Electron Cloud Driven Vacuum Instability

Electron clouds are shown to cause pressure rises in the Relativistic Heavy Ion Collider. In a number of cases beam induced vacuum instabilities were seen where the pressure grows exponentially with time. We analyze under which conditions electron clouds can lead to these vacuum instabilities. We co...

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Bibliographic Details
Main Authors: Fischer, W, Iriso, U
Format: Conference Proceeding
Language:English
Subjects:
ACCELERATION
BEAM DYNAMICS
BROOKHAVEN RHIC
COLLIDING BEAMS
DESORPTION
ELECTRON BEAMS
ELECTRONS
FEEDBACK
INSTABILITY
IONIZATION
IONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
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Summary:Electron clouds are shown to cause pressure rises in the Relativistic Heavy Ion Collider. In a number of cases beam induced vacuum instabilities were seen where the pressure grows exponentially with time. We analyze under which conditions electron clouds can lead to these vacuum instabilities. We consider as the feedback mechanism for the instability the following: rest gas ionization by electrons in the cloud and the beam, subsequent acceleration of the ions by the beam, and molecular desorption induced by the ions hitting the wall, leading to increased pressure and thus higher ionization rates.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1949528