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Fong, K.

Paper Title Page
WEPMN002 Tuner Control in TRIUMF ISAC 2 Superconducting RF System 2047
  • K. Fong, M. P. Laverty, Q. Zheng
    TRIUMF, Vancouver
  The TRIUMF ISAC 2 superconducting RF system operates on self-excited, phase locking mode. A mechanical tuner is used to minimize the required RF power. The tuner derives the tuning information from the phase shift around the self-excited loop. Its accuracy is however reduced by phase drift in the amplifier due to thermal effects. Cross correlation between the In-phase and the Quadrature-phase errors is used to detect this drift. A Kalman filter is used to combine these information to control the movement of the tuner.  
FROAC02 RF Amplifier Choice for the ISAC Superconducting Linac 3798
  • I. V. Bylinskii, K. Fong, J. Lu, A. K. Mitra, C. Owen
    TRIUMF, Vancouver
  A superconducting linac is being commissioned at TRIUMF as an extension to the existing room temperature accelerator of exotic ions at ISAC. It will increase the isotope final energy from 1.5 to 6.5 MeV/u. Acceleration is accomplished in 40 bulk niobium quarter wave superconducting cavities operating at 106 and 141 MHz. Each cavity is energized from an independent RF amplifier with power rating up to 1 kW cw. Both vacuum tube and solid state amplifiers were considered as a viable option for the drivers. The paper compares many important parameters of these 2 amplifiers such as reliability, serviceability, capital and maintenance costs, as well as operating characteristics: gain linearity, phase noise, phase drift and others. Test results of prototypes of both types of amplifiers and 1 year operational experience of 20 tube amplifiers are discussed. Based on that the amplifier design requirements are formulated.  
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