This study evaluates the Accelerator Physics Emulation Studio (APES) against the Strategic Accelerator Design (SAD) code for simulating single beam background processes at BEPCII‑U, with a focus on physical modeling and computational performance. In terms of physics, APES shows good agreement with SAD in scattering generation, optical functions, beam lifetimes, and loss distributions near the...
High-voltage CMOS (HV-CMOS) pixel sensors represent a promising candidate for tracking applications in future high-energy physics experiments. Building upon the established 180 nm and 130 nm process nodes, our COFFEE2 prototype has been developed in a commercial 55 nm HV-CMOS technology to further explore the performance potential of advanced CMOS processes. The COFFEE2 chip integrates not...
The increasing level of front-end integration in particle detector has placed new requirements for powering system, particularly in terms of material budget, power distribution, and system scalability. Serial powering, based on a constant current scheme with shunt-LDO regulars (SLDO), has been an attractive solution for large-scale detector systems and future collider upgrades.
This...
Accurate simulation of beam-beam interaction backgrounds, particularly the copious production of incoherent electron-positron pairs, is essential for detector design and physics analysis at the future Circular Electron Positron Collider (CEPC). However, the high computational cost of established codes such as Guinea-Pig++ presents a bottleneck for generating the large-statistics datasets...
Monolithic Active Pixel Sensors (MAPS) in advanced CMOS nodes must balance timing, power, and noise for next-generation tracking detectors. For the CEPC Inner Tracker, the system-level requirements are a timing resolution of ~3 ns and power consumption below 150 mW/cm². Within this power budget, the analog front-end (AFE) consumes the largest fraction, making its optimization the most...
Quantum-information observables offer new tools for probing collider events beyond traditional quantities such as cross sections and invariant masses. This work investigates quantum entanglement in top–antitop pairs produced via e⁺e⁻ → tt̄, using spin density matrices generated with the recently developed Density Mode framework within MadGraph5_aMC@NLO. Events were simulated at leading order...
CEPC mechanical-stability studies specify stringent ground-motion requirements, with RMS displacement integrated over 1-100 Hz of ≤4 nm for the machine-detector interface (MDI) and ≤24 nm for the collider arc, straight and RF sections. In addition to ground-borne vibration, cooling-water systems can act as a direct source of mechanical excitation in accelerator magnet systems. Previous in situ...
COFFEE3 is a 55 nm HV-CMOS pixel detector prototype developed for the CEPC inner tracker. Following previous bench tests with charge injection, laser illumination, and a 55Fe source, two beam-test campaigns were carried out at the CERN SPS in May and July 2026. Clear responses to high-energy charged particles are observed, together with temporal correlation with scintillator reference signals....
Accurate modelling of charge sharing and pixel response is essential for evaluating the performance of the Circular Electron–Positron Collider (CEPC) vertex detector, particularly for tracks at large incident angles. We present an Allpix²-based simulation and digitization workflow for TaichuPix monolithic active pixel sensors developed for CEPC, with an emphasis on the processes connecting...
A resistive heating film was developed to simulate pixel sensor and readout heat loads in the innermost layer of the vertex detector. To simplify signal routing outside the cooling chamber, two sensing configurations were designed: a flexible printed circuit (FPC) carrying 11 surface-mount PT100 sensors, and individually wired PT100 probes (manually assembled using enameled Cu wire and UV...
Silicon microstrip detectors provide high spatial resolution, reliable charge measurement, and a scalable detector architecture, making them well suited for charged-particle tracking, beam monitoring, and detector prototyping. In this work, we present the development and initial characterization of a compact silicon microstrip tracking system based on p-on-n strip sensors. Each detector module...
Utilizing advanced 55 nm HVCMOS technology, the Inner Tracker (ITK) is a key component of the AGORA detector tracking system, originally proposed for the CEPC. The ITK features a highly modular design, with each basic module integrating up to 14 sensor chips. Pending the availability of full-size chips, prototyping efforts have commenced with dummy sensors that replicate the geometric...
Particle magnetic spectrometers are essential instruments in particle physics, enabling precise measurements of the momentum, charge, time of flight, and energy of charged particles. Driven by the requirements of next-generation magnetic spectrometer experiments, the project team focuses on key technologies for high-precision semiconductor tracking detectors. The project advances the...
We present a neural-network-based method for transverse position reconstruction in strip AC-LGADs for future collider applications. Laser scans of a four-strip sensor with different inter-electrode gaps and signal intensities are used to study the reconstruction performance. Neural-network approaches are compared with conventional amplitude-based methods, with particular attention to spatial...
Modern detector systems for particle physics, such as the outer tracker (OTK) of the future CEPC detector, aim to simultaneously improve timing and spatial resolution while reducing the amount of material in the detector and simplifying its readout electronics. One possible solution is the use of RSD-LGAD sensor strips with lengths on the order of centimeters. Such sensors can provide particle...
UP bare stave design and thermal study
