Systematic Study of Micro-stability of Superconducting Magnets

9.1紧密缠绕超导磁体的微观稳定性为了认识稳定性理论(1号文件)的适用范围，制作了两个绕组内径为90 mm的非浸渍线圈作为铜超导比的参数。对其进行了失超和加热试验，测量了其绕组电流密度和极限扰动，测量了玻璃钢成型机的热膨胀系数。9.2中金公司磁体的微观稳定性中金公司磁体的实用设计准则(文件4)被应用于NIF大型螺旋装置(LHD)的三对极向线圈。下垂直(IV-L)线圈(文件5和6)被成功地测试到额定电流20.8kA而没有失超。通过对LHD用CICC短样和双股CICC样品的测试，研究了CICC的电流分布不稳定性，并测量了极限扰动密度。9.3低温磁体的微观稳定性对低温磁体的极限扰动密度进行了分析。提出了等效扰动电流作为稳定性判据。9.4超导磁体的标度律研究了许多超导磁体绕组电流密度的储能关系，从经验和理论上得到了标度律。

9.1 Micro-stability of Tightly-wound Superconducting MagnetsIn order to recognize of the adaptable regime of the stability theory (Paper No.1), two non-impregnated coils with a winding inside diameter of 90 mm were made as parameters of copper-superconductor ratios. Their quench and heated tests were carried out, and their winding current densities and limited disturbances were measured.The coefficient of thermal expansion of a GFRP former was measured. Stability of the magnets will be analyzed by the use of this datum and strains measured by the coil tests.9.2 Micro-stability of CICC MagnetsThe practical design criterion for CICC magnets (Paper No.4) was applied to three pairs of poloidal coils for the Large Helical Device (LHD) of NIFS.The lower Inner Vertical (IV-L) Coil (Papers No.5 and No.6) was successfully tested up to the rated current of 20.8 kA without a quench. It is considered that the design criterion is reasonable and no-insulation on the conductor surface is good for stability.Short samples of CICC for LHD and two-stranded samples were tested to research current-distribution instability of CICC,and limited disturbance densities were measured.9.3 Micro-stability of Cryogenic MagnetsAnalysis of limited disturbance densities were carried out for cryogenic magnets. The equivalent current of disturbance was proposed for a stability criterion.9.4 Scaling Law for Superconducting MagnetsThe stored energy dependence of winding current densities of many superconducting magnets were investigated and the scaling laws were obtained empirically and theoretically.