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AMS Software Review ACC Analysis

AMS Software Review ACC Analysis. Ch Chung, A. Goerres, Th. Kirn I. Phys. Institute B, KSC, 31st January 2011. 2010 August Testbeam → ACC Inefficiency Studies. Beam. Rotation stand. 2010 August Testbeam Configuration. 180 GeV proton-beam Ø beamspot: ~ 3 cm. particle. particle. 3. 4.

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AMS Software Review ACC Analysis

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  1. AMS Software Review ACCAnalysis Ch Chung, A. Goerres, Th. KirnI. Phys. Institute B,KSC, 31st January 2011

  2. 2010 August Testbeam → ACC Inefficiency Studies Beam Rotation stand

  3. 2010 August Testbeam Configuration 180 GeV proton-beam Ø beamspot: ~ 3 cm particle particle 3 4 4 positions for ACC-test (1) panel (8mm thickness), exchanged PMT (3) slit region (2x4mm thickness), shared PMT (2) panel (8mm thickness), original PMT (4) slit region (2x4mm thickness), separate PMT

  4. Event Selection Requirements: - Trigger from Upper TOF - Single reconstructed TRD-Track - TRD-Track matching beam config. - matching TOF-hit positions

  5. TOF-hit matching TRD track good event TRD track – center of TOF panel

  6. Event Selection Requirements: - Trigger from Upper TOF - Single reconstructed TRD-Track - TRD-Track matching beam config. - matching TOF-hit positions

  7. Event Selection Requirements: 7.661.060 - Trigger from Upper TOF 5.310.522 - Single reconstructed TRD-Track 2.994.861 - TRD-Track matching beam config. 705.926 - matching TOF-hit positions 528.643

  8. Inefficiency (only TRD-Track) P1 P2 P3 P4 Missed Events Panel (8 mm thickness) (P1, P2): 0 out of 259,245 → I < 1.16·10-5 Slit region (2x4mm thickness), shared PMT (P3): 0 out of 125,010 → I < 2.40·10-5 Slit region (2x4mm thickness), different PMT (P4): 1 out of 144,268 → I < 4.00·10-5 8mm panel region: ~73% slit region: ~27% ~6cm ACC inefficiency: I < 6.00 · 10-6 (@ 95% CL) requirement: Idesign < 10-4

  9. Event Selection using Tracker Requirements: - Trigger from Upper TOF - Single reconstructed TRD-Track - TRD-Track matching beam config. - matching TOF-hit positions - Tracker information Tracker information (3 Tracker-layers below TRD)

  10. Event Selection Requirements: 7661060 - Trigger from Upper TOF 5310522 - Single reconstructed TRD-Track 2994861 - TRD-Track matching beam config. 705926 - matching TOF-hit positions 528643 - min. 2 matching TrCluster-hits on first 3 layers below TRD 415966 - linear fit / check for chi² 324826 - track predicts ACC-hit 322884 322,884 events after all cuts

  11. Matching Tracker-hits TrCluster: - distance from all Cluster-hits to extrapol. TRD-track - x & y coordinate of nearest hit is within TRD-track- uncertainty (~1cm)

  12. Matching Tracker-hits multiplicity • TrCluster: • distance from all • Cluster-hits (incl. • multiplicity) to • extrapol. TRD-track • x & y coordinate of • nearest hit is • within TRD-track- • uncertainty (~1cm)

  13. Fit Quality of Tracker track • min. 2 matching hits on 3 Tracker-layers below TRD • fit linear Track through points, not including bending in y-direction • check for chi²

  14. Inefficiency Dimensions panel width: 22 cm beamspot Ø: 3 cm Slit region (nut & spring) width of slit region between panel: 0.6 cm Missed Events and Inefficiency Panel (8 mm thickness): 1 out of 304,022 → I < 1.90·10-5 Slit region (2x4mm thickness), shared PMT: 0 out of 9,450 → I < 3.17·10-4 Slit region (2x4 mm thickness), different PMT: 0 out of 9,412 → I < 3.18·10-4

  15. Inefficiency Dimensions panel width: 22 cm beamspot Ø: 3 cm Slit region (nut & spring) width of slit region between panel: 0.6 cm Inefficiencies Panel (8 mm thickness): I < 1.90·10-5 Slit region (2x4mm thickness), shared PMT: I < 3.17·10-4 Slit region (2x4mm thickness), different PMT: I < 3.18·10-4 ~97% ~3% of total scintillator-area single inefficiencies weighted corresponding to area ACC Inefficiency: I < 1.89 · 10-5 (@ 95% CL) requirement: Idesign < 10-4

  16. ADC-Spectra for 180 GeV p-Beam Typical ADC-spectra as input for MC-studies

  17. TDC-Spectra for 180 GeV p-Beam Typical ADC-spectra as input for MC-studies

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