Beam Test Results with BCM and TowerJazz CMOS F9 Weekly
Beam test results with BCM' and TowerJazz CMOS
F9 weekly, Ljubljana, Slovenia,
07
. 12. 2018
Bojan Hiti (Jožef Stefan Institute, Ljubljana, Slovenia)
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Test beam at CERN SPS H6 10 – 24 October, +120 GeV hadrons
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Two separate projects:
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PART 1: BCM' prototype readout chip
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PART 2: TowerJazz CMOS investigator
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Kartel beam telescope
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6 mimosa planes + 1 FEI4 module
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< 5
μ
m tracking resolution
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DRS4 readout of DUTs, few channels
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10 – 17 October, CERN SPS H6 test beam: 120 GeV
hadrons
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Mimosa beam telescope
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6 mimosa planes for tracking
•
1 FEI4 module for timing and region of interest
(ROI) trigger
•
Tracking resolution ≈ 3
μ
m
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DRS 4 analog readout
•
3 GS/s acquisition rate, 700 MHz bandwidth
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Recorded
one channel per chip
per run – two
channels per run
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Dataset:
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All channels measured (separate runs)
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200k telescope triggers per channel
60k tracks
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All tests done with one version of front end
configuration
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+ 1000 V bias voltage
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DUT
3 planes + timing + ROI
3 planes
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PART 1: BCM'
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BCM': Readout ASIC prototype for ATLAS Beam Condition
Monitor (BCM) upgrade for HL-LHC
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Analog front end with 4 readout channels
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Current amplifier, fast pulses (baseline restored after < 25 ns)
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Two BCM' wire bonded to a specially segmented diamond sensor
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Large pitch bump bonding also considered to reduce capacitance
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Chip configuration with external DACs via a Labview interface
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Chip 1
Chip 2
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Average waveform of 1000 acquisitons
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Select an integration window around the peak [
t
min
,
t
max
]
(typically [– 6 ns, 6 ns])
•
Waveform subtraction to mitigate pick up – w.r.t. track
position
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Signal = Integral around the peak
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Hit criterium:
signal > 4
σ
above noise
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zoom on next slide
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Debugged the software, now nice test beam results
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Final analysis code uploaded to Git:
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https://github.com/bhiti/testbeam_analysis_drs
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The plan is to create a Git repository with the "full" test beam software collected in one place
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Working on obtaining an eos partition to save the BCM' data
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PART 2: TowerJazz Investigator CMOS
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CMOS prototype based on small collection electrode
architecture
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Old (2015) analog only design
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Based on this prototype fully monolithic chips TJ MonoPix
and TJ MALTA have been produced
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Fully monolithic samples have reduced efficiency in pixel
corners after irradiation
•
Agenda: Measure efficiency with Investigator and
correlate with E-TCT
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Caveat: can read out only one pixel per channel
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readout 2 x 2 pixels (50 x 50 um2 pixel size) – low rate!
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Sample:
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1e15 neutron irradiated
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ROI: 1250 x 400 um2 (DUT 100 x 100 um2 – cca. 0.5 % area)
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Charge sensitive amplifier – relatively complicated charge calculation
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Pick up was also present
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Beam intensity was HUGE. Still working on reconstructing tracks
•
For now only spectra
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Waveforms of 4 channels
Signal wf
,
2 references
,
discarded
Charge =
signal
–
reference
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110k entries
expect 130 full wfs per channel
tracking t.b.d.
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BACKUP
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Acquisition triggered by the FEI4 module
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ROI to trigger only on tracks through the active area
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ROI determined in a test run by self triggering on the DUT
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Example ROI:
(chip 1, ch. 4) + (chip 2, ch. 4)
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Pick up has the same shape in all the channels
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Subtracting
Ch. 2
from
Ch. 1
reduces "noise" by a factor of ≈ 2
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Additional selection has to be introduced for events when signal only
in
Ch. 2
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U (V)
Noise before subtraction
Noise after subtraction
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Blue wf
= Black -
red
Fine tuning of the phase between
black
and
red
might
reduce the noise
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.
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Presentation Transcript
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)
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
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
PART 1: BCM' 26. 09. 2024 Bojan Hiti (IJS) 4 F9 weekly
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
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
Chip 2, channel 1 Chip 2, channel 1 26. 09. 2024 Bojan Hiti (IJS) 7 F9 weekly
Channel 2 Channel 2 26. 09. 2024 Bojan Hiti (IJS) 8 F9 weekly
Channel 3 Channel 3 zoom on next slide 26. 09. 2024 Bojan Hiti (IJS) 9 F9 weekly
Chip 2 channel 3 Chip 2 channel 3 26. 09. 2024 Bojan Hiti (IJS) 10 F9 weekly
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
PART 2: TowerJazz Investigator CMOS 26. 09. 2024 Bojan Hiti (IJS) 12 F9 weekly
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
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
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
BACKUP 26. 09. 2024 Bojan Hiti (IJS) 16 F9 weekly
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
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
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
