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Electro-mechanical offset measurements of beam position monitors

Radiation Detection technology and Methods 2023年第2期7卷 288-296页

作者： Jun He Yanfeng Sui Yong Li Yaoyao Du Linda Yu Junhui Yue Jianshe Cao Xujian Wang Zhe Duan Ouzheng Xiao Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China

Purpose The absolute beam position measurement in the booster and storage ring of the high energy photon source(HEPS)requires the offset between the electrical and mechanical centers of the beam position monitor(BPM).Method Traditionally,an RF signal is sent to an antenna or stretched wire aligned with the vacuum chamber,and the signal at each electrode is ***,a replacement method using a vector network analyzer,which was proposed by Lambertson,does not involve mechanical alignment and can be used for electrical offset *** and conclusions The electro-mechanical offsets of booster BPMs of the HEPS were measured using the Lambertson *** result shows good agreement with the stretched wire method within a 30μm error.

关键词： Beam position monitor Mechanical center HEPS Electro-mechanical offsets

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Design of the magnets for the HEPS injector

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Radiation Detection technology and Methods 2022年第2期6卷 143-149页

作者： Wen Kang Lei Liu Yongji Yu Changjun Ning Yuan Chen Changdong Deng Xi Wu Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina

Purpose The high energy photon source(HEPS)is a diffraction-limited storage ring light source being built in Beijing,*** HEPS accelerators consist of the storage ring and its injector which includes the linac,booster and beam transport *** magnet system is one of the most important systems for the *** this paper,the field design,mechanical design and some special issues of the main magnets for the injector are *** The magnets for the linac and transport lines work at DC mode,whereas the magnets for the booster work at dynamic *** the module of OPERA/TOSCA is used to design the DC magnetic field and the module of OPERA/ELLEKTRA is used to design the dynamic magnetic *** CAD programs are used to design the mechanical structures of the *** The magnetic field simulation results of all the magnets for the injector can meet the physical requirements,the mechanical designs of all magnets are reasonable,and engineering drawings of the magnets for production are *** Both the magnetic field design and mechanical design of all magnets are satisfied with the physical requirements of the HEPS injector;the production of all magnets has been started up.

关键词： HEPS injector DC magnet Dynamic magnet Field simulation Mechanical design

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RF design and test of a high-directivity high-power waveguide directional coupler for the HEPS

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Radiation Detection technology and Methods 2022年第2期6卷 137-142页

作者： Xiang He Jing-Ru Zhang Jing-Dong Liu Hua Shi Bing-Lin Deng Xu-Jian Wang Sheng-Chang Wang Nan Gan Pi-Long Tian Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Purpose A novel high-directivity high-power waveguide directional coupler(DC)working at 2998.8 MHz is developed for the High Energy Photon *** can help the phase control system to obtain a very accurate microwave signal,which is very important to minimize the beam *** The novel reversely placed T-type coupling piece helps to obtain a high *** N-type high-vacuum feedthroughs for vacuum sealing instead of the traditional ceramic plate is beneficial to holding a higher peak *** simulation and the high-power commissioning are accomplished in the Institute of High Energy physics(IHEP),while the fabrication and the low-power test are conducted in cooperation with the *** Both the single-coupler and the dual-coupler DCs are developed with a directivity of more than 35 dB while keeping the coupling factor within 60±0.5 ***,69.4%of all the fifty-two mass produced DCs have got a directivity of more than 40 ***:The mature manufacturing process for mass production is *** novel high-directivity high-power waveguide DC can be mass produced with an actually internationally leading performance.

关键词： HEPS Directional coupler High directivity High power Mass production

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Angularity in Higgs boson decays via H→gg at NNLL'accuracy

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Chinese physics C 2025年第2期49卷 60-80页

作者： Jiawei Zhu Yujin Song Jun Gao Daekyoung Kang Tanmay Maji Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics Fudan UniversityShanghai 200433China School of Physics and Astronomy Shanghai Key Laboratory for Particle Physics and Cosmologyand Key Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics Korea UniversitySeoul 02841Korea Department of Physics National Institute of TechnologyKurukshetraHaryana 136119India

We present improved predictions of a class of event-shape distributions called angularity for a contribution from an effective operator in Higgs hadronic decay that suffers from large perturbative *** the framework of the soft-collinear effective theory,logarithmic terms of the distribution are resummed at NNLL'accuracy,for which a two-loop constant of gluon-jet function for angularity is independently determined using a fit to the fixed-order distribution at the NLO corresponding to O(a_(s)^(2))relative to the Born *** determination has reasonable agreement with the value in a recently released *** the fit,we use an asymptotic form with a fractional power conjectured from recoil corrections at one-loop order,and it improves the accuracy of determining positive values of the angularity parameter *** resummed distribution is matched to the NLO fixed-order results to make our predictions valid at all angularity *** also discuss the first and subtracted moments of angularity as a function of a that enable the extraction of information on leading and subleading nonperturbative corrections associated with gluons.

