• E.R. Harms, T.T. Arkan, H.T. Edwards, M.H. Foley, A. Hocker, T.N. Khabiboulline, M.W. McGee, D.V. Mitchell, A.M. Rowe, N. Solyak
  Fermilab, Batavia
• W. Decking, M. Dohlus, M. Hüning, K. Jensch, G. Kreps, W.-D. Möller, E. Vogel
  DESY, Hamburg

A 4-cavity 3.9 GHz cryomodule has been constructed at Fermilab and delivered to DESY. Its intended use is to linearize the non-linear beam energy-time profile produced by the 1.3 GHz accelerating gradient and thus improve the operating characteristics of FLASH for its users. First cold testing of the module is expected in the near future prior to its installation. We will report on the performance of the cavities, assembly and transport of the module as well as anticipated testing, installation, and commissioning plans.

Slides

Talk

• P. Pierini, A. Bosotti, P.M. Michelato, L. Monaco, R. Paparella, D. Sertore
  INFN/LASA, Segrate (MI)
• E. Vogel
  DESY, Hamburg

Three superconducting 3.9 GHz cavity prototypes have been fabricated for the XFEL linac injector, with minor modifications to the RF structures built by FNAL for the FLASH linac. This paper describes the production procedures and RF preparation experience, the chemical processing and the plans for the vertical tests at INFN Milano for the characterization of the structures.

Poster