Speaker
Arti Dangwal Pandey
(DESY Hamburg)
Description
Thermal treatments of SRF Nb cavities – including the well-established 120°C bake and the recently reported N-infusion - are shown to improve the cavity performance significantly; however, the underlying physical phenomenon is not fully understood yet. We have chosen a much simpler system of Nb(100) single-crystals heated in different vacuum conditions and nitrogen partial pressures. In-situ X-ray reflectivity and photoelectron spectroscopy measurements were performed to monitor the changes in the elemental species on the surface during thermal treatments. Electron microscopy, x-ray diffraction, energy dispersive X-ray spectroscopy and time-of-flight –secondary ion mass spectroscopy were applied to observe the surface topography, crystallinity and depth profiles of the elements present in the near-surface region. Some samples were treated together with cavities, whose surface properties are also discussed with reference to the cavity-test results.
Primary author
Arti Dangwal Pandey
(DESY Hamburg)
Co-authors
Prof.
Andreas Stierle
(DESY)
Mr
Christopher Bate
(DESY)
Dr
Detlef Reschke
(DESY)
Mr
Guilherme Dalla Lana Semione
(DESY)
Dr
Hans Weise
(DESY)
Dr
Heshmat Noei
(DESY NanoLab)
Jörn Schaffran
(FLA)
Dr
Marc Wenskat
(DESY)
Dr
Thomas F. Keller
(DESY)
