Title :
Quadrupole HOM damping with eccentric-fluted beam pipes
Author :
Sawamura, M. ; Furuya, T. ; Sakanaka, S. ; Suwada, T. ; Takahashi, T. ; Umemori, K. ; Sakai, H. ; Shinoe, K.
Author_Institution :
JAEA, Tsukuba
Abstract :
An eccentric-fluted beam pipe was proposed to damp quadrupole modes. The eccentric-flute acts as a mode converter from quadrupole to dipole. Optimized parameters permit to damp both degenerate modes of the quadrupole with the eccentric-flute. External Q-values measured with a low power model agreed well with those calculated with MAFIA.
Keywords :
accelerator cavities; beam handling techniques; MAFIA; cavity model; degenerate modes; dipole modes; eccentric-fluted beam pipes; external Q-value; higher order mode damping; low power model; quadrupole HOM damping; Cutoff frequency; Damping; Linear accelerators; Optical coupling; Power measurement; Refrigeration; Shape measurement; Shock absorbers; Synchrotrons; Threshold current;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440969
