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PcInterlock: Implementation and Operational Experience with the Optics Interlock

In 2016 the luminosity reach of the LHC was increased by reducing the β-function in the main collision points below the design value to β∗ = 40 cm. This was possible due to a review of the margins in the collimation hierarchy followed by the implementation of additional measures to ensure the phase...

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Autores principales: Schaumann, Michaela, Calia, Andrea, Fuchsberger, Kajetan, Wenninger, Jorg
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2320154
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author Schaumann, Michaela
Calia, Andrea
Fuchsberger, Kajetan
Wenninger, Jorg
author_facet Schaumann, Michaela
Calia, Andrea
Fuchsberger, Kajetan
Wenninger, Jorg
author_sort Schaumann, Michaela
collection CERN
description In 2016 the luminosity reach of the LHC was increased by reducing the β-function in the main collision points below the design value to β∗ = 40 cm. This was possible due to a review of the margins in the collimation hierarchy followed by the implementation of additional measures to ensure the phase advance in defined ranges around the circumference. The risk of damaging the triplet or the tertiary collimators (TCTs) close to the interaction points in the event of an asynchronous beam dump is minimized by including margins in the collimation hierarchy, which define the β∗-reach. By guaranteeing the phase advance within an acceptable tolerance between the beam dump kicker and the TCTs, those margins can be reduced and operation at lower β∗ becomes possible. A new interlock system on the quadrupole magnet currents was put in place to safeguard the stability of the phase advance. This note describes the technical implementation of this power-converter interlock (PcInterlock) and the strategies used to derive appropriated tolerances to allow sufficient protection without risking false beam dump triggers. The experience with the new PcInterlock settings in 2016-18 are discussed.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-23201542019-10-15T18:30:42Zhttp://cds.cern.ch/record/2320154engSchaumann, MichaelaCalia, AndreaFuchsberger, KajetanWenninger, JorgPcInterlock: Implementation and Operational Experience with the Optics InterlockAccelerators and Storage RingsIn 2016 the luminosity reach of the LHC was increased by reducing the β-function in the main collision points below the design value to β∗ = 40 cm. This was possible due to a review of the margins in the collimation hierarchy followed by the implementation of additional measures to ensure the phase advance in defined ranges around the circumference. The risk of damaging the triplet or the tertiary collimators (TCTs) close to the interaction points in the event of an asynchronous beam dump is minimized by including margins in the collimation hierarchy, which define the β∗-reach. By guaranteeing the phase advance within an acceptable tolerance between the beam dump kicker and the TCTs, those margins can be reduced and operation at lower β∗ becomes possible. A new interlock system on the quadrupole magnet currents was put in place to safeguard the stability of the phase advance. This note describes the technical implementation of this power-converter interlock (PcInterlock) and the strategies used to derive appropriated tolerances to allow sufficient protection without risking false beam dump triggers. The experience with the new PcInterlock settings in 2016-18 are discussed.CERN-BE-2018-001oai:cds.cern.ch:23201542018-05-24
spellingShingle Accelerators and Storage Rings
Schaumann, Michaela
Calia, Andrea
Fuchsberger, Kajetan
Wenninger, Jorg
PcInterlock: Implementation and Operational Experience with the Optics Interlock
title PcInterlock: Implementation and Operational Experience with the Optics Interlock
title_full PcInterlock: Implementation and Operational Experience with the Optics Interlock
title_fullStr PcInterlock: Implementation and Operational Experience with the Optics Interlock
title_full_unstemmed PcInterlock: Implementation and Operational Experience with the Optics Interlock
title_short PcInterlock: Implementation and Operational Experience with the Optics Interlock
title_sort pcinterlock: implementation and operational experience with the optics interlock
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2320154
work_keys_str_mv AT schaumannmichaela pcinterlockimplementationandoperationalexperiencewiththeopticsinterlock
AT caliaandrea pcinterlockimplementationandoperationalexperiencewiththeopticsinterlock
AT fuchsbergerkajetan pcinterlockimplementationandoperationalexperiencewiththeopticsinterlock
AT wenningerjorg pcinterlockimplementationandoperationalexperiencewiththeopticsinterlock