Conveners
Poster: Group A - Accelerator and beam
- Xuan Chen (Shandong University)
- Hai Chen (Zhejiang University)
- XUHAO YUAN (IHEP, Beijing)
- Dou WANG (IHEP)
- Tao LIN (高能所)
- Miao He (IHEP)
Poster: Group B - Silicon detector
- Xuan Chen (Shandong University)
- Hai Chen (Zhejiang University)
- Tao LIN (高能所)
- Miao He (IHEP)
- Dou WANG (IHEP)
- XUHAO YUAN (IHEP, Beijing)
Poster: Group C - Other detectors and software
- Miao He (IHEP)
- Dou WANG (IHEP)
- Hai Chen (Zhejiang University)
- Tao LIN (高能所)
- Xuan Chen (Shandong University)
- XUHAO YUAN (IHEP, Beijing)
Beam-driven plasma-wakefield accelerator (PWFA) transform the energy from the leading drive bunch to a trailing witness bunch. The separation of the two bunches is in the order of 100 fs. In order to obtain high transformer ratio and long-distance acceleration PWFA, we need to precisely control the separation of the drive and witness bunch. We propose a new scheme to merge two electron bunch...
In modern particle accelerators, multiple superconducting cavities are often driven simultaneously by one high-power klystron, thereby reducing the cost of the power supplies. The CEPC RF system contains 96 cryomodules for 650 MHz 2-cell cavities. Each cryomodule contains six 650 MHz 2-cell cavities, driven by a single high-power klystron. This approach significantly reduces the cost of the...
The high-power RF power source system is the energy acquisition of particle acceleration, and is the key devices. Taking the CLIC/FCC project planned in Europe and the CEPC project planned in China as an example, the total power requirement of the RF power system is about 110 MW, which is a huge energy consumption. Therefore, it is important to explore the ways to maximize the energy...
The 650MHz/800kW CW klystron is an important component of the RF power source for the Circular Electron Positron Collider (CEPC). In order to reduce the energy demand and operating costs of the CEPC, the high efficiency klystron is developed at Institute of High Energy Physics , which is aiming to increase the efficiency of the klystrons to above 80%. In March 2020, the first prototype...
High power microwave devices, such as ceramic windows and waveguide valves, are critical components in accelerators, where safety and reliability are paramount. To ensure their safe operation, these devices must undergo rigorous high-power testing. The Traveling Wave Resonant Ring (TWRR) is an economical and efficient device used for such testing. The Institute of High Energy Physics (IHEP) is...
Superconducting quadrupole magnets in the interaction region of BEPCII-U and CEPC
This presentation will present the superconducting quadrupole magnets in the interaction region that have been manufactured for the BEPCII Upgrade (BEPCII-U) project and then describe the superconducting quadrupole magnets in the interaction region that are being designed for the Circular Electron Positron...
Design and development of CEPC control system towards EDR is introduced, including key issuses, manpower and current progress.
Based on the high efficiency klystron scheme of circular electron positron collider (CEPC), the depressed collector design is proposed to improve the overall efficiency of RF power source. The depressed collector technology has been applied in low power microwave electronic vacuum devices such as TWT and TV communication klystrons. The velocity of electrons entering the klystron collector is...
The cost of large particle accelerator devices is expensive (up to billions), and the operating energy consumption is huge (hundreds of megawatts). Green, environmental economics and sustainability are hot topics in accelerator research. For the CEPC CDR/TDR, a high-efficiency RF power source system is planned. This system adopts a 1-to-1 scheme, necessitating 96 sets of 650MHz 800kW...
After the discovery of the Higgs boson at LHC, Chinese scientists have proposed a circular electron-positron collider (CEPC) and a super proton–proton collider (SPPC). The main component of the CEPC accelerator complex is the collider ring, booster, damping ring and Linac which has a circumference of 100 kilometers. The Linac's primary high-power RF components consist of 33 units of 80 MW...
