1. Jin Huang Los Alamos National Lab

2.  Cited from March collaboration Meeting EC group Internal Communication Jin Huang 2 Preshower ID power drop significantly at this bin

3. Cutting 2cm away on 1st baffle inner radius Received background simulation from Zhiwen on May 24 EC group Internal Communication Jin Huang 3

4. EC group Internal Communication Jin Huang 4 Electron (mostly absorbed in Pb) Pion- Pion+ 3 rd Update New 4 th Update

5. 3 rd Update New: 4 th Update EC group Internal Communication Jin Huang 5 Direct Pi 0 γ Soft EM γ Photon (EM) <- dominant! Photon (Pi 0 ) Electron Pion- Pion+ Proton Improve by two-fold

6. Pion Efficiency Electron Efficiency 6 Improvement Update

7. Pion Efficiency Electron Efficiency 7 Outer radius, higher γ φ-band, full bgd Middle radius, higer γ φ-band, full bgd, full bgd 100% pass for ~250 events/bin Physics

8. Pion Efficiency Electron Efficiency 8 Middle radius, higher γ φ-band, full bgd Inner radius, higer γ φ-band, full bgd

9. EC group Internal Communication Jin Huang 9 High radiation phi slice Low radiation phi slice Improvement

10. Received background simulation from Zhiwen on May 19 Running background imbedding EC group Internal Communication Jin Huang 10

11. High radiation azimuthal region Low radiation azimuthal region EC group Internal Communication Jin Huang 11 Direct Pi 0 γ Soft EM γ Photon (EM) <- dominant! Photon (Pi 0 ) Electron Pion- Pion+ Proton from 2 nd update

12. EC group Internal Communication Jin Huang 12 Photon (6GHz/6+1 Hex cluster) Electron Pion- Pion+ Proton

13. EC group Internal Communication Jin Huang 13 Electron (mostly absorbed in Pb) Pion- Pion+ + 6 GHz photon not shown (3GHz for lower φ-radiation )

14. Pion Efficiency Electron Efficiency 14 Outer radius, higher γ φ-band Outer radius, lower γ φ-band Due to Soft EM γ

15. Pion Efficiency Electron Efficiency 15 Outer radius, higher γ φ-band Mid radius, higher γ φ-band Due to Hadron rate

16. Pion Efficiency Electron Efficiency EC group Internal Communication Jin Huang 16

17. Pion Efficiency Electron Efficiency 17 Inner radius, higher γ φ-band Inner radius, lower γ φ-band

18. Pion Efficiency Electron Efficiency 18 Inner radius, higher γ φ-band, full bgd Middle radius, higer γ φ-band, full bgd, full bgd 100% pass for ~250 events/bin Physics

19. Pion Efficiency Electron Efficiency 19 Middle radius, higher γ φ-band, full bgd Outer radius, higer γ φ-band, full bgd

20. Pion Efficiency Electron Efficiency EC group Internal Communication Jin Huang 20

21. EC group Internal Communication Jin Huang 21 High radiation phi slice Low radiation phi slice

22. Reported May 7 Calorimeter Meeting EC group Internal Communication Jin Huang 22

23. Pion Efficiency Electron Efficiency 23 Outer radius, higher γ φ-band Mid radius, higher γ φ-band

24. Pion Efficiency Electron Efficiency 24 Inner radius, higher γ φ-band Inner radius, lower γ φ-band

25. Hex 1+6 Shower Trigger > 1.6GeV (for 2GeV electron) + Preshower Pad on top of central shower block > MIP + 1σ EC group Internal Communication Jin Huang 25 + Preshower -> x2 improve

26. Pion Efficiency Electron Efficiency 26 Middle radius, higher γ φ-band Inner radius, higher γ φ-band Electron > 2GeV

27.  Look at single Hexagon shower blocks which passed 0.75 MIP cut. ◦ Full background spectrum used ◦ ADC integration window = 50ns  ~10% blocks will produce a 0.75MIP signal for clock trigger ◦ Data readout is least 10% of modules ◦ A shower MIP trigger is likely just trigger on lower energy particles EC group Internal Communication Jin Huang 27 higher γ φ-band lower γ φ-band

28.  Radiation on preshower is high for PVDIS ◦ Last meeting we showed that preshower will show radiation damage in a few months run in PVDIS configuration (assuming no cure for photon bgd) ◦ Estimated light loss is a fraction depending on the choice of scintillator and fibers  Our preshower was designed to produce high photon yield ◦ Scint. thickness = 2cm with WLS imbedding ◦ Expected photon / MIP = 140 e γ ◦ After 50% radiation damage (70 e γ ), MIP resolution from photon fluctuation = 12% ◦ Intrinsic fluctuation on MIP sampling = 23%, PID cut on MIP + 2.5 σ ◦ Therefore, effect on radiation damage to MIP resolution is expected to be minimal, as long as we calibrate the photon yield online EC group Internal Communication Jin Huang 28 Beam test for LHCb pad (1.5cm thick) From LHCb technical design report

29. Reported Apr 30 Calorimeter Meeting EC group Internal Communication Jin Huang 29

30. High radiation azimuthal region Low radiation azimuthal region EC group Internal Communication Jin Huang 30 Direct Pi 0 γ Soft EM γ Photon (EM) <- dominant! Photon (Pi 0 ) Electron Pion- Pion+

31. EC group Internal Communication Jin Huang 31 Photon (7 GHz/6+1 Hex cluster!) Electron Pion- Pion+

32. EC group Internal Communication Jin Huang 32

33. EC group Internal Communication Jin Huang 33

34. EC group Internal Communication Jin Huang 34

35. EC group Internal Communication Jin Huang 35 w/ photon, w/ pi+, Outer R, High Rad phi slice w/ photon, w/ pi+, Outer R, Low Rad phi slice w/ o photon, w/ pi+, Inner R, High Rad phi slicew/ o photon, w/ pi+, Inner R, Low Rad phi slice

36. Reported Apr 23 Calorimeter Meeting EC group Internal Communication Jin Huang 36

37. EC group Internal Communication Jin Huang 37 Photon Electron Pion- Pion+

38. EC group Internal Communication Jin Huang 38 Electron Pion- Pion+ Lower pi- rate in new simulation

39. EC group Internal Communication Jin Huang 39 p>2GeV Not much change in electron eff.

40. EC group Internal Communication Jin Huang 40 p>2GeV x2 improved from last version

41. EC group Internal Communication Jin Huang 41

42. Internal Discussion Jin Huang, et. al.42 Layer #1 is 2cm preshower scint. From Dec Collaboration Meeting

43. Internal Discussion Jin Huang, et. al.43 Layer #1 is 2cm preshower scint. From Dec Collaboration Meeting

44. EC group Internal Communication Jin Huang 44

45. EC group Internal Communication Jin Huang 45 Photon Electron Pion- Pion+

46. EC group Internal Communication Jin Huang 46 Electron Pion- Pion+ High pi+ rate?? Need to be checked High pi+ rate?? Need to be checked

47. EC group Internal Communication Jin Huang 47 Background pile ups

48. EC group Internal Communication Jin Huang 48 Significant drop in rejection

49.  Position or kinematic dependent trigger threshold and cut threshold  Use track multiplicity to assist calorimeter cuts EC group Internal Communication Jin Huang 49