TIB module performance at X5 Test beam – preliminary studies G.Segneri et al. Universita` and INFN - Pisa Test Beam meeting – October 23 2003

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

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, 15 -120 GeV m TIB dec.: 30020, 24, 27, 33, 36, 39, 42, 46 – 120 GeV p, 25 ns beam

Beam Position in TIB Modules muon beam pion beam

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

TIB Voltage scan – peak (II)

TIB Voltage scan – dec.

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

Response Function

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

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

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

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

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

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

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

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

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

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 1351-3: peak mode, pion beam, approx. 500,000 events Run 1484: dec mode, 25 ns pion beam, approx. 1,500,000 events

Groups of 16 strips

Groups of 8 strips Groups of 16 strips

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…