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Tests of ProtoDUNE beam-line ToF detectors

Karolína Jurá²ková

Supervisor: Jonathan Paley

Final Report

Summer Internship in Fermilab 2016

1 / 20 Karolína Jurá²ková Tests of ProtoDUNE beam-line ToF detectors

Content

Overview and simulations of particle separation

Tests and technical troubles

Installing pLAPPDs into muon telescope

Analysis of pulse shape measurements


ProtoDUNE - Particle Iden�cation

p, π, K, e present in charged-particle beam

Separation: all over the beam momentum range(1-10 GeV/c)

Time of Flight Measurements (ToF) with high timingresolution

Distance between ToF detectors 23 m

Time resolution below 100 ps required


Particle Separation - time resolution 50 ps, uncertainty inmomentum 2 %

TOF [ns]80 85 90 95 100 105 110

0

20

40

60

80

100

310×Pion

Kaon

Proton

l=23 m, time resolution 50 ps, p=1 GeV/c +-2%

TOF [ns]76.6 76.8 77 77.2 77.4 77.6 77.8 78 78.2 78.4

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000 Pion

Kaon

Proton


TOF [ns]76.5 76.6 76.7 76.8 76.9 77 77.1 77.2 77.3 77.40

2000

4000

6000

8000

10000 Pion

Kaon

Proton


TOF [ns]76.5 76.6 76.7 76.8 76.9 77 77.1 77.2 77.30

1000

2000

3000

4000

5000

6000

7000

8000

9000Pion

Kaon

Proton



Particle Separation - time resolution 170 ps, uncertainty inmomentum 2 %

TOF [ns]80 85 90 95 100 105 110

0

10000

20000

30000

40000

50000

60000

70000Pion

Kaon

Proton


TOF [ns]76.5 77 77.5 78 78.5

0

1000

2000

3000

4000

5000

6000

7000Pion

Kaon

Proton


TOF [ns]76.4 76.6 76.8 77 77.2 77.4 77.6 77.8

0

1000

2000

3000

4000

5000 Pion

Kaon

Proton


TOF [ns]76.4 76.6 76.8 77 77.2 77.4 77.6

0

500

1000

1500

2000

2500

3000

3500

4000

4500 Pion

Kaon

Proton



Pion and Kaon Separation

p [GeV/c]1 2 3 4 5 6 7 8 9 10

σ#

0

2

4

6

8

10

12

14

16

18

20 20 ps50 ps170 ps200 ps

σ3

ank K for different time resolutionπSeparation of

#σ = ∆TOF√RMS2

1+RMS22


Particle Separation - time resolutuion 50 ps

p [GeV/c]3 4 5 6 7 8 9 10

σ#

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3

time resolution 50 ps,uncertainty in momentum 0 %

p [GeV/c]3 4 5 6 7 8 9 10

σ#

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3


p [GeV/c]3 4 5 6 7 8 9 10

σ#

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3


p [GeV/c]2 3 4 5 6 7 8 9 10

σ#

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3



Particle Separation - time resolutuion 170 ps

p [GeV/c]2 3 4 5 6 7 8 9 10

σ#

0

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3


p [GeV/c]1 2 3 4 5 6 7 8 9 10

σ#

0

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3


p [GeV/c]1 2 3 4 5 6 7 8 9 10

σ#

0

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3


p [GeV/c]1 2 3 4 5 6 7 8 9 10

σ#

0

2

4

6

8

10

12

14

16

18

20 and KπK and p

and pπσ3



pLAPPD - prototype Large Area Picosecond PhotoDetector


Testing pLAPPDs from Argonne Lab:troubles and malfunctions

2 pLAPPDs 6 × 6 cm2 mounted on readout boards

�board #52 and board #53�

Testing pLAPPD in the LArIAT beamline in the Fermilab Test

Beam Facility (FTBF)

the test started just few days before the planned summer

accelerator shutdown

the board #53 was missing resistor and capacitor → /



Testing �good board� #52 with digitaloscilloscope → ,

read out single photoelectron (SPE) noisepulse shapes from each channel and withdi�erent cable lengths

Board #52 began misbehaving in the end of themeasurements → /Both boards sent to Argonne for repairing andchecking

Board #53 repaired, board #52 supposed to bealright after replacing resistor...



Problems with HV supply → /

board #53 brokensparks in board #52 when HV is above 2 kVunable to �nish test with oscilloscope

Preparing installation into muon telescope → ,The installation was delayed because of troubleswith both boards → /



Determine pLAPPD e�ciency vs. position

Determine pLAPPD position resolution



Mounting VME crate with CAEN V1751 digitizer

Mounting NIM crate with power supply


Making cables for redout from muon telescope

RG-174U signal cables with SMA and MCX connectors


Back to the pulse shape analysis

time [ns]2− 1− 0 1 2 3 4 5

U [m

V]

60−

50−

40−

30−

20−

10−

0

Pulses: threshold 15 mV, Channel L6


Distribution of pulse centroid tmax (threshold 15 mV)

Pulse amplitudes depends on where the SPE from spontanious

thermal emission is emitted

Location of pulse maximum depends on the amplitude

Based of the distribution of tmax the resolution is about 170 ps

In real meausurements we can correct for the e�ect of

amplitude → the resolution would be improved

hEntries 62Mean 0.6459RMS 0.1678

tmax [ns]0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

1

2

3

4

5

6

7

8

hEntries 62Mean 0.6459RMS 0.1678

tmax

A [mV]20 30 40 50 60

[ns]

max

t

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

vs. amplitude in channel L7, threshold 15 mVmaxt


Rise time and slope of leading edge

A [mv]15 20 25 30 35 40 45 50 55 60

slop

e of

lead

ing

edge

dU

/dt

[ns]

10

20

30

40

50

60

Slope vs. Amplitude in Channel L6Slope vs. Amplitude in Channel L6

A [mv]15 20 25 30 35 40 45 50 55

rise

time

[ns]

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

Rise time vs. Amplitude in Channel L6Rise time vs. Amplitude in Channel L6

A [mv]20 30 40 50 60 70

slop

e of

lead

ing

edge

dU

/dt

[ns]

10

20

30

40

50

60

Slope vs. Amplitude in Channel R6Slope vs. Amplitude in Channel R6

A [mv]20 30 40 50 60 70

rise

time

[ns]

0.9

1

1.1

1.2

1.3

1.4

Rise time vs. Amplitude in Channel R6Rise time vs. Amplitude in Channel R6


Amplitudes for di�erent cable lengths (threshold 5 mV)

histogramEntries 31Mean 8.485RMS 2.417

Amplitude [mV]5 6 7 8 9 10 11 12 13 14

0

0.5

1

1.5

2

2.5

3

3.5

4


Amplitudes, 2.2 feethistogram

Entries 31Mean 8.37RMS 2.363

Amplitude [mV]5 6 7 8 9 10 11 12 13 14

0

0.5

1

1.5

2

2.5

3

3.5

4


Amplitudes, 25 feet


Amplitude [mV]4 5 6 7 8 9 10 11 12

0

1

2

3

4

5

6


Amplitudes, 50 feet


The End

Thank you for attention!

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