Title :
A Test System for Superconducting Joints Based on GM Cryocooler
Author :
Dongsheng Ni ; Wenjie Yang ; Shaofei Han ; Li Zhu ; Xiang Zhang ; Beimin Wu ; Lizhen Ma
Author_Institution :
Inst. of Modern Phys., Lanzhou, China
Abstract :
A helium-free superconducting joints test system based on a 1.5 W GM cryocooler has been built in the Institute of Modern Physics, CAS. The resistance and the critical-current of a joint at a particular magnetic field and a particular temperature can be measured synchronously. This system consists of a device on the second stage of the cryocooler and an instrumentation system. The basic method of this system is inductive technique and the current-decay method. The main components of the device include a drive coil, a sample holder, and a background magnet. The measurement process is operating by a LabView program. It has been used to test the NbTi wire joints of the Lanzhou penning trap magnet; it seems reliable and convenient. The principles of main design and some results are presented in this paper.
Keywords :
critical currents; electric resistance; instrumentation; multifilamentary superconductors; niobium alloys; particle traps; titanium alloys; GM cryocooler; LabView program; Lanzhou penning trap magnet; NbTi; NbTi wire joints; background magnet; cryocooler second stage; current-decay method; design principles; device components; drive coil; helium-free superconducting joint test system; inductive technique; instrumentation system; joint critical-current; joint resistance; magnetic field; measurement process; power 1.5 W; sample holder; Coils; Current measurement; Joints; Magnetic field measurement; Resistance; Superconducting magnets; Temperature measurement; Critical current; Penning trap; cryocooler; resistance; superconducting joint; test;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2285785
