Explanipedia

Application of ensemble machine learning algorithms and filtering techniques in slow orbit feedback systems of electron storage rings Open

J. Fan, Weibin Liu, Jiuqing Wang, Yanru Wei, Yuanyuan Wei , et al. · 2025

Orbit stability is a critical performance metric for modern synchrotron radiation facilities and colliders, necessitating effective orbit correction and slow orbit feedback systems. In recent years, innovative orbit feedback methods levera…

Tempering properties of a new ultrahigh strength martensitic steel Open

Jinhong Zhong, Lujun Huang, Xue Mei Su, Jiarui Guo, Zhiyan Sun , et al. · 2025

Upgrade and First Measurements of the Fast Ion Loss Detector on the Hl-3 Tokamak Open

Yuxiao Han, J. Zhang, Jinlin Xie, Wei Chen, Hongbing Xu , et al. · 2025

Online reinforcement learning control for maintaining an optimum beam collision on an electron-positron collider Open

J. Fan, Jiuqing Wang · 2024

For double-ring colliders, it is a vital task to make the two beams meeting each other properly at the interaction point. BEPCII is a double-ring collider that operates in the decay mode, as the beam currents decrease over time, the beam o…

New analytical formula on the Touschek lifetime of the polarized electron beam in electron storage rings Open

H. Y. Fu, Z. H. Duan, Jiuqing Wang · 2024

Several analytical formulas have been developed to calculate the Touschek lifetime of beam in electron storage rings under different assumptions. Among them, Piwinski’s formula is the most general and precise for unpolarized beams, widely …

Study on Tempering Properties of a New Ultrahigh Strength Martensitic Steel Open

Jinhong Zhong, Lujun Huang, Xue Mei Su, Jiarui Guo, Zhiyan Sun , et al. · 2024

Equilibrium electron beam parameters of the High Energy Photon Source Open

Haisheng Xu, Cai Meng, Yuemei Peng, Saike Tian, Na Wang , et al. · 2023

Purpose The physics design of the High Energy Photon Source (HEPS) was finished after many times of iteration. Hereby, the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation modes in the basel…

Impedance Evaluation of Masks in the HEPS Storage Ring Open

Na Wang, Saike Tian, Jiuqing Wang · 2021

Masks are commonly used in photon light sources to protect sensitive elements from synchrotron radiations. In the ultra-low emittance rings, small aperture vacuum chambers are adopted in order to reach the very high gradient in the quadrup…

Longitudinal Impedance Measurements With Streak Camera at BEPC II Electron Storage Ring Open

Dechong Zhu, Jianshe Cao, Yanfeng Sui, Jiuqing Wang, Junhui Yue , et al. · 2021

We measure the bunch length at BEPC II electron storage ring using a dual sweep streak camera at visible light diagnostic beamline. The impedances estimated by a series R+L impedance model. Resistive impedance of R=446±21 Ω is obtained by …

Two-stage reflective self-seeding scheme for high-repetition-rate X-ray free-electron lasers Open

Guanqun Zhou, Zhengxian Qu, Yanbao Ma, W.J. Corbett, Yi Jiao , et al. · 2020

X-ray free-electron lasers (XFELs) open a new era of X-ray based research by generating extremely intense X-ray flashes. To further improve the spectrum brightness, a self-seeding FEL scheme has been developed and demonstrated experimental…

Attosecond Coherence Time Characterization in Hard X-Ray Free-Electron Laser Open

Guanqun Zhou, Franz-Josef Decker, Yuantao Ding, Yi Jiao, Alberto Lutman , et al. · 2020

Coherence time characterization method for hard X-ray free-electron lasers Open

Guanqun Zhou, Yi Jiao, T. Raubenheimer, Jiuqing Wang, Aaron J. Holman , et al. · 2020

Coherence time is one of the fundamental characteristics of light sources. Methods based on autocorrelation have been widely applied from optical domain to soft X-rays to characterize the radiation coherence time. However, for the hard X-r…

Different Optics within Large Energy Region at BEPCII Open

Chenghui Yu, Z. H. Duan, Gang Xu, Yuan Zhang, Saike Tian , et al. · 2019

BEPCII is designed at the beam energy of 1.89 GeV. According to the requirements of high energy physics, BEPCII has been operated in the energy region from 1.0 GeV to 2.3 GeV since 2009. The energy region is quite large so that it is very …

Progress of HEPS Accelerator System Design Open

Ping He, Jianshe Cao, Fusan Chen, Jinhui Chen, Haiyi Dong , et al. · 2019

The 4th generation ring-based light sources, HEPS (High Energy Photon Source) 7BA lattice has been de-veloped at IHEP. This is 6Gev, 200mA machine which has horizontal emittance Ɛh around 60pm.rad to gain the high brilliance photon beam. t…

