Evidence for preferential flux flow at the grain boundaries of superconducting RF-quality niobium
نویسندگان
چکیده
منابع مشابه
Large-grain Superconducting Rf Cavities at Desy
The DESY R&D program on cavities fabricated from large-grain niobium explores the potential of this material for the production of approximately 1000 nine-cell cavities for the European XFEL. The program investigates both basic material properties, comparing large grain material to standard sheet niobium, and material availability, production, and preparation aspects. Several single-cell caviti...
متن کاملSurface Superconductivity in Niobium for Superconducting RF Cavities
A systematic study is presented on the superconductivity (sc) parameters of the ultrapure niobium used for the fabrication of the nine-cell 1.3 GHz cavities for the linear collider project TESLA. Cylindrical Nb samples have been subjected to the same surface treatments that are applied to the TESLA cavities: buffered chemical polishing (BCP), electrolytic polishing (EP), low-temperature bakeout...
متن کاملJosephson vortices with fractional flux quanta at YBa2Cu3O7Àx grain boundaries
We report numerical simulations of magnetic flux patterns in asymmetric 45° @001#-tilt grain boundaries in YBa2Cu3O72x superconducting films. The grain boundaries are treated as Josephson junctions with a critical current density j c(x) alternating rapidly along the junctions with a typical length scale which is much less than Josephson penetration depth. We demonstrate the existence of Josephs...
متن کاملProgress toward an All Niobium Superconducting Rf Photocathode Electron Gun*
Advanced Energy Systems Inc (AES) and Brookhaven National Laboratory (BNL) are currently working on a program to develop a Superconducting Photocathode Electron Gun using an all Nb cavity. The work is being performed as a Phase II SBIR and under a CRADA between AES and BNL. Results of initial efforts have been presented previously [1,2]. This paper will review the progress being made in this pr...
متن کاملLayering transitions at grain boundaries
We review various simplified models that have been advanced to describe layering (complexion) transitions at grain boundaries in multicomponent solids. In particular, we first outline lattice-gas, off-lattice atomistic and thermodynamic models that have been employed to investigate phase-like behavior at segregated grain boundaries. The results of these investigations are summarized in the form...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Superconductor Science and Technology
سال: 2018
ISSN: 0953-2048,1361-6668
DOI: 10.1088/1361-6668/aaa65d