关键词： Higgs decay soft-collinear effective theory angularity resummation

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Simultaneous fluorescence and Compton scattering computed tomography based on linear polarization X-ray

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Nuclear Science and Techniques 2024年第10期35卷 41-50页

作者： Zhi-Jun Chi Hong-Ze Zhang Jin Lin Xuan-Qi Zhang Hao Ding Qi-Li Tian Zhi Zhang Ying-Chao Du Wen-Hui Huang Chuan-Xiang Tang Key Laboratory of Beam Technology of the Ministry of Education School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China Key Laboratory of Particle and Radiation Imaging of the Ministry of Education Department of Engineering PhysicsTsinghua UniversityBeijing 100084China

Purpose To propose a method for simultaneous fluorescence and Compton scattering computed tomography by using linearly polarized *** Monte Carlo simulations were adopted to demonstrate the feasibility of the proposed *** the simulations,the phantom is a polytetrafluoroethylene cylinder inside which are cylindrical columns containing aluminum,water,and gold(Au)-loaded water solutions with Au concentrations ranging between 0.5 and 4.0 wt%,and a parallel-hole collimator imaging geometry was *** light source was modeled based on a Thomson scattering X-ray *** phantom images for both imaging modalities were reconstructed using a maximumlikelihood expectation maximization *** Both the X-ray fluorescence computed tomography(XFCT)and Compton scattering computed tomography(CSCT)images of the phantom were accurately reconstructed.A similar attenuation contrast problem for the different cylindrical columns in the phantom can be resolved in the XFCT and CSCT *** interplay between XFCT and CSCT was analyzed,and the contrast-to-noise ratio(CNR)of the reconstruction was improved by correcting for the mutual influence between the two imaging *** with K-edge subtraction imaging,XFCT exhibits a CNR advantage for the *** Simultaneous XFCT and CSCT can be realized by using linearly polarized *** synergy between the two imaging modalities would have an important application in cancer radiation therapy.

关键词： X-ray fluorescence computed tomography Compton scattering computed tomography Linear polarization Thomson scattering X-ray source Monte Carlo simulation

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Vector meson’s spin alignments in high energy reactions

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Science China(physics,Mechanics & Astronomy) 2025年第1期68卷 1-16页

作者： Jin-Hui Chen Zuo-Tang Liang Yu-Gang Ma Xin-Li Sheng Qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application(MoE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation(MOE)Shandong UniversityQingdao 266237China INFN-Firenze Sesto Fiorentino FI 50019Italy Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Mechanics and Physics Anhui University of Science and TechnologyHuainan 232001China

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider(RHIC)at Brookhaven National laboratory(BNL).It provides a unique opportunity to probe the correlation between the po-larized quark and antiquark in the strongly coupled quark-gluon plasma(sQGP)produced in relativistic heavy ion collisions,opening a new window to explore the properties of *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e^(+)e^(−)annihilations at high energies where hadron production is dominated by quark fragmentation *** results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we present a brief review of theoretical and experimen-tal advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation

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Electromagnetic soliton generation in an over-dense plasma through Laser-plasma interaction: Using PIC simulation 50

Electromagnetic soliton generation in an over-dense plasma t...

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50th EPS Conference on Plasma physics, EPS 2024

作者： Kumar, Gaurav Malik, Hitendra K. Plasma Waves and Particle Acceleration Laboratory Department of Physics Indian Institute of Technology Delhi New Delhi110 016 India

ISBN: (纸本)9798331305239

During laser propagation through an over-dense plasma a huge amplitude electromagnetic soliton is shown to evolve under the impact of external magnetic field. For investigating this phenomenon, particle-in-Cell (PIC) simulations inside the EPOCH-4.17.10 framework are carried out for a finite laser pulse. While the transverse magnetic and electric fields have 1/2-cycle and 1-cycle structures, respectively, the electrostatic field inside the soliton has a 1-cycle structure in space. Soliton propagation for a longer time is shown to occur in the plasma without any changes in its structure. The soliton width grows in tandem with an increase in the temperature of both the plasma species. Such a soliton structure may be useful for particle acceleration, particle trapping, and in communication. © 2024 50th EPS Conference on Plasma physics, EPS 2024. All rights reserved.

