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CALs distances IMPORTANT NOTE:

1. Consider that each CsI crystal has a wrapper around 0.75mm thick.

This wrapper thickness must be subtracted to have the exact distances.

Hext (CsI layer height)=21.34mm

Hint (CsI crystal height)=19.9mm

DH=Hext - Hint=1.44mm --> wrapper thickness=0.72mm

2. At each CsI crystal end there are both gap and endcap.
The gap+endcap length is around 6mm (the length is variable reffering to NLR drawings, link below)

Lext (CsI layer length)=338mm

Lint (CsI crystal length)=226mm

DL=Lext - Lint=12mm --> gap+endcap length=6mm