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Singh, K.

Paper Title Page
THP017 Use of Piezoelectric Actuator to Frequency Lock Superconducting Quarter Wave Resonator 815
  • B.K. Sahu, G.K. Chowdhury, S. Ghosh, D. Kanjilal, D.S. Mathuria, R. Mehta, A. Pandey, P. Patra, A. Rai, A. Roy, K. Singh
    IUAC, New Delhi

The frequency control of the superconducting quarter wave resonator at IUAC is currently accomplished by mechanical and electronic tuners which are operated in the time scale of seconds and hundreds of milliseconds to a few tens of microseconds respectively. Due to presence of microphonics, input rf power in the range 200-300 W was required to control the resonator for a typical field of 3-5 MV/m achieved with 6 watts dissipation. Implementation of a novel idea to damp the mechanical vibration with the help of SS-balls has helped to reduce rf power below 100 W. Though resonators are working fine at this power level, we are investigating whether further reduction of rf power is possible using a piezo actuator to control the drift of frequency. The piezo tuner working in hundreds of milli seconds range with the dynamic phase control scheme will share a substantial load from the electronic tuner. As a result, the resonator's phase lock loop will remain locked for less rf power. The initial test results of the piezo tuner will be presented.