Modification on surface oxide layer structure and surface morphology of niobium by gas cluster ion beam treatments
Recently, it was demonstrated that significant reductions in field emission on Nb surfaces could be achieved by means of a new surface treatment technique called gas cluster ion beam (GCIB). Further study as shown in this paper revealed that GCIB treatments could modify surface irregularities and remove surface asperities leading to a smoother surface finish as demonstrated through measurements using a 3D profilometer, an atomic force microscope, and a scanning electron microscope. These experimental observations were supported by computer simulation via atomistic molecular dynamics and a phenomenological surface dynamics. Measurements employing a secondary ion mass spectrometry found that GCIB could also alter Nb surface oxide layer structure. Possible implications of the experimental results on the performance of Nb superconducting radio frequency cavities treated by GCIB will be discussed. First experimental results on Nb single cell superconducting radio frequency cavities treated by GCIB will be reported.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 991132
- Report Number(s):
- JLAB-ACC-10-1238; DOE/OR/23177-1355; TRN: US1007421
- Journal Information:
- Phys.Rev.ST Accel.Beams, Vol. 13, Issue 9; ISSN 1098-4402
- Country of Publication:
- United States
- Language:
- English
Similar Records
Highly smooth Nb surfaces fabricated by buffered electropolishing
Effect of Different Cutting Techniques on the Surface Morphology and Composition of Niobium