自由电子脉塞用超导磁体系统

正 一、前言 众所周知:自由电子脉塞的波长与磁场强度有如下关系:10.7B0式中为波长(单位为mm),B0为磁场强度(单位为T)。例如4mm波长自由电子脉塞要求2.65T的磁场;2mm波长则要求5.3T的磁场。即波长愈短要求磁场愈强。目前,美苏等国在发展短波长,大功率自由电子脉塞方面,广泛采用超导磁体。我国在使用常规磁     

A Superconducting Magnet with Center Field of 10 T and φ100 mm Warm Bore

A conduction-cooled superconducting magnet with central field of 10T and warm bore of 100 mm was designed based on a Nb3Sn and two NbTi superconducting coils. At the first stage, the NbTi coils have been fabricated and tested. A two-stage 4 K Gifford-McMahon (GM) cryocooler with the second-stage power in 1W, 4.2K is used to cool the magnet from room temperature to 4 K. The superconducting magnet with the same power supply has the operating current of 116A. The magnet can be rotated with a support frame to be operated with either horizontal or vertical position. A pair of Bi-2223 high temperature superconducting current leads was employed to reduce heat leakage into 4.2K level. The NbTi coils reachto the operating current of 120A without training effect to be observed during charging of the magnet during 40 minutes charging time and generate the center field of 6.5T. The training effect in the NbTi magnet directly cool-down by cryocooler and inter-winding support structure in magnet can be remarkably improved. The superconducting magnet has been stably operated for more than 275 hours with 6.5T. In this paper, the detailed design, fabrication, stress analysis and quench protection characteristics are presented.     

信息集锦

·信息集锦· 西部大开发迈出实质性步伐　 (确定新开十大工程 ,拟定六项优惠政策 )　　据悉 ,西部大开发已迈出实质性步伐 ,确定今年新开十大工程 ,这十大工程是 :1 .西安至南京铁路西安至合肥段。2 .重庆至怀化铁路。3.西部公路建设 (包括国道主干线和国家级贫困县道路 )。4.西部地区机场建设。今年将开工建设西安咸阳国际机场 ,同时建设以成都双流机场、昆明巫家坝机场、西安咸阳机场、兰州中川机场和乌鲁木齐机场为中心的支线航空网络。5.重庆市高架轻轨交通 (较场口—新山村线路一期工程 )。6.柴达木盆地涩北—西宁—兰州天然输气管道…