The High Energy Photon Source (HEPS) Linac is a normal conducting electron linear accelerator capable of producing high bunch charge beam. Its bunching system includes two Sub-harmonic buncher (SHB), one pre-buncher, one buncher, and one accelerating structure. To achieve high bunch charge beam, it is often necessary for the electron gun to operate with high current and long pulse, which...
To reduce energy consumption and cost has become a prime objective of the development and operation of high energy particle accelerators. RF sources are major energy consumption components of any RF system for the particle colliders. The 30 GeV injector linear accelerator (LINAC) for the CEPC (Circular Electron and Positron Collider) requires S-band klystrons with higher efficiency to reduce...
Improving the efficiency of the klystron can significantly reduce the operational costs of particle accelerators. This paper investigates the use of permanent magnets in klystrons, aiming to create a design that minimizes energy usage while maintaining performance. The focus of this study is on the design of a periodic permanent magnet (PPM) for S band high efficiency klystron. In addition to...
The CEPC high-voltage direct current (HVDC) power supply and the klystron are connected via a long-distance HVDC cable. When an arc short circuit occurs in the klystron, the energy generated by the discharge of the distributed capacitance in the long-distance transmission cable can directly damage the klystron. To address this, a high-voltage direct current long-distance transmission arc...
For accelerators like CEPC, which have extremely large storage rings, there is a significant issue with beam instability, making it necessary to employ feedback systems to suppress these instabilities. The damping time that feedback system can provide includes the time for signal acquisition and processing. In traditional bunch-by-bunch feedback systems, the filter processes signals that...
The CMOS strip sensor is a key component of the CEPC Inner Tracker. By extending the Python-based framework RASER (RAdiation SEmiconductoR), we have simulated the complete CMOS Strip Chip (CSC). First, we evaluated its electrical performance, including capacitance, leakage current at operating voltage, and the strip's weighting potential. Next, we simulated the CMOS readout integrated circuit,...
The hit rate study for the CEPC silicon tracking system, induced by beam background processes such as pair production, will impact irradiation, data rates, and the design of the detector, particularly for the CEPC operating in high-luminosity Z-pole mode. In addition to beam properties, the hit rate is influenced by factors such as the distribution of materials near the interaction point,...
The Circular Electron Positron Collider (CEPC) is specifically designed for in-depth studies of Higgs, W, and Z bosons, as well as heavy flavor particles. The precision tracking system is pivotal for the success of these physics studies. This presentation will delve into the software tools include fast simulation and full simulation as well as optimization standards that have been meticulously...
The AMSL0 upgrade project will add a 2-plane silicon stripe track detector layer to the original 9-layer detector of AMS. The sensitive area of new layer is about 8 square meters in total. This new layer will triple the acceptance of cosmic rays of the AMS and significantly improve its performance in identifying heavy ions. The sensitive area planes are composed of 72 ladders, including 40...
The CEPC plans to utilize a high spatial resolution, low-material, fast-readout, large-area, and cost-effective silicon-based tracker system. CMOS technology is a promising solution. Compared to hybrid silicon pixel sensors, CMOS processes enable smaller sensor sizes while maintaining a lower material budget. CMOS technology is also a potential candidate for future upgrades to other...
Technology Computer-Aided Design (TCAD) simulations were conducted on High Voltage CMOS (HV-CMOS) sensors with varying substrate resistivities. The simulations investigated how changes in substrate resistivity affect leakage current, breakdown voltage, the depletion region, and the distribution of high electric field areas within the sensor. The effects of pixel gap and p-stop on capacitance...
The LHCb experiment is planning a phase-II upgrade to accommodate the expected peak luminosity of L= 1.5×10^34 cm^(-2) s^(-1). The upgrade is scheduled to be implemented during the long shutdown 4, starting around the year 2032. The technical design report for the upgrade framework was released in 2022.
The Upstream Tracker, positioned before the LHCb magnet, plays a critical role in...
The Alpha Magnetic Spectrometer (AMS-02) detector operates on the International Space Station. It performs high precision measurements of cosmic ray composition and fluxes, searches for antimatter and dark matter. To increase the detection acceptance and improve its heavy ion identification power, the AMS collaboration plan to add a new layer (L0) of silicon tracker on top of AMS-02. The...
