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Beam-beam effects and mitigation in a future proton-proton collider

Nuclear Science and Techniques 2022年第10期33卷 90-105页

作者： Li-Jiao Wang Tanaji Sen jing-yu tang Lin-Hao Zhang Institute of High Energy Physics CASYuquan Road 19BBeijing 100049China University of Chinese Academy of Sciences CAS19A Yuquan RoadBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Fermi National Accelerator Laboratory P.O.Box 500BataviaIL 60510USA

The beam-beam effects in a hadron collider with an unprecedented energy scale were *** effects are strongly related to the attainable luminosity of the ***-range interactions were identified as the major factor limiting the dynamic aperture,which is strongly dependent on the crossing angle,β*,and bunch *** mitigation methods of the beam-beam effects were addressed,with a focus on the compensation of long-range interactions by electric curren *** CEPC-SPPC project is a two-stage large circular collider,with a first-stage circular electron-positron collider(CEPC)and a second-stage super proton-proton collider(SPPC).The design of the SPPC aims to achieve a center-of-mass energy of 75 TeV and peak luminosity of approximately 1×10^(35) cm^(-2)s^(-1).We studied the beam-beam effects in the SPPC and tested the effectiveness of the mitigation *** found that with compensation using electric current wires,the dynamic aperture is at an acceptable ***,considering the significant emittance damping in this future proton-proton collider the beam-beam effects and compensation are more complicated and are studied using long-term *** was found that with a smaller emittance,the head-on interactions with a crossing angle become more prominent in reducing the beam stability,and combined head-on and long-range compensation is needed to improve the beam *** the reduction in population owing to burnoff was included,it was found that the coupling between the transverse and longitudinal planes at smaller emittance is the main driving source of the ***,crab cavities and emittance control are also necessary than just the compensation of the long-range interactions to improve the beam *** study serves as an example for studying the beam-beam effects in future proton-proton colliders.

关键词： Particle collider Beam-beam effects Luminosity Tune footprint Dynamic aperture

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Luminosity optimization and leveling in the Super Proton-Proton Collider

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Radiation Detection Technology and Methods 2021年第2期5卷 245-254页

作者： Li Jiao Wang jing yu tang Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China

Purpose The design luminosity and the beam energy scale in the future Super Proton–Proton Collider(SPPC)are *** this article,different luminosity and leveling scenarios are studied to see if the luminosity design goal is *** The luminosity in a collider can be optimized by a group of machine parameters including beam emittance,number of bunches,bunch population,beta functions at the interaction point(IP),colliding mode(such as head-on or crossing,round or flat optics)and their changes during the colliding *** beam–beam effects,event pileup and machine turnaround time have direct impact on the *** measures or scenarios by taking the above factors are *** crab cavities are not available,the flat optics is studied to recover the luminosity lost due to a large crossing *** The luminosity patterns during the physics run and averaged luminosities are given for different luminosity *** can compare the performance potential and the technical difficulties among the *** difference between the round optics and flat optics in the case of no crab cavities is *** SPPC has a very high performance in the averaged *** luminosity optimization and leveling schemes are available to enhance the physics *** flat optics as a backup plan in the case of no crab cavities does help to improve the luminosity compared with the round optics.

关键词： Luminosity Colliding modes Event pileup Beam–beam effects Colliding optics

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A possible scheme for the surface muon beamline at CSNS

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Nuclear Science and Techniques 2019年第11期30卷 21-29页

作者： Lu-Ping Zhou Qi-Li Mu Han-Tao jing jing-yu tang yu Bao Ying-Peng Song University of Chinese Academy of Sciences Beijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Science and Technology of China Hefei 230026China Jilin University Changchun 130012China

An experimental muon source is planned for the China Spallation Neutron Source.A simplified beamline with a limited number of magnets is achieved using a FODO lattice for implementation in a future preliminary *** yield of the muon delivered to the experimental sample is slightly larger than 10^5 μ^+/s within the FWHM beam spot(-φ30 mm)from a thick muon *** addition,the beam polarization is 92%and the contamination that is mainly formed by positrons is approximately a fraction of 1%.

