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TIB module performance at X5 Test beam – preliminary
studies
G.Segneri et al.Universita` and INFN - Pisa
Test Beam meeting – October 23 2003
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Outline
• Detector behavior under different bias voltages
• Studies on Detector Response Uniformity
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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 TIB dec.: 30020, 24, 27, 33, 36, 39, 42, 46 – 120 GeV , 25 ns beam
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Beam Position in TIB Modules
muon beam pion beam
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TIB Voltage scan -peak
• Peculiar behaviour at 300 V – hysteresis effect?
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TIB Voltage scan – peak (II)
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TIB Voltage scan – dec.
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TIB Voltage scan – dec. (II)
20% increase in S/N ratio for Vbias = 2Vfd
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Response Function
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Cluster ShapePeak modeVbias=200V
Dec. modeVbias=200V
Peak modeVbias=450V
Dec. modeVbias=450V
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TIB Voltage scan under controlled environmental
conditionsRun numbers:T<23 oC: 30133, 37, 40,
42, 45, 47, 50R.H.<20%: 30154, (62-
66), (69-74)
120 GeV muon beam
beamT<23 oC
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Performance reproducible under controlled RH condition signal and noise depend on RH but not their ratio
TIB Voltage scan under controlled environmental
conditions (II)
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Voltage Scan for TOB Detectors
Used runs: 30145, 47, 51, 63, 64, 65 – 120 GeV , 25 ns beam – deconvolution mode
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TOB mod # 7 TOB mod # 8
TOB mod # 12TOB mod # 11
TOB mod # 10TOB mod # 9
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TOB Voltage scan
Noise constant above 200 V Charge collection improvement at very high voltage
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TOB module voltage scan (II)
25% decrease in S/N for Vbias = Vfd
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TOB module voltage scan (III)
Less 10% of charge loss at Vbias/Vdepl>1.5 Constant cluster width above Vbias=300 V
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Comparison TIB/TOB
95% of S/N highest value at 1.7 (1.5) Vdepl for TOB (TIB) modules
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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
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Groups of 16 strips
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Groups of 8 strips Groups of 16 strips
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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…