Results of stability test in subcooled helium for the R&D coil of the LHD helical coil
Results of stability test in subcooled helium for the R&D coil of the LHD helical coil
复制标题
R 过冷氦气稳定性测试结果
DOI：
10.1109/tasc.2004.830675
复制
发表时间：
2004
影响因子：
1.8
通讯作者：
O. Motojima
中科院分区：
文献类型：
--
作者：
S. Imagawa;N. Yanagi;Y. Hishinuma;T. Mito;K. Takahata;H. Chikaraishi;H. Tamura;A. Iwamoto;S. Hamaguchi;K. Seo;S. Yamada;A. Nishimura;O. Motojima
大型螺旋装置的螺旋线圈是池冷超导磁体。工作电流被限制在设计电流的90%以下，因为一个正常区域在几乎相同的电流下动态传播了几次。为了评估降低温度对低温稳定性的影响，用相同的导体制作了一个R&D线圈。研究了研发线圈在饱和和过冷氦环境下的低温稳定性。通过在导体和层间间隔器之间插入加热器来启动正常区域。通过电压抽头检测传播。在4.4 K和0.12 MPa的饱和氦中，开始传播的最小电流为10.7 ~ 10.8 kA。温度越低，它越高，在研发线圈内部温度为3.5 K的过冷氦中，它超过了11.7 kA。
Helical coils of the Large Helical Device are pool-cooled superconducting magnets. The operating current is restricted below about 90% of the design current because a normal-zone has propagated dynamically at several times at almost the same current. In order to estimate the effect of lowering temperatures on the cryogenic stability, an R&D coil was made of the same conductor. The cryogenic stability of the R&D coil was examined in saturated and subcooled helium. A normal-zone was initiated by a heater inserted between the conductor and the layer to layer spacer. The propagation was detected by voltage taps. In saturated helium of 4.4 K and 0.12 MPa, the minimum current to begin propagation is 10.7 to 10.8 kA. It becomes higher at the lower temperature, and it exceeds 11.7 kA in subcooled helium of 3.5 K as a temperature inside the R&D coil.