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Title: Surface characterization of Nb samples electropolished together with real superconducting rf accelerator cavities

Abstract

Here, we report the results of surface characterizations of niobium (Nb) samples electropolished together with a single cell superconducting radio-frequency accelerator cavity. These witness samples were located in three regions of the cavity, namely at the equator, the iris and the beam-pipe. Auger electron spectroscopy (AES) was utilized to probe the chemical composition of the topmost four atomic layers. Scanning electron microscopy with energy dispersive X-ray for elemental analysis (SEM/EDX) was used to observe the surface topography and chemical composition at the micrometer scale. A few atomic layers of sulfur (S) were found covering the samples non-uniformly. Niobium oxide granules with a sharp geometry were observed on every sample. Some Nb-O granules appeared to also contain sulfur.

Authors:
;  [1];  [2];  [3];  [4];  [3];  [3];  [3]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Graduate University for Advanced Studies, School of Advanced Sciences (GUAS/AS), Ibaraki (Japan)
  3. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  4. Graduate University for Advanced Studies, School of Advanced Sciences (GUAS/AS), Ibaraki (Japan); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1004389
Report Number(s):
JLAB-ACC-09-1124; DOE/OR/23177-1065
Journal ID: ISSN 1098-4402; TRN: US1100670
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Volume: 13; Journal Issue: 12; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; AUGER ELECTRON SPECTROSCOPY; CAVITIES; CHEMICAL COMPOSITION; EQUATOR; GEOMETRY; NIOBIUM; NIOBIUM OXIDES; PROBES; SCANNING ELECTRON MICROSCOPY; SULFUR; TOPOGRAPHY

Citation Formats

Xin Zhao, Geng, Rong -Li, Tyagi, P. V., Hayano, Hitoshi, Kato, Shigeki, Nishiwaki, Michiru, Saeki, Takayuki, and Sawabe, Motoaki. Surface characterization of Nb samples electropolished together with real superconducting rf accelerator cavities. United States: N. p., 2010. Web. doi:10.1103/PhysRevSTAB.13.124702.
Xin Zhao, Geng, Rong -Li, Tyagi, P. V., Hayano, Hitoshi, Kato, Shigeki, Nishiwaki, Michiru, Saeki, Takayuki, & Sawabe, Motoaki. Surface characterization of Nb samples electropolished together with real superconducting rf accelerator cavities. United States. doi:10.1103/PhysRevSTAB.13.124702.
Xin Zhao, Geng, Rong -Li, Tyagi, P. V., Hayano, Hitoshi, Kato, Shigeki, Nishiwaki, Michiru, Saeki, Takayuki, and Sawabe, Motoaki. Thu . "Surface characterization of Nb samples electropolished together with real superconducting rf accelerator cavities". United States. doi:10.1103/PhysRevSTAB.13.124702. https://www.osti.gov/servlets/purl/1004389.
@article{osti_1004389,
title = {Surface characterization of Nb samples electropolished together with real superconducting rf accelerator cavities},
author = {Xin Zhao and Geng, Rong -Li and Tyagi, P. V. and Hayano, Hitoshi and Kato, Shigeki and Nishiwaki, Michiru and Saeki, Takayuki and Sawabe, Motoaki},
abstractNote = {Here, we report the results of surface characterizations of niobium (Nb) samples electropolished together with a single cell superconducting radio-frequency accelerator cavity. These witness samples were located in three regions of the cavity, namely at the equator, the iris and the beam-pipe. Auger electron spectroscopy (AES) was utilized to probe the chemical composition of the topmost four atomic layers. Scanning electron microscopy with energy dispersive X-ray for elemental analysis (SEM/EDX) was used to observe the surface topography and chemical composition at the micrometer scale. A few atomic layers of sulfur (S) were found covering the samples non-uniformly. Niobium oxide granules with a sharp geometry were observed on every sample. Some Nb-O granules appeared to also contain sulfur.},
doi = {10.1103/PhysRevSTAB.13.124702},
journal = {Physical Review Special Topics. Accelerators and Beams},
issn = {1098-4402},
number = 12,
volume = 13,
place = {United States},
year = {2010},
month = {12}
}

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Cited by: 4 works
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