Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities
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 elec...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2010-12-01
|
| Series: | Physical Review Special Topics. Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevSTAB.13.124702 |
| _version_ | 1818148821049278464 |
|---|---|
| author | Xin Zhao Rong-Li Geng P. V. Tyagi Hitoshi Hayano Shigeki Kato Michiru Nishiwaki Takayuki Saeki Motoaki Sawabe |
| author_facet | Xin Zhao Rong-Li Geng P. V. Tyagi Hitoshi Hayano Shigeki Kato Michiru Nishiwaki Takayuki Saeki Motoaki Sawabe |
| author_sort | Xin Zhao |
| collection | DOAJ |
| description | 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 was utilized to probe the chemical composition of the topmost four atomic layers. Scanning electron microscopy with energy dispersive x ray for elemental analysis 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 nonuniformly. Niobium oxide granules with a sharp geometry were observed on every sample. Some Nb-O granules appeared to also contain sulfur. |
| first_indexed | 2024-12-11T12:57:14Z |
| format | Article |
| id | doaj.art-8a77b418b5424b109335d2ad1c6c5652 |
| institution | Directory Open Access Journal |
| issn | 1098-4402 |
| language | English |
| last_indexed | 2024-12-11T12:57:14Z |
| publishDate | 2010-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Special Topics. Accelerators and Beams |
| spelling | doaj.art-8a77b418b5424b109335d2ad1c6c56522022-12-22T01:06:33ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022010-12-01131212470210.1103/PhysRevSTAB.13.124702Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavitiesXin ZhaoRong-Li GengP. V. TyagiHitoshi HayanoShigeki KatoMichiru NishiwakiTakayuki SaekiMotoaki SawabeWe 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 was utilized to probe the chemical composition of the topmost four atomic layers. Scanning electron microscopy with energy dispersive x ray for elemental analysis 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 nonuniformly. Niobium oxide granules with a sharp geometry were observed on every sample. Some Nb-O granules appeared to also contain sulfur.http://doi.org/10.1103/PhysRevSTAB.13.124702 |
| spellingShingle | Xin Zhao Rong-Li Geng P. V. Tyagi Hitoshi Hayano Shigeki Kato Michiru Nishiwaki Takayuki Saeki Motoaki Sawabe Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities Physical Review Special Topics. Accelerators and Beams |
| title | Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities |
| title_full | Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities |
| title_fullStr | Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities |
| title_full_unstemmed | Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities |
| title_short | Surface characterization of Nb samples electropolished with real superconducting rf accelerator cavities |
| title_sort | surface characterization of nb samples electropolished with real superconducting rf accelerator cavities |
| url | http://doi.org/10.1103/PhysRevSTAB.13.124702 |
| work_keys_str_mv | AT xinzhao surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT rongligeng surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT pvtyagi surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT hitoshihayano surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT shigekikato surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT michirunishiwaki surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT takayukisaeki surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities AT motoakisawabe surfacecharacterizationofnbsampleselectropolishedwithrealsuperconductingrfacceleratorcavities |