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Title: Modification on surface oxide layer structure and surface morphology of niobium by gas cluster ion beam treatments

Abstract

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.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
991132
Report Number(s):
JLAB-ACC-10-1238; DOE/OR/23177-1355
Journal ID: ISSN 1098-4402; TRN: US1007421
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article
Journal Name:
Phys.Rev.ST Accel.Beams
Additional Journal Information:
Journal Volume: 13; Journal Issue: 9; Journal ID: ISSN 1098-4402
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NIOBIUM; NIOBIUM OXIDES; FIELD EMISSION; SURFACE TREATMENTS; ION BEAMS; MOLECULAR DYNAMICS METHOD; SUPERCONDUCTING CAVITY RESONATORS; PERFORMANCE; MASS SPECTROSCOPY; MORPHOLOGY

Citation Formats

A. T. Wu, D. R. Swenson, Z. Insepov. Modification on surface oxide layer structure and surface morphology of niobium by gas cluster ion beam treatments. United States: N. p., 2010. Web. doi:10.1103/PhysRevSTAB.13.093504.
A. T. Wu, D. R. Swenson, Z. Insepov. Modification on surface oxide layer structure and surface morphology of niobium by gas cluster ion beam treatments. United States. https://doi.org/10.1103/PhysRevSTAB.13.093504
A. T. Wu, D. R. Swenson, Z. Insepov. 2010. "Modification on surface oxide layer structure and surface morphology of niobium by gas cluster ion beam treatments". United States. https://doi.org/10.1103/PhysRevSTAB.13.093504.
@article{osti_991132,
title = {Modification on surface oxide layer structure and surface morphology of niobium by gas cluster ion beam treatments},
author = {A. T. Wu, D. R. Swenson, Z. Insepov},
abstractNote = {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.},
doi = {10.1103/PhysRevSTAB.13.093504},
url = {https://www.osti.gov/biblio/991132}, journal = {Phys.Rev.ST Accel.Beams},
issn = {1098-4402},
number = 9,
volume = 13,
place = {United States},
year = {Wed Sep 01 00:00:00 EDT 2010},
month = {Wed Sep 01 00:00:00 EDT 2010}
}