The MuPix 7

Testbeam Characterization of the MuPix7

Lennart Huth BTTB Workshop 2016

03 February 2016

Motivation

What’s beyond the SM?

Charged Lepton Flavour Violation?

Introduced by BSM theories Measurable branching ratios predicted

The decayµ⁺→e⁺e⁻e⁺ SM - BR < 10⁻54 P~p =0

Coincident in space and time Emax < 53 MeV

Background

Radiative decay with internal conversion: P

~p 6=0

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Mu3e

The Mu3e Experiment - Searching forµ⁺→e⁺e⁻e⁺ with a sensitivity of BR<10⁻¹⁶

Inner pixel layers

Scintillating

Outer pixel layers Recurl pixel layers

Scintillator tiles

μBeam Stopping Target

fibres

Multiple scattering regime and high rate→ Fast and thin pixel sensor

HighVoltage - MonolithicActivePixelSensors (HV-MAPS)

(I.Peric, P. Fischer et al., NIM A 582 (2007) 876 )

Design Goals Binary readout

Pixel size: 80 x 80 µm² 256 x 256 pixel

Time resolution < 20 ns Efficiency > 99 %

50 µm thin≈ 0,05 % radiation length

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The MuPix 7

Latest prototype

Fully integrated readout on the chip On chip PLL & VCO

1.25 GBit/s data ≈33 MHits/s

The MuPix Telescope

Idea: Build a tracking detector out of Mu3e parts as integration test and fill a gap in the choice of existing beam telescopes:

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Mechanics, Readout & DAQ

Custom PCB holder with 10µm precision

Commercial mechanical support Readout and data transfer - next talk by Dorothea

Versatile graphical control interface Online monitoring, tracking and efficiency calculation

Mechanics, Readout & DAQ

Custom PCB holder with 10µm precision

Commercial mechanical support

Readout and data transfer - next talk by Dorothea

Versatile graphical control interface Online monitoring, tracking and efficiency calculation

200-260mm

max. 600 mm min 25 mm

breadboard

rail MuPix Beam

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Mechanics, Readout & DAQ

Custom PCB holder with 10µm precision

Commercial mechanical support Readout and data transfer - next talk by Dorothea

Versatile graphical control interface Online monitoring, tracking and efficiency calculation

Mechanics, Readout & DAQ

Custom PCB holder with 10µm precision

Commercial mechanical support Readout and data transfer - next talk by Dorothea

Versatile graphical control interface

Online monitoring, tracking and efficiency calculation

03/02/16 MuPix Testbeams Lennart Huth 7

Mechanics, Readout & DAQ

Custom PCB holder with 10µm precision

Commercial mechanical support Readout and data transfer - next talk by Dorothea

Versatile graphical control interface Online monitoring, tracking and efficiency calculation

Time stamp correlation

Column correlations

Analysis Concept

Analysis Procedure

Align the system Extrapolate track and check hits on DUT Match DUT hits Analyze cut-effects Extract the relevant

parameters ^{0 100 200 300} Matching Radius [mum]^{400 500}

Efficiency of ROI

0.88 0.9 0.92 0.94 0.96 0.98 1 1.02

Chi2 Cuts 1 2 4 6 8 10 14 20

Efficiency for different chi2 cuts as function of the matching radius

Efficiency Analysis

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

0 100 200 300 400 500 600 Matched Map

# Matched

/

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

# Tracks

0 100 200 300 400 500 600 Track Map

=

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Efficiency Analysis

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

0 100 200 300 400 500 600 Matched Map

# Matched

/

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

# Tracks

0 100 200 300 400 500 600 Track Map

=

Eff = ^{# matched}_{# tracks}

Row

0 5 10 15 20 25 30 35

0.80.82 0.840.86 0.880.9 0.920.94 0.96 Efficiency Map 0.98

Efficiency

Efficiency Analysis

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

0 100 200 300 400 500 600 Matched Map

# Matched

/

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

# Tracks

0 100 200 300 400 500 600 Track Map

=

Eff = ^{# matched}_{# tracks}

Column

0 5 10 15 20 25 30

Row

0 5 10 15 20 25 30 35

0.80.82 0.840.86 0.880.9 0.920.94 0.96 Efficiency Map 0.98

Efficiency

ROI ^{EffROI= # matched}# tracks_ROI^ROI

Noiseratepixel= ^#hits−_{# runtime}^{# matched}_{·# pixel}

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Testbeam Campaigns

SPS Testbeam

Goal:

Show functionality of MuPix7

Integrate it into the Telescope

Beam:

Pions 160 GeV

High intensity spills Setup:

4 planes MuPix7

0 5 10 15 20 25 30

0 5 10 15 20 25 30

35 pixel_map_3_

Entries 6751219

Mean x 20.57

Mean y 23.66

RMS x 5.293

RMS y 10.29

/ ndf χ2 8.93e+04 / 1115

Constant 1.698e+04 ± 10.64 MeanX 20.97 ± 0.002603 SigmaX 5.732 ± 0.002219 MeanY 33.14 ± 0.03305 SigmaY 19.04 ± 0.02497

pixel_map_3_

Entries 6751219

Mean x 20.57

Mean y 23.66

RMS x 5.293

RMS y 10.29

/ ndf χ2 8.93e+04 / 1115

Constant 1.698e+04 ± 10.64 MeanX 20.97 ± 0.002603 SigmaX 5.732 ± 0.002219 MeanY 33.14 ± 0.03305 SigmaY 19.04 ± 0.02497

pixel map for sensor 3_

Result

Efficiency probably limited by saturated DAQ during spills!

