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Titolo:
A METHOD TO EVALUATE CRACKS IN A SUPERCONDUCTIVE CYLINDER USED TO SHIELD WEAK MAGNETIC-FIELDS
Autore:
YAMAZAKI S; NEGISHI T; NAKANE H; HAYASHI N; YOSHIZAWA S;
Indirizzi:
KOGAKUIN UNIV,DEPT ELECT ENGN TOKYO 192 JAPAN SUPERCOND SENSOR LAB TOKYO JAPAN DOWA MIN CO LTD TOKYO JAPAN
Titolo Testata:
IEEE transactions on instrumentation and measurement
fascicolo: 4, volume: 46, anno: 1997,
pagine: 873 - 876
SICI:
0018-9456(1997)46:4<873:AMTECI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Keywords:
CYLINDER; IMPEDANCE MEASUREMENT; MAGNETIC SHIELDING; NONDESTRUCTIVE TEST; SUPERCONDUCTOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
3
Recensione:
Indirizzi per estratti:
Citazione:
S. Yamazaki et al., "A METHOD TO EVALUATE CRACKS IN A SUPERCONDUCTIVE CYLINDER USED TO SHIELD WEAK MAGNETIC-FIELDS", IEEE transactions on instrumentation and measurement, 46(4), 1997, pp. 873-876

Abstract

To survey the local superconductivity and cracks in a large superconductor, a method for estimating the property from the difference in thereal component Delta R and imaginary component Delta X of the compleximpedance of a coil with a sample and another without one is proposed, This method was applied to two samples one which was superconductiveand one not superconductive at 77.3 K, It is understood that samples become superconductive when Delta R is sufficiently near 0 and Delta Xis negative, The relation between two superconductors, one without and the other with artificially induced cracks was experimentally investigated, It was confirmed that the property of the sample,vith cracks deviated from superconductivity. As for a superconductive cylinder of 0.5 m in diameter and Im in length open at one end, Delta R and Delta Xat various points on the wall and at the closed end were measured at 77.3 K and the values of Delta R were sufficiently near 0, All values of Delta X were negative, The magnetic shielding effect was confirmed to be 1/20000.

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Documento generato il 04/04/20 alle ore 15:12:26