组合式熔凝石英微透镜阵列-线列Yba_2Cu_3O_(7-δ)高温超导薄膜红外探测器的研究

采用准分子激光扫描消融法淀积YB32C23O7-δ高温超导薄膜,利用常规光刻工艺制备线列高温超导薄膜器件,采用离子束刻蚀制备与高温超导薄膜器件匹配的熔凝石英微透镜阵列,测试了微透镜／高温超导薄膜器件所构成的混合结构在1～5μm红外波段的几项重要的光响应特性．     

约瑟夫森阵列振荡器的相位锁定分析

系统地研究了超导亚毫米波阵列振荡器的相位锁定问题。为使超导振荡器达到高工作频率、窄线宽和高稳定的性能，约瑟夫森结与结之间的相位必须相互锁定。相位锁定可以通过结与结之间的耦合电路得以实现。通过对振荡器的各种耦合电路的比较表明，蝴蝶领结天线结构是一个比较适合约瑟夫森振荡器相位锁定的耦合电路。本文提出了一种超导亚毫米波阵列振荡器模型并对其进行了模拟计算与分析，仿真得出了振荡器各项参数值，并给出了相位锁定的条件。     

Finite element analysis of the localised thermal quench of an HTS tape

In this work, we perform a finite element method (FEM) analysis of the localised thermal quench of a high temperature superconducting (HTS) tape. One 3D thermo-electric coupling FEM model, which is constructed to address the actual development of the localised thermal quench occurred in the HTS tape, has been proposed. One quench experiment is performed to validate this model. It is shown that the mode can quantitatively reflect the dynamic and static quench characteristics when comparing the results of the experiment with the model. The FEM model generates an estimate of the location of the highest temperature and visualisation of the quench dynamics.     

低温绝缘材料的性能和超导磁体绝缘制造技术综述

低温绝缘材料的电气、力学和热特性对于超导磁体的性能和可靠性有极大的影响。总结了超导电力应用领域常用的低温绝缘材料的技术特性,以及各种绝缘材料作为超导磁体的匝间绝缘、层间绝缘、对地绝缘和引线绝缘的适用性,简要介绍了超导磁体的绝缘制造技术以及瞬时电压产生的原因。     

超导故障电流限制器的技术参数和要求的讨论

针对应用于电力系统中的各种类型的超导故障电流限制器应具有的 ,特别是有关限流的各种技术参数及要求进行了分析讨论 ,还就超导故障电流限制器参数对电力系统稳定性的影响进行了分析。     

120A超导磁体专用电源调节器

超导磁体专用电源是超导磁体系统的重要组成部分,电源的手动调节器用数字调节系统来代替,会使超导磁体励磁更加灵活方便、稳定可靠。本文叙述了该数字调节系统的软件、硬件设计和实验结果。     

Bi系2212相高温超导纤维的生长

本文报导采用激光加热小基座(LHPG)法生长出配比为Bi_2Sr(1.2)Ca_(1.2)Cu_2O_y和Bi_(2.1)Sr_(1.2)Ca_(1.1)Cu_2O_y的超导纤维.由x射线衍射分析、劳厄照相、扫描电镜、金相显微镜以及低温磁化率的观测,结果表明:用LHPG法可以生长出单相性好,织构取向明显、晶粒粗大的Bi系超导纤维。生长速度则是影响纤维结构和性能的重要因素。     

Nonequilibrium Thermodynamics of Mesoscopic Systems

The Markovian dynamics of a Brownian particle is derived in the case that the local temperature is a stochastic variable. The isolated mesoscopic particle plus environment system is analyzed in the microcanonical ensemble by means of nonlinear-process projection methods. The ensuing generalized Kramers FokkerPlanck equation involves a thermodynamic potential of mean force that is different from the canonical free energy, and the conditional entropy (or availability) emerges as the relevant steady-state potential. By coupling the system to a heat bath, we provide a microscopic foundation for the phenomenological theory of nonisothermal activation in mesoscopic systems. In the second part of this article, we then prove the existence of an availability potential governing the nonisothermal features of a Josephson junction in a SQUID, by studying the Josephson internal energy (and entropy) for T T _c in a model of two BCS superconductors coupled by a tunneling Hamiltonian. The predicted periodic dependence of the junction's T _c as a function of the flux in the SQUID has meanwhile been confirmed experimentally.     

激光溅射淀积Y-Ba-Cu-O超导薄膜

利用准分子激光束辐照Y-Ba-Cu-O超导靶体,使之元素溅射出来,喷到平行于靶面的基片之上而淀积成膜,然后通过适当的退火过程,所制薄膜在液氮温区具有超导性。制取了零电阻温度85K的高温超导薄膜;讨论了淀积条件与退火过程对薄膜超导性能的影响。     

AC losses in multilayer superconducting tapes

ac losses have been investigated experimentally as well as theoretically in tapes having on the surface several normal conducting and/or superconducting layers. The superconducting layers under investigation have been Nb₃Sn on a niobium substrate and Nb₃Ge on a stainless steel substrate. It has been proved that the layered structure of the tapes is well reflected by the stepwise character of the ac losses dependence on the amplitude of the surface magnetic field. The magnetic flux passing through a surperconducting layer or surface barrier into the inside of the tape enhances the losses in the passed barrier or layer.