Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4903808
Keywords
-
Categories
Funding
- US Department of Energy, Offices of High Energy and Nuclear Physics
- [DE-AC02-07CH11359]
Ask authors/readers for more resources
Ambient magnetic field, if trapped in the penetration depth, leads to the residual resistance and therefore sets the limit for the achievable quality factors in superconducting niobium resonators for particle accelerators. Here, we show that a complete expulsion of the magnetic flux can be performed and leads to: (1) record quality factors Q > 2 x 10(11) up to accelerating gradient of 22 MV/m; (2) Q similar to 3 x 10(10) at 2K and 16 MV/m in up to 190 mG magnetic fields. This is achieved by large thermal gradients at the normal/superconducting phase front during the cooldown. Our findings open up a way to ultra-high quality factors at low temperatures and show an alternative to the sophisticated magnetic shielding implemented in modern superconducting accelerators. (C) 2014 Author(s).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available