Fabrication and performance of superconducting RF cavities for the cornell ERL injector

Six 1300 MHz superconducting niobium 2-cell cavities are manufactured in-house for the prototype of the Cornell ERL injector to boost the energy of a high current, low emittance beam produced by a DC gun. Designed for high current beam acceleration, these cavities have new characteristics as compared to previously developed low-current cavities such as those for TTF Precision manufacture is emphasized for a better straightness of the cavity axis so as to avoid unwanted emittance dilution. We present the manufacturing, processing and vertical test performance of these cavities. We also present the impact of new cavity characteristics to the cavity performance as learnt from vertical tests.

[1]  S. Belomestnykh,et al.  Dipole-mode-free and kick-free 2-cell cavity for the SC ERL injector , 2003, Proceedings of the 2003 Particle Accelerator Conference.

[2]  Maury Tigner,et al.  Overview of the Cornell ERL injector cryomodule , 2003, Proceedings of the 2003 Particle Accelerator Conference.

[3]  Maury Tigner,et al.  AN OVERVIEW OF THE CRYOMODULE FOR THE CORNELL ERL INJECTOR , 2004 .

[4]  H. Padamsee,et al.  Progress of 2-Cell Cavity Fabrication for Cornell ERL Injector , 2005, Proceedings of the 2005 Particle Accelerator Conference.