how to trigger to test mdt with cosmic rays? authors
TRANSCRIPT
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How to trigger to test MDT with How to trigger to test MDT with cosmic rays?cosmic rays?
authors
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• Trigger rate (f ) limited by the DAQ system to about 300 Hz
• Time encoding programmable window (T ) varied between 2 s and 35 s
• Cosmic rays rate (r ):
• If rT <<1 and 700 ns << T << 1/f
• Number of events in a time interval t with a two multilayer track:
N=rTf t =300 s-1 · T(s) ·10-6 s · 300 s-1 · t(h) · 3600 h = 324 T(s) t(h) ev/h
Hzrssteradmd
d
dddd
dr
BIL
MDT
300~70
cos
112
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Test in the lab.
Trigger:
1. Cosmic trigger. RPC hodoscope (t0’s and trigger time available)
2. Random (time unit pulser)
2 BIL chambers (144+144 tubes)
Standard threshold. (Noise level? plot)
Data collection: cut on word count corresponding to 2 hits in the event.
Analysis:
- Standard reconstruction for cosmics using all available information from the trigger
- Track reconstruction for random trigger samples: event by event fit of t0
- Track reconstruction of cosmic samples with t0 fit (for comparison)
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Hit multiplicity
Random triggerEncoding window = 2.2 s
Recorded events (at least 2 hit in the event required)
Number of hits in ML1 vs Number of hits in ML2 in one chamber
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Tracking Alghoritm
Track fit and t0 determination:
1) Correct all the drift times with respect to the smallest
tidrift= ti
drift - tmindrift
2) Iterative search of the best time to add to the measurements to minimize chi2
Calibration of the rt relation required but... (forthcoming slides)
Tube track (pattern recognition): find at least 6 tubes aligned on a possible straight track.
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Panettone standard su autotrigger
Spettro tdc standard su autotrigger
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autocal autotrig
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autocalautotrig
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Comparison trigger- no trigger Check (cosmic trigger file)drift time diff theta diff
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Plot chi2, pchi2
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Random triggerChanging time encoding window
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Panettone autotrigger (diverso da quello con trigger rpc?)
Panettone con hit on pattern vs panettone con hit on track
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Window (s) n. Pattern per h n. Tracks per h foreseen cosmics per h
2.2 750
3.2 970
6.4 1900
12.8 3990
25.6 7182
rATLAS << r Rome Reduction factor 30
fATLAS >> f Rome Rome daq rate 300 Hz
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