– Mechanical assembly (Ray & Co.)
• Also starting to use the tier 2 for simulation and
(hopefully) data storage so we can do testbeam
analysis here too
What I have been up to
• Mostly doing the admin and getting things sorted
out!
• Slowly changing the priorities of the mechanical
side to get more involved with the EUDET (FP6
ILC detector/testbeam infrastructure development
at DESY)
• Trying to use the grid to do something useful
(failed miserably so far)
• Thinking about how to take a significant chunk of
the DAQ activity off the current incumbents…