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风控热晕下复合贝塞尔高斯光束的模式串扰

光子学报 2024年第2期53卷 200-210页

作者：丁洲林于永吉李晓庆长春理工大学物理学院吉林省固体激光技术与应用重点实验室长春130022 四川师范大学物理与电子工程学院成都610068

采用多层相屏法和快速傅里叶变换法数值求解热晕方程,研究了复合贝塞尔高斯(cBG)光束大气传输过程中受热晕效应的影响。研究发现:由于热晕效应造成的光强和相位畸变,cBG光束会发生相位奇点移动和轨道角动量谱展宽,并产生模式串扰。当风... 详细信息

采用多层相屏法和快速傅里叶变换法数值求解热晕方程,研究了复合贝塞尔高斯(cBG)光束大气传输过程中受热晕效应的影响。研究发现:由于热晕效应造成的光强和相位畸变,cBG光束会发生相位奇点移动和轨道角动量谱展宽,并产生模式串扰。当风速较小时,大气介质吸收激光产生的热效应较强,导致光束的模式串扰也较强。对于初始角量子数差值较大的cBG光束,其相对串扰能量较小,受热晕效应影响导致的模式串扰较弱。此外,还研究了旋转cBG光束的热晕效应,该光束的旋转特性使其在传输过程中四周都能得到均匀的扩展。因此,相较于非旋转cBG光束,旋转cBG光束的光强分布比更均匀,模式串扰更小。并且,随着旋转cBG光束的径向波数差值的增大,模式串扰减弱。综上,增大初始角量子数差值以及径向波数差值可以有效降低cBG光束的模式串扰。

关键词：复合贝塞尔高斯光束热晕效应大气传输模式串扰

完美涡旋光束在大气湍流传输中的螺旋相位谱分析

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光学学报 2024年第6期44卷 34-41页

作者：李思瑶丁洲林侯春雨王玮君马佳欣于永吉长春理工大学物理学院吉林省固体激光技术与应用重点实验室吉林长春130022

基于Rytov近似,理论推导了完美涡旋光束(PVB)经过大气湍流水平信道后的螺旋相位谱解析表达式,研究了大气湍流中光束波长、半环宽、发射处轨道角动量(OAM)模态、光束半径、近地面折射率结构常数以及湍流系数对OAM模态探测概率和串扰概率... 详细信息

基于Rytov近似,理论推导了完美涡旋光束(PVB)经过大气湍流水平信道后的螺旋相位谱解析表达式,研究了大气湍流中光束波长、半环宽、发射处轨道角动量(OAM)模态、光束半径、近地面折射率结构常数以及湍流系数对OAM模态探测概率和串扰概率的影响。结果表明:随着发射处OAM模态、传输距离、光束半径、近地面折射率结构常数以及湍流系数的增加,经大气湍流传输后的探测概率下降;随着光束波长的增加,经大气湍流传输后的探测概率增加。此外,PVB在近场的探测概率几乎不随发射处OAM模态变化,而当光束传输到远场时,探测概率随发射处OAM模态变化明显,这是因为PVB传输到远场变成类贝塞尔光束,其光束半径随发射处OAM模态变化明显。

关键词：大气光学完美涡旋光束轨道角动量湍流大气螺旋相位谱

Measurement of the neutron total cross section of^(9)Be at the Back-n white neutron source of CSNS

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Chinese Physics C 2024年第8期48卷 140-152页

作者： Jiangbo Bai Jingyu Tang Liqun Shi Yonghao Chen Han Yi Jie Bao yu Bao Ping Cao Haolei Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Xiaolong Gao MinHao Gu Changcai Han Guozhu He Yongcheng He Yang Hong Yiwei Hu Hanxiong Huang Xiru Huang Haoyu Jiang Wei Jiang Zhijie Jiang Hantao Jing Ling Kang Bo Li Chao Li Jiawen Li Qiang Li Xiao Li Yang Li Jie Liu Shubin Liu Ze Long Guangyuan Luan Changjun Ning Mengchen Niu Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Kang Sun Zhijia Sun Zhixin Tan Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Zhaohui Wang Xiaoguang Wu Xuan Wu Likun Xie Xiaoyun Yang Li yu Tao yu yongji yu Guohui Zhang Linhao Zhang Qiwei Zhang Xianpeng Zhang yuliang Zhang Zhiyong Zhang Luping Zhou Zhihao Zhou Kejun Zhu Institute of Modern Physics Fudan UniversityShanghai 200433China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Sate Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

