W. Clarida, HCAL Meeting, Fermilab Oct. 06 Quartz Plate Calorimeter Prototype Geant4 Simulation Progress W. Clarida The University of Iowa

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Outline Introduction First simulation model, and results Realistic simulation model, and results Future work

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Introduction While working on the “HE Upgrade (Quartz Plate) R&D” we started to plan a Quartz Plate Calorimeter Prototype. First studies were Geant4 simulations of an approximate model calorimeter. As the R&D results shaped the ideas we started to design and simulate the prototype. QPCAL has partially tested at Feb 06 Fermilab test beam, then full calorimeter (20 layers) tested for 66GeV and 120GeV protons on Sept 06 test beam. In Nov we have CERN test beam that will cover pion and electron beams All these tests have to be simulated as well. As realistic as possible. This is ongoing project.

W. Clarida, HCAL Meeting, Fermilab Oct st Gen. Model Quartz Plate Prototype A matrix of 3x3 towers with alternating 4.5 mm Cu and 0.5 mm Quartz plates is constructed. (30cm x 30cm x 100 cm) To study detector geometry optimization. Geant4 read-out studies.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Shower Development 1 Electromagnetic and hadronic shower developments were simulated with electron and pion beams at different energies.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Energy Resolution & Linearity The energy resolution and linearity were calculated for different beam energies.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 The Prototype Design R&D results and initial model shaped the prototype. The final design: –20cm x 20cm, 20 layers 70 mm iron, 5 mm quartz

W. Clarida, HCAL Meeting, Fermilab Oct. 06 The Fiber Geometry We used the bar geometry on the prototype. The fibers in the actual prototype are 1mm diameter Bicron wavelength shifting fibers. They absorb photons down to 280 nm, emit 435 nm. Currently however the simulation uses HE fibers. The fibers go ~20 cm out of the quartz.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Shower Development 2 Simulations of shower development in our present prototype. This will be compared to the Pion and Electron test beam at CERN Pion test beam will be with 7cm absorber. Electron will be with 2cm absorber. (currently being simulated)

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Shower Development Simulations of proton shower development in our present prototype. 5cm absorber as this is what is supplied at Fermilab. Must still increase statistics.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Geant4 Simulations of Prototype These simulations still need to be improved. We need more energies of the different particles as well as more statistics of the present energies. Also the current fibers are not the fibers that will be used in the final design. Geant4 simulation of 2 GeV electron with our current configuration of 70mm iron absorber, 5 mm quartz plate prototype calorimeter.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Energy Resolution Hadrons The energy resolution of the different simulated beam energies. Typical simulated signal distribution

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Energy Resolution Electrons The energy resolution is simulated with different beam energies. Only 7cm simulations. Typical simulated signal distribution

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Detector Linearity The detectors linearity is from the same beam energies. Again 7cm absorber thickness for Pions and 5cm for Protons. This graph also suffers from a lack energy range in the simulations. Electron Linearity for 7cm Absorber depth.

W. Clarida, HCAL Meeting, Fermilab Oct. 06 Plans Use our CPU time: –Increase statistics of current energies. –Fill in gaps and extend the range to complete energy resolution. –Complete electron simulations for thinner absorber. –Compare signal creation in the quartz to signal received by the PMTs. –Look at the transverse shower profiles to make sure that all of the Cerenkov signal is being contained. Tweak our simulation: –Improve the description of the fibers to reflect the entire absorption range. –Make Tyvek reflectivity more realistic with wavelength dependant reflectivity –Create a simulation with scintillator to compare to test beam and quartz simulations –Use different physics packages.