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Transcript
TRD-prototype test at KEK-FTBL 11/29/07~12/6 The TRD prototype is borrowed from GSI group (thanks Anton). Univ. of Tsukuba Hiroki Yokoyama 1 KEK-FTBL • KEK, Fuji Test Beam Line • 2007/11/29-12/6 • 3GeV/c,electron beam Beam Area 2 TRD-prototype 3 setup Scintillation Counter TRD MRPC Trig for TOF PbGlass 4 measurement • Pad Response Function • Amplification of signals (through anode voltage and gas dependence) • Electron attachment (through drift voltage dependence) • Drift velocity (through drift voltage and gas dependence) • Absorption of TR-photon(absorption length in 2type gases, Ar+CO2(85,15),Xe+CO2(85,15)) • Angle dependence of position resolution Pad Response Function • distance from CM vs. proportion of induced charge to sum of them. • Full width of signal sharing in azimuthal direction is 3pads. Pulse height is defined as sum of three adjacent pad’s induced charges. 6 Mean pulse height Ar+CO2(85,15) time Xe+CO2(85,15) Drift Voltage -2100V Anode Voltage 1500V 1450V 1400V 1350V 1300V time Anode voltage vs pulse height Ar+CO2(85,15) Xe+CO2(85,15) Pulse height at Amp region Mean pulse height Gas Gain Gas gain by avalanche can be fitted by exponential function of anode voltage Anode voltage 7 Drift velocity Xe+CO2(85,15) Mean pulse height Mean pulse height Ar+CO2(85,15) time Anode Voltage 1500V Drift Voltage -2100V -2000V -1900V -1800V -1700V time Electric field vs Drift velocity Drift Velocity Ar+CO2(85,15) Xe+CO2(85,15) Drift velocity for Ar gas is about three times larger than that for Xe gas Electric Field of Drift region 8 Electron attachment a/b is defined as sign of electron attachment. Attenuation of signal by electron attachment b a a/b Ar+CO2(85,15) Xe+CO2(85,15) Stay time of electron The attenuation of signal by H2O or oxygen depends on time that 9 electrons stay in the chamber. TR-photon signal(1) •Correct time distribution to be flat shape in the drift region Xe+CO2(85,15) before after Anode Voltage 1500V Drift Voltage -2100V With Radiator Without Radiator time time Ar+CO2(85,15) after before 10 time time TR-photon signal(2) •Calculate the TR photon contribution as the difference between time distributions with/without radiator. •By slope of exponential fit, I calculated absorption length of TR-photon in each gas. TR-photon attachment absorption length 89mm(in Ar) 10mm(in Xe) Ar+CO2(85,15) Xe+CO2(85,15) Depth of detector from drift electrode(mm) Depth of TRD-prototype is 30mm. 95%(in Xe),28%(in Ar) TR-photon energy is absorbed. 11 Calculate center time Pad number resolution in azumuthal direction time Data for fit Angle=20° angle 1pad(=8mm) resolution 0° 391±10μm 10° 605±28μm 20° 1071±22μm 30° 1614±45μm Measure difference between this point and fited line Resolution(angle 0°)is about 400μm 12 summary • Signal share is less than 3 pads. • Gas gain by avalanche can be fitted by exponential function of anode voltage. • Drift velocity in Ar gas is about three times larger than that in Xe gas. • The attenuation of signal by hydrogen and oxygen depends on time that electrons stay in the chamber. • absorption length in Xe(Ar) is 10mm(89mm) • Resolution(angle 0°) is 391μm. 13