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Enhancing the CDF Muon Upgrade with Scintillation Counters for Improved Performance

Learn about the upgrade objectives of scintillation counters in the CDF Muon Upgrade, covering design, performance, and refurbishment. Explore the role of these counters in increasing muon trigger efficiency and reducing background noise in data analysis.

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Enhancing the CDF Muon Upgrade with Scintillation Counters for Improved Performance

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  1. Scintillation counters for the CDF Muon Upgrade DPF 2000, Columbus Ohio G. Pauletta, for the CDF Collaboration • Outline: • Overview • upgrade objectives and the role of the scintillation counters • The Run I counters • Characteristics, performance and problems • Filling the holes and extending the coverage: New counters • design and performance • Refurbishing old counters • method and results

  2. Muon Upgrade objectives • Trigger on muons at increased luminosity ( >1032) and shorter bunch crossings (396 ns, 132 ns) • Increase coverage RUN I -------- > RUN II CMU CMP/CSP CMX/CSX BMU/BSU Coverage 0<h<0.6 0<h<0.6 0.6<h<1 1<h<1.5 drift time 800 ns 1.4 ms 1.4 ms 800 ns

  3. The muon trigger scintillation ctrs. serve to “time stamp” and/or reduce uncorrelated b.g. at level 1

  4. Muon Upgrade subdetectors Intermediate Muon BMU + BSU + TSU (new) Central Muon eXtension (CSX + CMX) CentralMuon uPgrade (CSP + CMP) (new) (old) Central Muon chambers “miniskirt” (new) lower 90o

  5. Old counter design PVT - base scintillator (NE114) CSPs 30 cm 3 m long EMI 9815 PMT 2 cm thick CSX “minskirt counter” ~ 2m CSX “arch” counters ~ 2 m

  6. New counter design Scintillator: UPS-923A from Monokristal, Kharkov, Ukraine. Polystyrene doped with PTP(2%) and POPOP(.03%) Wls fiber: double - clad Y11 fiber from Kuraray fiber “mirrored at far end. Hamamatsu H5783 photomultiplier + Cockroft - walton base Ctr. type number dimensions CSP 150 320cm x 30.5cm x 2 cm BSU 432 164 cm x 17 cm x 1.5 cm

  7. Counter readout Wls fiber PAD

  8. New counter assembly LED LED PAD

  9. Counter output calibration Each counter output is calibrated in absolute terms (number of photoelectrons/ADC channel) by exposing it to low - level pulsed light ( ~1 p.e./pulse) and locating the centroid single p.e. distribution.

  10. Counter response ( in photoelectrons) to cosmic muons is measured in steps of ~20 cm and the results are fitted to extract counter characteristics Measurements are automated (4 ctrs at a time) npe Offline fit distance (x) from pmt From the fit , one extracts: n0 (zero extrapolation) r (reflection coefficient of fiber mirrors) keeping known fiber attenuation constant at 3 m npe(x) = n0(exp(-x/l) + r * exp(-(2L -x)/l))

  11. Counter parameters and test results using cosmic muons

  12. Problems with “Old” counters: efficiencies were lower than expected CSP efficiencies CSX efficiencies time dependence evident

  13. Attenuation - length for good an bad counters Or LED Response to cosmic muons confirms degradation in attenuation-length and reveals a corresponding degradation in light yield

  14. We unwrap some counters Most of the counters display pronounced aging effects Good NE114 Bad NE114

  15. Old Counter refurbishment: wls fiber ribbon addes to one side and routed to existing pmt

  16. CSP Repair: Work at Lab 5

  17. Distributions of fixed counter outputs Average npe = 16 p.e. Average npe = 58 p.e.

  18. Muon Upgrade objectives • Trigger on muons at increased luminosity ( >1032) and shorter bunch crossings (396 ns, 132 ns) • Increase coverage RUN I -------- > RUN II CMU CMP/CSP CMX/CSX BMU/BSU Coverage 0<h<0.6 0<h<0.6 0.6<h<1 1<h<1.5 drift time 800 ns 1.4 ms 1.4 ms 800 ns

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