Title :
Reduced length design of 9.8 MHz RF accelerating cavity for the Positron Accumulator Ring (PAR) of the Advanced Photon Source (APS)
Author :
Kang, Y.W. ; Bridges, J.F. ; Kustom, R.L.
Author_Institution :
Accel. Syst. Div., Argonne Nat. Lab., IL, USA
Abstract :
A 9.8-MHz RF accelerating cavity is developed for the first harmonic system in the APS PAR and an aluminum unit is tested. The design goal is 40 kV at the accelerating gap, Q-factor of ~7,000 for the accelerating mode, 1.2-m diameter, 1.6-m length with good mechanical strength and stability. The design employs no dielectric or ferrite loading for tuning. The cavity is a plunger-loaded reentrant coaxial structure; the end of the inner conductor facing the wall has a piston-shaped loading structure which consists of a circular disk and a cylinder. The RF characteristic of the cavity was investigated using the URMEL-T and MAFIA programs. Compared with a coaxial structure with lumped element capacitive loading, this design gives improved RF characteristics
Keywords :
beam handling equipment; beam handling techniques; cavity resonators; electron accelerators; physics computing; storage rings; tuning; 1.2 m; 1.6 m; 40 kV; 9.8 MHz; 9.8 MHz RF accelerating cavity; APS; APS PAR; Advanced Photon Source; Al; Al unit; MAFIA program; PAR; Positron Accumulator Ring; Q-factor; URMEL-T program; accelerating gap; circular disk; cylinder; first harmonic system; lumped element capacitive loading; mechanical strength; piston-shaped loading structure; plunger-loaded reentrant coaxial structure; stability; tuning; Acceleration; Aluminum; Coaxial components; Dielectrics; Ferrites; Life estimation; Q factor; Radio frequency; Stability; System testing;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308732
