中国科学院近代物理研究所从历次的大科学装置建设中,积累了大型真空腔体、超高/极高真空系统以及强流重离子加速器真空系统等设计经验。为了获得超高/极高真空系,从真空设备选择、材料处理、密封形式以及在线烘烤等方面形成了一套完整...中国科学院近代物理研究所从历次的大科学装置建设中,积累了大型真空腔体、超高/极高真空系统以及强流重离子加速器真空系统等设计经验。为了获得超高/极高真空系,从真空设备选择、材料处理、密封形式以及在线烘烤等方面形成了一套完整的工艺流程;在强流重离子加速器(High Intensity Heavy ion Accelerator Facility,HIAF)真空系统研制过程中,为了减小磁铁气隙尺寸,大幅度降低磁铁造价及电源运维成本,提出陶瓷内衬薄壁真空室新方法,并研制了原理性样机;为了有效控制HIAF未来运行过程中的动态真空效应,设计了束流准直器,开展了真空材料解吸率测量研究;为了解决高放射性区域真空系统的维护问题,提出了自重密封结构,同时研制了充气膨胀密封法兰;为了进一步优化高精度环形谱仪真空度,开展低温极高真空系统研究。展开更多
The vacuum inside HIAF-BRing beam tube should reach an extremely high vacuum level of 10^(-12) mbar.BPM is an important component for measuring beam profiles,and a total of 40 sets of BPM are distributed on BRing.BPM ...The vacuum inside HIAF-BRing beam tube should reach an extremely high vacuum level of 10^(-12) mbar.BPM is an important component for measuring beam profiles,and a total of 40 sets of BPM are distributed on BRing.BPM has a complex structure,which is one of the important issues to de ne whether BRing can reach extremely high vacuum.展开更多
TiZrV non-evaporable getters have been widely used to improve vacuum properties in the field of accelerators due to the excellent activation temperature[1].The ultimate vacuum and pumping capacity of TiZrV film tubes ...TiZrV non-evaporable getters have been widely used to improve vacuum properties in the field of accelerators due to the excellent activation temperature[1].The ultimate vacuum and pumping capacity of TiZrV film tubes at different activation temperatures were investigated in the experiment.The results show that the coated pipe is not activated at 180℃.The coated pipe is activated at 220℃and the ultimate vacuum is decreased by about 25%relative to the uncoated pipe,and the coated pipe enables a uniform pressure distribution therein.展开更多
The multi-filament structure material,which consists of a gold-plated tungsten wire and a polyetheretherketone ribbon braid insulated wire,was used in the synchrotron.The experiment uses the Switching Between Two Pump...The multi-filament structure material,which consists of a gold-plated tungsten wire and a polyetheretherketone ribbon braid insulated wire,was used in the synchrotron.The experiment uses the Switching Between Two Pumping Paths method(SPP method)[1]based on the small hole flow method to study the effects of outgassing rate at different baking temperature.展开更多
文摘中国科学院近代物理研究所从历次的大科学装置建设中,积累了大型真空腔体、超高/极高真空系统以及强流重离子加速器真空系统等设计经验。为了获得超高/极高真空系,从真空设备选择、材料处理、密封形式以及在线烘烤等方面形成了一套完整的工艺流程;在强流重离子加速器(High Intensity Heavy ion Accelerator Facility,HIAF)真空系统研制过程中,为了减小磁铁气隙尺寸,大幅度降低磁铁造价及电源运维成本,提出陶瓷内衬薄壁真空室新方法,并研制了原理性样机;为了有效控制HIAF未来运行过程中的动态真空效应,设计了束流准直器,开展了真空材料解吸率测量研究;为了解决高放射性区域真空系统的维护问题,提出了自重密封结构,同时研制了充气膨胀密封法兰;为了进一步优化高精度环形谱仪真空度,开展低温极高真空系统研究。
文摘目的:探讨红景天苷(Sal)对小鼠的抗血小板活性及抗血栓作用。方法: 120只小鼠随机均分为对照组(生理盐水)、阳性药组(阿司匹林100 mg/kg)、Sal低剂量组(50 mg/kg)和Sal高剂量组(100 mg/kg),雌雄各半,各组每只小鼠腹腔注射相应试剂1次/d,连续7 d;末次给药30 min时取血检测小鼠白细胞(WBC)、红细胞(RBC)、血小板计数(PLT)、平均血小板体积(MPV),凝血功能4项指标凝血酶原时间(PT)、活化部分凝血酶时间(APTT)、凝血酶时间(TT)及纤维蛋白原(FIB),采用断尾流血法检测小鼠断尾出血时间;40只雄性小鼠按上述分组方式,每组10只,腹腔注射1次/d,第5天给药30 min后腹腔注射角叉菜胶(20 mg/kg,0.1 mL/10 g),第6天、第7天持续给予Sal,分别测量并记录角叉菜胶12、24、48 h后的黑尾率以及黑尾长度。结果:各组小鼠WBC、RBC、PLT和MPV差异均无统计学意义( P> 0.05);与对照组小鼠相比,Sal高、低剂量组小鼠PT、APTT、TT及FIB差异均无统计学意义( P >0.05);阳性药组、Sal低剂量组和Sal高剂量组小鼠断尾平均出血时间分别较对照组为长( P <0.05或 P <0.01);造模12 h时,对照组小鼠黑尾率明显高于Sal高剂量组小鼠( P <0.01);造模24 h时,对照组小鼠黑尾率明显高于阳性药组和Sal高剂量组小鼠( P <0.05);在造模12 h、24 h和48 h时,与对照组小鼠相比,阳性药组、Sal低剂量组和Sal高剂量组小鼠黑尾长度均有缩短,差异有统计学意义( P <0.05或 P <0.01)。结论: Sal对血栓形成具有明显的抑制作用,其机制可能与抗血小板活性有关。
文摘The vacuum inside HIAF-BRing beam tube should reach an extremely high vacuum level of 10^(-12) mbar.BPM is an important component for measuring beam profiles,and a total of 40 sets of BPM are distributed on BRing.BPM has a complex structure,which is one of the important issues to de ne whether BRing can reach extremely high vacuum.
文摘TiZrV non-evaporable getters have been widely used to improve vacuum properties in the field of accelerators due to the excellent activation temperature[1].The ultimate vacuum and pumping capacity of TiZrV film tubes at different activation temperatures were investigated in the experiment.The results show that the coated pipe is not activated at 180℃.The coated pipe is activated at 220℃and the ultimate vacuum is decreased by about 25%relative to the uncoated pipe,and the coated pipe enables a uniform pressure distribution therein.
文摘The multi-filament structure material,which consists of a gold-plated tungsten wire and a polyetheretherketone ribbon braid insulated wire,was used in the synchrotron.The experiment uses the Switching Between Two Pumping Paths method(SPP method)[1]based on the small hole flow method to study the effects of outgassing rate at different baking temperature.
