The 2023 International Workshop on the High Energy Circular Electron Positron Collider

The CEPC beam instrumentation system is composed of the current intensity measurement, beam position measurement, profile measurement system, Synchrotron r light diagnosis system, bunch length measurement system, beam loss measurement system, tune measurement system and feedback system. This talk will give a general introductin about the design principles, basic parameters, budget composition...

The Circular Electron Positron Collider (CEPC), with the low Higgs mass of ~125 GeV as a Higgs Factory, has the advantage of higher luminosity to cost ratio and the potential to be upgraded to a proton-proton collider to reach unprecedented high energy and discover New Physics. Technical Design Report (TDR) of CEPC has almost finished this year. This report focuses on the design and...

In W and Z energy modes, the CEPC collider rings can adopt off-axis injection to achieve beam accumulation. In order to meet the injection requirements of both modes, the off-axis injection kicker magnet system of the collider rings must be a trapezoidal wave pulse discharge system with the rise time and fall time less than 200ns, the amplitude and width of the trapezoidal wave pulse can be...

The CEPC Linac provides 30 GeV electrons and positrons at the exit, with a 1.1GeV positron damping ring. The RF pulse repetition frequency is 100 Hz. For Higs\ tt bar\w mode, per pulse one bunch is enough. For Z mode, double bunche per pulse is needed.
The RF system includes a bunching system and main accelerating structures. The bunching system comprises of two sub-harmonic cavities with...

This talk reports the recent progress in the design studies of polarized beams for the Circular Electron Positron Collider (CEPC). The overall design concept is outlined, followed by a few highlights in the topics of polarized positron beam generation, polarized beam acceleration in the booster, spin resonance structure in circular accelerators, and spin rotators in the electron collider ring....

In response to the low energy utilization efficiency of the RF power source system in a large particle accelerator, a high-efficiency klystron based on a multi-stage depressed collector is designed. The aim is to reduce the thermal losses of the klystron collector, thereby enhancing the overall energy efficiency of the RF power source system. This article presents the development of an energy...

Given the importance of accelerator devices, major developed and emerging countries around the world have invested significant human and material resources in the development, construction, and operation of more advanced large-scale accelerator devices. With the development of accelerator technology, the scale of accelerators is becoming larger and larger, ranging from hundreds of meters to...

The wakefield acceleration driven by high-energy particle beams has gradually sparked attention due to its extremely high single-stage gain. In particular, the lack of an effective scheme for the injection and acceleration of positrons has been a persistent issue. In this study, we utilized plasma wakefield acceleration for positron beam, delivering successful positron injection and attaining...

The energy stored in Circular Electron and Positron Collider (CEPC) is in the order of MJ, which will make the beam pipe and other equipment broken once the beam loses control. Avoiding damage to accelerator is the first priority for machine protection. There are two kinds of protection schemes. One is active protection in which an action should be triggered when a failure signal is detected,...

As an energy frontier machine, the proposed Super Proton-Proton Collider (SPPC) will have the capability to explore a much larger region of new physics models with center of energy around 125 TeV and circumference 100 km.
The nonlinearity optimization of the SPPC collider ring lattice is essential to get a high peak luminosity and lifetime of the beams. In this talk, a collider ring lattice...

The innovative concept of two-stage multi-beam Klystron has been previously investigated and studied for 1GHz, 20MW multi-beam klystron for CLIC. This technology utilizes low voltage electron beam in its first stage to compress the tube length and DC post acceleration in the 2nd stage to ensure high overall efficiency. It is very practical for the compact design at low frequencies (UHF and...