Drift Chamber Analysis

1
Drift Chamber Analysis
Review Meeting
Presented by Matthias Schneebeli
2
Waveforms
anode (U)
anode (D)
vernier (0)
vernier (1)
vernier (3)
vernier (2)
3
Noise

• Fast oscillation
• Coming from voltage supply

• Slow oscillation
• Under investigation

-gt Both types of noise can be reproduced in the
Lab
4
Peak Finder I

• Algorithm developed for waveforms from the
  trigger-board
• Waveform smearing
• Peak search by investigating the derivation
• Baseline determination between two peaks

5
Peak Finder II - Baseline
Baseline Maximum in the amplitude distribution
6
Peak Finder II

• Criteria for a peak
• Large moving average (10) gt threshold
• Veto
• Small moving average (4) lt threshold
• PeakWidth lt PeakWidthMin
• Pile Up
• Derivation changed from neg. to pos.

Peak selection TAnode-U -TAnode-D lt Tmin
7
Anode Current
The anode current has been monitored during the
whole beam time
8
Number of Peaks
DATA RUN156163 FS41100 (25
intensity) primary proton 1.4mA DAQ pre-scale
10 of trigger 10k
MC RUNCONFIG 1 (RUN2006) event mode 30
(muon) of generation 1M
-gt Very rough normalization -gt No efficiencies
included
9
Number of Peaks II
Similar result obtained by a completely
independent analysis
10
Muon Rate
Muon rate can be reproduced with DC data
Normalized at 100 the maximum intensity
11
Timing
-gt We see a correlation with the trigger
12
Cathode Asymmetry
FS41 250
FS41 100
13
Anode Asymmetry
MC Use z-coordinate
Data Use Anode asymmetry