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Recent works on AMS TANG Zhi-Cheng
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Outline Detector overview Proton measurement
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Detector overview to check and monitor the situation and performance of AMS detector from fly data Based on statistics of detector hit distribution and reco object distribution Run automatically at CERN LSF
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Accumulate data plots daily data rate accumulate events number
daily event number
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AMS fly overview Live time No. of events Fly time
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Hits distribution of sub-detectors(1)
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Hits distribution of sub-detectors(2)
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Ecal reconstruction objects
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Event count distributions of reco particles R > 20 GeV
Particle direction (galactic coordinate) AMS position (geographic coordinate)
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Proton spectrum: first try
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Measurement schema data exposure time &event selection: selection
reco spetrum data selection efficiency: reco spectrum unfolding incident spectrum geometry factor proton spectrum
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Event selection proton trigger path particle reconstruction selection
bit2 || bit5 ( FTC+Anti || FTC+FTE ) particle reconstruction selection 1 particle with track beta>0 && charge=1 track selection event.ntrk=1 layer8 && layer9 nhitY>=5 && nhitXY>=4 NoMSchi2 < *ln(R) nTofCluster=4
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Geomagnetic cut and livetime
cutoff=1.2×15 ×cos4(thetaM) adjust according to binning ignore events below cutoff reduce exposure time for rigidity below cutoff Live time Exposure time
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Preliminary Spectrum Selected Events Proton Event rate
Momentum distribution Proton Event rate Futher works includes efficiency, geometry factor, and unfolding
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Thanks
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