Title :
Image currents in azimuthally inhomogeneous metallic beam pipes
Author :
Caspers, F. ; Mostacci, A. ; Ruggiero, F. ; Palumbo, L.
Author_Institution :
CERN, Geneva, Switzerland
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;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987199
