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Tuning procedure for the Linac4 PI Mode Structure(PIMS)

PI-Mode-Structure (PIMS) cavities will be used in the high energy section of LINAC4 (102-160 MeV). Each cavity is made of 7 coupled cells, operated in the π-mode at a resonant frequency of 352.2 MHz. The cell length remains constant for each of the 12 cavities but changes from cavity to cavity to sy...

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Detalles Bibliográficos
Autores principales: Ugena Tirado, P, Wegner, R
Lenguaje:eng
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1459586
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author Ugena Tirado, P
Wegner, R
author_facet Ugena Tirado, P
Wegner, R
author_sort Ugena Tirado, P
collection CERN
description PI-Mode-Structure (PIMS) cavities will be used in the high energy section of LINAC4 (102-160 MeV). Each cavity is made of 7 coupled cells, operated in the π-mode at a resonant frequency of 352.2 MHz. The cell length remains constant for each of the 12 cavities but changes from cavity to cavity to synchronise with the increased beam energy. This paper reports on the tuning process required to get a constant voltage in each cell at the resonant frequency which consists of re-machining to the required level the tuning rings located on each cell-wall. An algorithm based on single cell detuning, equivalent circuit simulations and precise 3D simulations for the 3 different cell types of each cavity has been developed and successfully applied to the tuning of the first PIMS cavity. In order to reduce the simulation effort for the remaining 11 cavities, an interpolation algorithm based on 3 cavities has been developed and validated. In a second tuning step, after the electron beam welding of all elements, the final adjustment of single-cell frequencies and field flatness is achieved by cutting the length of one plunger tuner per cell.
id cern-1459586
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
record_format invenio
spelling cern-14595862022-08-17T13:25:40Zhttp://cds.cern.ch/record/1459586engUgena Tirado, PWegner, RTuning procedure for the Linac4 PI Mode Structure(PIMS)Accelerators and Storage RingsPI-Mode-Structure (PIMS) cavities will be used in the high energy section of LINAC4 (102-160 MeV). Each cavity is made of 7 coupled cells, operated in the π-mode at a resonant frequency of 352.2 MHz. The cell length remains constant for each of the 12 cavities but changes from cavity to cavity to synchronise with the increased beam energy. This paper reports on the tuning process required to get a constant voltage in each cell at the resonant frequency which consists of re-machining to the required level the tuning rings located on each cell-wall. An algorithm based on single cell detuning, equivalent circuit simulations and precise 3D simulations for the 3 different cell types of each cavity has been developed and successfully applied to the tuning of the first PIMS cavity. In order to reduce the simulation effort for the remaining 11 cavities, an interpolation algorithm based on 3 cavities has been developed and validated. In a second tuning step, after the electron beam welding of all elements, the final adjustment of single-cell frequencies and field flatness is achieved by cutting the length of one plunger tuner per cell.CERN-ATS-2012-121oai:cds.cern.ch:14595862012-05-20
spellingShingle Accelerators and Storage Rings
Ugena Tirado, P
Wegner, R
Tuning procedure for the Linac4 PI Mode Structure(PIMS)
title Tuning procedure for the Linac4 PI Mode Structure(PIMS)
title_full Tuning procedure for the Linac4 PI Mode Structure(PIMS)
title_fullStr Tuning procedure for the Linac4 PI Mode Structure(PIMS)
title_full_unstemmed Tuning procedure for the Linac4 PI Mode Structure(PIMS)
title_short Tuning procedure for the Linac4 PI Mode Structure(PIMS)
title_sort tuning procedure for the linac4 pi mode structure(pims)
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1459586
work_keys_str_mv AT ugenatiradop tuningprocedureforthelinac4pimodestructurepims
AT wegnerr tuningprocedureforthelinac4pimodestructurepims