CMRR中子科学平台的高压中子衍射技术及应用  

High Pressure Neutron Diffraction Technology and Applications at CMRR

作　　者：房雷鸣[1] 陈喜平[1] 谢雷[1] 贺端威[2] 胡启威 李欣 江明全 孙光爱[1] 陈波[1] 彭述明[1] 李昊[1] 韩铁鑫 FANG Leiming;CHEN Xiping;XIE Lei;HE Duanwei;HU Qiwei;LI Xin;JIANG Mingquan;SUN Guang’ai;CHEN Bo;PENG Shuming;LI Hao;HAN Tiexin(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China;Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所中子物理学重点实验室,四川绵阳621999 [2]四川大学原子与分子物理研究所,四川成都610065

出　　处：《高压物理学报》2020年第5期47-60,共14页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11427810);国家重点研发计划(2016YFA0401503);科学挑战专题(TZ2016001)。

摘　　要：中国绵阳研究堆(CMRR)建有一台专门的高压中子衍射谱仪(凤凰),用于高压科学研究。对聚焦单色器和导管升级后,凤凰谱仪的束流通量大幅度提高。基于凤凰谱仪,建立并发展了一系列高压中子技术,包括:气体压腔、活塞圆筒型压腔、紧固型压腔、标准巴黎-爱丁堡压机(VX4型)、带加热和水冷系统的两面顶压机(HP3-1500)、及压机的调节与定位系统。通过对高温高压样品腔体组装的优化设计,原位中子衍射的温度和压力最高达到34 GPa和1500℃。建立的高压中子衍射技术已成功应用于高压溶解度测量、含能材料结构表征、高压聚合反应等方面的研究。FENGHUANG diffractometer at CMRR is a neutron diffractometer dedicated for high pressure experiments.After updating the neutron guide and monochromator,now the neutron flux at the sample position can get increased up to 2.84×106 ns–1·cm–2.Based on the FENGHUANG diffractometer,comprehensive high pressure devices and techniques have been developed,such as gas cells,piston cylinders cell,clamp cell,PE press(VX4),opposite anvil press(HP3-1500)along with sample heating and cooling system,and the alignment system for high pressure devices.Moreover,with the modified high pressure and high temperature cell assemblies,the pressure can be up to 34 GPa while the temperature reaches 1500℃at maximum in the angle-dispersive neutron diffraction.Recently,some scientific research have been performed,like the solubility of NaCl at high pressure,the intergranular strain evolution of HMX,and the pressure-induced polymerization.All these experimental experiences from FENGHUANG diffractometer could not only help to promote the development of high pressure techniques on neutron scattering facilities,but also contribute to the users for their high pressure studies.

关 键 词：高压 中子衍射 巴黎-爱丁堡压机 大腔体 

分 类 号：O521.3[理学—高压高温物理] O521.2[理学—物理]