AMS Software Review ACC Analysis Ch Chung, A. Goerres, Th. Kirn I. Phys. Institute B, KSC, 31st January 2011.

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Presentation transcript:

AMS Software Review ACC Analysis Ch Chung, A. Goerres, Th. Kirn I. Phys. Institute B, KSC, 31st January 2011

August Testbeam → ACC Inefficiency Studies Beam Rotation stand

August Testbeam Configuration 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 180 GeV proton-beam Ø beamspot: ~ 3 cm particle 4 3

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 TRD track – center of TOF panel good event

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

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

8 Inefficiency (only TRD-Track) ACC inefficiency: I < 6.00 · % CL) requirement: Idesign < 10-4 Missed Events Panel (8 mm thickness) (P1, P2): 0 out of259,245 → I < 1.16·10 -5 Slit region (2x4mm thickness), shared PMT (P3): 0 out of125,010 → I < 2.40·10 -5 Slit region (2x4mm thickness), different PMT (P4): 1 out of144,268 → I < 4.00·10 -5 ~6cm P4P1P2P3 8mm panel region: ~73% slit region: ~27%

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

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

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

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 Dimensions panel width:22 cm beamspot Ø: 3 cm Slit region (nut & spring) width of slit region between panel: 0.6 cm Inefficiency Missed Events and Inefficiency Panel (8 mm thickness): 1 out of304,022 → 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 ~97% ~3% of total scintillator-area ACC Inefficiency: I < 1.89 · % CL) requirement: Idesign < 10-4 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 single inefficiencies weighted corresponding to area Dimensions panel width:22 cm beamspot Ø: 3 cm Slit region (nut & spring) width of slit region between panel: 0.6 cm Inefficiency

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