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ALICE ITS3 WP4 Research
Bent Silicon Detector Research for Next-Generation Inner Tracking System
๐ขPusan National University HIPEx Lab๐ฌCERN ALICE Collaboration๐
2023.03 - 2024.01
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Research Background
The core goal of the ALICE experiment is to study the physical properties of Quark-Gluon Plasma (QGP), the state of matter just after the Big Bang. Since QGP exists only for an extremely short time before decaying into numerous particles, high spatial resolution is essential to accurately identify the decay points of heavy quarks (charm, beauty).
To achieve this, ALICE continuously pursues performance improvements of the Inner Tracking System (ITS) closest to the collision point. The ITS3 upgrade adopts a design that thins the ALPIDE silicon pixel detector and bends it into a curved surface to wrap more closely around the beam pipe.
Bent ALPIDE Chip Prototype
Date:2023.11
ALPIDE MAPS
Performance vs Curvature
CERN ALICE
Research Role & Methodology
Research Objective
Quantitatively analyze physical and electrical characteristic changes when ALPIDE chips are mechanically bent to secure data verifying ITS3 detector design stability
Prototype Design
Designed prototype equipment to precisely bend silicon chips according to various curvature radii and performed iterative testing
Performance Characterization
Measured electrical signal characteristics and noise level changes before and after bending, performed initial data analysis using C++ based ROOT framework
Technologies & Tools
- โข C++
- โข ROOT Framework
- โข Electrical Signal Measurement
- โข Noise Level Analysis
- โข Curvature Control Prototype Equipment
- โข ALPIDE Silicon Pixel Detector
- โข Electrical Characterization System
- โข Test Bench Configuration
Research Activities & Experience
- โข Performed electrical characteristic measurements at various curvature radii
- โข Gained experience in initial data analysis using C++ and ROOT framework
- โข Participated in large-scale international collaborative research project
- โข Affiliation: Pusan National University HIPEx Lab
- โข Role: Undergraduate Researcher (WP4 Team)
- โข Period: March 2023 - January 2024
- โข Collaboration: CERN ALICE International Collaboration
References
ITS3: A Monolithic Active Pixel Sensor for the ALICE Inner Tracking System Upgrade
A. Van Lysebetten et al.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 1060, 116640
Characterization of bent ALPIDE sensors for the ALICE ITS3 upgrade
ALICE Collaboration
Journal of Instrumentation, Volume 18, P01001