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熔盐堆核燃料盐贮存的核临界安全分析

核技术 2024年第8期47卷 149-156页

作者：杨震戴志敏杨掌众邹杨中国科学院上海应用物理研究所上海201800 中国科学院大学北京100049 生态环境部西北核与辐射安全监督站兰州730020

熔盐堆是国际公认推荐的6种第四代反应堆型之一,可以使用液态核燃料,其核燃料生产、转运和贮存所涉及工艺过程与常规固态核燃料堆型也不同。为做好核燃料管理和核安全监管,有必要对其贮存的临界安全进行分析。本研究参考美国液态燃料熔... 详细信息

熔盐堆是国际公认推荐的6种第四代反应堆型之一,可以使用液态核燃料,其核燃料生产、转运和贮存所涉及工艺过程与常规固态核燃料堆型也不同。为做好核燃料管理和核安全监管,有必要对其贮存的临界安全进行分析。本研究参考美国液态燃料熔盐反应堆MSRE(Molten Salt Reactor Experiment)相关设计参数,通过选取液态燃料熔盐堆核燃料的贮存建模、临界参数分析、蒙特卡罗中子输运软件仿真模拟计算,分析不同因素对核燃料盐贮存的影响,总结了设计模型下干燥环境贮存、水淹环境贮存的keff值及与燃料盐总质量变化的规律。最终,得到了不同情况下次临界安全控制的质量及与对应原料盐、中间产物、考虑容器壁影响时的对比。本研究结合法律法规及核材料流转过程进行分析讨论,归纳核燃料盐核临界安全特性,从核安全监管角度首次提出了相关监督审评要点。

关键词：熔盐堆燃料盐贮存核临界安全监管

Beam dynamics design of an SP-FEL compact THz source

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Nuclear Science and Techniques 2010年第5期21卷 266-270页

作者： dai Dongdong dai zhimin Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate School Chinese Academy of Sciences Beijing 100049 China

In recent years,people are looking for a new compact THz source with high emission power,one potential choice is to build small accelerator with Smith-Purcell *** main difficulty is how to obtain high quality electron *** this paper,the beam dynamics design of a compact THz source is *** electron beam is produced by an electron gun and compressed by permanent *** electron gun is similar to the Shanghai EBIT,but permanent magnets are used,instead of the superconducting magnets in Shanghai *** this design,we can reduce the size and cost of the whole ***/Pandira was employed to simulate and optimize the magnetic *** was used to simulate the beam trajectories from the electron gun to the *** 2 centimeters around the center of longitudinal magnetic field,the calculation showed that the beam satisfies to our design aim.

关键词：动力学设计太赫兹紧凑型 FEL SP 束流永久磁铁 EBIT

On harmonic operation of Shanghai deep UV free electron laser

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Nuclear Science and Techniques 2008年第1期19卷 7-12页

作者： DENG Haixiao dai zhimin Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

By choosing parameters in the modulator, the dispersive section and the seed laser, the spatial bunching of the electron beam can be correlated to the n-th harmonic of the radiator radiation, instead of the fundamental radiation in conventional high-gain harmonic generation (HGHG). Thus, the radiator undulator is operated at high harmonic mode. In this paper, the possibility of harmonic operation of Shanghai deep ultraviolet (SDUV) free electron laser (FEL) is studied. Discussions on the principle of harmonic operation, the simulation code development, the simulation results, and the proposed experimental procedure for verification of harmonic operation at the SDUV FEL are also presented.

关键词：自由电子激光器谐波电子分子扩散

Modified model for harmonic generation free electron laser

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Nuclear Science and Techniques 2010年第1期21卷 1-6页

作者： DENG Haixiao dai zhimin Shanghai Institute of Applied Physics Shanghai 201800 China

The longitudinal modulation to the electron beam by a coherent seed laser pulse is widely used for generating fully coherent,short wavelength radiation in various harmonic generation free electron laser (FEL) *** introducing the density modulation,microstructures down to attosecond scale are produced over the distance of one seed laser *** order to take into account the microstructures in the theoretical and numerical analysis,in the frame of undulator period averaged approach,a modified model for harmonic generation FEL is developed in this *** the modified model,three harmonic generation FEL examples are investigated by employing Shanghai soft X-ray FEL (SXFEL) *** FEL schemes with ultra-high harmonic generation and ultra-short pulse,the modified model presents some interesting aspects which are helpful for understanding of radiation pulse evolution,bunching efficiency and noise propagation issues.

关键词：自由电子激光器高次谐波产生修正模型激光脉冲种子调制短波辐射密度调制激光产生

Field evolution of harmonic radiation in an HGHG FEL

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Nuclear Science and Techniques 2008年第5期19卷 266-273页

作者： DENG Haixiao LI Dongguo dai zhimin Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

As a natural character of high gain flee electron laser (FEL),harmonic radiation is regarded as the natural extensions to short *** high gain harmonic generation (HGHG) scheme,harmonic evolution may be attributed to the initial harmonic bunching,self amplification of the harmonic radiation,electron beam strongly bunched by the fundamental radiation,the faster longitudinal dynamics and the fundamental synchrotron *** is more complex than harmonic evolution in other FEL *** this paper,via theoretical analyses and three dimensional simulations,a general description of different aspects of harmonic evolution in the HGHG process is presented.

