Cryogen-free 1kA-class Ic measurement system featuring an 8 T HTS magnet

11th European Conference on Applied Superconductivity

Strickland, N.M.^1 ; Hoffmann, C.^1,3 ; Wimbush, S.C.^1 ; Pooke, D.M.^2 ; Huang, T.^2 ; Lazic, Z.^2 ; Chamritski, V.^2 ; Talantsev, E.F.^1 ; Long, N.J.^1 ; Tallon, J.L.^1

Callaghan Innovation, PO Box 31310, Lower Hutt

5040, New Zealand^1

HTS-110 Ltd, PO Box 31310, Lower Hutt

5040, New Zealand^2

Ceraco Ceramic Coating GmbH, Ismaning, Germany^3

关键词: Conduction cooled;    Field angle;    Measurement system;    Measuring systems;    Metal organic;    RABiTS substrates;    Temperature rise;    Transport currents;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/2/022037/pdf
DOI  :  10.1088/1742-6596/507/2/022037

来源: IOP

【 摘 要 】

We have developed a cryogen-free critical-current (Ic) measuring system comprising a conduction-cooled 8 T HTS magnet and convection-cooled sample, both cooled by commercial cryocoolers. The sample can be rotated and transport currents of up to 800 A delivered with less than 0.5 K temperature rise during the Ic measurement. The system is automated with respect to variations in temperature (30-90 K), field (0-8 T), and field angle (0-360°). We have used this system to measure HTS wire samples, concentrating on metal-organic deposited YBCO on RABiTS substrates. Particular emphasis is given to the evolution of Icanisotropy with temperature, and the dangers of extrapolating from 77 K to 30 K.