共查询到18条相似文献,搜索用时 618 毫秒
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HT-7U纵场磁体的真空压力浸渍 总被引:3,自引:0,他引:3
主要通过模拟匝间流动试验、短样试验和长样试验等 ,探求低温超导托卡马克HT 7U中纵场磁体线圈的绝缘层真空压力浸渍的工艺参数 ,确定工艺流程 ,并以模型线圈试验的电性能和液氦温度下的力学性能来验证工艺参数及工艺流程的可靠性。 相似文献
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TU—7U纵场磁体的真空压力浸渍 总被引:1,自引:0,他引:1
主要通过模拟匝间流动试验、短样试验和长样试验等,探求低温超导托卡马克HT-7U中纵场磁体线圈的绝缘层真空压力浸渍的工艺参数,确定工艺流程,并以模型线圈试验的电性能和液氦温度下的力学性能来验证工艺参数及工艺流程的可靠性。 相似文献
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研制了柱面加载压缩的液氮温区低温靶,该低温靶以液氮为冷源将样品室冷却到所需的温度,并保持该温度,然后对注入的样品气体液化,为柱面等熵压缩提供条件。根据加载方式和保温时间要求确定了低温靶的初步结构和尺寸,在此基础上分析计算了靶体的漏热、样品室的温度分布和保温时间,对结构尺寸进行优化。在自行搭建的实验台上对柱面压缩液氮低温靶的漏热、降温、温度调控及不同环境条件下的保温特性、样品气体(氩气)液化过程的温度变化进行了试验。试验结果表明:柱面压缩液氮低温靶的温度可在一定范围进行调节控制;借助样品室顶部针阀内部的温度计,结合分批充注样品气体的方法可以很好地观测样品室液体充满状况;成功地将氩气液化,充满样品室;断开冷源和真空泵后,样品室温度可以维持93 min。 相似文献
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随着我国科学技术水平的不断发展 ,在高科技领域内对低温液体的需求也越来越广泛。像液氢(Hz)、液氧 (Oz)、液氦 (He) ,液氮 (N2 )、液氩 (Ar)等低温液体 ,贮存和运输都需要容器来包装。贮存包装这些温度极低的液体是一门高科技技术 ,对温度在零下几十至几百摄氏度的低温液体都必须进行防火、防爆、防静电的安全包装。目前国内外通常采用的包装形式有高真空绝热、真空粉末绝热、真空玻纤绝热和高真空多层绝热。贮存低温液体的包装容器的材料 ,大多采用不锈钢及碳纤维复合材料来加工制造。在绝热层的外部再套上用碳钢或不锈钢加工制… 相似文献
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介绍液氦温区索尔文制冷机研究情况。利用磁性材料在从无序到有序的磁相转变时,出现比热反常增大的特性,使制冷机的制冷温度直接达到了液氦温区。图2参2。 相似文献
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氦气净化技术是国家大科学工程北京正负电子对撞机重大改造(BEPC-Ⅱ)中低温系统的关键技术之一.在充分调研国内外大型低温系统氦气净化技术的基础上,结合自身情况,创造性提出氦气储罐内部处理及真空置换方案,一次性充入氦气,将储罐内氦气不纯度控制在40 vpm之内,同时辅之以80 K外置低温吸附器对氦气储罐内以及冷箱和超导设备端的氦气进行净化.高效而又经济的解决了BEPC-Ⅱ低温系统中的氦气纯度问题,成功地进行了制冷机的验收测试和超导设备的调试及运行. 相似文献
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Two techniques are described to transport an electrically insulating cryogenic liquid or gas, typically liquid or supercritical helium between apparatus at different electrical potentials. The problem is solved in one case by applying high vacuum as simultaneous thermal and electrical insulation, and in the other case by using a potential controlled epoxy bushing as electrical insulator, installed in a cryostat which is thermally insulated in a conventional manner. 相似文献
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M.L. Mallory H.P. Hilbert H.W. Laumer 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》1985,241(1):14-16
A procedure for testing the vacuum integrity of very large stainless steel weldments used at cryogenic temperatures has been developed at Michigan State University. This development, which uses large quantities of liquid nitrogen, is a modification of a technique commonly applied to small devices and involves cooling the cryostat's liquid helium vessel (bobbin) to liquid nitrogen temperature, and then proceeding immediately with leak testing. This method was applied to the K800 superconducting magnet helium vessel, which seemed leak tight at room temperature, but was found to have an easily detectable helium leak when cooled. After repairing the leak, retesting revealed no leaks, where upon the K800 cryostat construction was completed; i.e. the bobbin was wrapped with superinsulation, a liquid nitrogen radiation shield was added, and the assembly was inserted into the vacuum jacket. The final leak test occurred when the cryostat was cooled to liquid helium temperature and was found to be helium leak tight. 相似文献