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Published byElwin Bond Modified over 9 years ago
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Report on CMS 3D sensor tests Enver Alagoz 1 On behalf of CMS 3D collaboration 1 Physics Department, Purdue University, West Lafayette, IN 47907- 2036 US 26 April 2012
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Pre- and post-irradiation lab and beam tests (@ FNAL) performed for SINTEF and FBK 3D sensors – CNM sensors only tested in testbeams Irradiation – 800 MeV protons/cm 2 at Los Alamos – Fluences: 3.5E14, 0.7E15, and 3.5E15 n eq /cm 2 All ROCs work after irradiation – Except SINTEF case: 1 out of 6 ROCs worked Post-irradiation lab measurements carried out in the thermal chamber – Leakage current – Noise – Source data Introduction
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Cold setup Purdue cold test setup Environmental chamber -35 °C < T < 200 °C Humidity control Works with CAPTAN and PSI DAQ systems Good for sensor IV measurements and ROC calibrations at cold Manual temperature control Cold setup for irradiated 3D sensor testing
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Cold setup Purdue cold test setup Sr-90 source Linear actuator Sensor HV Temperature sensor
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Thermal measurements in the chamber Purdue cold test setup Infrared camera placed in the chamber to measure the sensor temperature Thermal image of sensor at emissivity = 1 Thermal chamber at 10 °C
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Thermal measurements in the chamber Thermal chamber at 10 °C ROC is ON --- temperature sensor pcb ROC is OFF ΔT = 13 °C
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FBK 3D PIXEL SENSORS
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Sensors Full 3D 200 μm thickness ATLAS08 batch (2010) Sensor ROC Bump bonds VHDI Base plate Adhesive Wire bond Bias wire FBK 3D plaquette
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IV measurements Thermal chamber at -20 °C
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Noise scan Thermal chamber at -20 °C
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Source testing Sr-90 source: 1 mCi, E β = 0.546 ΜeV Random trigger used Thermal chamber at -20 °C 1 Vcal = 65 e- MP = 10.6 ke- (Thickness: 200 μm) 4E_14_W8 @ -15V Φ = 1E15 p/cm 2
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Source charge collection scan Sr-90 source: 1 mCi, E β = 0.546 ΜeV Random trigger used Landau convoluted Gaussian fit Thermal chamber at -20 °C 4E_14_W8 @ -15V Φ = 1E15 p/cm 2
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Charge collection scans Thermal chamber at -20 °C
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Source testing: pre- and post-irradiation Signal LOSS: 1E 43% after 1E15 p/cm 2 (0.7E15 n eq /cm 2 ) 1E 50% after 5E15 p/cm 2 (3.5E15 n eq /cm 2 ) 2E 14% after 1E15 p/cm 2 (0.7E15 n eq /cm 2 ) 4E 14% after 1E15 p/cm 2 (0.7E15 n eq /cm 2 )
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Beam test results (1E_2) V bias = -15V : 20 o tilt Preliminary Beam spot 98.5% efficiency 62% size 1 pixel 37% size 2 pixels Unirradiated sensor
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Beam test results (2E_9) V bias = -5V : 20 o tilt Preliminary Beam spot 94.6% efficiency 77% size 1 pixel 22% size 2 pixels Unirradiated sensor
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SINTEF 3D PIXEL SENSORS
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Sensors Plastic protection Cooling tubes SINTEF 3D plaquette 2E Configuration 4E Configuration n+ (readout)p+ (bias) 100 μm 150 μm
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SINTEF 3D Plaquette Al fixture VHDI Adhesive ROC Sensor Bump bonds Support wafer HV bias wirebond Au plated Ceramic Bias pad
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Chamber @ -20 °C Sensor: 4E_B2-10_1 ϕ = 1E15 n eq /cm 2 Noise scan
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V bias = -90V Thickness = 200 µm MPV = 9600 electrons Chamber @ -20 °C Sensor: 4E_B2-10_1 ϕ = 1E15 n eq /cm 2 Sr-90 source: 1 mCi, E β = 0.546 ΜeV Random trigger used Charge collection
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Chamber @ -20 °C Sensor: 4E type 200 μm thick ϕ = 1E15 n eq /cm 2 Charge collection scan
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CNM 3D PIXEL SENSORS
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CNM 3D sensors Columns etched from opposite sides of substrate Columns don't pass through full thickness 1E type only Hole aspect ratio 25:1 10µm diameter, 250µm deep P- and N-type substrates, 285µm thick Giulio Pellegrini et al (CNM)
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Beam test results (12-3_62A) V bias = -15V : 0 o tilt Preliminary Beam spot 93.4% efficiency 99% size 1 pixel 1% size 2 pixels Unirradiated sensor Sensor: 1E type 200 μm thick
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Summary & Outlook All irradiated ROCs work (CNM, FBK) except SINTEF Lab measurements performed in the thermal chamber at -20 °C Thermal measurements suggest sensor temperature is -7 °C (ROC ON) when thermal chamber at -20 °C due to ΔT = 13 °C IV, noise scan, and source testing done – Negligible increase in noise – Leakage current increased – Not much increase in depletion voltage Post- and post-irradiation beam test results will be ready in few months More 3D sensors will be irradiated with fluences up to 1E16 n eq /cm 2 Search for a testbeam facility since FNAL will have no beam for sometime starting from May 2012
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BACKUP SLIDES
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BEAM CONTROL ROOM DUT PIXEL DETECTORS SCINTILLATORS 3.7V POWER SUPPLY ACELLERATOR CLOCK CLOCK AND TRIGGER DISTRIBUTION FNAL testbeam 120 GeV protons No B field Meson Area
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FNAL testbeam layout
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