| Paper | Title | Page |
|---|
| WEP37 | Nondistructive testing instrument of dished Nb sheets for SRF cavities based on squid technology | 562 |
| | - Q. S. Shu, J. Susta, G. F. Cheng, I. Phipps
AMAC Inc - R. Selim, J. Mast
Christopher Newport University - P. Kneisel, G. Myneni
JLab - I. Ben-Zvi
Brookhaven National Lab
| |
| | The performance of superconducting RF cavities used in
accelerators can be enhanced by detecting micro particles
and inclusions which are the most serious source of
performance degradation. These defects prevent the
cavities from reaching the highest possible accelerating
fields. We have developed a SQUID scanning system
based on eddy current technique that allows the scanning
of curved Nb samples. This SQUID scanning system
successfully located Tantalum defects about 100 um
diameter in a flat Nb sample and was able to also locate
the defects in a cylindrical surface sample. Most
importantly, however, the system successfully located the
defects on the backside of the flat sample and curved
sample, both 3-mm thick. This system can be used for the
inspection and detection of such defects during SRF
cavity manufacturing. | |