Design considerations for high Tc ceramic superconductors

✍ Scribed by E.W Collings

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 969 KB
• Volume: 28
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(88)90135-x

✦ Synopsis

The flux-jump stabdlty and cryostabdlty of model conductors based on the ceramic superconductor YBa2Cu307 (YBC) are considered The higher specific heat of materials at 80 K than at 4 K guarantees a much greater admbat=c flux-jump stabdlty In fact, YBC should be ~mmune to admbatic flux jumping =n apphed fields of less than about 5 T, which accounts for most fields of practical interest As for the dynam)c flux-jump stabdity of a model metal-matrix composite, the h=gh thermal conductwity of YBC at 80 K is partly responsible for rehewng the customary requ)rement for 100/~m filaments Depending on the assumed Jc, dynamically flux-jump stable filaments can be many mdhmetres thick The general cond=t~ons for cryostabdity m composite conductors are invest=gated as the operating temperature is increased from 4 to 80 K and as, for pool boding coolant, hquid hehum is replaced by hquid mtrogen Finally, =t is pointed out that although thick conductors wdl satisfy the electrical requ=rements for stable d c operat=on, fine filamentary subdivision will always be needed to reduce a c hysteretic losses under both external-field and self-field cond)t~ons