Study of SEY degradation of amorphous carbon coatings

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Abstract

Deposition of low secondary electron yield (SEY) carbon coatings by magnetron sputtering onto the inner walls of the accelerator seems to be the most promising solution for suppressing the electron cloud problem. However, these coatings change their electron emission properties during long term exposure to air. The ageing process of carbon coated samples with initial SEY of about 0.9 received from CERN is studied as a function of exposure to different environments. It is shown that samples having the same initial SEY may age with different rates. The SEY increase can be correlated with the surface concentration of oxygen. Annealing of samples in air at 100-200 °C reduces the ageing rate and even recovers previously degraded samples. The result of annealing is reduction of the hydrogen content in the coatings by triggering its surface segregation followed by desorption
Original languageEnglish
Title of host publicationECLOUD'12
Subtitle of host publicationJOINT INFN-CERN-EUCARD-ACCNET WORKSHOP ON ELECTRON-CLOUD EFFECTS
EditorsR. Cimino, G. Rumolo, F. Zimmermann
Place of PublicationGeneva
PublisherCERN
Pages149-152
ISBN (Print)978–92–9083–386–4
DOIs
Publication statusPublished - 2013
EventJoint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects (ECLOUD`12) - La Biodola, Isola d’Elba, Italy
Duration: 5 Jun 20129 Jun 2012

Publication series

NameCERN Reports
PublisherCERN
NumberCERN-2013-002
ISSN (Print)0007-8328

Conference

ConferenceJoint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects (ECLOUD`12)
Abbreviated titleECLOUD`12
CountryItaly
CityLa Biodola, Isola d’Elba
Period5/06/129/06/12

Keywords

  • FILMS

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