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IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES

The fundamental understanding of vacuum discharge mechanisms and induced surface damage is indispensable for the CLIC feasibility study. We have been conducting dc sparc experiments inside a Scanning Electron Microscope (SEM) at Uppsala university in order to investigate localized breakdown phenomen...

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Detalles Bibliográficos
Autores principales: Muranaka, T, Blom, T, Leifer, K, Ziemann, V
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:http://cds.cern.ch/record/1407219
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author Muranaka, T
Blom, T
Leifer, K
Ziemann, V
author_facet Muranaka, T
Blom, T
Leifer, K
Ziemann, V
author_sort Muranaka, T
collection CERN
description The fundamental understanding of vacuum discharge mechanisms and induced surface damage is indispensable for the CLIC feasibility study. We have been conducting dc sparc experiments inside a Scanning Electron Microscope (SEM) at Uppsala university in order to investigate localized breakdown phenomena. By using a SEM, we achieve the resolution of the electron probe in the few-nm range, which is of great advantage as the surface roughness of the polished accelerating structures is in the same scale. The high accelerating field of 1 GV/m is realized by biasing an electrode with 1 kV set above the sample with a gap of sub μm. Furthermore, a second SEM equipped with a Focused Ion Beam (FIB) is used to modify the topography of sample surfaces thus the geometrical dependence of field emissions and vacuum discharges can be studied. The FIB can be used for the surface damage analysis as well. We have demonstrated subsurface damage observations by using FIB to sputter a rectangular recess into the sample in the breakdown region. Those powerful surface analysis techniques can be productively applied to the study of fatigue in prototype accelerating structures as well.
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spelling cern-14072192019-09-30T06:29:59Z http://cds.cern.ch/record/1407219 eng Muranaka, T Blom, T Leifer, K Ziemann, V IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES Accelerators and Storage Rings 9: Technology for normal conducting higher energy linear accelerators The fundamental understanding of vacuum discharge mechanisms and induced surface damage is indispensable for the CLIC feasibility study. We have been conducting dc sparc experiments inside a Scanning Electron Microscope (SEM) at Uppsala university in order to investigate localized breakdown phenomena. By using a SEM, we achieve the resolution of the electron probe in the few-nm range, which is of great advantage as the surface roughness of the polished accelerating structures is in the same scale. The high accelerating field of 1 GV/m is realized by biasing an electrode with 1 kV set above the sample with a gap of sub μm. Furthermore, a second SEM equipped with a Focused Ion Beam (FIB) is used to modify the topography of sample surfaces thus the geometrical dependence of field emissions and vacuum discharges can be studied. The FIB can be used for the surface damage analysis as well. We have demonstrated subsurface damage observations by using FIB to sputter a rectangular recess into the sample in the breakdown region. Those powerful surface analysis techniques can be productively applied to the study of fatigue in prototype accelerating structures as well. info:eu-repo/grantAgreement/EC/FP7/227579 info:eu-repo/semantics/openAccess Education Level info:eu-repo/semantics/article http://cds.cern.ch/record/1407219 2011
spellingShingle Accelerators and Storage Rings
9: Technology for normal conducting higher energy linear accelerators
Muranaka, T
Blom, T
Leifer, K
Ziemann, V
IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES
title IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES
title_full IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES
title_fullStr IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES
title_full_unstemmed IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES
title_short IN-SITU EXPERIMENTS OF VACUUM DISCHARGE USING SCANNING ELECTRON MICROSCOPES
title_sort in-situ experiments of vacuum discharge using scanning electron microscopes
topic Accelerators and Storage Rings
9: Technology for normal conducting higher energy linear accelerators
url http://cds.cern.ch/record/1407219
http://cds.cern.ch/record/1407219
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