Title :
Broadband impedance of azimuthally symmetric devices in RHIC
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
Abstract :
The interaction between the beam and its environment leads to beam instabilities, and is characterized by coupling impedance. The longitudinal coupling impedance of some RHIC devices with azimuthal symmetry such as bellows, pipe transition, gate valve and collimator have been calculated numerically using the time domain code TBCI. The objective is to keep the broadband impedance below a threshold so that it satisfies the microwave stability criteria; and make sure there is no contribution to narrowband impedance from any of these structures
Keywords :
electric impedance; ion accelerators; particle beam diagnostics; storage rings; synchrotrons; RHIC; TBCI; azimuthally symmetric devices; beam instabilities; bellows; broadband impedance; collimator; coupling impedance; gate valve; longitudinal coupling impedance; microwave stability; narrowband impedance; pipe transition; time domain code; Bellows; Collimators; Electromagnetic heating; Fourier transforms; Impedance; Microwave devices; Optical coupling; Resonance; Resonant frequency; Valves;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309675
