Test-beam Results for the CMS Forward Pixel Detector Carsten Rott Daniela Bortoletto, Gino Bolla, Amitava Roy Purdue University 28 April 2001
Jan 01, 2016
Test-beam Results for the CMS Forward Pixel
Detector
Carsten RottDaniela Bortoletto, Gino Bolla, Amitava Roy
Purdue University28 April 2001
Test-beam Results for the
CMS Forward Pixel Detector
Carsten RottDaniela Bortoletto
Gino BollaAmitava Roy
Purdue University
28 April 2001
Pixels/blade24 Blades/disk
The CMS Detector
APS 2001 C. Rott
51018.1
Barrel + Forward Pixel Disks
FPIX-Disk
The Pixel Detector
150m x m pixelthickness 270m 22x30 pixel array
rad. hard DMILL ROCVvdepl 160
APS 2001 C. Rott
Telescope
Beam
Si-Strips vertical
Si-Strips horizontal
Scint.Counters
X/Y-Fibers1mm Dia.few mm2
Extrapolated trackx= 2.0 my= 3.6 m
Pixel Detector and Repeater Card
APS 2001 C. Rott
• 250GeV/c pion beam• Repeater card can be rotated• Can trigger on region as . small as 1mm2
Charge sharing comparison
Charge sharing between rows (rotated by 20o)
Charge sharing between rows (not rotated)
150m
150 m
APS 2001 C. Rott
LC
L
RC
R
PHPH
PH
PHPH
PH
• PH is 12bit ADC value• Charge sharing is increased by rotating the sensor• Charge sharing can be used to improve the resolution
distribution
Position correction curve
APS 2001 C. Rott
RC
R
LC
L
PHPH
PH
PHPH
PH
is the difference of the fraction of charge deposited in the neighboring pixel
)(1
)( ydyWA
P)(W
A is a normalizationfactor
vs position (20o rotation angle)
mPxx hitpixelcorr 150)(
Resolution
Resolution in micron between rows (rotated by 20o)
Resolution in micron between rows (not rotated)
APS 2001 C. Rott
Resolution
APS 2001 C. Rott
00
rotation
200
rotation
Highest resolution for large charge sharing and hits in between pixel
Signal height:
Noise:
Signal to noiseratio of 60
S/N and Efficiency
APS 2001 C. Rott
An absolute efficiency could not bemeasured because of a time stamp problem.A strong correlation between trackedposition and pixel hit position, suggestshigh efficiency.
ADCS 550
ADC3.9