Efficiency and timing measurements with pixel-modules Julien Beyer - - PowerPoint PPT Presentation

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Efficiency and timing measurements with pixel-modules Julien Beyer - - PowerPoint PPT Presentation

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Efficiency and timing measurements with pixel-modules Julien Beyer II. Physikalisches Institut der Georg-August-Universitt Gttingen 26.10.2015 Introduction Large Hadron Collider Julien Beyer 2 / 21 Introduction A Toroidal LHC ApparatuS

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SLIDE 1

Efficiency and timing measurements with pixel-modules

Julien Beyer

  • II. Physikalisches Institut der Georg-August-Universität Göttingen

26.10.2015

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SLIDE 2

Introduction

Large Hadron Collider

Julien Beyer 2 / 21

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SLIDE 3

Introduction

A Toroidal LHC ApparatuS

Julien Beyer 3 / 21

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SLIDE 4

Introduction

High Luminosity LHC

HL-LHC

  • higher luminosity → higher particle count
  • detector needs to cope with higher demands

Motivation ITk

  • resist harsher conditions
  • cope with particle count

→ all silicon tracker

  • end of lifetime of Inner Detector

Need for...

  • new generation of pixel detector
  • reproducible and unbiased tests during development
  • benchmarks for final comparison

Julien Beyer 4 / 21

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SLIDE 5

Introduction

Measurement setup

sensor front-end

connection MIP

→ use laser to inject charge with high precission

Probestation

  • probestation for positioning and housing of modules
  • accuracy of positioning: 0.25 µm (x/y) / 0.1 µm (z)
  • laser system: 671 nm pulsed laser, external triggering, spot size: ≈ 1−2 µm

Julien Beyer 5 / 21

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SLIDE 6

Efficiency measurements

Spatially resolved

Aim

  • spatially resolved hit efficiency
  • time resolved hit efficiency

Measurement

  • use well-known module

(FE-I4A + planar n-in-p) for approval

  • hole in metallization enables

laser injections

  • measurement region:

250×250 µm2 @ 2 µm

  • 1000 injections per point
  • amount of injected charge can

be varied

Julien Beyer 6 / 21

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SLIDE 7

Efficiency measurements

Spatially resolved

  • threshold of discriminator: 3000 e
  • injected charge: ≈6000 e

m] µ x-direction [ 50 100 150 200 250 m] µ y-direction [ 50 100 150 200 250 Efficiency 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Julien Beyer 7 / 21

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SLIDE 8

Efficiency measurements

Spatially resolved

  • injected charge: ≈9000 e

m] µ x-direction [ 50 100 150 200 250 m] µ y-direction [ 50 100 150 200 250 Efficiency 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Julien Beyer 8 / 21

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SLIDE 9

Efficiency measurements

Spatially resolved

  • injected charge: ≈20 000 e

m] µ x-direction [ 50 100 150 200 250 m] µ y-direction [ 50 100 150 200 250 Efficiency 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Julien Beyer 9 / 21

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SLIDE 10

Efficiency measurements

Time resolved

Timing

  • important: assign hits in detector to correct bunch crossing
  • module composition essential for timing behaviour

→ figure of merit

  • determine in-time efficiency...
  • ...in dependence of amount of charge → timewalk

Julien Beyer 10 / 21

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SLIDE 11

Timing measurements

in-time efficiency

clock

Julien Beyer 11 / 21

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SLIDE 12

Timing measurements

in-time efficiency

clock laser-trigger

Julien Beyer 12 / 21

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SLIDE 13

Timing measurements

in-time efficiency

clock laser-trigger Pre-amplifier

Julien Beyer 13 / 21

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SLIDE 14

Timing measurements

in-time efficiency

clock laser-trigger Pre-amplifier discriminator

Julien Beyer 14 / 21

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SLIDE 15

Timing measurements

in-time efficiency latency trigger delay

clock laser-trigger Pre-amplifier trigger discriminator

Julien Beyer 15 / 21

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SLIDE 16

Timing measurements

in-time efficiency

  • measurement: vary laser-trigger → sample acceptance window

latency trigger delay

clock laser-trigger Pre-amplifier trigger discriminator

Julien Beyer 16 / 21

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SLIDE 17

Timing measurements

in-time efficiency

  • FWHM: 24.97 ns

delay [ns]

