A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities

Superconducting cavities made from niobium allow accelerating gradients of about 50 MV/m close to the theoretical limit. Quite often, however, the RF losses increase with the gradient faster than quadratic. This observation is equivalent with a decrease of the quality factor Q with the gradient, cal...

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Detalles Bibliográficos
Autor principal: Weingarten, W
Lenguaje:eng
Publicado: 2011
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1336494
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author Weingarten, W
author_facet Weingarten, W
author_sort Weingarten, W
collection CERN
description Superconducting cavities made from niobium allow accelerating gradients of about 50 MV/m close to the theoretical limit. Quite often, however, the RF losses increase with the gradient faster than quadratic. This observation is equivalent with a decrease of the quality factor Q with the gradient, called “Q-slope” for intermediate gradients, and “Q-drop” for larger ones. The paper provides an explanation by an elementary model based on the London two fluid theory of RF superconductivity and compares the model with experimental data for a large variety of cavity tests.
id cern-1336494
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
record_format invenio
spelling cern-13364942019-09-30T06:29:59Zhttp://cds.cern.ch/record/1336494engWeingarten, WA two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavitiesAccelerators and Storage RingsSuperconducting cavities made from niobium allow accelerating gradients of about 50 MV/m close to the theoretical limit. Quite often, however, the RF losses increase with the gradient faster than quadratic. This observation is equivalent with a decrease of the quality factor Q with the gradient, called “Q-slope” for intermediate gradients, and “Q-drop” for larger ones. The paper provides an explanation by an elementary model based on the London two fluid theory of RF superconductivity and compares the model with experimental data for a large variety of cavity tests.CERN-ATS-Note-2011-019 TECHoai:cds.cern.ch:13364942011-03-16
spellingShingle Accelerators and Storage Rings
Weingarten, W
A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities
title A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities
title_full A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities
title_fullStr A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities
title_full_unstemmed A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities
title_short A two-fluid model description of the Q-slope and Q-drop as observed in niobium superconducting accelerating cavities
title_sort two-fluid model description of the q-slope and q-drop as observed in niobium superconducting accelerating cavities
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1336494
work_keys_str_mv AT weingartenw atwofluidmodeldescriptionoftheqslopeandqdropasobservedinniobiumsuperconductingacceleratingcavities
AT weingartenw twofluidmodeldescriptionoftheqslopeandqdropasobservedinniobiumsuperconductingacceleratingcavities

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