Transport currents measured in ring samples : test of superconducting weld.
The critical current densities in bulk melt-textured YBa{sub 2}Cu{sub 3}O{sub x} and across superconducting 'weld' joints are measured using scanning Hall probe measurements of the trapped magnetic field in ring samples. With this method, critical current densities are obtained without the use of electrical contacts. Large persistent currents are induced in ring samples at 77 K, after cooling in a 3 kG field. These currents can be determined from the magnetic field they produce. At 77 K a supercurrent exceeding 2000 A (about 10{sup 4} A/cm{sup 2}) was induced in a 2 cm diameter ring; this current produces a magnetic field exceeding 1.5 kG in the bore of the ring. We demonstrate that when a ring is cut, and the cut is repaired by a superconducting weld, the weld joint can transmit the same high supercurrent as the bulk.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942969
- Report Number(s):
- ANL/MSD/JA-36329; PHYCE6; TRN: US201002%%471
- Journal Information:
- Physica C, Vol. 350, Issue 1-2 ; Feb. 1, 2001; ISSN 0921-4534
- Country of Publication:
- United States
- Language:
- ENGLISH
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