检索结果-内蒙古大学图书馆

The Response of 3D Imaging BGO Calorimeter of DAMPE to TeV e+/e- in space

IEEE Transactions on Nuclear Science 2025年

作者： Zhao, Cong Liu, Chengming Xu, Enheng Sun, Haoran Nie, Yu Rong, Yi Wang, Guifu Yan, Mingyu Wei, Yifeng Wang, Xiaolian Xu, Zizong Zhang, Yunlong Huang, Guangshun University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics Department of Modern Physics Anhui Hefei230026 China - Sezione di Perugia PerugiaI-06123 Italy

The DArk Matter particle Explorer (DAMPE) is a space-based experiment to indirectly search for dark matter by measuring the energy spectra of high-energy cosmic ray electrons and positrons (CREs) up to 10 TeV. DAMPE possesses the capability to measure CREs at high energies, offering valuable insights into the physical origins of TeV CREs. The BGO calorimeter is the key sub-detector for precise energy measurements. In this paper, we present a new calibration method of high dynamic range readout of the BGO calorimeter. We also study the behavior of CREs beyond TeV energies in the BGO calorimeter, focusing on their shower development, which has a good electron/proton separation capability. © 1963-2012 IEEE.

关键词： Cosmic rays

来源：评论

学校读者我要写书评

暂无评论

Transverse spin correlation of back-to-back dihadrons in unpolarized collisions

引用

Physical Review D 2025年第5期111卷 054035-054035页

作者： Lei Yang Yu-Kun Song Shu-Yi Wei Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University Qingdao Shandong 266237 China School of Physics and Technology University of Jinan Jinan Shandong 250022 China

The spin correlation of back-to-back dihadrons emerges in unpolarized high-energy collision, empowering unpolarized experiments to shed light on the spin-dependent fragmentation functions. This work investigates the transverse spin correlation of back-to-back dihadrons in unpolarized e+e−, pp, and γp collisions, which serves as a novel probe of the chiral-odd fragmentation function H1T(z). We compute the transverse spin correlation at the partonic level and establish a connection with helicity amplitudes. Measuring this observable in future experiments can reveal valuable information on the hadronization of transversely polarized quarks.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Implications on the CP violation of charmless three body decays of bottom baryons from a U-spin analysis

引用

Physical Review D 2025年第5期111卷 053006-053006页

作者： Wei Wang Zhi-Peng Xing Zhen-Xing Zhao Shanghai Key Laboratory for Particle Physics and Cosmology Key Laboratory for Particle Astrophysics and Cosmology (MOE) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Southern Center for Nuclear-Science Theory (SCNT) Institute of Modern Physics Chinese Academy of Sciences Huizhou 516000 Guangdong Province China Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing Jiangsu 210023 China School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China

Motivated by recent LHCb measurements of CP violation in Λb three body decays, we conduct an analysis of CP asymmetry in three body decays of bottom baryons utilizing U-spin symmetry. We first develop a convenient representation that facilitates the incorporation of U-spin symmetry into our analysis. By integrating weak and strong phases into the derived amplitude, we obtain the CP asymmetry and establish relationships between CP asymmetries in U-spin related decay channels. With the help of experimental measurements, we provide numerical predictions for the CP asymmetries for other decay channels, particularly Ξb0→Λπ+π− under a specific scenario. Furthermore, we provide a quantity that can be used as a null test of the SU(3) symmetry and standard model. Deviations from zero would indicate potential new physics if they exceed the expected magnitude of SU(3) breaking effects. These results are valuable for CP violation measurements in baryon decays, and can be tested in future experiments.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Generation of 100-TW half-cycle zeptosecond x-ray pulses in the cascaded regime

引用

Physical Review Applied 2025年第2期23卷 024047-024047页

作者： Chengkai Li Yunliang Wang Ze Chen Youyou Kang Meiqi Sun Lipan Qin Bengt Eliasson Xueqing Yan Department of Physics School of Mathematics and Physics University of Science and Technology Beijing 100083 Beijing China SUPA Physics Department John Anderson Building University of Strathclyde Glasgow G4 0NG United Kingdom State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of High Energy Density Physics Simulations of the Ministry of Education Center for Applied Physics and Technology Peking University 100871 Beijing China Beijing Laser Acceleration Innovation Center 100871 Beijing China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 Shanxi China

