Research on Simulation Technology of Refrigerating Large Scale Super conducting Magnet System

制冷大型超导磁体系统仿真技术研究

• 批准号: 07555391
• 负责人: SATOH Sadao
• 金额: $ 4.86万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555391/
• 关键词: Fusion; superconducting conductor; superconducting coil; accelerator; cryogenic system; cryogenic structure; liquid helium; super fluid helium; 超伝導マグネット; ヘリウム冷却システム; 熱負荷特性; クライオスタット

A sperconducting system used in magnetic confinement fusion devices should be kept at superconducting temperature while it is excited or should be cooled down initially from room temperature to 0.4 K massive support structures . The purpose of the research is to investigate an overall cryogenic characteristics of superconducting system coupled with helium refrigerator through applying various thermal loads artificially by a dummy heater system on a real refrigerator with which the real overall characteristics of superconducting system can be simulated precisely in wide range free of various constraints accompanied in a real system . During a first year of the research project we designed and fabricated a dummy heat load generator . Since the Helium refrigerator / liquefier of the Large Helical Device has a duty to refrigerate the largest superconducting system in the world at 0.4 K , it has also a world largest class capacity and efficiency . Therefore , a size of the dummy heater system was chosen as one thirds to that of LHD superconducting system . During next years several combined operation of dummy heater with refrigerator were made and an oscillatory instability in suprecritical helium lines was observed . Initially this was thought as instability due to a density / thermal wave propagation , however , the instability was removed mostly when a room temperature gas buffer vessel was installed on a line between room temperature compressor discharge and a cold J - T valve which isolates interference between pressure oscillation by compressor and the motion of pressure regulating valve . A computer program for initial cooling down of dummy heater and refrigerator system was developed of which technology can be applied directly to LHD superconducting cryogenic system .

磁性限制融合设备中使用的脾脏系统应保持在超导温度下，或者在兴奋时应将其冷却，或者最初应从室温到0.4 K的大量支撑结构冷却。该研究的目的是研究超导系统的总体低温特性，再加上氦冰箱，通过在真实的冰箱上施加各种热载荷，通过在实际冰箱中施加各种热载荷，可以通过在实际冰箱中精确地模拟各种伴随的多种结构，从而可以准确地模拟超导系统的真实整体特征。在研究项目的第一年，我们设计并制造了一个虚拟热负荷发生器。由于大型螺旋装置的氦冰箱 /液化器有责任将世界上最大的超导系统冷藏为0.4 K，因此它也具有世界上最大的级别的能力和效率。因此，选择了假加热器系统的大小为LHD超导系统的大小三分之一。在未来的几年中，制作了虚拟加热器与冰箱的几个合并操作，并观察到氦上氦气线的振荡不稳定。最初，这被认为是由于密度 /热波传播引起的不稳定，但是，当室温气缓冲器容器安装在室温压缩机排放和冷J- T阀之间的一条线上时，将其不稳定去除，从而在压缩机和压力调节阀的运动中隔离压力振荡之间的干扰。开发了用于最初冷却的植物加热器和冰箱系统的计算机程序，其中可以将技术直接应用于LHD超导性低温系统。

项目成果

Toshiyuki Mito et.al.: "Cryogenic Control System for the Large Helical Device"proc. 16th ICEC Kitakyusyu. 79 (1997)

Toshiyuki Mito 等人：“大型螺旋装置的低温控制系统”proc。

Toshiyuki Mito et al.: "Cryogenic Control System For The Louge Helical Device"Proc. 16th Int. Cryogenic Engineering Conference. Part 1. 79-82 (1997)

Toshiyuki Mito 等人：“Louge 螺旋装置的低温控制系统”Proc。

Sadao Satoh et al: "Desigu and Construction of Cryogenic Components for LHD"Proc. 16th Int. Cryogenic Engineering Conference. Part 1. 63-63 (1997)

Sadao Satoh 等人：“LHD 低温组件的设计和构建”Proc。

R. Maekawa et al.: "Study of Optimum Operating Condition for the Helium Refrigeration System for the LHD with a Dummy Load Apparatus"Proc. 16th Int. Cryogenic Engineering Conference. Part 1. 87-90 (1997)

R. Maekawa 等人：“带有假负载装置的 LHD 氦制冷系统最佳运行条件的研究”Proc。

Sadao Satoh et.al.: "Design and Construction of Cryogenic Components for LHD"proc. 16th ICEC Kitakyusyu. 63 (1997)

Sadao Satoh 等人：“LHD 低温组件的设计和构造”proc。