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...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。展开更多
A neutron source driven by electron accelerator is proposed in Shanghai Institute of Applied Physics (SINAP). The facility is planned for the study of nuclear data in Thorium-Uranium cycling system, and for material r...A neutron source driven by electron accelerator is proposed in Shanghai Institute of Applied Physics (SINAP). The facility is planned for the study of nuclear data in Thorium-Uranium cycling system, and for material research. A detailed simulation of the neutron source is performed for the program to get the neutron generation maximum economically. Several parameters of the facility, which affect the neutron yield and the neutron escape from outer surface of the target, are analyzed respectively. Besides, the yielding neutron spectrum and the escaping neutron angular distribution are calculated and discussed.展开更多
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 radiation.The main difficulty is how to obtain high qualit...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 radiation.The main difficulty is how to obtain high quality electron beam.In this paper,the beam dynamics design of a compact THz source is presented.The electron beam is produced by an electron gun and compressed by permanent magnets.The electron gun is similar to the Shanghai EBIT,but permanent magnets are used,instead of the superconducting magnets in Shanghai EBIT.With this design,we can reduce the size and cost of the whole device.Poisson/Pandira was employed to simulate and optimize the magnetic field.Egun was used to simulate the beam trajectories from the electron gun to the collector.Within 2 centimeters around the center of longitudinal magnetic field,the calculation showed that the beam satisfies to our design aim.展开更多
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 autocorrel...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.展开更多
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 d...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.展开更多
文摘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。
文摘A neutron source driven by electron accelerator is proposed in Shanghai Institute of Applied Physics (SINAP). The facility is planned for the study of nuclear data in Thorium-Uranium cycling system, and for material research. A detailed simulation of the neutron source is performed for the program to get the neutron generation maximum economically. Several parameters of the facility, which affect the neutron yield and the neutron escape from outer surface of the target, are analyzed respectively. Besides, the yielding neutron spectrum and the escaping neutron angular distribution are calculated and discussed.
文摘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 radiation.The main difficulty is how to obtain high quality electron beam.In this paper,the beam dynamics design of a compact THz source is presented.The electron beam is produced by an electron gun and compressed by permanent magnets.The electron gun is similar to the Shanghai EBIT,but permanent magnets are used,instead of the superconducting magnets in Shanghai EBIT.With this design,we can reduce the size and cost of the whole device.Poisson/Pandira was employed to simulate and optimize the magnetic field.Egun was used to simulate the beam trajectories from the electron gun to the collector.Within 2 centimeters around the center of longitudinal magnetic field,the calculation showed that the beam satisfies to our design aim.
基金Supported by Major State Basic Research Development Program of China (2002CB713600)
文摘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.
文摘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.
