• R.A. Rimmer, W.A. Clemens, J. Henry, P. Kneisel, K. Macha, F. Marhauser, L. Turlington, H. Wang
  JLAB, Newport News, Virginia

JLab has designed and fabricated several prototype SRF cavities with cell shapes optimized for high current beams and with strong damping of unwanted higher order modes. We report on the latest test results of these cavities and on developments of concepts for new variants optimized for particular applications such as light sources and high-power proton accelerators, including betas less than one. We also report on progress towards a first beam test of this design in the recirculation loop of the JLab ERL based FEL. With growing interest worldwide in applications of SRF for high-average power electron and hadron machines, a practical test of these concepts is highly desirable. We plan to package two prototype cavities in a de-mountable cryomodule for temporary installation into the JLab FEL for testing with RF and beam. This will allow verification of all critical design and operational parameters paving the way to a full-scale prototype cryomodule.

• P. Frigola, R.B. Agustsson, L. Faillace
  RadiaBeam, Marina del Rey
• W.A. Clemens, J. Henry, F. Marhauser, R.A. Rimmer, A.T. Wu, X. Zhao
  JLAB, Newport News, Virginia
• O. Harrysson, T. Horn, K. Knowlson, T. Mahale, G. Prasanna
  NCSU, Raleigh, North Carolina
• F. Medina, R.B. Wicker
  University of Texas El Paso, W.M. Keck Center for 3D Innovation, El Paso, Texas
• L.E. Murr
  University of Texas at El Paso, El Paso, Texas

A key issue for high average power, normal conducting radio frequency (NCRF), photoinjectors is efficient structure cooling. To that end, RadiaBeam has been developing the use of Solid Freeform Fabrication (SFF) for the production of NCRF photoinjectors. In this paper we describe the preliminary design of a high gradient, very high duty cycle, photoinjector combining the cooling efficiency only possible through the use of SFF, and the RF efficiency of a re-entrant gun design. Simulations of the RF and thermal-stress performance will be presented, as well as material testing of SFF components.