关键词： Plasma simulation

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ISSUES RELATED TO CEPC e+/e-INJECTION

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65th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+ e- Colliders, eeFACT 2022

作者： Meng, Cai Gao, Jie Li, Xiaoping Pei, Guoxi Wang, Dou Zhang, Jingru Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy Physics Beijing China

ISBN: (纸本)9783954502363

Circular Electron-Positron Collider (CEPC) is a 100 km ring collider as a Higgs factory. It consists of a double ring collider, a full energy booster, a Linac and several transport lines. The Linac is a normal conducting S-band and C-band linear accelerator and provide electron and positron beam at an energy up to 30 GeV with repetition frequency of 100 Hz. After a conventional positron source, there is a 1.1 GeV damping ring to reduce the emittance of positron beam. C-band accelerating structures are adopted to accelerate electron and positron beam from 1.1 GeV to 30 GeV. For Z mode, in order to obtain higher injection speed, the Linac operates in double-bunch acceleration mode. The physics design and dynamic simulation results of the Linac will be detailed presented in this paper. © 2022 CERN. All rights reserved.

关键词： Germanium alloys

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Commissioning and operation of the cryostat for 3W1 SC wiggler

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Nuclear Science and Techniques 2023年第6期34卷 43-54页

作者： Miao-Fu Xu Xiang-Zhen Zhang Rui Ye Jin-Can Wang Xiao-Juan Bian Yao Gao Min-Xian Li Fu-San Chen Xiao-Chen Yang Rui Ge Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsBeijing100049China University of Chinese Academy of Sciences Beijing100049China

A 3W1 superconducting wiggler(SCW)with the pole gap of 68 mm was successfully tested and installed in a BEPC II storage ring in November,*** goal of zero liquid helium consumption was achieved,and the cryogenic system exhibited a 12%residual cooling capacity(approximately 0.69 W@4.2 K).The 3W1-SCW was set to operate at 2.49 T and has been operating for more than seven *** instances of magnet quenching occurred during the normal *** evaporated helium gas can be recycled to the helium gas recycling system when the pressure in the helium tank is higher than the parameter value(the setpoint of the pressure value is 1.2 bara).The cryogenic system can be recovered within 4 h if sufficient liquid helium is available to inject into the cryostat.

关键词： Cryostat Commissioning SC wiggler Synchrotron radiation

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Development of short prototype of dual aperture quadrupole magnet for CEPC ring

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Nuclear Science and Techniques 2023年第7期34卷 148-158页

作者： Mei Yang Fu-San Chen Ya-Feng Wu Zhuo Zhang Bao-Gui Yin Bin Na Zhan-Jun Zhang Institute of High Energy Physics Chinese Academy of SciencesBeijing 10049China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Beijing HE-Racing Technology Co. Ltd.Beijing 1000049China

Main quadrupole magnets are critical for the Circular Electron and Positron Collider(CEPC)and are specifically designed as dual aperture quadrupole(DAQ)***,the field crosstalk between the two apertures presents *** the CEPC will work at four beam energies of Z,W,Higgs and ttbar mode,the DAQ magnets will operate at four field gradients spanning from 3.18 to 12.63 T/*** first short quadrupole magnet prototype with the bore diameter of 76 mm and magnetic length of 1.0 m revealed the problems of large magnetic field harmonics and a magnetic center shift within the beam energy ***,a compensation method was proposed in this work to solve the field crosstalk *** adjusting the gap height at the middle of the two apertures,the field harmonics and magnetic center shift are significantly *** optimization,the short prototype was modified using a new *** field simulations are validated from the magnetic measurement ***,the multipole field meets the requirements of the four beam *** detailed magnetic field optimization,field harmonics adjustment,and measurement results are presented herein.

关键词： Dual aperture magnets Field measurements Crosstalk effect Quadrupole magnet Field harmonics CEPC

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