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Zinkann, G.P.

Paper Title Page
THP025 Superconducting Quarter-Wave Resonators for the ATLAS Energy Upgrade 836
  • M.P. Kelly, J.D. Fuerst, S.M. Gerbick, M. Kedzie, P.N. Ostroumov, K.W. Shepard, G.P. Zinkann
    ANL, Argonne

A set of six new 109 MHz β=0.15 superconducting quarter-wave resonators (QWR) has been built at ANL as part of an upgrade to the ATLAS superconducting heavy-ion linac. The final cavity string assembly will also use many of the techniques needed for the next generation of large high-performance ion linacs such as the U.S. Department of Energy's FRIB project. Single-cavity cold tests at T=4.5 K have been performed for three cavities with moveable coupler, rf pickup, and VCX fast tuner as required for the full 6-meter cryomodule assembly. The average maximum accelerating gradient of 4 cavities (3 new + 1 prototype), is EACC=11.2 MV/m (BPEAK=65 mT). Clean cavity string assembly techniques, required here and for most future SRF ion linacs, are fairly well developed. Details on cavity performance including high-field cw operation, microphonics and fast tuning are presented.