- Vertex is at (0,0,0)
- Total sum energy and No clustering
- To be compared with
the last page of these slides
- Unexpected valley at ~1/3 of full energy
- Unex[ecyed strong peak at ~2/3 of full energy
- Test beam data, and my expectaton, is very broad peak at ~1/3 of energy, and keep falling towards full energy
- Test beam data from Oleg for 4GeV pion, whiere 4GeV electron peak is at 435ch
- Hit map weigthted by enery deposit for a ring of pi- with R=50-60cm at Z=350 for checking encodinga/decoding hits - Looks good
- Checking if materials in front (unlikely), or Hcal directly behind with no space giving back-flash, causing this - Nope.
2GeV 5GeV 10GeV 20GeV 40GeV 80GeV 
- GEANT4 Material Scan
- 10.15g/cm^3 (X0~26 Lambda=1.2~1.4) seems a bit high. Oleg says its old measurement with Chinese W powder we will not use.
- 9.50g/cm^3 (X0~24 Lambda=1.1~1.3) is what Oleg suggests for more rearistic number
- W poweder and scintillator fibers with BirksConsttant=0.126*mm/MeV
material
average densityRadiation Length Interaction Length
(1tick=1.0)Mixed 10.15 g/cm^3 
Mixed 9.50 g/cm^3 
W powder + ScFi 
- Changing material density and GEANT geometry model (homogenious mixed material vs W powder + actual 760 fibers)
2GeV 5GeV 10GeV 20GeV 40GeV 80GeV 