The requirement for ever shorter laser pulses is endless in ultrafast science. Here we propose a mechanism to produce an ultrashort zeptosecond pulse (ZP) to break the attosecond pulse (AP) barrier, where a cascaded coherent synchrotron emission regime of high-order harmonics generation is used for the emission of a giant half-cycle ZP. As an ultraintense laser pulse interacts with the double-foil target, a relativistic electron sheet is formed by the first-foil electrons and accelerated in the transmission direction, by which a half-cycle AP is emitted. The generated half-cycle AP continues to interact with the second foil target, where another relativistic electron sheet is formed by the second-foil electrons and a giant half-cycle ZP is emitted. A theoretical model is proposed for the nanobunching mechanism of the relativistic electron sheet both in the reflection direction and in the transmission direction, and is supported by numerical simulation results. The intensity of the ZP can reach approximately 2.6×1021W/cm2, with a duration of 380zs, which corresponds to a power reaching the 100-TW level. This ultraintense ZP will open the door for nuclear excitation, intranuclear dynamics, or vacuum physics studies on the zeptosecond timescale.

关键词： Ultrashort pulses

来源：评论

学校读者我要写书评

暂无评论

Method study of parameter choice for a circular proton–proton collider

引用

Chinese physics C 2016年第1期40卷 103-109页

作者：苏峰高杰肖铭王逗王毅伟白莎边天剑 Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of Sciences

In this paper we show a systematic method of appropriate parameter choice for a circular proton-proton collider by using an analytical expression for the beam beam tune shift limit, starting from a given design goal and technical limitations. A suitable parameter space has been explored. Based on the parameter scan, sets of appropriate parameters designed for a 50 km and 100 km circular proton proton collider are proposed.

关键词： circular proton-proton collider parameter choice beam-beam tune shift limit

来源：评论

学校读者我要写书评

暂无评论

RF tuning and beam commissioning of CW RFQ for China-ADS Injector-I

引用

Nuclear Science and Techniques 2018年第10期29卷 182-190页

作者： Hua Shi Huafu Ouyang Shengchang Wang Ningchuang Zhou Gang Wu Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy Physics Chinese Academy of Sciences

A 325-MHz continuous-wave(CW) four-vane radiofrequency quadrupole(RFQ) is employed in Injector-I of the China Accelerator-Driven Subcritical System. The radiofrequency tuning and beam commissioning were performed from January 2014 to January 2017. In a cold test, a stability study showed that the design of the segmented resonantly coupling and dipole stabilizer rods can shift the harmful quadrupole and dipole mode from the fundamental mode to above 2.6 MHz. We also found a simplified tuning method for the field unflatness, involving changing the inserted length of a few plug tuners. For achieving CW-beam commissioning, two full-size RFQs were constructed successively. The commissioning results indicate that the beam transmission rate decreased by approximately 3% as the normalized field unflatness decreased by 1%. A 10-MeV CW proton beam with an average beam current of 2.1 m A was achieved at the target of Injector-I, and the output beam energy of the RFQ was3.18 MeV.

关键词： RFQ RF tuning CW-beam commissioning beam transmission rate

来源：评论

学校读者我要写书评

暂无评论

The Feasibility Study of the GeV-Energy Muon Source Based on HIAF

arXiv

引用

arXiv 2025年

作者： Xu, Yu Zhang, Xueheng Yu, Yuhong Yu, Pei Deng, Li Zhai, Jiajia Chen, Liangwen Zhao, He Sheng, Lina Shen, Guodong Pan, Ziwen Li, Qite Zhou, Chen Li, Qiang Yang, Lei Sun, Zhiyu Advanced Energy Science and Technology Guangdong Laboratory Huizhou516000 China Institute of Modern Physics CAS Lanzhou730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China

