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ECAL days, 17 June 2014 Andrea Benaglia – SPACAL results SPACAL with SiO 2 :Ce

ECAL days, 17 June 2014 Andrea Benaglia – SPACAL results SPACAL with SiO 2 :Ce. Moliere radius versus fraction of Tungsten in Cu-W alloy. Current EE PbWO 4 R M = 2.2 cm. 3D W printing??. Colours: correspond to different fiber diameters Different points: different fiber spacing.

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ECAL days, 17 June 2014 Andrea Benaglia – SPACAL results SPACAL with SiO 2 :Ce

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  1. ECAL days, 17 June 2014 Andrea Benaglia – SPACAL results SPACAL with SiO2:Ce Moliere radius versus fraction of Tungsten in Cu-W alloy Current EE PbWO4 RM = 2.2 cm 3D W printing?? Colours: correspond to different fiber diameters Different points: different fiber spacing

  2. Radiation length versus fraction of Tungsten in Cu-W alloy SPACAL with SiO2:Ce Current EE PbWO4 Xo = 0.9 cm 3D W printing?? Colours: correspond to different fiber diameters Different points: different fiber spacing

  3. Moliere radius versus fibre spacing for 25%Cu-75%W SPACAL with SiO2:Ce Current EE PbWO4 RM = 2.2 cm Optimal geometry Fiber diameter: 0.8mm--‐1mm Distance: 1.4--‐1.6mm Can read off the fibre distances used in the simulation

  4. Radiation length versus fibre spacing for 25% Cu - 75% W SPACAL with SiO2:Ce Current EE PbWO4 Xo = 0.9 cm Optimal geometry Fiber diameter: 0.8mm--‐1mm Distance: 1.4--‐1.6mm

  5. Resolution versus fibre spacing for 25% Cu - 75% W SPACAL with SiO2:Ce Resolution at 1 GeV Current EE PbWO4 Resolution 20% at 1 GeV (stoch only ??) Optimal geometry Fiber diameter: 0.8mm--‐1mm Distance: 1.4--‐1.6mm

  6. Resolution, SPACAL with SiO2:Ce 25% Cu – 75% W Fiberdiameter 1.0 mm Fiber spacing 1.6 mm Fiberdiameter 0.8 mm Fiber spacing 1.4 mm Inputs: SiO2:Ce Light Yield = 103 photons/MeV Inputs: Efficiency = 0.01

  7. Some SPACAL numbers of interest to extract: • Energy lost in liquid scintillator • Photons emitted by liquid scintillator ‘at source’ • Photons lost by exiting capillary to metal surround • Photons exiting capillary at end (other end mirrored, not mirrored) • Photons exiting capillary at end (other end mirrored, not mirrored) • per unit of deposited energy, as a function of z

  8. SPACAL design considerations: • What is actual resolution target in CMS ? • We have learnt that a significant amount of resolution is • lost due to the upstream tracker material budget • Further deterioration due to pile-up • No point in “over” design • Cost • Time • Complexity • No return • Irrespective of the physics targets, can we set an upper resolution limit using the upstream tracker material as the limiter alone ??? • Need full CMS SIM to study this with a ‘final’ tracker geometry. Take the current tracker for now ???

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