17–22 Jun 2018
Europe/Zurich timezone
15th European Vacuum Conference

Electron stimulated desorption yield of technical materials used in the LHC vacuum system

19 Jun 2018, 16:50
1h 30m
Main Lobby (CICG)

Main Lobby

CICG

Poster Surface Science & Applied Surface Science Poster Session Tuesday

Speaker

Simone Callegari (CERN)

Description

In 2017, LHC overcame the target for integrated luminosity achieving the goal of 125 fb-1 since the start of its operation. All along this period LHC vacuum system successfully faced the challenge of the pressure instabilities generated by electron clouds. In this framework Electron Stimulated Desorption (ESD) studies revealed to be fundamental for dynamic pressure prediction and limitation.
This article presents a summary of laboratory investigations performed in support of beam vacuum operation team on electron stimulated desorption for technical materials. The phenomenon of loss of conditioning was deeply analysed in different operation conditions: static vacuum effect was considered together with the effect of different venting techniques according to standard and non-standard vacuum operation procedures. In case of NEG-coated sample, the effects of partial activation and different saturation effects were analysed, too.

Author

Simone Callegari (CERN)

Co-authors

Christina Yin Vallgren (CERN) Giuseppe Bregliozzi (CERN) Paolo Chiggiato (CERN)

Presentation materials

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