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Published byLorin Austin Modified over 9 years ago
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A Study of Time over Threshold (TOT) Technique for Plastic Scintillator Counter 高能物理研究所 吴金杰
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Outline Introduction Research method-wave analysis Signal characteristics Relative charge resolution by TOT Summary
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Introduction to TOT (1) TOT-Time Over Threshold Pulse width TOT is somewhat dependent the charge Different threshold Advantage: One of alternatives to charge measurement Simplify the electronics Reduce the cost Time over threshold
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Introduction to TOT (2) Apply in gas detectors Multi-gap Resistive Plate Chamber of ALICE and STAR: NINO-Correction of front edge time walk Drift Chamber of CLEO-III: Relative charge resolution: 10% TOT for Plastic scintillator counter? The correlation between TOT and Charge? Relative charge resolution? Relative Charge resolution of CLEO TOT versus measured time
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Research method-wave analysis To be measure TOT, Amplitude, Charge How? Chip? Based on CAMAC system? Wave analysis Using high quality oscilloscope sample rate 20 GS/s TOF module Scintillator EJ200 +R5924 Experimental setup
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Pedestal, Noise, Rise time The data within the first 250 ns are noise without any particle passing through the scintillator counter Noise: 2.0 mV Pedestal: 2.2 mV Rise time:4.2ns A wave shape of pulse The noise spectrum Spectrum of rise time Reference to the design BESIII TOF electronics
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Amplitude, Charge Spectrum of amplitude Spectrum of charge Charge versus amplitude The charge is obtained from the time integral of the current pulse
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Distribution of TOT The distribution of TOT when the threshold is set to 65 mV 15% of the most probable value of amplitude The distribution of TOT when the threshold is set to 195 mV 45% of the most probable value of amplitude The distribution of TOT with different threshold
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TOT VS Charge--threshold 65mV The relative charge resolution versus charge TOT versus charge Linear correlation between TOT and charge Relative charge resolution can reach 7%-18% when the threshold is set to 65mV The relative error of Q by TOT can be obtained by formula
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TOT VS Charge--threshold 195mV The relative charge resolution versus charge TOT versus charge The correlation between TOT and charge Relative charge resolution can reach 4%-7% when the threshold is set to 195mV
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Summary A Study of TOT technique for Scintillator counter firstly Wave analysis The Characteristics of TOF module Pedestal, Noise, Amplitude, Charge, Rise time Relative charge resolution From 7% to 18% (Threshold is set to 65mv) From 4% to 7% ( Threshold is set to 195mv)
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