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Removing Known SPS Intensity Limitations for High Luminosity LHC Goals

In preparation of the SPS as an LHC injector its impedance was significantly reduced in 1999 - 2000. A new SPS impedance reduction campaign is planned now for the High Luminosity (HL)-LHC project, which requires bunch intensities twice as high as the nominal one. One of the known intensity limitatio...

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Autores principales: Shaposhnikova, Elena, Argyropoulos, Theodoros, Bohl, Thomas, Cruikshank, Paul, Goddard, Brennan, Kaltenbacher, Thomas, Lasheen, Alexandre, Perez Espinos, Jaime, Repond, Joël, Salvant, Benoit, Vollinger, Christine
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2016-MOPOY058
http://cds.cern.ch/record/2207336
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author Shaposhnikova, Elena
Argyropoulos, Theodoros
Bohl, Thomas
Cruikshank, Paul
Goddard, Brennan
Kaltenbacher, Thomas
Lasheen, Alexandre
Perez Espinos, Jaime
Repond, Joël
Salvant, Benoit
Vollinger, Christine
author_facet Shaposhnikova, Elena
Argyropoulos, Theodoros
Bohl, Thomas
Cruikshank, Paul
Goddard, Brennan
Kaltenbacher, Thomas
Lasheen, Alexandre
Perez Espinos, Jaime
Repond, Joël
Salvant, Benoit
Vollinger, Christine
author_sort Shaposhnikova, Elena
collection CERN
description In preparation of the SPS as an LHC injector its impedance was significantly reduced in 1999 - 2000. A new SPS impedance reduction campaign is planned now for the High Luminosity (HL)-LHC project, which requires bunch intensities twice as high as the nominal one. One of the known intensity limitations is a longitudinal multi-bunch instability with a threshold 3 times below this operational intensity. The instability is presently cured using the 4th harmonic RF system and controlled emittance blow-up, but reaching the HL-LHC parameters cannot be assured without improving the machine impedance. Recently the impedance sources responsible for this instability were identified and implementation of their shielding and damping is foreseen during the next long shutdown (2019 - 2020) in synergy with two other important upgrades: amorphous carbon coating of (part of) the vacuum chamber against the e-cloud effect and rearrangement of the 200 MHz RF system. In this paper the strategy of impedance reduction is presented together with beam intensity achievable after its realisation. The potential effect of other proposals on remaining limitations is also considered.
id oai-inspirehep.net-1469789
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling oai-inspirehep.net-14697892022-08-10T12:44:40Zdoi:10.18429/JACoW-IPAC2016-MOPOY058http://cds.cern.ch/record/2207336engShaposhnikova, ElenaArgyropoulos, TheodorosBohl, ThomasCruikshank, PaulGoddard, BrennanKaltenbacher, ThomasLasheen, AlexandrePerez Espinos, JaimeRepond, JoëlSalvant, BenoitVollinger, ChristineRemoving Known SPS Intensity Limitations for High Luminosity LHC GoalsAccelerators and Storage RingsIn preparation of the SPS as an LHC injector its impedance was significantly reduced in 1999 - 2000. A new SPS impedance reduction campaign is planned now for the High Luminosity (HL)-LHC project, which requires bunch intensities twice as high as the nominal one. One of the known intensity limitations is a longitudinal multi-bunch instability with a threshold 3 times below this operational intensity. The instability is presently cured using the 4th harmonic RF system and controlled emittance blow-up, but reaching the HL-LHC parameters cannot be assured without improving the machine impedance. Recently the impedance sources responsible for this instability were identified and implementation of their shielding and damping is foreseen during the next long shutdown (2019 - 2020) in synergy with two other important upgrades: amorphous carbon coating of (part of) the vacuum chamber against the e-cloud effect and rearrangement of the 200 MHz RF system. In this paper the strategy of impedance reduction is presented together with beam intensity achievable after its realisation. The potential effect of other proposals on remaining limitations is also considered.CERN-ACC-2016-289oai:inspirehep.net:14697892016
spellingShingle Accelerators and Storage Rings
Shaposhnikova, Elena
Argyropoulos, Theodoros
Bohl, Thomas
Cruikshank, Paul
Goddard, Brennan
Kaltenbacher, Thomas
Lasheen, Alexandre
Perez Espinos, Jaime
Repond, Joël
Salvant, Benoit
Vollinger, Christine
Removing Known SPS Intensity Limitations for High Luminosity LHC Goals
title Removing Known SPS Intensity Limitations for High Luminosity LHC Goals
title_full Removing Known SPS Intensity Limitations for High Luminosity LHC Goals
title_fullStr Removing Known SPS Intensity Limitations for High Luminosity LHC Goals
title_full_unstemmed Removing Known SPS Intensity Limitations for High Luminosity LHC Goals
title_short Removing Known SPS Intensity Limitations for High Luminosity LHC Goals
title_sort removing known sps intensity limitations for high luminosity lhc goals
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-IPAC2016-MOPOY058
http://cds.cern.ch/record/2207336
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