CERN Accelerating science

Preprint
Report number	arXiv:1609.03495
Title	Single beam collective effects in FCC-ee due to beam coupling impedance
Related title	Single beam collective effects in FCC-ee due to beam coupling impedance
Author(s)	Belli, Eleonora (Rome U. ; INFN, Rome) ; Migliorati, Mauro (Rome U. ; INFN, Rome) ; Persichelli, Serena (LBNL, Berkeley) ; Zobov, Mikhail (Frascati)
Publication	2016
Imprint	12 Sep 2016
Number of pages	27
Subject category	Accelerators and Storage Rings
Abstract	The Future Circular Collider study, hosted by CERN to design post-LHC particle accelerator options in a worldwide context, is focused on proton-proton high-energy and electron-positron high-luminosity frontier machines. This new accelerator complex represents a great challenge under several aspects, which involve R&D; on beam dynamics and new technologies. One very critical point in this context is represented by collective effects, generated by the interaction of the beam with self-induced electromagnetic fields, called wake fields, which could produce beam instabilities, thus reducing the machines performance and limiting the maximum stored current. It is therefore very important to be able to predict these effects and to study in detail potential solutions to counteract them. In this paper the resistive wall and some other important geometrical sources of impedance for the FCC electron-positron accelera- tor are identified and evaluated, and their impact on the beam dynamics, which in some cases could lead to unwanted instabilities, is discussed.
Other source	Inspire
Copyright/License	arXiv nonexclusive-distrib. 1.0