Update on testbeam analysis with BCM 01 09

Update on testbeam analysis with BCM' 01. 09. 2017 Bojan Hiti Jožef Stefan Institute, Experimental Particle Physics Department (F 9) Ljubljana, Slovenia Bojan Hiti (IJS)

Test beam recap ● ● Test beam at CERN SPS 16 – 22 August 2017 Ljubljana (Kar. Tel) beam telescope: ● ● Proto 9 FEI 4 module for region of interest (ROI) selection and timing information 2 segmented diamond DUTs with single channel bonded to BCM' R/O chip: ● ● Board 5 E 5: 2 x 2 mm 2, Board 1 H 0: 4 x 4 mm 2, 2 nd stage BOX 1 2 nd stage BOX 2 ● Voltage scan: +500 V, +700 V, +1000 V, -1000 V, different trigger windows ● Tower. Jazz CMOS sample, 50 x 50 um 2 pixel size, short run 1 day B 5 B 1 trigger region 4 x 4 mm 2 Bojan Hiti (IJS) B 5 B 1 trigger region 1 x 1 mm 2 BCM' test beam B 1 trigger region edge 9. 9. 2020 2

Test beam setup ● ● Test beam at CERN SPS 21 – 28 June 2017 Ljubljana (Kar. Tel) beam telescope: ● ● 6 mimosa planes 18 x 18 μm 2 pixel size Proto 9 FEI 4 module for region of interest (ROI) selection and timing information Two scintillators for triggering DUT readout with DRS oscilloscope B 5 B 1 Proto 9 pion beam Sc. 3 mimosa planes Bojan Hiti (IJS) 3 mimosa planes BCM' test beam 9. 9. 2020 3

Signal height extraction maximum at 0 ns noise sampling window [-50 ns, -35 ns] – integrate waveform signal sampling window [-5 ns, 10 ns] – integrate waveform Average waveform calculated as an average of first 1000 recorded waveforms PULSE POLARITY = HV POLARITY Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 4

Results + 500 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 5

+ 500 V overview ● Recorded runs: ● ● ROI 4 x 4 mm 2 ● 1 M events 179570 passed cuts edge ● 413 k events 152856 passed ROI 4 x 4 mm 2 Bojan Hiti (IJS) ROI edge BCM' test beam 9. 9. 2020 6

Noise board 5 2 x 2 mm 2 board 1 4 x 4 mm 2 Noise level for the two DUTs: B 1 = 5. 1 m. V, B 5 = 3. 7 m. V Threshold for the signal discrimination set to 4σ in subsequent analysis Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 7

Efficiencies ROI 4 x 4 mm 2 eff. 97. 8 % eff. 95. 9 % Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 8

Charge spectra ● MPV values look similar. TODO: fits Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 9

Efficiency edge B 5 B 1 ● ● Find out a characterstic distance of the efficient inefficient transition on the edges Deduce on the effects of gaps between neighbor pads ● ● current gap size 10 um should it be different in next submission? Bojan Hiti (IJS) gaps 10 um BCM' test beam 9. 9. 2020 10

Efficiency edge Transition 90 % 10 % within 20 um But some tails remain outside of the structure bin size 11 um Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 11

Charge spectra edge All tracks go through active region On board 1 the spectrum shape is not a standard Landau + Gauss Events with charge 0 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 12

Results + 700 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 13

+ 700 V overview ● Recorded runs: ● ● ROI 4 x 4 mm 2 ● 1 M events 172064 passed cuts edge ● 560 k events to be done ROI 4 x 4 mm 2 Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 14

Efficiency + 700 V eff. 97. 7 % Bojan Hiti (IJS) eff. 98. 3 % BCM' test beam 9. 9. 2020 15

Charge spectra + 700 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 16

Results + 1000 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 17

+ 1000 V overview ● Recorded runs: ● ● ROI 4 x 4 mm 2 ● 1. 2 M events 193063 passed ROI 1 x 1 mm 2 ● 1. 2 M events to be done ROI 4 x 4 mm 2 Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 18

Efficiency + 1000 V eff. 99. 1 % eff. 99. 3 % surface w/ eff > 50 %: 3. 8 mm 2 surface w/ eff > 50 %: 14. 9 mm 2 Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 19

Charge spectra + 1000 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 20

Pulse Height Map Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 21

Results - 1000 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 22

+ 1000 V overview ● - 1000 V: 2 ● ROI 4 x 4 mm 840 k 133920 passed ROI 1 x 1 mm 2 400 k to be done ● ROI 4 x 4 mm 2 Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 23

Efficiency - 1000 V Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 24

Results CMOS Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 25

Efficiency - 1000 V Still a lot of work required to get correct event selection Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 26

