1. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Central Muon Scintillators Steven Doulas D0 Muon Upgrade Group Northeastern University

2. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Group Effort D. Hedin, S. Dychkant –NIU V. Bodyagin –Moscow State U. H. Mao –China L1Muon- K.Johns, R. McCroskey, J. Temple –Arizona U. T. Diehl, A. Ito, L. Stutte, M. Zanabria –FNAL A. Bannanjes, S. Bheesette, S. Dugad, N. Mondal –Tata Institute

3. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas L1MUO Singles Rate Collisions No Collisions A-layer (all Octs.) ~158kHz A-layer (all Octs.) ~69 kHz

4. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas L1Muo Singles Rate Collisions C-layer (all Octs.) ~1.15 MHz No Collisions C-layer (all Octs.) ~1.07 MHz

5. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas L1Muo Singles Rate D0 Luminosity = 2.9E30 Beam Energy = 978.5 GeV CollisionsNo Collisions

6. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Why? And how to fix this. Activated ceiling w/~1MeV gamma –Need to determine how close to MIP in order to discriminate. –Correct thresholds must be set without cutting into efficiency. Possible Solutions –Shielding During the Supervised Access, planning to add Pb on C-layer counters and measure rates, etc.. –Must take PMT calibration runs using LED Pulser We have PMTCALIB package to determine gain and p.e.’s. Adjust thresholds and possibly HV as necessary.

7. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas PMTCALIB Gaussian Fit to LED Signal in a typical C-layer PMT.

8. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Gain Measurements Calculated PMT Gain for different LED light intensities (overall range is a factor 2)

9. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Photoelectron Yield Photoelectron estimates as a function of PMT Voltage for counters on PDT243

10. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas D0ve-Muon Event Display

11. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas D0ve-Muon Event Display

12. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas D0ve-Muon Event Display

13. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Central Muon Trigger (A.C)

14. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Central Muon Trigger (A.C)

15. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Central Muon Trigger (A.C)

16. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas CM(A.C) + L1Cal 5GeV Jet

17. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas CM (A.C) + L1Cal 5GeV Jet

18. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas CM (A.C) + L1Cal 5 GeV Jet

19. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas CM (A.C) + L1Cal 5Gev Jet

20. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas CM (A.C) + L1Cal 5GeV Jet

21. 11 September 2001D0 Collaboration Meeting Data Analysis Jamboree S.Doulas Goal: A Central Muon Scintillator(only) Trigger In Summary –Shielding –Collecting and analyzing raw data + calibration data. Use L1Muo + CalJet trigger to set muon timing in counters. –Future w/PDT segments Thresholds, HV, etc.. –Adjust Beam Delay then position + reduce central scintillator trigger gate. Add TOF gate