Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)

For a sufficient density of a window-less gas target based on a storage cell, a substantial gas flow rate is required, exceeding that of UHV vacuum systems. Therefore, differential pumping has to be applied in order to limit the gas flow into neighbouring sections. Applying analytical formulae valid...

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Autor principal: Steffens, Erhard
Lenguaje:eng
Publicado: 2019
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2658197
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author Steffens, Erhard
author_facet Steffens, Erhard
author_sort Steffens, Erhard
collection CERN
description For a sufficient density of a window-less gas target based on a storage cell, a substantial gas flow rate is required, exceeding that of UHV vacuum systems. Therefore, differential pumping has to be applied in order to limit the gas flow into neighbouring sections. Applying analytical formulae valid in the molecular regime, the on-axis flow – which can not be collimated – from the downstream end of the target tube towards the VELO vessel is estimated. It has been shown that the existing vacuum systems can cope with the flow.
id cern-2658197
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
record_format invenio
spelling cern-26581972021-08-04T15:45:42Zhttp://cds.cern.ch/record/2658197engSteffens, ErhardNote on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)Accelerators and Storage RingsFor a sufficient density of a window-less gas target based on a storage cell, a substantial gas flow rate is required, exceeding that of UHV vacuum systems. Therefore, differential pumping has to be applied in order to limit the gas flow into neighbouring sections. Applying analytical formulae valid in the molecular regime, the on-axis flow – which can not be collimated – from the downstream end of the target tube towards the VELO vessel is estimated. It has been shown that the existing vacuum systems can cope with the flow.CERN-PBC-Notes-2019-002oai:cds.cern.ch:26581972019
spellingShingle Accelerators and Storage Rings
Steffens, Erhard
Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)
title Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)
title_full Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)
title_fullStr Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)
title_full_unstemmed Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)
title_short Note on the Efficiency of Differential Pumping in the LHC Polarized Gas Target (PGT)
title_sort note on the efficiency of differential pumping in the lhc polarized gas target (pgt)
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2658197
work_keys_str_mv AT steffenserhard noteontheefficiencyofdifferentialpumpinginthelhcpolarizedgastargetpgt

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