The transition-edge sensor (TES) is a type of thermal equilibrium superconducting detectors that offers excellent energy resolution, a wide dynamic range, and high quantum efficiency. We are developing TES microcalorimeters for Neutrino-less double beta decay (0𝜈ββ) experiments and high energy astrophysics missions.
In regular nuclear double beta decay (2𝜈ββ), two electrons are emitted...
The Large Hadron Collider (LHC) began its third run, known as Run 3, in 2023. During this phase, the LHCb detector operates at a higher instantaneous luminosity (Linst = 2 × 10³³ cm⁻² s⁻¹), which is five times greater than in Run2, and has transitioned to a full 40 MHz software trigger system. This increases the demands on the detectors significantly. To address these challenges, LHCb has...
The CEPC plans to deploy a time-of-flight (ToF) detector using AC-LGAD technology to advance its flavor physics research capabilities. AC-LGAD detectors with 100% fill factor, are designed to deliver high-precision measurements of both spatial coordinates and timing for detected particles.
AC-LGADs for CECP will be implemented as strip-type, single-layer structures and will be installed in...
Sub-100nm processes are becoming a critical trend in the development of HV-CMOS pixel detector technology. To evaluate the impact of in-pixel electronics design on HV-CMOS pixel sensor performance at these advanced process nodes, we have designed and submitted a prototype chip named COFFEE2, fabricated using a 55nm HV-CMOS process. This chip features a pixel array of 32 rows by 20 columns,...
The identification of heavy-flavored quarks and $\tau$ leptons is an important physics goal of the Circular Electron Positron Collider(CEPC). The vertex detector of the CEPC is capable of obtaining precise track parameters of charged particles in the vicinity of the Interaction Point to reconstruct the decay vertex of short-lived particles. The CEPC vertex detector adopts the CEPC-MOST2...
The AC-LGAD technology has been selected for use as the Time-of-Flight (ToF) detector and outer tracker for the Circular Electron-Positron Collider (CEPC). This ToF detector is essential for flavor physics at the CEPC, particularly for distinguishing kaons from pions in the low-energy range. The AC-LGAD-based ToF and outer tracker will be positioned between the TPC and ECAL, covering an area...
The tracking system of the fourth conceptual detector at CEPC consists of a silicon pixel vertex detector, a silicon tracker of HV-CMOS and LGAD, and a time projection chamber (TPC).
The tracking system plays an important role in tracks reconstruction and PID.
It's necessary and urgent to validate the momentum resolution, physics performance of the tracking system and even PID capacity of...
Radar is a software framework for high energy physics experiment data acquisition and online processing. The LHAASO DAQ and JUNO DAQ systems are developed based on RadarV1.0 and RadarV2.0, respectively. The data volume of CEPC is two orders of magnitude higher than that of JUNO, which puts forward higher requirements for online data processing capabilities. With reference to the data...
A huge superconducting magnet is proposed for the future detector of Circular
Electron Positron Collider (CEPC) at the Institute of High Energy Physics,Chinese Academy of Sciences (IHEP,CAS) .The design field of CEPC detector magnet is 3 Tesla, the coil length is 9.15m, and the free bore is 7.07m.An aluminium stabilized Rutherford type conductor is developed for the CEPC detector magnet.This...
Abstract: The Circular Electron Positron Collider (CEPC) presents a significant opportunity for advancing high-energy physics research, but its operation also brings about challenges related to synchrotron background radiation. This study focuses on characterizing and mitigating the synchrotron background produced within the CEPC accelerator environment. Synchrotron radiation, primarily...
The HEP software community has identified scalability, complexity, and cost as barriers to advancing high-performance computing in high-energy physics. We intend to address these issues by pulling technology from other domains, such as artificial intelligence, traditional financial technology, web3, and blockchain. By combining computational systems from other domains with existing HEP...