关键词： CSNS Polarized muon beamline Carbon target FODO lattice

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Design of the upstream decay pipe window of the long baseline neutrino facility

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Nuclear Science and Techniques 2021年第11期32卷 134-145页

作者： Hai-jing Wang Ye yuan jing-yu tang Quan Ji Ling Kang Chang-Jun Ning Ji-Lei Sun Shao-Hong Wei Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

The beam windows of high-energy beam lines are important,and it is sometimes difficult to design because it is necessary to ensure particle propagation with minimum disturbance and fulfill mechanical requirements at the same *** upstream decay pipe window of the long baseline neutrino facility at Fermilab has an extremely large diameter(1.8 m),with a thickness of only 1.5 mm to separate the helium atmosphere in the decay pipe and the nitrogen atmosphere on the other ***,the center of this dish-shaped window is expected to be a200-mm-diameter beryllium dish welded to the outside aluminum alloy A6061,and this welded combination must withstand extreme conditions of a 2.4-MW,high-energy proton beam without *** severe conditions make the design of this window an unprecedented *** paper describes the static thermal-structural analyses based on which the structure has been optimized,as well as dynamic analyses for understanding the shockwave effects originating in the *** optimization,the maximum von Mises stresses in the window decreased significantly in both normal operation and accident cases,making our design very reasonable.

关键词： Decay pipe window Structure optimization Dynamic analyses Long baseline neutrino facility

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Interface optimization of graphene paper-Cu composite prepared by electrodeposition

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Journal of Iron and Steel Research International 2024年第1期31卷 64-73页

作者： jing Guo Hai-jing Wang Shuang-juan Liu Peng Zhang jing-yu tang Wei-yang Zhang Han-jie Guo Peng-cheng Wang Cai Meng School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Advanced Technology and Materials Co. Ltd.Beijing100083China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei230027AnhuiChina

A room-temperature electrodeposition method with an organic electrolyte was developed to fabricate a HNO3-pretreated graphene paper Cu(GP'-Cu)*** improve the interfacial bonding of GP'-Cu composite,magnetron sputtering technology was used to create a"sandwich"structural gradient GP'-Cu *** selection of the intermediate transition layer metal was based on two-dimensional *** electron microscopy,X-ray photoelectron spectroscopy,and other analytical methods confirmed that the addition of an intermediate transition metal(Cr,Ni)layer reduced the gap distance and enhanced the interfacial bonding of the GP'and Cu deposited *** GP'-Ni-Cu composite exhibited the largest increase in tensile strength and *** addition,it had the highest thermal diffusivity and elongation at break among the GP'-Cu,GP'-Cr-Cu and GP'-Ni-Cu composites.

关键词： Graphene paper Two-dimensional disregistry Magnetron sputtering Metal composite

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Beamline design for multipurpose muon beams at CSNS EMuS

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Nuclear Science and Techniques 2024年第5期35卷 1-12页

作者： Yang Hong Ying-Peng Song Lu-Ping Zhou jing-yu tang Zhi-Hao Zhou Nikolaos Vassilopoulos Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China Radiotherapy Physics and Technology Center Cancer CenterWest China HospitalSichuan UniversityChengdu 610041China Xi’an Jiaotong University Health Science Center Xi’an 710049China Department of Radiation Oncology First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710049China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China

A new muon beam facility,called the Experimental Muon Source(EMuS),was proposed for construction at the China Spallation Neutron Source(CSNS).The design of the complex muon beamlines for the EMuS baseline scheme,which is based on superconducting solenoids,superferric dipoles and room-temperature magnets,is presented *** muon beams,including surface muons,decay muons and low energy muons,have been developed for multipurpose *** optics design and simulation results of the trunk beamline and branch beamlines are *** a proton beam power of 25 kW at a standalone target station that consists of a conical graphite target and high-field superconducting solenoids,the muon beam intensity in the trunk beamline varies from 10^(7)/s for surface muons to 10^(10)/s for high-momentum decay *** at the endstations,these values vary from 10^(5)/s for surface muons to 10^(8)/s for decay muons.

关键词： Surface muons Decay muons Muon beamline Superconducting solenoids Multi-channel electrostatic separator

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Conceptual design and update of the 128-channel μSR prototype spectrometer based on musrSim

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Nuclear Science and Techniques 2019年第8期30卷 50-58页

作者： Zi-Wen Pan jing-yu Dong Xiao-Jie Ni Lu-Ping Zhou jing-yu tang Daniel E.Pooley Stephen P.Cottrell Bang-Jiao Ye State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China ISIS Facility STFC Rutherford Appleton LaboratoryChiltonOxfordshire OX11 0QXUK

An experimental muon source(EMuS) will be built at the China Spallation Neutron Source(CSNS). In phase I of CSNS, it has been decided that EMuS will provide a proton beam of 5 kW and 1.6 GeV to generate muon beams. A 128-channel muon spin rotation/relaxation/resonance(μSR) spectrometer is proposed as a prototype surface muon spectrometer in a sub-branch of EMuS. The prototype spectrometer includes a detection system, sample environment, and supporting mechanics. The current design has two rings located at the forward and backward directions of the muon spin with 64 detectors per ring. The simulation shows that the highest asymmetry of approximately 0.28 is achieved by utilizing two 10-mm-thick brass degraders. To obtain the optimal asymmetry, the two-ring structure is updated to a four-ring structure with 32 segments in each ring. An asymmetry of 0.42 is obtained through the simulation, which is higher than that of all the current μSR spectrometers in the world.

