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KU PIREActivities at:CERN

Testbeam in June

PSISensor Efficiency

FirmwarePixel eff. With overlaps

KUTestboardsTrimming in X-ray

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CERN - testbeam• When: June 2-18• Goal: Measure the efficiency and spatial

resolution of present sensors as function of irradiation dose

• What: Pixel telescope– Trigger, 4 chips to define track– Device under test in coldbox– 3T Magnetic field possible

• Devices tested:– Unirradiated– 6E14 Neq/cm2 (2years in first layer)– 1.2E15 Neq/cm2 (4 yrs)– 3E15 Neq/cm2

Beam trig t1 t2 dev t3 t4

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PSI – Sensor Efficiency

• Jennifer and Meghan (with Joaquin)

• Goals: – for each run, find when there

is a track as defined by the telescope and then see whether there is a hit where expected in the device under test -> efficiency

– Measure the spatial resolution and Lorentz angle at different incoming angles

What is happening now:-Use correlations between pixel hits on different telescope to define track

Resolution from fits shows that the beam is less than one pixel wide

- Loop through hits in first element and project to next one and see whether there is a hit where it is expected. Then a quick alignment will be done.

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PSI – Firmware - Yasen

• General testboard diagnosing

• Internal Timing Calibration– The plan: create algorithm

that increments “slope” variable until the two points meet smoothly and precisely independent of hardware

• TBM emulator improvements

55Yasen Ivanov, KU04/21/23

Clock limitations to units of 12.5 nsLogic cells used for even smaller units of ~0.5-1.5 ns

Logic cell does not change signal, just slightly delays it

Began measuring the timing delay adjustments for values between the 12.5 ns scale using logic cells

•KU-11•KU-23•PSI-14

Roc attached

•PSI board seemed already calibrated (manually), KU boards not

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PSI – pixel overlap efficiency• Valeria started and now helping Cameron (UNL)• Where modules overlap, can measure how efficient the

pixel detectors are with data from LHC

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KU – Board testing• Will, Avery, Chris, Danny, Thomas• Testboard production/testing

• Gatekeeper board production/testing– 10 made, but shipping problems and need to be tested

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KU - Trimming

• Thomas• What is trimming

– For each of 4160 pixels on one Readout Chip (ROC), you need to set the threshold above which the pixel will be read out

– There are several bits that need to be set. Current procedure uses a calibration pulse from the ROC itself. Pixels set one at a time and X-talk and other effects not accounted for.

• Use X-ray box instead?– This way, real signals are being obtained from the

sensors through the readout chain as they are in the detector instead of through just the ROC

– Will see if the trimming can be set by looking at the noise