氚增殖包层中产氚率测量是聚变核能系统中需要研究的重要问题之一。本文开展了用于产氚率测量的碳酸锂探测片液闪样品制备方法的研究。结果表明:采用盐酸溶解碳酸锂探测片的方式,能制备成无色、透明度高且无分层的液闪样品,相比其他混...氚增殖包层中产氚率测量是聚变核能系统中需要研究的重要问题之一。本文开展了用于产氚率测量的碳酸锂探测片液闪样品制备方法的研究。结果表明:采用盐酸溶解碳酸锂探测片的方式,能制备成无色、透明度高且无分层的液闪样品,相比其他混酸处理,这种方法减少了寻找混酸间最佳体积比的步骤,简化了碳酸锂探测片液闪样品制备流程。对完善制备方法的研究表明:在20 m L的液闪测量瓶中,闪烁液的体积至少为10 m L以上;碳酸锂探测片刚好溶解后,盐酸用量不能超过0.2 m L(部分不超过0.4 m L)。该方法制备的液闪样品的兼容性在较长时间是稳定存在的,但淬灭程度会有较大变化,需考虑淬灭程度的变化对氚测量的影响。展开更多
A 2.45 GHz electron cyclotron resonance intense proton source and a low energy beam transport line with dual-Glaser lens were designed and fabricated by Institute of Modern Physics for a compact pulsed hadron source a...A 2.45 GHz electron cyclotron resonance intense proton source and a low energy beam transport line with dual-Glaser lens were designed and fabricated by Institute of Modern Physics for a compact pulsed hadron source at Tsinghua. The intense proton beams extracted from the ion source are transported through the transport line to match the downstream radio frequency quadrupole accelerator. Particle-in-cell code BEAMPATH was used to carry out the beam transport simulations and optimize the magnetic field structures of the transport line. Emittance growth due to space charge and spherical aberrations of the Glaser lens were studied in both theory and simulation. The results show that narrow beam has smaller aberrations and better beam quality through the transport line. To better match the radio frequency quadrupole accelerator, a shorter transport line is desired with sufficient space charge neutralization.展开更多
Septum magnet is one of the key components of synchrotron injection and extraction system.Because the excitation current flows through the septum plate coil,the excitation current is subjected to a large electromagnet...Septum magnet is one of the key components of synchrotron injection and extraction system.Because the excitation current flows through the septum plate coil,the excitation current is subjected to a large electromagnetic force.At the same time,under the limitation of the septum plate size,the leakage field has an effect on the circulating beam near the septum plate^([1]).There are several septum magnets in the HIAF accelerator complex,so the shielding structure needs to be optimized and analyzed to further reduce the losses caused by magnetic leakage.展开更多
A reliable ^(235)U enrichment uniformity detection system based on a compact D–D neutron generator is developed to detect the ^(235)U enrichment uniformity of different fuel elements in the same nuclear fuel rod. The...A reliable ^(235)U enrichment uniformity detection system based on a compact D–D neutron generator is developed to detect the ^(235)U enrichment uniformity of different fuel elements in the same nuclear fuel rod. The high-yield compact D–D neutron generator provides 2.45 MeV D–D neutrons, decelerated by a moderator to thermal neutrons or epithermal neutrons, thereby inducing ^(235)U fission to produce highly excited state fission fragments that undergo de-excitation via γ-ray emission. The system detects the ^(235)U enrichment uniformity of a nuclear fuel rod by measuring γ-rays and establishing a relationship between the γ-ray count rate and ^(235)U enrichment in nuclear fuel. The proposed system yields a confidence probability of 99.99% for a relative ^(235)U enrichment deviation of 10% and a neutron yield of 5 × 10^(8) n/s, and the detection accuracy increases with increasing neutron yield. Furthermore, the developed system can satisfy quality control requirements for nuclear fuel production to promote the safe development of nuclear power.展开更多
文摘氚增殖包层中产氚率测量是聚变核能系统中需要研究的重要问题之一。本文开展了用于产氚率测量的碳酸锂探测片液闪样品制备方法的研究。结果表明:采用盐酸溶解碳酸锂探测片的方式,能制备成无色、透明度高且无分层的液闪样品,相比其他混酸处理,这种方法减少了寻找混酸间最佳体积比的步骤,简化了碳酸锂探测片液闪样品制备流程。对完善制备方法的研究表明:在20 m L的液闪测量瓶中,闪烁液的体积至少为10 m L以上;碳酸锂探测片刚好溶解后,盐酸用量不能超过0.2 m L(部分不超过0.4 m L)。该方法制备的液闪样品的兼容性在较长时间是稳定存在的,但淬灭程度会有较大变化,需考虑淬灭程度的变化对氚测量的影响。
基金Supported by the Compact Pulsed Hadron Source (CPHS) project at Tsinghua UniversityNational Nature Science foundation of China (11027508)
文摘A 2.45 GHz electron cyclotron resonance intense proton source and a low energy beam transport line with dual-Glaser lens were designed and fabricated by Institute of Modern Physics for a compact pulsed hadron source at Tsinghua. The intense proton beams extracted from the ion source are transported through the transport line to match the downstream radio frequency quadrupole accelerator. Particle-in-cell code BEAMPATH was used to carry out the beam transport simulations and optimize the magnetic field structures of the transport line. Emittance growth due to space charge and spherical aberrations of the Glaser lens were studied in both theory and simulation. The results show that narrow beam has smaller aberrations and better beam quality through the transport line. To better match the radio frequency quadrupole accelerator, a shorter transport line is desired with sufficient space charge neutralization.
文摘Septum magnet is one of the key components of synchrotron injection and extraction system.Because the excitation current flows through the septum plate coil,the excitation current is subjected to a large electromagnetic force.At the same time,under the limitation of the septum plate size,the leakage field has an effect on the circulating beam near the septum plate^([1]).There are several septum magnets in the HIAF accelerator complex,so the shielding structure needs to be optimized and analyzed to further reduce the losses caused by magnetic leakage.
基金This work was supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.12075105,11705071 and 11875155)the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics(Grant No.U1830102)+1 种基金the NSFC-Nuclear Technology Innovation Joint Fund(Grant No.U1867213)the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2021-kb09)。
文摘A reliable ^(235)U enrichment uniformity detection system based on a compact D–D neutron generator is developed to detect the ^(235)U enrichment uniformity of different fuel elements in the same nuclear fuel rod. The high-yield compact D–D neutron generator provides 2.45 MeV D–D neutrons, decelerated by a moderator to thermal neutrons or epithermal neutrons, thereby inducing ^(235)U fission to produce highly excited state fission fragments that undergo de-excitation via γ-ray emission. The system detects the ^(235)U enrichment uniformity of a nuclear fuel rod by measuring γ-rays and establishing a relationship between the γ-ray count rate and ^(235)U enrichment in nuclear fuel. The proposed system yields a confidence probability of 99.99% for a relative ^(235)U enrichment deviation of 10% and a neutron yield of 5 × 10^(8) n/s, and the detection accuracy increases with increasing neutron yield. Furthermore, the developed system can satisfy quality control requirements for nuclear fuel production to promote the safe development of nuclear power.