The neutron total cross section data of^(9)Be are essential in the nuclear structure model research of light nuclei and nuclear power *** neutron total cross section of^(9)Be in the 0.3 eV−120 MeV energy region has been measured using time-of-flight and transmission methods with the Neutron Total Cross Sectional Spectrometer(NTOX)based on the multi-cell fast fission chamber at the China Spallation Neutron Source(CSNS)-Back-n white neutron source(Back-n).The fission count-neutron energy distributions of ^(235)U and ^(238)U without samples and with Be samples with three thicknesses were measured in the double-bunch operation mode for a beam power of 100 *** Bayesian method was used to eliminate the influence of the double-bunch problem on neutron measurement in the energy region above 10 *** neutron total cross section of^(9)Be results was consistent with ENDF/B-VIII.0 evaluation library data in the 0.3 eV−20 MeV energy *** the energy ranges of 0.3 eV to 10 keV and 0.01 to 20 MeV,the deviations between our results and the evaluation results of ENDF/B-VIII.0 were within 2.5%and 15%,*** the resonance energy region,the measured resonance energies in our experiment were 0.63,0.82,and 2.8 MeV,*** results showed that the total cross section uncertainties of three Be samples were within 2.2%in the energy region below 1 *** total cross section uncertainty of 30 mm Be from ^(235)U was the smallest and less than 5%in the energy region of 0.3 eV−120 *** results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.

关键词： ^(9)Be neutron total cross section CSNS Back-n time-of-flight method transmission method multi-cell fast fission chamber

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

国防特色科研实践与多学科交叉下硕博人才培养模式研究

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高教学刊 2024年第14期10卷 19-22页

作者：于永吉李慧蔡继兴吴春婷高兰兰长春理工大学长春130022

紧跟科学领域前沿发展、紧密结合国家重大战略所需、助推未来科学发展,是高层次创新应用人才培养的关键。针对硕博人才培养在创新能力、科研水平和实践体系等方面存在的一些问题,以长春理工大学物理学专业人才培养为例,开展以培养满足... 详细信息

紧跟科学领域前沿发展、紧密结合国家重大战略所需、助推未来科学发展,是高层次创新应用人才培养的关键。针对硕博人才培养在创新能力、科研水平和实践体系等方面存在的一些问题,以长春理工大学物理学专业人才培养为例,开展以培养满足国防特色与多学科交叉相融合的硕博人才为导向,打造面向国防军工产业链的集人才培养、技术创新和实现创新成果价值能力等功能于一体的高层次高水平硕博人才培养模式研究。该研究将深化国防特色高校内涵式发展,推动我国高等教育面向“十四五”改革进程,瞄准国防科技强国建设的重大战略任务。

关键词：国防特色多学科融合创新实践科学发展硕博人才

Continuous-waveπ-polarized 1084 nm laser based on Nd:MgO:LiNbO_(3)under 888 nm thermally boosted pumping

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Chinese Optics Letters 2022年第12期20卷 32-37页

作者：赵锐雷啸天姚晓岱卢月于永吉金光勇 Jilin Key Laboratory of Solid-State Laser Technology and Application Changchun University of Science and TechnologyChangchun 130022China

A continuous-wave(CW)π-polarized 1084 nm laser based on Nd:MgO:LiNbO_(3)under 888 nm thermally boosted pumping is *** to the absorption spectrum and energy level structure of Nd:MgO:LiNbO_(3),the 888 nm laser diode(LD)is used for thermally boosted *** pumping method eliminates the quantum defect caused by the nonradiative transition in Nd:MgO:LiNbO_(3)under the traditional 813 nm pumping and effectively improves the serious thermal effect of the *** unmatched polarized 1093 nm laser is completely suppressed,and theπ-polarized laser output of1084 nm in the whole pump range is realized by the 888 nm thermally boosted *** the present work,we achieved the CWπ-polarized 1084 nm laser with a maximum output power of 7.53 W and a slope efficiency of about 46.1%.