Generating a mono-energetic, high-energy muon beam using accelerator facilities can be very attractive for many purposes, for example, improving muon tomography currently limited by the low flux and wide energy spread of cosmic ray muons, and searching for muon related new physics beyond the Standard Model. One potential accelerator facility is the High Intensity Heavy-Ion Accelerator Facility (HIAF), which is currently under construction in Huizhou City, China. Considering the projectile energy and beamline length, a high-intensity and GeV-energy muon flux could be produced and delivered by the High Energy Fragment Separator beamline of the HIAF facility. In this paper, the flux intensity and purity of muon beam based on HIAF are discussed in detail. For the µ+ beam, the highest muon yield reaches 8.2×106 µ/s with the purity of approximately 2% at a momentum of 3.5 GeV/c;meanwhile, for the µ− beam, the maximum muon yield is 4.2 ×106 µ/s with the purity of around 20% at a momentum of 1.5 GeV/c. The results also indicate that, for muon beams with an energy of several GeV, by applying a suitable purification strategy, we can get a muon beam with a purity of 100% and an intensity of the order of 105 µ/s. © 2025, CC0.

关键词： Heavy ions

来源：评论

学校读者我要写书评

暂无评论

Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

引用

Chinese physics C 2015年第5期39卷 86-91页

作者：黄玺洋焦毅徐刚崔小昊 Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of Sciences

The coherent synchrotron radiation （CSR） effect emittance dilution in high-brightness light sources and linear in a bending path plays an important role in transverse colliders, where the electron beams are of short bunch length and high peak current. Suppression of the emittance growth induced by CSR is critical to preserve the beam quality and help improve the machine performance. It has been shown that the CSR effect in a double-bend achromat （DBA） can be analyzed with the two-dimensional point-kick analysis method. In this paper, this method is applied to analyze the CSR effect in a triple-bend achromat （TBA） with symmetric layout, which is commonly used in the optics designs of energy recovery linacs （ERLs）. A condition of cancelling the CSR linear effect in such a TBA is obtained, and is verified through numerical simulations. It is demonstrated that emittance preservation can be achieved with this condition, and to a large extent, has a high tolerance to the fluctuation of the initial transverse phase space distribution of the beam.

关键词： coherent synchrotron radiation emittance growth, achromat

来源：评论

学校读者我要写书评

暂无评论

PEPX-type lattice design and optimization for the High Energy Photon Source

引用

Chinese physics C 2015年第6期39卷 104-109页

作者：焦毅徐刚 Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of Sciences

A new generation of storage ring-based light sources, called diffraction-limited storage rings（DLSR）, with emittance approaching the diffraction limit for multi-ke V photons by using multi-bend achromat lattice, has attracted worldwide and extensive studies of several laboratories, and been seriously considered as a means of upgrading existing facilities in the imminent future. Among various DLSR proposals, the PEPX design demonstrated that it is feasible to achieve sufficient ring acceptance for off-axis injection in a DLSR, by designing the lattice based on the ‘thirdorder achromat’ concept and with a special high-beta injection section. For the High Energy Photon Source（HEPS）planned to be built in Beijing, a PEPX-type lattice has been designed and continuously improved. In this paper, we report the evolution of the PEPX-type design for HEPS, and discuss the main issues relevant to the linear optics design and nonlinear optimization.

关键词： planned facilities acceptance upgrading laboratories seriously optics straight feasible deviation

来源：评论

学校读者我要写书评

暂无评论

Cavity and HOM coupler design for CEPC

引用

Chinese physics C 2016年第5期40卷 81-86页

作者：郑洪娟高杰刘振超 Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of Sciences

In this paper we will show a cavity and higher order mode （HOM） coupler designing scheme for the Circular Electron-positron Collider （CEPC） main ring. The cavity radio frequency （RF） design parameters are shown in this paper. The HOM power is calculated based on the beam parameters in the Preliminary Conceptual Design Report （Pre-CDR）. The damping results of the higher order modes （HOMs） and same order modes （SOMs） show that they reach the damping requirements for beam stability.

关键词： CEPC 650 MHz 5-cell superconducting cavity HOM coupler higher order modes Qe damping requirements

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：