Author: Gold, G.
Paper Title Page
TU2PB04 Resonator System for the BEST 70 MeV Cyclotron 153
  • V. Sabaiduc, G. Gold, B.A. Versteeg
    BCSI, Vancouver, Canada
  • J. Panama
    Best Theratronics Ltd., Ottawa, Ontario, Canada
  Best Cyclotron Systems Inc. is presently developing a 70 MeV cyclotron for radioisotope production and research purpose. The RF system comprises two separated resonators driven by independent amplifiers to allow for the phase and amplitude modulation technique to be applied for beam intensity modulation. The resonators are presently in the commissioning phase consisting of cold test measurements followed by high power commissioning in the cyclotron. Preliminary simulation results have been reported and are: 56MHz operation (fourth harmonic, half-wave resonator design), 60 to 70kV dee voltage, quality factor 8000 with the estimated dissipated power of 17kW per resonator. The electromagnetic modeling has been done with CST Microwave Studio. All simulation results showed a very conservative design with typical parameters for the energy and size of the resonators. The paper will present the measurement results on a cold test set-up configuration as well as the commissioning with high power in the cyclotron.  
slides icon Slides TU2PB04 [4.920 MB]  
TUPPT024 Design of a Digital Low-Level RF System for BEST Medical Cyclotrons 203
  • G. Gold, V. Sabaiduc
    BCSI, Vancouver, BC, Canada
  A versatile digital low-level RF system has been designed for the range of cyclotrons being developed by Best Cyclotron Systems Inc. (BCSI). Primary design considerations are given to robustness, low cost and the flexibility to be used on all BCSI resonator designs. As such, the system allows for operating frequency selection from 49 to 80 MHz and is compatible with single or double resonator configurations through the use of local oscillator synchronization and high-speed command exchange. An IQ demodulation/modulation scheme is employed allowing for frequency and amplitude control. High-speed phase control of separated resonators allows for beam intensity modulation techniques to be applied. This paper discusses the overall system design as well as integration results on both a single and double resonator cyclotron.  
TUPPT025 Resonator System for the BCSI Test Stand Cyclotron 206
  • G. Gold, V. Sabaiduc, J. Zhu
    BCSI, Vancouver, Canada
  • J. Panama
    Best Theratronics Ltd., Ottawa, Ontario, Canada
  • L. AC. Piazza
    INFN/LNL, Legnaro (PD), Italy
  Best Cyclotron Systems Inc. is presently developing a test facility for beam injection into a center region cyclotron operating at maximum 1MeV. The test stand cyclotron will operate at various fixed frequencies that will cover the entire range from 49MHz to 80MHz as estimated for the current cyclotron models under development at BCSI. The resonator was designed with a variable coaxial section allowing for the frequency to be continuously adjusted as required for the particular model in study. Having interchangeable dee tip geometries presented various thermal management challenges which have been addressed. Three operational frequencies, 49MHz, 56MHz and 73MHz have been simulated with CST Microwave Studio. The paper will report the theoretical parameters of the cavity, mechanical design considerations and resonator commissioning on the first operational frequency of 49MHz.