To have an idea of the effort, consider that in the HPC there are 144 modules,
mostly containing 16 "accordeons" having
a linear length of about 25 m. Each "accordeon" has 60 lead wires, glued with a
inter-wire gap of 200 microns. For a correct behavior none of those modules
is allowed to show more than a few short circuits: this means 1 s.c./10 km.
Genova was the only collaborating lab to produce full modules (read-out chambers
and trigger scintillators not included).
To control the dead region around 90°, a system of lead-scintillator
counters was also realized in Genova.
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