1. TIB module performance at X5 Test beam – preliminary studies
G.Segneri et al.
Universita` and INFN - Pisa
Test Beam meeting – October

2. Outline Detector behavior under different bias voltages
Studies on Detector Response Uniformity

3. Voltage scan for TIB Detectors
Study of the detector properties (noise, charge, S/N, cluster width and response function) as a function of the applied voltage
Used runs:
TIB peak: 1198, 99, 1202, 03, 04, 14, GeV m
TIB dec.: 30020, 24, 27, 33, 36, 39, 42, 46 – 120 GeV p, 25 ns beam

4. Beam Position in TIB Modules
muon beam
pion beam

5. TIB Voltage scan -peak
Peculiar behaviour at 300 V – hysteresis effect?

6. TIB Voltage scan – peak (II)

7. TIB Voltage scan – dec.

8. TIB Voltage scan – dec. (II)
20% increase in S/N ratio for Vbias = 2Vfd

9. Response Function

10. Cluster Shape Dec. mode Vbias=200V Peak mode Vbias=200V Peak mode

11. TIB Voltage scan under controlled environmental conditions
p beam
T<23 oC
Run numbers:
T<23 oC: 30133, 37, 40, 42, 45, 47, 50
R.H.<20%: 30154, (62-66), (69-74)
120 GeV muon beam

12. TIB Voltage scan under controlled environmental conditions (II)
Performance reproducible under controlled RH condition
signal and noise depend on RH but not their ratio

13. Voltage Scan for TOB Detectors
Used runs: 30145, 47, 51, 63, 64, 65 – 120 GeV m, 25 ns beam – deconvolution mode

14. TOB mod # 7
TOB mod # 8
TOB mod # 9
TOB mod # 10
TOB mod # 11
TOB mod # 12

15. TOB Voltage scan Noise constant above 200 V
Charge collection improvement at very high voltage

16. TOB module voltage scan (II)
25% decrease in S/N for Vbias = Vfd

17. TOB module voltage scan (III)
Less 10% of charge loss at Vbias/Vdepl>1.5
Constant cluster width above Vbias=300 V

18. Comparison TIB/TOB
95% of S/N highest value at 1.7 (1.5) Vdepl for TOB (TIB) modules

19. Sensor Uniformity Studies
Study of the TIB sensor properties (noise, charge, S/N, respone function) as a function of the cluster position
Used runs:
Run : peak mode, pion beam, approx. 500,000 events
Run 1484: dec mode, 25 ns pion beam, approx. 1,500,000 events

20. Groups of 16 strips

21. Groups of 8 strips
Groups of 16 strips

23. Conclusions TIB and TOB modules behave as expected except
in some runs to be understood
Dependence on RH to be investigated more deeply (next talk?)
Uniformity of detector performance as a function of the position was successfully tested in high statistics runs
Work still in progress…