关键词： continuous-wave laser -polarization Nd:Mgo:LiNbO_(3) thermally boosted pumping

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德余高速乌江特大桥主桥设计

世界桥梁 2023年第5期51卷 14-21页

作者：夏豪徐晖余勇继中交公路规划设计院贵州分公司贵州贵阳550001

德余高速乌江特大桥桥位处江面宽、岸坡陡,对(203+450+203)m组合梁斜拉桥和计算跨径475 m上承式钢管混凝土拱桥2个桥型方案进行比选,最终采用景观好、造价低、易养护的上承式钢管混凝土拱桥。主桥拱轴线采用悬链线,拱轴系数2.2,矢高90 m... 详细信息

德余高速乌江特大桥桥位处江面宽、岸坡陡,对(203+450+203)m组合梁斜拉桥和计算跨径475 m上承式钢管混凝土拱桥2个桥型方案进行比选,最终采用景观好、造价低、易养护的上承式钢管混凝土拱桥。主桥拱轴线采用悬链线,拱轴系数2.2,矢高90 m,矢跨比1/5.278。主拱圈由两幅拱肋组成,单幅拱肋为四肢等宽变高桁架结构,腹杆为钢箱和H形截面,竖腹杆与拱轴线中心径向布置。拱上立柱为钢箱截面,与拱肋、桥面系钢梁刚接。桥面系为槽形钢箱梁+粗骨料活性粉末混凝土桥面板的连续组合结构。拱座为梯形结构,采用扩大基础,交界墩采用变截面薄壁墩。采用斜拉扣挂、缆索吊装安装主拱节段、立柱单元及主梁构件。结构静力、稳定性计算及拱座受力验算均满足设计要求。

关键词：钢管混凝土拱桥桁架拱径向腹杆钢箱立柱槽形钢箱组合梁粗骨料活性粉末混凝土桥面板斜拉扣挂桥梁设计

Three-nanosecond-equal interval sub-pulse Nd:YAG laser with multi-step active Q-switching

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Chinese Optics Letters 2021年第7期19卷 43-47页

作者：毛洁王超洪梯翔于永吉 Jilin Key Laboratory of Solid Laser Technology and Application School of ScienceChangchun University of Science and TechnologyChangchun 130022China

We demonstrate a three-nanosecond equidistant sub-pulse multi-step Q-switched Nd:Y3 Al5 O12(Nd:YAG) *** the time interval of 100–1000 ns, three pulses with the same nanosecond interval and the same peak power are obtained at the pulse width of 24 ns, 28 ns, and 36.6 ns, *** energy is 32.5 m J, and the optical efficiency is 10.8%.The multi-step Q-switched method does not require the insertion of other optical elements into the traditional Q-switched laser, and it is very suitable to obtain pulse group output with several nanosecond pulse intervals.

关键词： nanosecond interval pulse multi-step Q-switching Nd:YAG laser

中国散裂中子源伴生质子辐照实验平台及其技术参数的确定

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现代应用物理 2024年第2期15卷 94-102页

作者：谭志新敬罕涛樊瑞睿黄良生蒋伟李强何泳成王林于永积宁常军黄蔚玲邱瑞阳曾磊孙晓阳曹秀霞马娜李论散裂中子源科学中心加速器技术部广东东莞523803 中国科学院高物理研究所东莞研究部北京100049

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(China Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测... 详细信息

为了利用负氢离子加速器中伴随产生的质子成分,中国散裂中子源(China Spallation Neutron Source,CSNS)在直线加速器末端建设了伴生质子辐照实验平台(associated protons experimental platform,APEP)。为了确定其性能参数,采用散射测量、束斑照相、同位素活化法等实验方法对伴生质子辐照实验平台的主要参数进行了刻度。实验证实,该辐照平台可以提供的质子能量范围为10~80 MeV,束斑分布均匀,束流强度范围为1.2×10^(7)~4.0×10^(9) cm^(-2)·s^(-1)。伴生质子辐照实验平台运行稳定,每年提供超过5000 h的束流时间,可以满足宇航器件可靠性测试、探测器刻度、辐照育种以及材料抗辐照特性测试等多种应用需求。

关键词：中国散裂中子源伴生质子束负氢离子能量刻度参数测试