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Update on RICH Upgrade Simulations

Update on RICH Upgrade Simulations. RICH Upgrade meeting. S.Easo , 16-10-2012. Outline. Feasibility of the two-RICH option for upgrade. Last meeting:. Results from using current optics / ‘modified optics’ for RICH1

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Update on RICH Upgrade Simulations

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  1. Update on RICH Upgrade Simulations RICH Upgrade meeting S.Easo, 16-10-2012

  2. Outline • Feasibility of the two-RICH option for upgrade. • Last meeting: • Results from using current optics / ‘modified optics’ for RICH1 • ‘Modified optics’ suffered PID performance loss due to acceptance effects • although it reduced the peak occupancy by 50%. • This presentation: • Further modifications to the RICH1 optics to avoid acceptance effects • Comparison of PID performances • Plans

  3. Optics Modifications • Spherical mirror ROC= 2710 3800 mm (same as version2) • Spherical mirror tilt = 240 mrad (current optics ~ 315 mrad, version2 ~ 200 mrad) • Flat mirror: • mirror segment sizes increased by 30%, • but kept the same location for edge nearest to the beampipe as in version2. • Photodetector planes tilted accordingly. Mean=38 mrad • PMT modules 5 rows7 rows • in each panel of RICH1. Photon: angle of incidence on PMT plane. Optics-Version3

  4. RICH1 Optics Optics-Version3

  5. RICH1 – Optics verifications Optics-Version3 Particle Gun at 280 310 mrad

  6. RICH1 Optics Verifications Optics-Version3 Particle gun at 25  35 mrad

  7. RICH1 Optics verifications Cherenkov angle reconstructed in Particle gun events Width=0.72 mrad RICH1 yield Mean=36 Optics Version3

  8. Datasets and simulation options • Gauss v42r1, Brunel v44r0 • All PMT data with SBA-Borosilicate version of PMTs. • All data without Aerogel • Signal events of Bs  ff for PID studies • About 20 K events used for each option

  9. PID performance at Lumi2 Current-Optics RICH1-Optics-Version3 This version of ‘new optics’ has better performance compared to ‘current optics’.

  10. PID performance at Lumi20 Current-Optics RICH1-Optics-Version3 This new optics has better performance.

  11. PID comparisons Performance loss due to Lumi2 Lumi20 is mostly recovered by improved optics. (ie.‘Red ’ marginally below the ‘black ’ ).

  12. PID vs. Momentum Lumi2-S, Current optics dll_K >0.0 dll_K > 4.0 MeV MeV dll_K > 0.0 dll_K >4.0 MeV MeV K K efficiency p misID probability Lumi20-S, Current Optics

  13. PID vs. Momentum Lumi2-S, RICH1-Optics-Version3 dll_K >0.0 dll_K > 4.0 dll_K >0.0 dll_K > 4.0 Lumi20-S, RICH1-Optics-Version3

  14. Epilogue • The number of PMTS 1920 2688 in RICH1 • 2688= 12*7*2*16 • Possibilities to reduce this: • (a) Have a sparse distribution of PMTs near the outer edges of the • acceptance. May be tried to to see the effect on PID • (b) Limit the acceptance to a smaller value. • Rotating RICH1 : Not done yet. • Number of scintillation hits in RICH2 : to be improved.

  15. Summary • Improvements in the optics configuration resulted in improving the PID • performance. • Possibilities exist for further improvements in PID performance • and to reduce the number of PMTS used.

  16. BACKUP SLIDES

  17. PID vs Angle Current Optics RICH1-Optics-Version3 Lumi2-S 9.3GeV<P < 30 GeV mrad mrad 9.3GeV<P < 30 GeV 9.3GeV<P < 30 GeV mrad mrad K K efficiency p misID probability Lumi20-S In all plots dll_K > 4.0

  18. RICH1-Optics-Version3

  19. Resolutions from Brunel RICH1-Optics-Version3

  20. Track Parameters PT P MeV MeV Tracks used in RICH PID algorithm Track polar angle Lumi2-S Current-Optics mrad

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