5 10 15 20 25 30 35 40

efficiency

0.2 0.4 0.6 0.8 1

position [ns] 0.00494 ± 8.841 [ns] σ 0.006729 ± 0.4386 maximum 0.002886 ± 0.9991 position [ns] 0.00494 ± 8.841 [ns] σ 0.006729 ± 0.4386 maximum 0.002886 ± 0.9991 position [ns] 0.00494 ± 8.841 [ns] σ 0.006729 ± 0.4386 maximum 0.002886 ± 0.9991 position [ns] 0.004211 ± 33.81 [ns] σ 0.005555 ± 0.4259 maximum 0.003265 ± 1.001 Julien Beyer 17 / 21

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SLIDE 18

Timing measurements

Timewalk

  • timewalk results from charge-dependent slope of preamplifier
  • ∆t(big charge↔small charge) = 20-50 ns

→ important for hit allocation

threshold preamp.

  • ut

Julien Beyer 18 / 21

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SLIDE 19

Timing measurements

Timewalk

  • plateau for large charges (> 15000 e)
  • large slope for smaller charges

[e]

inj

Q 10000 20000 30000 40000 50000 Delay [ns] 35 40 45 50 55 laser internal injection

Julien Beyer 19 / 21

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SLIDE 20

Conclusion

Spatially resolved efficiency measurements

  • measurement principle and analysis tools established
  • easy way to obtain basic and fundamental information

Time resolved efficiency measurements

  • timing is important for hit allocation
  • timing can be measured very precisely

Julien Beyer 20 / 21

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SLIDE 21

The End

Thank you for your attention

Julien Beyer 21 / 21

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SLIDE 22

Backup

Julien Beyer 1 / 17

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SLIDE 23

Spatially resolved hit efficiency

  • threshold of discriminator: 3000 e
  • injected charge: ≈6000 e

m] µ x-direction [ 50 100 150 200 250 m] µ y-direction [ 50 100 150 200 250 ToT [BC] 0.5 1 1.5 2 2.5 3 3.5

Julien Beyer 2 / 17

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SLIDE 24

Spatially resolved hit efficiency

  • injected charge: ≈9000 e

m] µ x-direction [ 50 100 150 200 250 m] µ y-direction [ 50 100 150 200 250 ToT [BC] 0.5 1 1.5 2 2.5 3 3.5

Julien Beyer 3 / 17

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SLIDE 25

Spatially resolved hit efficiency

  • injected charge: ≈20 000 e

m] µ x-direction [ 50 100 150 200 250 m] µ y-direction [ 50 100 150 200 250 ToT [BC] 1 2 3 4 5 6 7 8 9

Julien Beyer 4 / 17

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SLIDE 26

Backup

+ + +

  • n-dotiert

p-dotiert

E

Julien Beyer 5 / 17

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SLIDE 27

Backup

n-dotiert p-dotiert

E

Julien Beyer 6 / 17

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SLIDE 28

Backup

n-dotiert p-dotiert

E

  • +

+ + +

Ionisierende Strahlung

Julien Beyer 7 / 17

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SLIDE 29

Backup

Julien Beyer 8 / 17

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SLIDE 30

Backup

preamplifier discriminator threshold

Julien Beyer 9 / 17

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SLIDE 31

Backup

GDAC/TDAC - Threshold

preamplifier discriminator threshold

Julien Beyer 10 / 17

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SLIDE 32

Backup

GDAC/TDAC - Threshold

preamplifier discriminator threshold

Julien Beyer 11 / 17

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SLIDE 33

Backup

FDAC/IF - discharge current

preamplifier discriminator threshold

Julien Beyer 12 / 17

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SLIDE 34

Backup

FDAC/IF - discharge current

preamplifier discriminator threshold

Julien Beyer 13 / 17

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SLIDE 35

Backup

FDAC/IF - discharge current

preamplifier discriminator threshold

Julien Beyer 14 / 17

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SLIDE 36

Backup

Beam-spot size

m] µ z-position [

  • 1000
  • 800
  • 600
  • 400
  • 200

m] µ lasersize [ σ 1- 2 4 6 8 10 12

magnification × 10 magnification × 20 magnification × 50

Julien Beyer 15 / 17

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SLIDE 37

Backup

3D sensors

Julien Beyer 16 / 17

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SLIDE 38

Backup

ATLAS

Julien Beyer 17 / 17