关键词： EMuS μSR spectrometer 128-Channel Two-ring structure Four-ring structure Asymmetry

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Accelerated Cutaneous Wound Healing Using an Injectable Teicoplanin-loaded PLGA-PEG-PLGA Thermogel Dressing

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Chinese Journal of Polymer Science 2019年第6期37卷 548-559页

作者： Wei-Ke Xu jing-yu tang Zhang yuan Cai-yun Cai Xiao-Bin Chen Shu-Quan Cui Peng Liu Lin yu Kai-Yong Cai Jian-Dong Ding State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Key Laboratory of Biorheological Science and Technology Ministry of Education College of Bioengineering Chongqing University

Bacterial infection is a very troublesome issue in wound treatment, which stimulates exudate formation and severely delays the healing process. Herein, a thermogelling dressing system composed of two triblock copolymers of poly(D,L-lactic acid-co-glycolic acid)-b-poly(ethylene glycol)-b-poly(D,L-lactic acid-co-glycolic acid)(PLGA-PEG-PLGA) with different block lengths was developed to deliver teicoplanin(TPN), a glycopeptide antibiotic, for cutaneous wound repair. The TPN-loaded thermogel was a free-flowing sol at room temperature and formed a semi-solid gel at physiological temperature. In vitro studies demonstrated that the TPN-loaded thermogel system exhibited desired tissue adhesiveness and realized the sustained release of TPN in a fast-followed-slow manner for over three weeks. Furthermore, a full-thickness excision wound model in Sprague-Dawley(SD) rats was constructed to assess the efficacy of TPNloaded thermogel formulation. Gross and histopathologic observations implied that treatment with the thermogel formulation reduced inflammation response, promoted disposition of collagen, enhanced angiogenesis, and accelerated wound closure and maturity of SD *** combination of the bioactivity of TPN and the acidic nature of the thermogel matrix was responsible for such an enhanced wound healing process. Consequently, the TPN-loaded PLGA-PEG-PLGA thermogel is a good candidate of wound dressing for full-thickness excision wound healing.

关键词： Wound dressing PLGA-PEG-PLGA thermogel Anti-infection Teicoplanin Sustained release

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Radiation studies for the MOMENT target station

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Chinese Physics C 2016年第12期40卷 120-126页

作者： Qing-Nian XU Jian-Fei Tong Nikolaos Vassilopoulos Jun Cao Miao He Zhi-Long Hou Han-Wao jing Huai-Min Liu Xiao-Rui Lii jing-yu tang Ye yuan Guang Zhao Yang-Heng Zheng University of Chinese Academy of Sciences Beijing 100049 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Harbin Institute of Technology Harbin 150001 China

The discovery of the neutrino mixing angle θ13 opens new opportunities for the discovery of leptonic CP violation at high intensity neutrino beams. MOMENT, a future neutrino facility with a high-power proton beam of 15 MW from a continuous-wave linac, is focused on that discovery. The high power of the proton beam causes extreme radiation conditions for the facility and especially for the target station, where the pion capture system of five superconducting solenoids is located. In this paper initial studies are performed for the effects of the radiation on the solenoid structure and the area surrounding it. A concept cooling system is also proposed.

关键词： MOMENT high intensity beam neutrino target station radiation damage

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Topological properties of tetratomic Su-Schrieffer-Heeger chains with hierarchical long-range hopping

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Chinese Physics B 2023年第7期32卷 469-476页

作者：李冠强王博涵唐劲羽彭娉董亮伟 Department of Physics and Institute of Theoretical Physics Shaanxi University of Science and TechnologyXi’an 710021China

We propose a new generalized Su–Schrieffer–Heeger model with hierarchical long-range hopping based on a onedimensional tetratomic chain. The properties of the topological states and phase transition, which depend on the cointeraction of the intracell and intercell hoppings, are investigated using the phase diagram of the winding number. It is shown that topological states with large positive/negative winding numbers can readily be generated in this system. The properties of the topological states can be verified by the ring-type structures in the trajectory diagram of the complex plane. The topological phase transition is strongly related to the opening(closure) of an energy bandgap at the center(boundaries) of the Brillouin zone. Finally, the non-zero-energy edge states at the ends of the finite system are revealed and matched with the bulk–boundary correspondence.

关键词： generalized Su-Schrieffer-Heeger model tight-binding approximation topological phase transition long-range hopping winding number edge state

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