Pathway to a Post Processing Increase in Q0 of SRF Cavities

A significant improvement of the quality factor Q0 from values of 1.5x1010 to values around 3x1010 at 1.8 K has been repeatedly achieved in a fully dressed and horizontally operated TESLA type SRF cavity by thermal cycling, i.e. heating the cavity briefly above the 9.2 K transition temperature of ni...

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Detalles Bibliográficos
Autores principales: Kugeler, O, Vogt, J, Knobloch, J, Aull, S
Lenguaje:eng
Publicado: 2013
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1595481
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author Kugeler, O
Vogt, J
Knobloch, J
Aull, S
author_facet Kugeler, O
Vogt, J
Knobloch, J
Aull, S
author_sort Kugeler, O
collection CERN
description A significant improvement of the quality factor Q0 from values of 1.5x1010 to values around 3x1010 at 1.8 K has been repeatedly achieved in a fully dressed and horizontally operated TESLA type SRF cavity by thermal cycling, i.e. heating the cavity briefly above the 9.2 K transition temperature of niobium and subsequent cooling. Conceivable explanations for this effect reach from (a) changes in shielding efficacy of the magnetic shielding to (b) thermal currents to (c) hydrogen diffusion. Our experiments suggest that neither (a) nor (c) are responsible for the changes in quality factor. It appears that the dynamics on frozen flux at the transition temperature is responsible for the observed effect. The pathway to this finding is being presented and the application to SRF systems is elicited.
id cern-1595481
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2013
record_format invenio
spelling cern-15954812019-09-30T06:29:59Zhttp://cds.cern.ch/record/1595481engKugeler, OVogt, JKnobloch, JAull, SPathway to a Post Processing Increase in Q0 of SRF CavitiesAccelerators and Storage RingsA significant improvement of the quality factor Q0 from values of 1.5x1010 to values around 3x1010 at 1.8 K has been repeatedly achieved in a fully dressed and horizontally operated TESLA type SRF cavity by thermal cycling, i.e. heating the cavity briefly above the 9.2 K transition temperature of niobium and subsequent cooling. Conceivable explanations for this effect reach from (a) changes in shielding efficacy of the magnetic shielding to (b) thermal currents to (c) hydrogen diffusion. Our experiments suggest that neither (a) nor (c) are responsible for the changes in quality factor. It appears that the dynamics on frozen flux at the transition temperature is responsible for the observed effect. The pathway to this finding is being presented and the application to SRF systems is elicited.CERN-ACC-2013-0192oai:cds.cern.ch:15954812013-05-12
spellingShingle Accelerators and Storage Rings
Kugeler, O
Vogt, J
Knobloch, J
Aull, S
Pathway to a Post Processing Increase in Q0 of SRF Cavities
title Pathway to a Post Processing Increase in Q0 of SRF Cavities
title_full Pathway to a Post Processing Increase in Q0 of SRF Cavities
title_fullStr Pathway to a Post Processing Increase in Q0 of SRF Cavities
title_full_unstemmed Pathway to a Post Processing Increase in Q0 of SRF Cavities
title_short Pathway to a Post Processing Increase in Q0 of SRF Cavities
title_sort pathway to a post processing increase in q0 of srf cavities
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1595481
work_keys_str_mv AT kugelero pathwaytoapostprocessingincreaseinq0ofsrfcavities
AT vogtj pathwaytoapostprocessingincreaseinq0ofsrfcavities
AT knoblochj pathwaytoapostprocessingincreaseinq0ofsrfcavities
AT aulls pathwaytoapostprocessingincreaseinq0ofsrfcavities

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