A large-scale low-temperature superconducting magnet is proposed for the future detector of Circular Electron Positron Collider (CEPC) at the Institute of High Energy Physics, Chinese Academy of Sciences (IHEP,CAS). The center magnetic field of the magnet is 3 Tesla, the length, inner and outer diameter of the magnet is 9.05 m, 7.07 m and 8.47 m，respectively. The length, inner and outer...
LumiBelle2 is a fast luminosity monitoring system designed to do fast luminosity feedback and machine tuning and beam parameters studies for SuperKEKB. It uses sCVD diamond detectors placed in both the electron and positron rings to measure the Bhabha scattering process at vanishing photon scattering angle. Two types of online luminosity signals are provided, Train-Integrated-Luminosity...
A global community of physicists specializing in Lepton Collider Time Projection Chambers (TPC) is working to realize an exceptional physics program at the energy-frontier, particularly for electron-positron collisions in the International Linear Collier (ILC) and the Circular Electron Positron Collider (CEPC). A large TPC prototype, tested in a 1.0 T magnetic field, accommodates up to seven...
The online monitoring system is an essential component of the data acquisition system, delivering swift, efficient, and comprehensive real-time monitoring for the readout chain. However, traditional online monitoring systems primarily rely on preset rules for data selection and inspection, which are unable to cope with complex operating conditions and large data volumes in real time. There are...
Future large high-luminosity electron-positron collid- ers such as Circular Electron Position Collider (CEPC), and Future Circular Collider (FCC-ee) require nanometre-sized beams at the interaction point (IP). The luminosity is very sensitive to the beam orbit drifts at the IP. It is essential to have a fast luminosity feedback system at the IP to maintain optimum beam collision conditions and...
The future Circular Electron-Positron Collider (CEPC) is a large-scale experimental facility designed to enable precise measurements of the Higgs boson, electroweak physics, and the top quark. For the CEPC detector system, a highly granular crystal electromagnetic calorimeter is proposed, targeting an electromagnetic energy resolution of less than 3%. This calorimeter features a homogeneous...
The future Circular Electron-Positron Collider (CEPC) is envisioned as a large-scale Higgs factory. For the CEPC detector system, a highly granular crystal electromagnetic calorimeter has been proposed to provide 5D information, incorporating x, y, z, E, and t dimensions. This calorimeter features a homogeneous structure with long crystal scintillator bars as the active material, with BGO and...
This research focuses on the particle reconstruction algorithm of the stereo crystal electromagnetic calorimeter for the Circular Electron Positron Collider (CEPC). The stereo crystal structure, as one of the design options for the CEPC electromagnetic calorimeter, possesses unique properties. It not only provides information on the energy deposition location but also reconstructs 3D cluster...
Leveraging the spiral structure of the CEPC detector barrel yoke, we have designed an innovative installation scheme. This scheme comprises three primary components: the barrel yoke module, end flange, and barrel yoke support structure. By dispensing with the auxiliary installation structure traditionally used, the barrel yoke can be installed utilizing its own end flange, thereby streamlining...
Small-Angle Bhabha Scattering is a traditional process used for high-precision luminosity measurement at electron-positron colliders, known for its clean event signature and large cross section. The Circular Electron Positron Collider (CEPC) is a Higgs factory that will produce millions of HZ events at √s=240GeV, and 0.7 trillion Z bosons at the Z-pole energy. In order to improve precision on...
The results obtained from simulations using CEPCSW are analyzed to understand the distribution of hit density on the vertex detector, providing a reference for the further design of the vertex detector.
Fullde Electronics Co., Ltd. is a manufacturer focusing on the development and production of high-reliability power supplies, the company is committed to the development of high- and low-voltage DC separated, chassis plug-in power supplies, energy storage, UPS power supplies and other special power supplies. Now the power supply products have been served in the European Organization for...
The technical design report of the CEPC reference detector is currently being compiled, in which the calorimeter section has selected the long crystal bar electromagnetic calorimeter and the scintillating glass hadron calorimeter as the baseline scheme. In order to study the impact and challenges of beam background on the performance of the existing detector design, we have developed a mixed...
