Beam Test Results with BCM and TowerJazz CMOS F9 Weekly

Bojan Hiti from Jožef Stefan Institute in Ljubljana, Slovenia conducted a series of tests involving BCM prototype readout chip and TowerJazz CMOS at CERN SPS H6. The experiments included beam tracking, analog readout, and chip configurations for the ATLAS Beam Condition Monitor upgrade. Detailed results and methodologies were presented in weekly reports from October 2018, showcasing advancements in particle tracking and detector technologies.

• Beam Test
• BCM
• TowerJazz CMOS
• CERN
• Particle Physics

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1. Beam test results with BCM' and TowerJazz CMOS F9 weekly, Ljubljana, Slovenia, 07. 12. 2018 Bojan Hiti (Jo ef Stefan Institute, Ljubljana, Slovenia) Bojan Hiti (IJS)

2. October 2018 Test beam campaign October 2018 Test beam campaign Test beam at CERN SPS H6 10 24 October, +120 GeV hadrons Two separate projects: PART 1: BCM' prototype readout chip PART 2: TowerJazz CMOS investigator Kartel beam telescope 6 mimosa planes + 1 FEI4 module < 5 m tracking resolution DRS4 readout of DUTs, few channels 26. 09. 2024 Bojan Hiti (IJS) 2 F9 weekly

3. CERN H6 test beam CERN H6 test beam 10 17 October, CERN SPS H6 test beam: 120 GeV hadrons Mimosa beam telescope 6 mimosa planes for tracking 1 FEI4 module for timing and region of interest (ROI) trigger Tracking resolution 3 m DRS 4 analog readout 3 GS/s acquisition rate, 700 MHz bandwidth Recorded one channel per chip per run two channels per run Dataset: All channels measured (separate runs) 200k telescope triggers per channel 60k tracks All tests done with one version of front end configuration + 1000 V bias voltage DUT 3 planes + timing + ROI 3 planes 26. 09. 2024 Bojan Hiti (IJS) 3 F9 weekly

4. PART 1: BCM' 26. 09. 2024 Bojan Hiti (IJS) 4 F9 weekly

5. BCM' chip BCM' chip BCM': Readout ASIC prototype for ATLAS Beam Condition Monitor (BCM) upgrade for HL-LHC Analog front end with 4 readout channels Current amplifier, fast pulses (baseline restored after < 25 ns) Two BCM' wire bonded to a specially segmented diamond sensor Large pitch bump bonding also considered to reduce capacitance Chip configuration with external DACs via a Labview interface [2, 1] [1, 3] [1, 4] [2, 2] Chip 1 Chip 2 [2, 3] [1, 1] [1, 2] [2, 4] 26. 09. 2024 Bojan Hiti (IJS) 5 F9 weekly

6. Single event waveform Charge measurement Charge measurement U (V) Average waveform of 1000 acquisitons Select an integration window around the peak [tmin, tmax] (typically [ 6 ns, 6 ns]) Waveform subtraction to mitigate pick up w.r.t. track position Signal = Integral around the peak Hit criterium: signal > 4 above noise charge 20 mV (Landau tail) Noise spectrum baseline offset +4 26. 09. 2024 Bojan Hiti (IJS) 6 F9 weekly

7. Chip 2, channel 1 Chip 2, channel 1 26. 09. 2024 Bojan Hiti (IJS) 7 F9 weekly

8. Channel 2 Channel 2 26. 09. 2024 Bojan Hiti (IJS) 8 F9 weekly

9. Channel 3 Channel 3 zoom on next slide 26. 09. 2024 Bojan Hiti (IJS) 9 F9 weekly

10. Chip 2 channel 3 Chip 2 channel 3 26. 09. 2024 Bojan Hiti (IJS) 10 F9 weekly

11. Conclusions Conclusions Debugged the software, now nice test beam results Final analysis code uploaded to Git: https://github.com/bhiti/testbeam_analysis_drs The plan is to create a Git repository with the "full" test beam software collected in one place Working on obtaining an eos partition to save the BCM' data 26. 09. 2024 Bojan Hiti (IJS) 11 F9 weekly

12. PART 2: TowerJazz Investigator CMOS 26. 09. 2024 Bojan Hiti (IJS) 12 F9 weekly

13. TowerJazz Investigator TowerJazz Investigator CMOS prototype based on small collection electrode architecture Old (2015) analog only design Based on this prototype fully monolithic chips TJ MonoPix and TJ MALTA have been produced Fully monolithic samples have reduced efficiency in pixel corners after irradiation Agenda: Measure efficiency with Investigator and correlate with E-TCT Caveat: can read out only one pixel per channel readout 2 x 2 pixels (50 x 50 um2 pixel size) low rate! 10 x 10 pixel array 8 x 8 active pixels dummy pixels 26. 09. 2024 Bojan Hiti (IJS) 13 F9 weekly

14. Test beam Test beam Sample: 1e15 neutron irradiated ROI: 1250 x 400 um2 (DUT 100 x 100 um2 cca. 0.5 % area) Charge sensitive amplifier relatively complicated charge calculation Pick up was also present Beam intensity was HUGE. Still working on reconstructing tracks For now only spectra Waveforms of 4 channels Signal wf, 2 references, discarded Charge = signal reference 26. 09. 2024 Bojan Hiti (IJS) 14 F9 weekly

15. Charge spectra Charge spectra 110k entries expect 130 full wfs per channel tracking t.b.d. 26. 09. 2024 Bojan Hiti (IJS) 15 F9 weekly

16. BACKUP 26. 09. 2024 Bojan Hiti (IJS) 16 F9 weekly

17. Trigger Trigger Acquisition triggered by the FEI4 module ROI to trigger only on tracks through the active area ROI determined in a test run by self triggering on the DUT HitOR ROI Telescope FEI4 ROI DRS4 Example ROI: (chip 1, ch. 4) + (chip 2, ch. 4) read out FEI4 26. 09. 2024 Bojan Hiti (IJS) 17 F9 weekly

18. Waveform subtraction Waveform subtraction U (V) Pick up has the same shape in all the channels Subtracting Ch. 2 from Ch. 1 reduces "noise" by a factor of 2 Additional selection has to be introduced for events when signal only in Ch. 2 Noise after subtraction Noise before subtraction 26. 09. 2024 Bojan Hiti (IJS) 18 F9 weekly

19. Waveform subtraction Waveform subtraction Blue wf = Black - red Fine tuning of the phase between black and red might reduce the noise 26. 09. 2024 Bojan Hiti (IJS) 19 F9 weekly