Beam Dynamics Study in the HEPS Storage Ring Open

Yi Jiao, Xiaohao Cui, Z. H. Duan, Yuan Guo, Ping He , et al. · 2019

The High Energy Photon Source (HEPS) is the first high-energy diffraction-limited storage ring (DLSR) light source to be built in China, with a natural emittance of a few tens of pm rad and a circumference of 1360.4 m. After 10 years’ evol…

The HEPS project Open

Yi Jiao, Gang Xu, Xiaohao Cui, Z. H. Duan, Yuanyuan Guo , et al. · 2018

The High Energy Photon Source (HEPS), a 6 GeV green-field diffraction-limited storage ring light source, will be built in Beijing, China. The HEPS design has been evolving for about ten years, and is now mostly finished and ready for const…

Research of a Locally-round Beam in HEPS Storage Ring Using Solenoids Open

Chongchong Du, Jiuqing Wang · 2018

"Round beam", that is, a beam with equivalent transverse emittance, is expected for a significant fraction of the beamline users in light sources. We investigate the possibility of reaching round beam in a storage ring, by means of a local…

Evolution of the Lattice Design for the High Energy Photon Source Open

Gang Xu, Senyu Chen, Yi Jiao, Jingyi Li, Yuemei Peng , et al. · 2018

The High Energy Photon Source (HEPS) is a high-energy, ultralow-emittance, kilometer-scale storage ring light source to be built in China. The HEPS lattice design has been started since 2008. In this paper we will review the evolution of t…

Accelerator Physics Studies for the High Energy Photon Source (HEPS) in Beijing Open

Yi Jiao, Xiaohao Cui, Z. H. Duan, Yuan Guo, Daheng Ji , et al. · 2018

The High Energy Photon Source (HEPS) is the next ring-based light source with an emittance of tens of picometers, and a circumference of about 1.3 km to be built in China soon in a few years. After 10 years' evolution, the design for the H…

Incoherent Transverse Tune Shift Caused by Space-charge Effects in HEPS Storage Ring and Booster Open

Chongchong Du, Jiuqing Wang · 2017

In cases of low beam energy and high particle densities, space-charge effects become necessary discussions on transverse beam dynamics. It may cause a big enough tune shift in a circular accelerator moving the beam onto a resonance. In thi…

Status of HEPS Lattice Design and Physics Studies Open

Yi Jiao, Xiaohao Cui, Z. H. Duan, Yuan Guo, Daheng Ji , et al. · 2017

The High Energy Photon Source (HEPS) is a 6-GeV, kilometer-scale, ultralow-emittance storage ring light source to be built in Beijing, China. The HEPS is now under extensive design and study. In this report we will introduce the progress o…

Progress of the Lattice Design and Physics Studies on the High Energy Photon Source Open

Yi Jiao, Yu Sheng Bai, Xiaohao Cui, Chongchong Du, Z. H. Duan , et al. · 2017

The High Energy Photon Source (HEPS) is a 6-GeV, kilometer-scale, ultralow-emittance storage ring light source to be built in Beijing, China. In this paper we will discuss the progress of the lattice design and related physics studies on H…

The Off-Axis Injection Lattice Design of HEPS Storage Ring Open

Yuemei Peng, Daheng Ji, Yi Jiao, Saike Tian, Jiuqing Wang , et al. · 2017

The dynamic aperture size determines the injection scheme to a large extent. The aim of storage ring design of HEPS is to achieve ultralow emittances on both transverse planes. This will bring very strong lattice nonlinearities. The presen…

Progress in the Design and Related Studies on the High Energy Photon Source Open

Yi Jiao, Z. H. Duan, Yuanyuan Guo, Daheng Ji, Xiaoyu Li , et al. · 2016

The High Energy Photon Source (HEPS), a kilometer-scale diffraction-limited storage ring light source, with a beam energy of 6 GeV and a natural emittance of a few tens of pm.rad, is to be built in Beijing and now is under design. In this …

BEPCII Performance and Beam Dynamics Studies on Luminosity Open

Chenghui Yu, Z. H. Duan, Shengdong Gu, Yuan Guo, Xiyang Huang , et al. · 2016

The upgrade of the Beijing Electron Positron Collider, BEPCII, is now in a good performance for both high energy physics and synchrotron radiation experiments. The luminosity at the design energy of 1.89 GeV reached the design value 1.0*10…

Recent Physical Studies for the HEPS Project Open

Gang Xu, Z. H. Duan, Yuan Guo, Daheng Ji, Yi Jiao , et al. · 2016

The High Energy Photon Source (HEPS), a kilometre- scale storage ring light source, with a beam energy of 5 to 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. In this paper we rep…

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