Threshold [V]

0.73 0.735 0.74 0.745 0.75 0.755 0.76

Efficiency

0.955 0.96 0.965 0.97 0.975 0.98 0.985 0.99

98 %

Edges excluded Edges included

Legend

Noise Rate

edges excluded edges included

Threshold [V]

Noiserate per pixel [1/s]

0 5 10 15 20 25 30 35 40 45

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PSI Testbeam

Goals: Measure Efficiency Noise

Compare different power settings

Time resolution Beam:

Positrons, muons, pions

≈220 MeV/c

Trigger rate< 2 MHz On sensor rate 380 kHz

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Time Resolution

Selected only events with reference scintillator coincidence

Required time resolution

< 20 ns

Measured in a separate setup - no tracking information

30 40 50 60 70 80

0 2000 4000 6000 8000 10000 12000

Trigger TimeStamp Difference Distribution for Single Events

σ = 11 ns

Counts [1/run]

Time difference [16 ns]

0 50 100 150 200 250

0 10 20 30 40 50 60 70 80 90 ToTtime Trigger Difference versus ToT

ToT [10ns]

PSI 2014 data

Comparision of Power Settings

maximal cooling power: 400 mW/cm²

Threshold [V]

0.7 0.71 0.72 0.73 0.74 0.75 0.76 0.77 0.78

Efficiency

0.75 0.8 0.85 0.9 0.95 1

High Power Settings Medium Power Settings Low-Medium Power Settings Low Power Settings

1W/cm^2 400 mW/cm^2 300 mW/cm^2 225 mW/cm^2

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DESY Testbeam

Goals: Measure Efficiency Noise Cross talk Sub pixel effects Beam:

Positrons 4-6 GeV/c Rate <10 kHz Setup:

Rotated device under test DMA and GPU tests 2nd telescope for long term stability measurements

0 1 = DUT 2 3

Beam

6cm 2cm 6cm

α

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Crosstalk I

Selection Criteria Single track

Count hits on DUT

Select events with only 2/3 hits Same column, row +/-2

Column/Row Address

0 5 10 15 20 25 30 35

Crosstalk Prob

−4 10

−3 10

−2 10

triple_hit_row

row col

Crosstalk II

Column/Row Address

0 5 10 15 20 25 30 35

Crosstalk Prob

−4 10

−3 10

−2 10

triple_hit_row

row col

Active Pixel Area

Digital Part

Point to Point

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Crosstalk III

Crosstalk Prob

−3 10

−2 10

triple_hit_row

row col

Crosstalk III

Column/Row Address

0 5 10 15 20 25 30 35

Crosstalk Prob

−4 10

−3 10

−2 10

triple_hit_row

row col

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Efficiency Summary

Larger rotation→ more signal→ Higher efficiency at higher thresholds

0.94 0.95 0.96 0.97 0.98 0.99 1

Rotation 0o

15o

30o

45o

Efficiency

Conclusion

First running integrated HV-MAPS system High Rate capabilitiesO(1MHz)

Important tool to test scaling High system efficiency>99 % Time resolution < 11 ns

Cross talk and clustering analysis ongoing

→ cross talk issue, should be fixed in MuPix8

Threshold [V]

0.07 0.06 0.05 0.04 0.03 0.02

0.94 0.95 0.96 0.97 0.98 0.99 1

Rotation 0o 15o 30o 45o

Efficiency

Thanks to the Helmholtz alliance for providing beam time!

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Outlook

8 planes

Improve DUT integration

Use existing DAQ to develop module tests and readout Next prototype with a size of > 1 x 1 cm²

Better timing: timestamps created by faster clock

Backup

Track Model

Trackmodel:Straight track without scattering

~x(z) =x~₀+~a·z

→ X² can be analytically minimized X² =

n

X

i=1

(x_i−(x₀+a_x·z_i))²

σ_x²_mi +(yi −(y0+ay ·zi))² σ²_ymi

!

assumingσ_x/ymi =pixel resolution= pixel size√ 12

Alignment @ DESY

Run number

600 800 1000 1200 1400

Residuals x mean [um]

−15

−10

−5 0 5 10 15

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

600 800 1000 1200 1400

Residuals y mean [um]

−15

−10

−5 0 5 10 15

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

600 800 1000 1200 1400

RMS of residuals x mean [um]

20 30 40 50 60 70 80 90 100

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

Run number

600 800 1000 1200 1400

RMS of residuals y mean [um]

20 30 40 50 60 70 80 90 100

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

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Telescope Timing @ DESY

0.73 0.735 0.74 0.745 0.75 0.755 0.76 0.765 0.77 0.775

) [ns]σTime Resolution (1

14 14.5 15 15.5 16 16.5 17 17.5 18

Time Resolution

00 deg 15 deg 30 deg 45 deg

MuPix7 Spatial Resolution

µm]

X Residual [

−100−80−60−40−20 0 20 40 60 80 100

m]µY Residual [

−100

−80

−60

−40

−20 0 20 40 60 80 100

1 10 102 103 104

µm]

Residual of matched hit [

−300 −200 −100 0 100 200 300

Entries [1/run]

0 50 100 150 200 250

103

×

µm 19.8+-0.2 σ X Residual

µm 18.3+-0.2 Y Residual σ

Resolution is dominated by the pixel size!

Multiple Scattering small enough for 4 GeV/c electrons Resolution in x slightly worse than in y: Feature of pixel size

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