slide 1
sCVD Diamond for the CMS Pixel Detector
sCVD Diamond for the CMS Pixel Detector
14--15 May 2004
R.Stone, RutgersJ.Doroshenko, L.Perera, S.Schnetzer
RD42 Collaboration Meeting
• Overview of CMS Pixels• Testing Starting min-Aug. at CERN SPS• Testing at FNAL Q4 2004• Summary
Vers 1.2
slide 2
CMS Pixel Detector
Total 70M Pixels
10-20 thousand cm2 of active sensors
slide 3
CERN SPS Testbeams:
Aug 04, Oct 04• Piggy-back on PSI-Zurich testbeam telescope and analysis
• Sensor only test: PSI30 readout chip in “transparent” mode– Pixel size: 125x125 microns– Edge-on or Vertical orientation to beam– In 3Tesla field to study Lorenz drift
• Use sCVD diamond and compare to equiv. silicon detectors
• Need ~2 ‘small’ sCVD diamond pieces > 3x5 cm2:– Aug. test un-irradiated sensors– Sep. irradiate sensors– Oct test irradiated sensors
slide 4
Beam, Magnetic field
Trigger PIN diode(3x6mm)
Pixel Array (22x32) of 125mx125m one pixel size
X4,Y4 plane (50m)
X3,Y3 plane (50m)
X2,Y2 plane (50m)
X1,Y1 plane(m)
Beam telescope and pixel setup view.
The Test Beam Setup
slide 5
The test beam setupBeam telescope and pixel installed between two Helmholtz coils, maximum magnetic field 3T, and pixel is cooled down by Peltier cooler.
slide 6
CERN H2 SPS Test Beam Measurements
1. 900 between pixel plane and the beam, no magnetic filed, to study charge collection efficiency, signal, noise;
2. 150 between pixel plane and beam, no magnetic filed to study depletion depth, trapping effects, also for alignment for the Lorentz angle measurements;
3. 150 between pixel plane and beam, 3T magnetic filed to study Lorentz angle
slide 7
Fermilab Testbeam Fall 04
• Use final version of readout chip: PSI46
• Test of pixel detector: Sensor and readout chip together– Pixel size: 100x150 microns– Irradiated vs non-irradiated detectors: Silicon and Diamond– Rutgers telescope: 1 micron extrapolated track resolution – 1-2 KHz DAQ rate (but spill is 0.7s every 60s!)
• Use sCVD diamond and compare to equiv. Silicon detectors
– Hit efficiency– Position Resolution– Threshold minimization
• Need 1 or 2 sCVD diamond pieces 1 cm2
slide 8
Cosmo - Hardware: PSI 46
slide 9
Cosmo Pixel GUI
slide 10
Cosmo DAC screen
slide 11
Cosmo ADC Tool
slide 12
Testbeam Run Control Gui
slide 13
FNAL Testbeam DAQ Overview
slide 14
PSI 43 Calibration Analysis
Gain Histogram
0
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10 60 110 160 210 260 310 360 410
Gain (ADC Counts/10000 electrons)
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Pedestals
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1470 1520 1570 1620 1670 1720 1770
Pedestal (ADC Counts)
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Threshold
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1000 2000 3000 4000 5000 6000 7000 8000 9000
Threshold (# of electrons)
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33B Chip0 Vcal run
1 6 00
1 7 00
1 8 00
1 9 00
2 0 00
2 1 00
2 2 00
2 3 00
slide 15
IZM 34B chip0 (1x2) at T=-20C
Thresh, Pedestal, Gain Address levels, Charge
Pulser Calibration analysis
slide 16
Summary
• Two testbeam oportunities in the coming months:– CERN SPS: Diamond vs Silicon sensor comparison
• Lorentz angel
• Resolution
• Signal / Noise
– FNAL: Sensor + Final Readout chip • Hit Efficiency / Threshold
• Resolution
• Need 2 smaller sCVD for CERN (small ROC), • 1-2 larger pieces for FNAL (final ROC)
