Title :
The fundamental power coupler prototype for the Spallation Neutron Source (SNS) superconducting cavities
Author :
Campisi, I.E. ; Daly, E.F. ; Henry, J.E. ; Kneisel, P. ; Schneider, W.J. ; Stirbet, M. ; Wilson, K.M.
Author_Institution :
TJNAF, Newport News, VA, USA
Abstract :
The SNS linac contains superconducting cavities with β.61 and .81 for the acceleration of H- ions. Each of the 6-cell cavities, resonant at 805 MHz at 2.1 K, is powered by a 550-kW pulsed klystron via a coaxial coupler. The specifications for the fundamental power coupler (FPC) require that it withstand the full klystron power in full reflection for the duration of the RF pulse (1.3+0.15 [decay] ms) at a repetition rate of 60 pps with an average power of 48 kW. The FPC must provide a Qext of 7.3×105 and 7.0×105 for the medium-β and high-β cavities, respectively. A design derived from proven experience at other laboratories (primarily at KEK, for Tristan and KEK-B cavities at 508 MHz) has been adopted for the prototypes of the FPCs. The 50-Ω coaxial line is scaled directly from 508 MHz to the SNS frequency of 805 MHz
Keywords :
accelerator RF systems; accelerator cavities; ion accelerators; klystrons; linear accelerators; superconducting cavity resonators; 2.1 K; 508 MHz; 550 kW; 805 MHz; SNS linac; Spallation Neutron Source superconducting cavities; coaxial line; fundamental power coupler; fundamental power coupler prototype; klystron power; pulsed klystron; Acceleration; Coaxial components; Flexible printed circuits; Klystrons; Linear particle accelerator; Neutrons; Prototypes; Reflection; Resonance; Superconducting devices;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.986606
