Record Surface Fields in QWR Cavities and Its Impact on World Trends in Heavy-Ion Superconducting Accelerators
- Zachary Conway, Argonne National Laboratory (ANL)
Thursday, April 25, 11:00 AM - Special Seminar
NSCL Lecture Hall
Since its inception superconducting RF (SRF) technology has been increasingly adopted in modern accelerators including ATLAS at Argonne, ISAAC II at TRIUMF, and the Spallation Neutron Source at Oak Ridge. SRF technology is also widely used in recently proposed accelerator projects including the FRIB project at MSU, the European Spallation Source at Lund, the Project-X at Fermi, and various Accelerator-driven subcritical programs for waste transmutation and energy production. Recent developments at Argonne focusing on SRF technology for low-velocity (b = v/c < 0.1) hadron beams been developed reaching world record accelerating fields for this resonator class. This presentation reports on the development and testing of a superconducting quarter-wave resonator. The quarter-wave resonator is designed for beta = 0.077 ions, operates at 72 MHz and can provide more than 7.4 MV of accelerating voltage at the design beta, with peak surface fields of 165 mT and 117 MV/m. Operation was limited to this level not by RF surface defects but by our administrative limits on x-ray production. Current applications for this resonator and how its performance compares to current state-of-the-art superheating field measurements will also be discussed.