Image currents in azimuthally inhomogeneous metallic beam pipes

Author

Caspers, F. ; Mostacci, A. ; Ruggiero, F. ; Palumbo, L.

Author_Institution

CERN, Geneva, Switzerland

Volume

3

fYear

2001

fDate

2001

Firstpage

1835

Abstract

We consider an ultra-relativistic particle travelling on-axis in an infinitely long cylindrical metallic beam pipe with azimuthally varying conductivity. A semi-analytical solution, obtained by applying approximate boundary conditions, predicts an image current distribution on the pipe walls practically independent of the azimuth, at least in the frequency range relevant for future machines such as the LHC. We discuss numerical simulations and bench measurements which confirm the theoretical predictions. Implications for the beam-induced ohmic losses in the copper coated, welded LHC beam screen are also addressed

Keywords

beam handling equipment; copper; particle accelerators; particle beam stability; protective coatings; shielding; Cu; LHC; approximate boundary conditions; azimuthally inhomogeneous metallic beam pipes; azimuthally varying conductivity; beam-induced ohmic losses; bench measurements; copper coated welded LHC beam screen; image current distribution; numerical simulations; pipe walls; ultrarelativistic particle; Azimuth; Boundary conditions; Conductivity; Copper; Current distribution; Frequency; Large Hadron Collider; Numerical simulation; Particle beams; Welding;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987199

Filename

987199