Title :
Measurements of higher order modes in 3rd harmonic RF cavity at Fermilab
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
We have measured the R/sub sQ for several higher order modes of the modified CERN 159 MHz RF cavity up to 1.5 GHz using bead-pull as well as stretched-wire methods. The data have been compared with the predictions of 2D code URMEL. Attempts have been made to investigate coupled-bunch instabilities that can arise from higher order modes of the cavity with the beam-on conditions. No resonances of the third harmonic cavity below 800 MHz were found to give rise to any noticeable beam instability.
Keywords :
"Radio frequency","Q measurement","Magnetic field measurement","Optical coupling","Impedance measurement","Magnetic resonance","Resonant frequency","Phase measurement","Laboratories","Perturbation methods"
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308774
