Title :
The HOM study of CESR RF cavities using single circulating bunch
Author :
Temnykh, A. ; Hartill, D. ; Belomestnykh, S. ; Kaplan, R.
Author_Institution :
Lab. of Nucl. Studies, Cornell Univ., Ithaca, NY, USA
Abstract :
The CESR RF system consists of four 5-cell RF cavities. Each cell has a field probe sensitive to the voltage in the cell. We used a single bunch circulating in the ring as the driving current which gives a well known spectrum. The signals from the field probes were analyzed and we were able to identify the peaks seen in the spectra as higher-order modes (HOMs) that are excited by the beam in RF cavities. Analysis of the peak shapes and location gave us the Q factors of parasitic modes and their frequencies. The reliability of data was verified with direct measurement using a Network analyzer. The information about Qs and frequencies of the parasitic modes will be used for the multi-bunch beam stability analysis
Keywords :
accelerator cavities; electron accelerators; particle beam bunching; particle beam stability; storage rings; CESR RF cavities; Network analyzer; RF cavities; driving current; higher-order modes; multi-bunch beam stability analysis; parasitic modes; single circulating bunch; Probes; Q factor; RF signals; Radio frequency; Radiofrequency identification; Shape; Signal analysis; Signal processing; Stability analysis; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750812
