Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$

A cryogenic vacuum system has been used to study both the surface pumping of gases and the molecular photodesorption yield from OFE copper in the temperature range from 5 K to 300 K. The sticking coefficient on a `bare surface´ was found to increase with decreasing temperature of the substrate and...

Descripción completa

Detalles Bibliográficos
Autores principales: Baglin, V, Collins, I R, Gröbner, Oswald, Grünhagel, C, Jenninger, B
Lenguaje:eng
Publicado: 2001
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1016/S0042-207X(02)00226-9
http://cds.cern.ch/record/525101
_version_ 1780897884722429952
author Baglin, V
Collins, I R
Gröbner, Oswald
Grünhagel, C
Jenninger, B
author_facet Baglin, V
Collins, I R
Gröbner, Oswald
Grünhagel, C
Jenninger, B
author_sort Baglin, V
collection CERN
description A cryogenic vacuum system has been used to study both the surface pumping of gases and the molecular photodesorption yield from OFE copper in the temperature range from 5 K to 300 K. The sticking coefficient on a `bare surface´ was found to increase with decreasing temperature of the substrate and below 20 K, to be in the range of a few percent for all gas species studied. The molecular photodesorption yield for the `bare surface´ was found to decrease with decreasing temperature and below 20 K, after an accumulated photon dose of 3.1 1022 photons m-1, to be in the range of 10-4 molecules photon-1 for H2 and 10-5 molecules photon-1 for the other gas species. These measured values are used to predict the evolution of the gas densities in the LHC. Implications to the LHC are discussed.
id cern-525101
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
record_format invenio
spelling cern-5251012023-05-31T13:22:13Zdoi:10.1016/S0042-207X(02)00226-9http://cds.cern.ch/record/525101engBaglin, VCollins, I RGröbner, OswaldGrünhagel, CJenninger, BMolecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$Accelerators and Storage RingsA cryogenic vacuum system has been used to study both the surface pumping of gases and the molecular photodesorption yield from OFE copper in the temperature range from 5 K to 300 K. The sticking coefficient on a `bare surface´ was found to increase with decreasing temperature of the substrate and below 20 K, to be in the range of a few percent for all gas species studied. The molecular photodesorption yield for the `bare surface´ was found to decrease with decreasing temperature and below 20 K, after an accumulated photon dose of 3.1 1022 photons m-1, to be in the range of 10-4 molecules photon-1 for H2 and 10-5 molecules photon-1 for the other gas species. These measured values are used to predict the evolution of the gas densities in the LHC. Implications to the LHC are discussed.LHC-Project-Report-518CERN-LHC-Project-Report-518oai:cds.cern.ch:5251012001-11-01
spellingShingle Accelerators and Storage Rings
Baglin, V
Collins, I R
Gröbner, Oswald
Grünhagel, C
Jenninger, B
Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$
title Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$
title_full Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$
title_fullStr Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$
title_full_unstemmed Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$
title_short Molecular desorption by synchrotron radiation and sticking coefficient temperatures for H$_{2}$, CH$_{4}$, CO and CO$_{2}$
title_sort molecular desorption by synchrotron radiation and sticking coefficient temperatures for h$_{2}$, ch$_{4}$, co and co$_{2}$
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1016/S0042-207X(02)00226-9
http://cds.cern.ch/record/525101
work_keys_str_mv AT baglinv moleculardesorptionbysynchrotronradiationandstickingcoefficienttemperaturesforh2ch4coandco2
AT collinsir moleculardesorptionbysynchrotronradiationandstickingcoefficienttemperaturesforh2ch4coandco2
AT grobneroswald moleculardesorptionbysynchrotronradiationandstickingcoefficienttemperaturesforh2ch4coandco2
AT grunhagelc moleculardesorptionbysynchrotronradiationandstickingcoefficienttemperaturesforh2ch4coandco2
AT jenningerb moleculardesorptionbysynchrotronradiationandstickingcoefficienttemperaturesforh2ch4coandco2

Ejemplares similares