Cargando…
Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen
The following work summarises simulation results obtained at CERN for the beam-induced electron cloud and looks at possible cures for the heat load in the LHC beam screen. The synchrotron radiation in the LHC creates a continuous flow of photoelectrons. These electrons are accelerated by the electri...
Autor principal: | |
---|---|
Lenguaje: | eng |
Publicado: |
1998
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/359253 |
_version_ | 1780892613384077312 |
---|---|
author | Brüning, Oliver Sim |
author_facet | Brüning, Oliver Sim |
author_sort | Brüning, Oliver Sim |
collection | CERN |
description | The following work summarises simulation results obtained at CERN for the beam-induced electron cloud and looks at possible cures for the heat load in the LHC beam screen. The synchrotron radiation in the LHC creates a continuous flow of photoelectrons. These electrons are accelerated by the electric field of the bunch and hit the vacuum chamber on the opposite side of the beam pipe where they crea te secondary electrons which are again accelerated by the next bunch. For a large secondary emission yield the above mechanism leads to an exponential growth of the electron cloud which is limited by space charge forces. The simulations use a two-dimensional mesh for the space charge calculations and include the effect of image charges on the vacuum chamber wall. Depending on the quantum yield for the production of photoelectrons, the secondary emission yield and the reflectivity, the heat load can vary from 0.1 W/m to more than 15 W/m. |
id | cern-359253 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1998 |
record_format | invenio |
spelling | cern-3592532023-05-31T13:22:18Zhttp://cds.cern.ch/record/359253engBrüning, Oliver SimNumerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam ScreenAccelerators and Storage RingsThe following work summarises simulation results obtained at CERN for the beam-induced electron cloud and looks at possible cures for the heat load in the LHC beam screen. The synchrotron radiation in the LHC creates a continuous flow of photoelectrons. These electrons are accelerated by the electric field of the bunch and hit the vacuum chamber on the opposite side of the beam pipe where they crea te secondary electrons which are again accelerated by the next bunch. For a large secondary emission yield the above mechanism leads to an exponential growth of the electron cloud which is limited by space charge forces. The simulations use a two-dimensional mesh for the space charge calculations and include the effect of image charges on the vacuum chamber wall. Depending on the quantum yield for the production of photoelectrons, the secondary emission yield and the reflectivity, the heat load can vary from 0.1 W/m to more than 15 W/m.LHC-Project-Report-190CERN-LHC-Project-Report-190oai:cds.cern.ch:3592531998-06-03 |
spellingShingle | Accelerators and Storage Rings Brüning, Oliver Sim Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen |
title | Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen |
title_full | Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen |
title_fullStr | Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen |
title_full_unstemmed | Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen |
title_short | Numerical Simulations for the Beam-Induced Electron Cloud in the LHC Beam Screen |
title_sort | numerical simulations for the beam-induced electron cloud in the lhc beam screen |
topic | Accelerators and Storage Rings |
url | http://cds.cern.ch/record/359253 |
work_keys_str_mv | AT bruningoliversim numericalsimulationsforthebeaminducedelectroncloudinthelhcbeamscreen |