Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor

The obtained Q0 value of a superconducting niobium cavity is known to depend on various factors like the RRR of the Niobium material, crystallinity, chemical treatment history, the high-pressure rinsing process, or effectiveness of the magnetic shielding. We have observed that spatial thermal g...

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Detalles Bibliográficos
Autores principales: Kugeler, O, Vogt, J, Knobloch, J, Aull, S
Lenguaje:eng
Publicado: 2012
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1558306
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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 The obtained Q0 value of a superconducting niobium cavity is known to depend on various factors like the RRR of the Niobium material, crystallinity, chemical treatment history, the high-pressure rinsing process, or effectiveness of the magnetic shielding. We have observed that spatial thermal gradients over the cavity length during cool-down appear to contribute to a degradation of Q0. Measurements were performed in the Horizontal Bi-Cavity Test Facility (HoBiCaT) at HZB on TESLA type cavities as well as on disc- and rod-shaped niobium samples equipped with thermal, electrical and magnetic diagnostics. Possible explanations for the effect are discussed.
id cern-1558306
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
record_format invenio
spelling cern-15583062019-09-30T06:29:59Zhttp://cds.cern.ch/record/1558306engKugeler, OVogt, JKnobloch, JAull, SImpact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality FactorAccelerators and Storage RingsThe obtained Q0 value of a superconducting niobium cavity is known to depend on various factors like the RRR of the Niobium material, crystallinity, chemical treatment history, the high-pressure rinsing process, or effectiveness of the magnetic shielding. We have observed that spatial thermal gradients over the cavity length during cool-down appear to contribute to a degradation of Q0. Measurements were performed in the Horizontal Bi-Cavity Test Facility (HoBiCaT) at HZB on TESLA type cavities as well as on disc- and rod-shaped niobium samples equipped with thermal, electrical and magnetic diagnostics. Possible explanations for the effect are discussed.oai:cds.cern.ch:15583062012
spellingShingle Accelerators and Storage Rings
Kugeler, O
Vogt, J
Knobloch, J
Aull, S
Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor
title Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor
title_full Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor
title_fullStr Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor
title_full_unstemmed Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor
title_short Impact of Trapped Flux and Thermal Gradients on the SRF Cavity Quality Factor
title_sort impact of trapped flux and thermal gradients on the srf cavity quality factor
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1558306
work_keys_str_mv AT kugelero impactoftrappedfluxandthermalgradientsonthesrfcavityqualityfactor
AT vogtj impactoftrappedfluxandthermalgradientsonthesrfcavityqualityfactor
AT knoblochj impactoftrappedfluxandthermalgradientsonthesrfcavityqualityfactor
AT aulls impactoftrappedfluxandthermalgradientsonthesrfcavityqualityfactor

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