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

Efficiency and timing measurements with pixel-modules Julien Beyer II. Physikalisches Institut der Georg-August-Universität Göttingen 26.10.2015

Introduction Large Hadron Collider Julien Beyer 2 / 21

Introduction A Toroidal LHC ApparatuS Julien Beyer 3 / 21

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

Introduction Measurement setup sensor MIP connection front-end → 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

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 µm 2 @ 2 µm • 1000 injections per point • amount of injected charge can be varied Julien Beyer 6 / 21

Efficiency measurements Spatially resolved • threshold of discriminator: 3000 e • injected charge: ≈ 6000 e 250 1 m] Efficiency µ y-direction [ 0.9 200 0.8 0.7 150 0.6 0.5 100 0.4 0.3 0.2 50 0.1 0 0 0 50 100 150 200 250 µ x-direction [ m] Julien Beyer 7 / 21

Efficiency measurements Spatially resolved • injected charge: ≈ 9000 e 250 1 m] Efficiency µ y-direction [ 0.9 200 0.8 0.7 0.6 150 0.5 100 0.4 0.3 0.2 50 0.1 0 0 0 50 100 150 200 250 µ x-direction [ m] Julien Beyer 8 / 21

Efficiency measurements Spatially resolved • injected charge: ≈ 20 000 e 250 1 m] Efficiency µ y-direction [ 0.9 200 0.8 0.7 0.6 150 0.5 100 0.4 0.3 0.2 50 0.1 0 0 0 50 100 150 200 250 µ x-direction [ m] Julien Beyer 9 / 21

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

Timing measurements in-time efficiency clock Julien Beyer 11 / 21

Timing measurements in-time efficiency clock laser-trigger Julien Beyer 12 / 21

Timing measurements in-time efficiency clock laser-trigger Pre-amplifier Julien Beyer 13 / 21

Timing measurements in-time efficiency clock laser-trigger Pre-amplifier discriminator Julien Beyer 14 / 21

Timing measurements in-time efficiency clock laser-trigger Pre-amplifier discriminator trigger trigger delay latency Julien Beyer 15 / 21

Timing measurements in-time efficiency • measurement: vary laser-trigger → sample acceptance window clock laser-trigger Pre-amplifier discriminator trigger trigger delay latency Julien Beyer 16 / 21

Timing measurements in-time efficiency • FWHM: 24 . 97 ns efficiency 1 ± position [ns] 33.81 0.004211 0.8 σ ± [ns] 0.4259 0.005555 ± maximum 1.001 0.003265 0.6 0.4 ± ± ± position [ns] position [ns] position [ns] 8.841 8.841 8.841 0.00494 0.00494 0.00494 0.2 σ σ σ ± ± ± [ns] [ns] [ns] 0.4386 0.4386 0.4386 0.006729 0.006729 0.006729 ± ± ± maximum maximum maximum 0.9991 0.9991 0.9991 0.002886 0.002886 0.002886 0 5 10 15 20 25 30 35 40 delay [ns] Julien Beyer 17 / 21

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. out Julien Beyer 18 / 21

Timing measurements Timewalk • plateau for large charges ( > 15000 e) • large slope for smaller charges Delay [ns] 55 laser internal injection 50 45 40 35 0 10000 20000 30000 40000 50000 Q [e] inj Julien Beyer 19 / 21

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

The End Thank you for your attention Julien Beyer 21 / 21

Backup Julien Beyer 1 / 17

Spatially resolved hit efficiency • threshold of discriminator: 3000 e • injected charge: ≈ 6000 e 250 m] ToT [BC] 3.5 µ y-direction [ 3 200 2.5 150 2 1.5 100 1 50 0.5 0 0 0 50 100 150 200 250 µ x-direction [ m] Julien Beyer 2 / 17

Spatially resolved hit efficiency • injected charge: ≈ 9000 e 250 m] ToT [BC] 3.5 µ y-direction [ 3 200 2.5 150 2 1.5 100 1 50 0.5 0 0 0 50 100 150 200 250 µ x-direction [ m] Julien Beyer 3 / 17

Spatially resolved hit efficiency • injected charge: ≈ 20 000 e 250 m] ToT [BC] µ y-direction [ 9 8 200 7 6 150 5 4 100 3 2 50 1 0 0 0 50 100 150 200 250 µ x-direction [ m] Julien Beyer 4 / 17

Backup n-dotiert p-dotiert + - + E - + - Julien Beyer 5 / 17

Backup n-dotiert p-dotiert E Julien Beyer 6 / 17

Backup n-dotiert p-dotiert + - - + E + - - + Ionisierende Strahlung Julien Beyer 7 / 17

Backup Julien Beyer 8 / 17

Backup threshold preamplifier discriminator Julien Beyer 9 / 17

Backup GDAC/TDAC - Threshold threshold preamplifier discriminator Julien Beyer 10 / 17

Backup GDAC/TDAC - Threshold threshold preamplifier discriminator Julien Beyer 11 / 17

Backup FDAC/IF - discharge current threshold preamplifier discriminator Julien Beyer 12 / 17

Backup FDAC/IF - discharge current threshold preamplifier discriminator Julien Beyer 13 / 17

Backup FDAC/IF - discharge current threshold preamplifier discriminator Julien Beyer 14 / 17

Backup Beam-spot size m] × 10 magnification µ 12 lasersize [ × 20 magnification 10 × 50 magnification σ 8 1- 6 4 2 -1000 -800 -600 -400 -200 0 µ z-position [ m] Julien Beyer 15 / 17

Backup 3D sensors Julien Beyer 16 / 17

Backup ATLAS Julien Beyer 17 / 17