TCHoU DPPD workshop 2022

DEVELOPMENT OF FOCAL-E ELECTRONICS PROTOTYPE IN ALICE

Presented by: Abderrahmane GHIMOUZ
On the behalf of FoCal team
22/03/2022

Personal Introduction
Abderrahmane GHIMOUZ

PostDoc
Ph. D. degree-Microelectronics
Master degree- Instrumentation Engineering- Microelectronics

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P.h .D work and results
Case of study: Hadrontherapy

The position of the Bragg peak can be controlled

The use of the spread-out Bragg peak

The impact of uncertainties on the dose deposit3P.h .D work and results
Case of study: HadrontherapyThe demonstrator must meet the following specifications:• A temporal resolution less than 100 ps;• An overall count rate that can reach the 100 MHz;• A very high resistance to radiation;• A very wide dynamic range (a single 250 MeV proton to 60 MeV proton packets);4P.h .D work and results
Subject: Design of a continuous time Delta-Sigma modulator for energy measurement
using diamond detectors

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P.h .D work and results
Results for the time measurement system

Developed 8 channels ASIC and its testing setup

6P.h .D work and results
Results for the time measurement system

Precision of the proposed model

Performance of the TIA
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P.h .D work and results
Results for the energy measurement system (ADC)

Exploring the use of the model based design approach8P.h .D work and results
Results for the energy measurement system (ADC)

Doing analog-to-digital conversion as early as possible

9P.h .D work and results
Results for the energy measurement system (ADC)✓ CT✓ Single loop
✓ High order loop filter✓ Mixed feedforward-feedback"Cascaded Resonators Feedforward" or CRFF topology

10P.h .D work and results
Results for the energy measurement system (ADC)

Simulated modulator performance

Power consumption estimation

11P.h .D work and results
List of publications:▪ [1] Abderrahmane Ghimouz et al. “A Preamplifier-discriminator circuit based on a Common Gate Feedforward TIA for fast timemeasurements using diamond detectors.” In: 2018 25th IEEE International Conference on Electronics, Circuits and Systems (ICECS).
2018, pp. 281–284. DOI: 10.1109/ICECS.2018.8617950.
▪ [2] Abderrahmane Ghimouz, et al. “Systematic high-level design of a fifth order Continuous-Time CRFF Delta Sigma ADC.” In: 2021
IEEE 12th Latin America Symposium on Circuits and System (LASCAS). 2021, pp. 1–4. DOI: 10.1109/LASCAS51355.2021.9459156.
▪ [3] Abderrahmane Ghimouz, et al. “Designing Opamp amplifiers for a 5th order CT CRFF DS ADC using Model-based design paradigm
and gm/ID methodology.” In: International Conference on Analog VLSI Circuits 2021.
▪ [4] Abderrahmane Ghimouz et al. “A multichannel front-end electronics ASIC for high-accuracy time measurements using diamonddetectors.” In: International Conference on Analog VLSI Circuits 2021.
▪ [5] Abderrahmane Ghimouz, et al. “New Design Approach of Front-End Electronics for high Accuracy Time Measurement Systems.” In:
2021 28th IEEE International Conference on Electronics, Circuits and Systems (ICECS). 2021, pp. 1-4, DOI:
10.1109/ICECS53924.2021.9665533.
▪ [6] Abderrahmane Ghimouz, et al. “DIAMASIC: A multichannel front-end electronics for high accuracy time measurements for diamonddetectors.” In: TWEPP 2021 Topical Workshop on Electronics for Particle Physics. 2021
12FoCal Project
Main physics goal: Nucleus structure at small -x

System composition:• FoCal-E:high-granularity
Si-W sampling
sandwich calorimeter for photons and 𝜋 0• FoCal-H: conventional metal-scintillator sampling
calorimeter for photon isolation and jets
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FoCal–E Detector
System design: Two readout granularities• PAD (LG) layers: granularity 1x1 cm2, analog
readout• PIXEL (HG) layers: 30x30 µm2 digital
readout (ALIPIDE)

Challenge:• Separate γ/𝜋 0 at high energy
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FoCal–E Detector
Each module:• 18 PAD (LG) layers with 5 aggregators boards• 2 PIXEL (HG) layers with individual readout

Final structure:• 22 Modules
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FoCal–E Detector

Single E-PAD board: V1 and V2
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FoCal–E Demostrator

Final module:

Demonstrator module:• 18 5-pad layer boards (90 HGCROC with 6480 channels)• 5 Aggregator board• 18 single pad board (18 HGCROC with 1296 channels)• 1 Aggregator board
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FoCal–E my contribution
PHASE 1: Selection of the good HGCROC circuits

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FoCal–E my contribution
PHASE 2: Characterizing E-PAD V1 and V2

Evaluating the parameters of the ADC, ToA and ToT and the noise
associated to them

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PHASE 2: Characterizing E-PAD V1 and V2

Test under HV
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FoCal–E my contribution
PHASE 3: Correcting the GND issue

SPS September 2021

LPSC Grenoble November 2021
Reproduction of the issue in Lab

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FoCal–E my contribution
PHASE 3: Correcting the GND issue

Solution for the E-PAD V1

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FoCal–E my contribution
PHASE 3: Correcting the GND issue

Designing a solution for the E-PAD V2

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Conclusion• A fully functional prototype of a demonstrator for FoCal-E isunder development• New calibration algorithms are optimized• A cosmic test setup is build and will be used soon
• New beam tests of the prototype are planned (Japan, CERN)

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Conclusion

Thank you for your attention

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