Progress of x-ray tests at ETH Marco Rossini Institute for Particle - - PowerPoint PPT Presentation

Progress of x-ray tests at ETH

Marco Rossini

Institute for Particle Physics, ETH Zürich

• 26. March 2012

Marco Rossini (ETH) X-ray test progress

• 26. March 2012

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Setup progress

The x-ray setup currently consists of

◮ X-ray tube, generator, cabin ◮ Single ROC setup with temperature control (17°C) with shielded

testboard

◮ Movable array of fluorescence targets ◮ Spectrometer

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Single ROC setup

◮ ROC in thermal contact with cooling plate ◮ Plate cooled with peltier element, measured with Pt1000 ◮ Temperature controller establishes stable conditions ◮ Not in final state yet

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Fluorescence setup

◮ Array with 7 slots for

target materials

◮ Target change through

motion of entire array with linear stage

◮ Construction designed for minimal parasitic fluorescence emission

and for large yield

◮ Option for Kβ filtering (attachment not shown in picture) ◮ Targets obtained until now:

Iron (Fe), Copper (Cu), Molybdenum (Mo), Silver (Ag), Tin (Sn)

◮ Target under evaluation: Barium (Ba) compound (powder)

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Fluorescence spectra

Steel (Fe) Copper (Cu) Molybdenum (Mo) Silver (Ag) Tin (Sn) Barium chloride Spectra of all materials using current setup:

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High rate pixel map test

Double column 5 10 15 20 25 Hits 2000 4000 6000 8000 10000 12000 14000

DCol hit map ROC 0

DCol test

Column 10 20 30 40 50 Row 10 20 30 40 50 60 70 80 50 100 150 200 250 300

Pixel hit map

Bump bonding test Features:

◮ Triggers at a user set frequency ◮ Test duration user set ◮ Accumulated pixel hits sent to the

computer

◮ Pixel hits histogrammed in 2d

and 1d

◮ Pulse height histogrammed ◮ Hit multiplicity histogrammed ◮ Time < 1 min total

Used for

◮ Double column test ◮ Bump bonding test

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High rate efficiency test

Column 10 20 30 40 50 Row 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 90 100

Pixel efficiency map module

Entries 4160 Mean 94.11 RMS 2.664 Underflow Overflow Integral 4160

Efficiency [%] 20 40 60 80 100 Pixels 100 200 300 400 500 600 700

Entries 4160 Mean 94.11 RMS 2.664 Underflow Overflow Integral 4160

Pixel efficiency distribution ROC 0

∼ 96 MHz / cm2 ∼ 96 MHz / cm2 Features

◮ Uses calibrate signal to inject each pixel N times along with x-rays ◮ Reads out hits, distinguishing pixels ◮ Compares number of read out pixels with N to compute efficiency ◮ Time ∼ 2 min (1 ROC, bandwidth limited)

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High rate s-curve test

Entries 4089 Mean 61.22 RMS 1.209 Underflow Overflow Integral 4089 Threshold (VCal units) 50 100 150 200 250 # Pixels 200 400 600 800 1000 1200 Entries 4089 Mean 61.22 RMS 1.209 Underflow Overflow Integral 4089

Threshold (xray)

Entries 4089 Mean 4.648 RMS 0.6896 Underflow Overflow 2 Integral 4087 Noise (VCal units) 1 2 3 4 5 6 7 8 9 10 # Pixels 200 400 600 800 1000 1200 1400 Entries 4089 Mean 4.648 RMS 0.6896 Underflow Overflow 2 Integral 4087

Noise (xray)

∼ 93 MHz / cm2 ∼ 93 MHz / cm2 Features

◮ Determines the s-curve for each pixel in terms of VCal by injecting

the calibrate signal with varying strength

◮ Works while under x-ray radiation ◮ Time ∼ 30 min (1 ROC, bandwidth limited)

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VCal calibration

Using existing test:

◮ VcThr scan while under monochromatic x-rays → s-curve ◮ Set found value of VcThr ◮ Threshold map in terms of VCal for all pixels ◮ Averages over all pixels on a chip ◮ Yields VCal corresponding to x-ray energy ◮ Use multiple x-ray lines to make linear calibration

Time:

◮ Takes 3 minutes per line (clock stretch 100, 30k Triggers) ◮ Yields 20k Hits above threshold (in old module test: < 1k) ◮ Can increase trigger frequency by factor of 10 (firmware change) ◮ Can live with only 2k Hits or increase time spent ◮ Can test multiple modules at once

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S-curve for VCal calibration

VcThr

VcThr scan with monochromatic x-rays (Molybdenum fluorescence)

a = 51.0142 ± 0.6055 (1.187%) b = 2.37153 ± 0.2979 (12.56%) c = 2754 ± 567 (20.59%) d = 58.7048 ± 0.1589 (0.2707%) e = 2.82404 ± 0.2015 (7.135%) f = 297.546 ± 25.95 (8.721%) g = 17782 ± 767.7 (4.318%) h = 56.7872 ± 9.378 (16.51%) Marco Rossini (ETH) X-ray test progress

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Summary

◮ A working setup exists for single ROCs ◮ Setup for direct and fluorescence illumination is done ◮ Many tests are implemented and working

Outlook:

◮ Measure fluorescence and direct spectra (with Daniel Narrias) ◮ Measure beam profile for designing module setup (with Daniel) ◮ Understand some issues that measurements show

More distant outlook:

◮ Verify tests work with full modules ◮ Design module setup ◮ Implement more tests (?)

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