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Liu, Z.

Paper Title Page
WEPMS087 Conceptual Design of an L-Band Recirculating Superconducting Traveling Wave Accelerating Structure 2538
 
  • A. Kanareykin, P. V. Avrakhov, Z. Liu
    Euclid TechLabs, LLC, Solon, Ohio
  • W. Gai
    ANL, Argonne, Illinois
  • S. Kazakov
    KEK, Ibaraki
  • N. Solyak
    Fermilab, Batavia, Illinois
  • V. P. Yakovlev
    Omega-P, Inc., New Haven, Connecticut
 
  Funding: This research is supported by the US Department of Energy

We describe a conceptual design for a superconducting traveling wave accelerator for the ILC. The RF feedback system plus phase shifter can redirect the accelerating wave that passed through the STWA section back to the input of the accelerating structure. In this paper, the STWA cell shape optimization, coupler cell design and rat race ring coupler in the feedback loop are presented. The STWA cell shape is similar to the LL cavity with a 60 mm disk diameter. A 9-cell STWA operates at the mode with group velocity as low as 0.0106 c. Both the ratio of peak electric field and magnetic field to the axial electric field are smaller than in the TESLA 9-cell cavity. The STWA structure has more cells per unit length than a TESLA structure but provides an accelerating gradient higher than a TESLA structure, consequently reducing the cost. The designed rat race directional coupler with four ports has ?3 dB direct coupling coefficients, 16.5 MHz bandwidth between ?30 dB isolations and 1.1 MHz bandwidth between ?30 dB reflection coefficients. Effects of the mechanical tolerances are also discussed.