• S. Peggs, M. Eshraqi, H. Hahn, A. Jansson, M. Lindroos, A. Ponton, K. Rathsman, C.G. Trahern
  ESS, Lund
• S. Bousson
  IPN, Orsay
• R. Calaga
  BNL, Upton, Long Island, New York
• H. Danared
  MSL, Stockholm
• G. Devanz, R.D. Duperrier
  CEA, Gif-sur-Yvette
• J. Eguia
  Fundación TEKNIKER, Eibar (Gipuzkoa)
• S. Gammino
  INFN/LNS, Catania
• S.P. Møller
  ISA, Aarhus
• C. Oyon
  SPRI, Bilbao
• R.J.M.Y. Ruber
  Uppsala University, Uppsala
• T. Satogata
  JLAB, Newport News, Virginia

Following selection of Lund as the site for the long-pulse ESS (European Spallation Source), a team of accelerator and target experts has been working on an update of the 2003 ESS linac design. Improvements to the 2003 design will be summarised, and the latest designs for the linac will be presented.

Slides

• F. Gerigk, S. Atieh, S. Calatroni, O. Capatina, E. Ciapala, M. Eshraqi, L.M.A. Ferreira, R. Garoby, M. Hernandez Flano, W. Höfle, E. Lebbos, A.M. Lombardi, E. Montesinos, Th. Otto, V. Parma, P.A. Posocco, T. Renaglia, M. Schuh, V. Vlachoudis, W. Weingarten, S. Weisz
  CERN, Geneva
• R. Calaga
  BNL, Upton, Long Island, New York

During the past 2 years the Superconducting Proton Linac (SPL) study has grown into an international collaboration with the goal of optimising the architecture of a pulsed superconducting (SC) high-power proton linac. This effort includes the study and prototyping of major technical components, such as SC high-gradient cavities, power couplers, the RF distribution system, HOM couplers, cryo-modules, focusing elements, etc. Even though the effort is driven by CERN specific needs, the established design principles are valid for a range of superconducting linac projects. In this paper we report on the latests decisions concerning the machine architecture and on the ongoing R&D effort for technical components.

• G. Burt, P.K. Ambattu, A.C. Dexter
  Cockcroft Institute, Lancaster University, Lancaster
• R. Calaga
  BNL, Upton, Long Island, New York
• E. Montesinos
  CERN, Geneva

Multipactor is a limiting factor in many RF power couplers. The SPL coupler is proposed to have a conical matching section between the window and the coaxial section however this section must be checked for multipactor. Multipactor simulations of the coupler up to a few MW's of power were performed using a variety of different codes and the results were compared. Simulations were performed in the conical and straight coaxial sections.