Efficiency Analysis of HV-MAPS Prototypes
Jan Repenning for the Mu3e Collaboration
DPG Fühjahrstagung, T41: Detektoren und DAQ 1 March 10th, 2015
The Mu3e Detector
Requirements pixel detector:
Pixel size: 80µm x 80µm
Continuous readout frequency: 20 MHz Low material budget → 50µm thickness
Target Inner pixel layers
Scintillating fibres Recurl pixel layers
Scintillator tiles
μ Beam
High Voltage Monolithic Active Pixel Sensors
P-substrate N-well
Particle E field
Zero suppressed readout 8 bit timestamps
HV applied: 50 - 90 V Charge collection via drift
(I. Peric, P. Fischer et al., NIM A 582 (2007) 876)
Telescope Setup
4 layers of Mupix6 sensors Read out by two FPGAs
z x y
Telescope Setup
Beam Test at PSI
πM1 beamline 250 MeV π,µ, e
Test of Mupix6 prototype First test of our telescope with beam
∼100 kHz tracks
∼1 MHz hits per layer
Straight Track Fit
Simple straight track:
~x(z) =~x0+~a·z
~x: x and y position
~a: two dimensional slope
Loop over all possible hit combinations and fit tracks with 1 hit in each plane
∆t<250 ns Hot pixels removed
Residuals
Run number
360 380 400 420 440
Residuals y mean [um]
-30 -20 -10 0 10 20 30
Residuals in y for plane 0 Residuals in y for plane 1 Residuals in y for plane 2 Residuals in y for plane 3
Run number
360 380 400 420 440
RMS of residuals y mean [um]
0 10 20 30 40 50 60 70
RMS of residuals in y for plane 0 RMS of residuals in y for plane 1 RMS of residuals in y for plane 2 RMS of residuals in y for plane 3
Aligned to within 10µm
Tracking without DUT
Plane 0
Plane 2
Plane 3
Tracking without DUT
Plane 0
Plane 1
Plane 2
Plane 3
Efficiency Analysis
Columns
0 5 10 15 20 25 30
Rows
0 5 10 15 20 25 30 35
0 100 200 300 400 500 600 700 800 900 Matched Hits
Columns
0 5 10 15 20 25 30
Rows
0 5 10 15 20 25 30 35
0 100 200 300 400 500 600 700 800 900 Total Hits
/
Columns
0 5 10 15 20 25 30
Rows
0 5 10 15 20 25 30 35
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Efficiency
=
Efficiency Analysis
Columns
0 5 10 15 20 25 30
Rows
0 5 10 15 20 25 30 35
0 100 200 300 400 500 600 700 800 900 Matched Hits
Columns
0 5 10 15 20 25 30
Rows
0 5 10 15 20 25 30 35
0 100 200 300 400 500 600 700 800 900 Total Hits
/
Rows
15 20 25 30 35
0.3 0.4 0.5 0.6 0.7 0.8 0.9 Efficiency
=
Rows
15 20 25 30 35
0.3 0.4 0.5 0.6 0.7 0.8 0.9 Efficiency
High Voltage Scan
Threshold = 0.65 V
High voltage [-V]
0 10 20 30 40 50 60 70 80
Efficiency
0.3 0.4 0.5 0.6 0.7 0.8
Threshold Scan
HV = 60 V
Efficiency
0.2 0.4 0.6 0.8 1
Summary & Outlook
Achieved alignment to within 10µm Efficiency of Mupix6 determined to
> 94 %
Beam test at DESY last week:
settings closer to noise, tuned chips New prototype Mupix7
Various thicknesses
Backup Slides
Time Resolution
trigger_ts_s_diff
Entries 6910482
Mean 1.238
RMS 16.43
/ ndf
χ2 8741 / 17
Constant 3.257e+05 ± 2.058e+02
Mean -1.931 ± 0.005
Sigma 7.162 ± 0.006
-100 -50 0 50 100
0 50 100 150 200 250 300
103
× trigger_ts_s_diff
Entries 6910482
Mean 1.238
RMS 16.43
/ ndf
χ2 8741 / 17
Constant 3.257e+05 ± 2.058e+02
Mean -1.931 ± 0.005
Sigma 7.162 ± 0.006
Trigger TimeStamp Difference Distribution for Single Events
Signal Wave Form
0.8
MuPix4
Threshold Spannung [V]
0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2
Ezienz
0 0.2 0.4 0.6 0.8
Threshold Scan (HV=-70V, Suche in Spalten) 1
Residuals
Run number
360 380 400 420 440
Residuals x mean [um]
-30 -20 -10 0 10 20 30
Residuals in x for plane 0 Residuals in x for plane 1 Residuals in x for plane 2 Residuals in x for plane 3
Run number
360 380 400 420 440
Residuals y mean [um]
-30 -20 -10 0 10 20 30
Residuals in y for plane 0 Residuals in y for plane 1 Residuals in y for plane 2 Residuals in y for plane 3
RMS of residuals x mean [um]
10 20 30 40 50 60 70
RMS of residuals in x for plane 0 RMS of residuals in x for plane 1 RMS of residuals in x for plane 2 RMS of residuals in x for plane 3
RMS of residuals y mean [um]
10 20 30 40 50 60 70
RMS of residuals in y for plane 0 RMS of residuals in y for plane 1 RMS of residuals in y for plane 2 RMS of residuals in y for plane 3
