Frequency control of RF booster cavity in TRIUMF

Author

Fong, K. ; Laverty, M.

Author_Institution

TRIUMF, Vancouver, BC, Canada

fYear

1993

fDate

17-20 May 1993

Firstpage

1139

Abstract

A booster cavity is used in the TRIUMF cyclotron to increase the energy gain per turn for beam orbits corresponding to energies greater than 370 MeV. It operates at 92.24 MHz, the 4th harmonic of the cyclotron main RF, and at a nominal voltage of 150 kV. Excitation is provided by a 90 kW RF system that is phase locked to the main RF. When the main RF is interrupted due to sparking or other causes, a controller built into the low level frequency source of the booster RF system disables the phase-locked loop, and reconfigures the source as a temperature stabilized oscillator operating at the last locked frequency. When the cyclotron RF is restored it usually will be at a different frequency. The oscillator tunes automatically to this new frequency. The acquisition time is extended by the controller to match the response time of the mechanical tuner in the cavity

Keywords

beam handling techniques; cavity resonators; cyclotrons; tuning; 150 kV; 370 MeV; 90 kW; 92.24 MHz; RF booster cavity; TRIUMF cyclotron; acquisition time; beam orbits; booster RF system; cyclotron main RF; energy gain per turn; frequency control; low level frequency source; mechanical tuner; nominal voltage; oscillator tuning; phase locked; phase-locked loop; response time; temperature stabilized oscillator; Automatic control; Control systems; Cyclotrons; Frequency control; Orbits; Oscillators; Phase locked loops; Radio frequency; Temperature control; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309040

Filename

309040