study of position sensitive silicon detector (psd)
TRANSCRIPT
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Study of Position Sensitive Silicon Detector (PSD)
Yuto Uesugi
Ryosuke Mori , Hiroaki Yamashiro , Taikan Suehara
Tamaki Yoshioka , Kiyotomo Kawagoe
Kyushu University
2019/11/26
CHEF2019, Calorimetry for the High Energy Frontier 2019
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ILD (International Large Detector)
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ILD (International Large Detector)
• gg
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tracker
calorimeter
Solenoid magnet
Return yoke&muon tracker
beam
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SiWECAL
• Si detection layer+W absorption layer multilayer structure (20~30 layer)
• Sandwich ASIC and PCB between detection and absorption layer
• W Electromagnetic shower
• Measure the energy of photons
• g in jets mostly comes from 𝜋0 via 𝜋0 → 2𝛾 decay
• For accuracy of 𝜋0 reconstruction, direction of photons (angular resolution) is important information
high position resolution sensor
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• Divide the signal in the resistive surface layer
• Hit position can be obtained as the gravity center of signal strengths of the electrodes
• With PSDs the position resolution can be improved with minimum increase in the acquisition channels
PSD (Position Sensitive Silicon Detector )
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E
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Previous study
- Distortion at the edge
- Range is small 𝑥 axis : 0.33/7000mm 𝑦 axis : 0.34/7000mm
- Due to DAQ problem, not measured in the Test beam
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• Irradiate the laser to PSD (7×7mm2) at 500 µm intervals and get signals from electrodes at the four corners
Real injection pointReconstruction point
X cordinate Y cordinate
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New specification for PSD
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• Small dynamic range Effect of readout impedance Increased resistance of the resistive layer
• Previous PSD • Improved PSD
E E
P+ mesh P+ dot
Resistive layer
Signal charge passes through P+ layer
Resistance value is controlled by mesh shape it is necessary to remake mask to change it
P + is placed on the dot transport the signal charge through
the upper resistive layer. The resistance value can be set
higher and can be changed without changing the mask.
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New specification for PSD 1-a
• Cell size : 5.5×5.5 mm2
• Sensor thickness : 650 µm
• Three resistance values are available:10 times, 20 times, and 30 times the previous PSD in order to optimize the resistance value of the resistance layer
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PSD 1
PSD 1×16 = 64ch
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New specification for PSD 1-b
• Cell size : 5.5×5.5 mm2
• Sensor thickness : 650 µm
• Three resistance values are available:10 times, 20 times, and 30 times the previous PSD
• Arrange low resistance lines at the cell edges to reduce distortion
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PSD 1Low resistance line1/4 times and 1/8 times the center plane resistance
PSD 1×16 = 64ch
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New specification for PSD 2
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PSD 2
usual Si sensor4×4 cell
PSD 1 2×2 cellpixel size : 2 times
• Share adjacent cell pads
• Suppress increase in readout channel
• Multiple resistance values available
• If the number of read channels is the same, the pixel size can be reduced.
• Example:16×16 cells PSD 1 cell size is 11mm (2 times)PSD 2 cell size is 5.86mm(16/15 times)
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New specification for PSD 2
• Share adjacent cell pads
• Suppress increase in readout channel
• Multiple resistance values available
• If the number of read channels is the same, the pixel size can be reduced.
• Example:16×16 cells PSD 1 cell size is 11mm (2 times)PSD 2 cell size is 5.86mm(16/15 times)
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PSD 2
usual Si sensor4×4 cell
PSD 2 3×3 cellpixel size : 4/3 times
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New daughter board and connector
• designed for connecting to the ASIC evaluation board through new connector
• PCB with 4 layer
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Test board for SKIROC
CHEF2019, Calorimetry for the High Energy Frontier 2019
Daughter board for PSD
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New board design of PSD 1
• New design daughter board using CADENCE allegroPSD 1 PCB with hole for irradiating the PSD with laser
PSD 1 without hole for measurement with radio isotope or for test beam
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Sensor gluing
• Conductive bonding glue
• Dispenser made by Musashi Engineering (ML-808GX)
• High precision desktop operating type robot (SHOTMASTER400ΩX)
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Sensor gluing
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Sensor gluing
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Test beam measurement
• Place: ELPH (Tohoku University)
• 560 MeV positron beam
• Program1. Measure position resolution
2. Measurement of position distortion
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Setup
PMT and scintillator
beam
LGAD sensor daughter board
PSD and testboard
test board for LGAD
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Test beam measurement
• So far, the noise was so loud that I couldn't see the signal with the self-trigger.
• Measured by triggering with PMT and scintillator
• The signal is probably visible.
• We will analyze from now on.
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ADC count on each channel
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Summary and prospect
• For γ reconstruction, it is important for sensor to have high position resolution.
• PSD methods avoids an increase in the number of readout channels.
• Glued the sensor to the PCB
• Test beam measurement was performed at ELPH.
• To be doneLaser measurementAnalysis of test beam dataProduction of PSDs designed to be mounted on ILC prototype
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Back up
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SKIROC analog
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High voltage board design
• HV pad
• LEMO
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Solder capacitor and LEMO connector
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New board design of PSD 2
• PSD2 PCB with hole
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PSD 2Two resistance patterntotal 30ch
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• PSD2 without hole
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Sensor gluing
• It’s right after applying conductive bonding glue .
• I left a weight for several days.
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