Title :
An RF cavity for the B-factory
Author :
Rimmer, R. ; Voelker, F. ; Lambertson, G. ; Allen, M. ; Hodgeson, J. ; Ko, K. ; Pendleton, R. ; Schwarz, H. ; Kroll, N.
Author_Institution :
Lawrence Berkeley Lab., CA, USA
Abstract :
The authors describe the proposed design for the 476 MHz accelerating cavity for the Stanford linear Accelerator Center/Lawrence Berkeley Laboratory/Lawrence Livermore National Laboratory B-factory. Use of conventional construction in copper means that careful consideration has to be paid to the problem of cooling. The need for a high shunt impedance for the accelerating mode dictated the use of a reentrant shape. This maximized the impedance of the fundamental mode with respect to the troublesome longitudinal and deflecting higher order modes, when compared to open or bell-shaped designs. A specialized damping scheme was employed to reduce the higher-order mode impedances while sacrificing as little of the fundamental mode power as possible. This was required to suppress the growth of coupled bunch beam instabilities and minimize the workload of the feedback system needed to control them. A window design capable of handling the high power was also required.<>
Keywords :
beam handling equipment; cavity resonators; 476 MHz; B-factory; Cu; RF cavity; cooling; coupled bunch beam instabilities; damping scheme; design; feedback system; higher order modes; reentrant shape; window design; Acceleration; Cooling; Copper; Damping; Impedance; Linear accelerators; Optical coupling; Radio frequency; Shape; Structural beams;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164452