Beam induced multipacting

Author

Gröbner, O.

Author_Institution

CERN, Geneva, Switzerland

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

3589

Abstract

Beam induced multipacting driven by the electric field of successive bunches, as first observed in the ISR proton-proton storage ring may arise from a resonance motion of a cloud of secondary electrons bouncing back and forth between opposite walls of the vacuum chamber. Under conditions where the average secondary electron yield of this process exceeds unity, the electron cloud may increase exponentially. A consequence for the vacuum system is strong electron stimulated gas desorption and the associated pressure increase which may affect the beam lifetime. A simple criterion for the onset of multipacting and an estimate of the average secondary electron yield is derived and will be applied to typical vacuum chambers and to the specific conditions found in the LHC

Keywords

colliding beam accelerators; electron stimulated desorption; particle beam bunching; proton accelerators; secondary electron emission; storage rings; vacuum apparatus; ISR proton-proton storage ring; LHC; Large Hadron Collider; beam induced multipacting; electric field; pressure increase; resonance motion; secondary electrons cloud; strong electron stimulated gas desorption; successive bunches; vacuum system; Clouds; Electron beams; Large Hadron Collider; Particle beams; Protons; Resonance; Steel; Storage rings; Structural beams; Vacuum systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.753283

Filename

753283