1. Fwd EMC Crystals Geometry
C. Cecchi, S. Germani, P. Lubrano
INFN Perugia
12/12/2007

2. Rmin = R = 596.6
Rmax = R = 958.6
R due to TOF = 100*sin(22.7) = 38.6

3. Method Take first ring outer radius = Rmax
Take 240 crystals for first (closest to Barrel) ring
Calculate crystal size assuming regular polygon with inscribed circle of radius
Calculate next ring outer radius
Inside Same Module
Calculate crystal size to have same number of crystals
New Module
Calculate closest size to 25 mm to have number of crystals divisible by 5
Iterate until inner ring radius <= Rmin

4. Rmin = 596.6 =============================== 5x5 Modules
Ring Rmax Rmin N Side
Rmin = 596.6

5. Rmin = 596.6 =============================== 5x1 Modules
Ring Rmax Rmin N Side
Rmin = 596.6

6. Rmin = 596.6 ==============================
5x1 Modules decreasing size
Ring Rmax Rmin N Side
Rmin = 596.6

7. Conclusions Explored module configurations
5x1 decreasing crystal size
Should we explore 5xN (1<N<5) ?
Can check with MC if trend exists
5x1 configurations
we can approximate size to have higher number of identical crystals (across more than one ring) and check with MC if increased dead space affect resolution