Summary and conclusion ● ● ● Test beam quite successful, collected a reasonable amount of data Analysis ongoing, first results available Still to do Overall efficiency improves with bias voltage, > 99 % can be achieved at + 1000 V Studied charge collection on the edges Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 27

BACKUP Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 28

Test beam setup ● ● Test beam at CERN SPS 21 – 28 June 2017 Ljubljana (Kar. Tel) beam telescope: ● ● 2 segmented diamond DUTs with single channel bonded to BCM' R/O chip: ● ● 6 mimosa planes 18 x 18 μm 2 pixel size Proto 9 FEI 4 module for region of interest (ROI) selection and timing information Two scintillators for triggering Board 1: 2 x 2 mm 2 Board 5: 4 x 4 mm 2 both DUTs in the beam simultaneously DUT readout with DRS oscilloscope B 5 B 1 Proto 9 pion beam Sc. 3 mimosa planes Bojan Hiti (IJS) 3 mimosa planes BCM' test beam 9. 9. 2020 29

Triggering scheme telescope DRS 4 sc. 1 sc. 2 HITOR trg in B 1 B 5 telescope acknowledge trg out trg in trg out ch 1 ch 2 ch 3 ch 4 trg in Proto 9 Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 30

Data conversion and reconstruction ● Raw data has to be converted into Judith ROOT format for final analysis ● DRS 4: ● ● ● Proto 9: ● ● Remove events without telescope acknowledge pulse, convert the rest to Judith Number of remaining events is exactly equal to the number of raw telescope events and FEI 4 events Convert into Judith format with Py. Bar software. No events are lost. Telescope: ● ● ● Convert raw data with Judith. 1 ‰ of events is not recognized and is lost (do not know which ones). This later necessitates time stamp based synchronization with the DUT. Due to a long integration time of MIMOSA sensors (100 μs) the average track multiplicity in the telescope is 10. Also, estimated track reconstruction efficiency is < 50 %. Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 31

Data synchronization ● ● Required since telescope and DUT events cannot be matched one-to-one Based on comparison of time stamp delta: Δt 1, i+1 Δt 1, i+2 Δt 2, i+1 Δt 2, i+2 Δt 1, i+4 Δt 1, i+3 Δt 2, i+4 Δt 2, i+5 time drop this event Δt 2, i+1 Δt 2, i+2 Δt 2, i+3 Δt 2, i+4 observe the ratio of time stamp delta for the last 10 events If the ratio is out of prescribed margins, then try shifting the sequences Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 32

Synchronization example time stamp telescope 23118731345 23118731380 23118731398 23118731418 23118731435 23118731455 23118731480 23118731499 23118731517 23118731537 23118731557 23118731579 23118731617 23118731637 23118731657 23118731674 23118731694 time stamp DRS 4 1005900474 1006193044 1006331441 1006486332 1006635409 1006793400 1006976112 1007143599 1007279253 1007434513 1007597312 1007777709 1008079992 1008227599 1008398025 1008539042 1008692353 Delta telescope Delta DRS 4 200000 160429 350000 292570 180000 138397 200000 154891 170000 149077 200000 157991 250000 182712 190000 167487 180000 135654 200000 155260 200000 162799 220000 180397 380000 302283 200000 147607 200000 170426 170000 141017 200000 153311 time stamp ratio 1. 25 1. 20 1. 30 1. 29 1. 14 1. 27 1. 37 1. 13 1. 33 1. 29 1. 23 1. 22 1. 26 1. 35 1. 17 1. 21 1. 30 Due to a small variation of the Delta between consequtive events it can be difficult to pin-point the precise desynchronization spots Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 33

Event selection ● Due to a low track reconstruction efficiency fake hits need to be actively filtered out triggered track (not reconstructed) no pulse in WF DUT ROI distance between Proto 9 and telescope hits to large later track (+ 10 μs) (reconstructed, no WF) reduces efficiency ● Track selection cuts ● ● Residual of telescope tracks and Proto 9 have to be within 1 pixel size discarding events with > 1 telescope track in the ROI discarding events with > 1 hit in the Proto 9 Typically 10 -20 % events pass the cuts Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 34

Efficiencies ROI 4 x 4 mm 2 eff. 97. 8 % eff. 95. 9 % Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 35

Efficiency + 700 V eff. 97. 7 % Bojan Hiti (IJS) eff. 98. 3 % BCM' test beam 9. 9. 2020 36

Efficiency + 1000 V eff. 98. 7 % eff. 99. 3 % surface w/ eff > 50 %: 3. 8 mm 2 surface w/ eff > 50 %: 14. 9 mm 2 Bojan Hiti (IJS) BCM' test beam 9. 9. 2020 37