关键词：自由电子激光器谐波发生器非线性特性激光技术

Improvement on a Michelson interferometer for bunch length measurement of a femtosecond accelerator

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Nuclear Science and Techniques 2009年第1期20卷 1-4页

作者： LIN Xuling ZHANG Jianbing BEI Hua dai zhimin Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Based on the femtosecond accelerator facility at Shanghai Institute of Applied Physics (SINAP), a conventional far-infrared Michelson interferometer was built to measure the bunch length by means of optical autocorrelation. However, according to the preliminary experiment result, the resolution of interferometer is not good enough, because the mirror-driving mechanism makes the moving mirror tend to tilt or wobble as it retards. Considering of the allowable errors, we calculate the maximum allowable titling angle of the moving mirror, and discuss the alignment plan in this paper.

关键词：辐射原子核超热电子固体靶输运过程放射性

Simulation of coherent spontaneous emission in a FEL with a groove guide

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Nuclear Science and Techniques 2009年第6期20卷 321-324页

作者： LUO Feng BEI Hua LIN Xuling dai zhimin Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Based on a femtosecond linear accelerator, here we present a study of the use of a groove guide as the FEL interaction structure for high power FEL experiment. The transmission and attenuation characteristics of the dominant mode in the groove guide are discussed. And the coherent spontaneous emission in the FEL is simulated by Gover theory.

关键词：自由电子激光自发辐射指南模拟相干凹槽直线加速器激光实验

近视人群的角膜生物力学特性及其与CCT、SE、CC、年龄和bIOP的相关性

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贵州医科大学学报 2024年第3期49卷 403-408页

作者：喻露谷浩代智敏候莉娜贵州医科大学临床医学院贵州贵阳550004 安徽医科大学临床医学院安徽合肥230032

目的探讨近视人群的角膜生物力学特性及其与角膜中央厚度(CCT)、等效球镜度数(SE)、角膜曲率(CC)、年龄和生物力学矫正眼内压(bIOP)的相关性。方法近视患者321例(585眼)作为研究对象,采用可视化角膜生物力学分析仪(Corvis ST)测量角膜... 详细信息

目的探讨近视人群的角膜生物力学特性及其与角膜中央厚度(CCT)、等效球镜度数(SE)、角膜曲率(CC)、年龄和生物力学矫正眼内压(bIOP)的相关性。方法近视患者321例(585眼)作为研究对象,采用可视化角膜生物力学分析仪(Corvis ST)测量角膜中央厚度(CCT)、bIOP和11项角膜生物力学参数[第1次压平时间(A1T)、第1次压平速度(A1V)、第1次压平长度(A1L)、第2次压平时间(A2T)、第2次压平速度(A2V)、第2次压平长度(A2L)最大凹陷时间(HC-T)、最大凹陷峰距(HC-PD)、最大凹陷形变幅度(HC-DA)、最大凹陷曲率半径(HC-R)和应力-应变参数(SSI)],采用Pentacam眼前节分析仪测量CCT、3 mm区平面中心曲率(K1)、3 mm区陡中心曲率(K2)、角膜平均曲率(Km);对比两种仪器测量CCT值的差异,分析11项Corvis ST角膜生物力学参数与CCT、SE、CC、年龄和bIOP的相关性。结果两种仪器测量的CCT值存在差异(t=-12.303,P<0.001);除HC-T外,CCT与各生物力学参数均相关(P<0.05);SE与A2T、A2V、SSI呈正相关(P<0.05),与A1T、A1L、HC-PD、HC-DA呈负相关(P<0.05);K1、K2、Km分别与A1V、A2T、HC-T呈正相关(均为P<0.05),与HC-PD、HC-R呈负相关(P<0.001);K2还与HC-DA呈正相关(r=0.081,P=0.050),与SSI呈负相关(r=-0.136、P=0.001);年龄与A1V、A2T、HC-T、HC-DA、SSI呈正相关(P<0.05),与A1T呈负相关(r=-0.110、P=0.008);bIOP与A1T、A1L、A2V、HC-R、SSI呈正相关(P<0.05),与A1V、A2T、HC-T、HC-PD、HC-DA呈负相关(P<0.001)。结论近视人群的角膜生物力学特性与CCT、SE、年龄和bIOP密切相关,角膜厚度大,则生物力学稳定;随着SE增高,角膜生物力学稳定性下降。

关键词：近视角膜生物力学可视化角膜生物力学分析仪生物力学矫正眼内压应力-应变参数

THz spatial power distribution from the femtosecond linac-undulator system at SINAP

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Nuclear Science and Techniques 2009年第4期20卷 193-196页

作者： LIN Xuling ZHANG Jianbing BEI Hua LUO Feng dai zhimin Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The generation and observation of coherent THz undulator radiation from femtosecond electron bunches in Shanghai Institute of Applied Physics Femtosecond Accelerator device is *** this paper the experiment setup and f... 详细信息

关键词：加速器应用物理学放射线实验