Title :
Beam coupling impedances of obstacles protruding into beam pipe
Author :
Kurennoy, Sergey S.
Author_Institution :
LANSCE-1, Los Alamos Nat. Lab., NM, USA
Abstract :
The beam coupling impedances of small obstacles protruding inside the vacuum chamber of an accelerator are calculated analytically at frequencies for which the wavelength is large compared to a typical size of the obstacle. Simple formulas for a few important particular cases, including both essentially three-dimensional objects like a post or a mask and axisymmetric irises, are presented. The analytical results are compared and agree with three-dimensional computer simulations. These results allow simple practical estimates of the broad-band impedance contributions from such discontinuities
Keywords :
beam handling techniques; high energy physics instrumentation computing; particle accelerators; vacuum apparatus; 3D computer simulations; axisymmetric irises; beam coupling impedances; beam pipe; broad-band impedance contributions; discontinuities; mask; particle accelerator; post; protruding obstacles; small obstacles; vacuum chamber; Computer simulation; Frequency; Impedance; Laboratories; Large Hadron Collider; Magnetic moments; Optical coupling; Particle beams; Polarization; Waveguide discontinuities;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750819
