Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures

The LHC collimators have very complicated mechanical designs including movable jaws made of higly resistive materials, ferrite materials, tiny RF contacts. Since the jaws are moved very close to the circulating beams their contribution in the overall LHC coupling impedance is dominant, with respect...

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Detalles Bibliográficos
Autores principales: Frasciello, Oscar, Zobov, Mikhail
Lenguaje:eng
Publicado: 2015
Materias:
physics.acc-ph
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.18429/JACoW-ICAP2015-FRAJI1
http://cds.cern.ch/record/2065038
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author Frasciello, Oscar
Zobov, Mikhail
author_facet Frasciello, Oscar
Zobov, Mikhail
author_sort Frasciello, Oscar
collection CERN
description The LHC collimators have very complicated mechanical designs including movable jaws made of higly resistive materials, ferrite materials, tiny RF contacts. Since the jaws are moved very close to the circulating beams their contribution in the overall LHC coupling impedance is dominant, with respect to other machine components. For these reasons accurate simulation of collimators' impedance becomes very important and challenging. Besides, several dedicated tests have been performed to verify correct simulations of lossy dispersive material properties, such as resistive wall and ferrites, benchmarking code results with analytical, semi-analytical and other numerical codes outcomes. Here we describe all the performed numerical tests and discuss the results of LHC collimators' impedances and wake fields calculations.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2015
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spelling cern-20650382021-05-03T20:03:14Zdoi:10.18429/JACoW-ICAP2015-FRAJI1http://cds.cern.ch/record/2065038engFrasciello, OscarZobov, MikhailNumerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structuresphysics.acc-phAccelerators and Storage RingsThe LHC collimators have very complicated mechanical designs including movable jaws made of higly resistive materials, ferrite materials, tiny RF contacts. Since the jaws are moved very close to the circulating beams their contribution in the overall LHC coupling impedance is dominant, with respect to other machine components. For these reasons accurate simulation of collimators' impedance becomes very important and challenging. Besides, several dedicated tests have been performed to verify correct simulations of lossy dispersive material properties, such as resistive wall and ferrites, benchmarking code results with analytical, semi-analytical and other numerical codes outcomes. Here we describe all the performed numerical tests and discuss the results of LHC collimators' impedances and wake fields calculations.The LHC collimators have very complicated mechanical designs including movable jaws made of higly resistive materials, ferrite materials, tiny RF contacts. Since the jaws are moved very close to the circulating beams their contribution in the overall LHC coupling impedance is dominant, with respect to other machine components. For these reasons accurate simulation of collimators' impedance becomes very important and challenging. In order to simulate collimators as close as possible to their real designs, we used CAD drawings including all the mechanical details as GdfidL code inputs. A very fine mesh, typically of several billions of mesh points, was required to reproduce the long and complicated structures and to overcome arising numerical problems, which turns out to be a huge computing task. Besides, several dedicated tests have been performed to verify correct simulations of lossy dispersive material properties, such as resistive wall and ferrites, benchmarking code results with analytical, semi-analytical and other numerical codes outcomes. Here we describe all the performed numerical tests and discuss the results of LHC collimators' impedances and wake fields calculations.arXiv:1511.01236oai:cds.cern.ch:20650382015-11-04
spellingShingle physics.acc-ph
Accelerators and Storage Rings
Frasciello, Oscar
Zobov, Mikhail
Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures
title Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures
title_full Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures
title_fullStr Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures
title_full_unstemmed Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures
title_short Numerical Calculations of Wake Fields and Impedances of LHC Collimators' Real Structures
title_sort numerical calculations of wake fields and impedances of lhc collimators' real structures
topic physics.acc-ph
Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-ICAP2015-FRAJI1
http://cds.cern.ch/record/2065038
work_keys_str_mv AT frasciellooscar numericalcalculationsofwakefieldsandimpedancesoflhccollimatorsrealstructures
AT zobovmikhail numericalcalculationsofwakefieldsandimpedancesoflhccollimatorsrealstructures

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