Completion of a High-Tc Hand-held SQUID System and Development of Small High-Fill-Factor Coils for Application to Non-Destructive Evaluation
Abstract
This project had two main objectives. The first objective was to complete the construction and testing of a high-fill factor, small-coil Superconducting Quantum Interference Device (SQUID) system that will allow one to feed a straight wire or flowing medium through a small coil that is tightly coupled to a SQUID. A prototype high-Tc SQUID-based, cryo-cooled system was designed, built, and operated. The goal for this "flow-through" system was to determine whether it will be useful for finding defects in Cu-clad NbTi wire or for other applications involving flowing media. Test copper wire samples up to 2 meters in length were pulled through apparatus at speeds up to a millisecond and double frequency subtraction technique was exploited to remove motional artifacts. The second objective was to complete the construction of a hand-held, high-Tc SQUID system that was developed by SQM, Inc., determine the feasibility of this approach to building a hand-held SQUID system, and test its applicability to nondestructive evaluation of metal parts. Tests on the cryo-cooler revealed a poor connection to the cryo battery, and vibrations from the sterling cycle cryo-cooler were judged to be too large for the system to run while the refrigerator was operating. (3 tables, 26 figures, 7 refs.)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 14, 2004
- Accession Number
- ADA425517
Entities
People
- F. C. Wellstood
Organizations
- University of Maryland