Cross-talk in the TPC

1
Cross-talk in the TPC

• Simulations some data

2

• Couplings
• pad-to-pad
• wire-to-wire
• channel-to-channel

3
Cross-talk unwanted correlations
4
ADC distribution the innermost row
5
Effect on the pad signal
1.5 wire-to-wire
1.5 channel-to-channel
6
Inner sector, first row
7
Results from cosmic run
Cross-talk 40 ADC counts
8
Track-finding efficiency
1.5 wire-to-wire 1.5 channel-to-channel
9
Resolutions
Without cross-talk With cross-talk
7.3 7.3
dPt/Pt (integrated over Pt) 1 1
d? 1.6 mrad 1.6 mrad
d? 1.1 mrad 1.1 mrad
0.4-0.5 GeV/c
10
Conclusions

• 3 cross-talk (1.51.5) does not affect
• the detector performance
• similar effects on the pad-signal seen in
• the cosmic data
• futher studies required, using the test chamber