• F.J. Bermejo
  Bilbao, Faculty of Science and Technology, Bilbao
• I. Bustinduy
  ESS Bilbao, Bilbao
• J. Lucas
  Elytt Energy, Madrid

Funding: ESS-Bilbao Consortium

A baseline design for the proton linear accelerator as proposed by the European Spallation Source-Bilbao bid to host the installation (ESS-B) is here described. The new machine concept incorporates advances which have been registered within high power accelerators during the last decade. The design of such a new accelerator layout heavily relies upon low-beta superconducting spoke resonators which are already under development.

• Yu.A. Kubyshin, A. Crisol, X. Gonzalez Arriola, J.P. Rigla, F. Roure
  UPC, Barcelona
• A.V. Aloev, V.I. Shvedunov
  MSU, Moscow
• J. Berenguer Sau, G. Montoro
  EPSC, CASTELLDEFELS
• D. Carrillo, L. García-Tabarés, F. Toral
  CIEMAT, Madrid
• J. Lucas
  Elytt Energy, Madrid

A compact race-track microtron (RTM) with the maximal output energy 12 MeV is under construction at the Universitat Politècnica de Catalunya (UPC) in collaboration with the Skobeltsyn Institute of Nuclear Physics of the Moscow State University, CIEMAT and a few Spanish industrial companies and medical centers. The RTM end magnets are four-pole systems with the magnetic field created by a rare-earth permanent magnet material. As a source of electrons a 3D off-axis electron gun is used. These elements together with a C-band accelerating structure, dipole magnets, which allow to extract the electron beam with energy from 6 MeV to 12 MeV in 2 MeV step, and a focusing quadrupole are placed inside a vacuum chamber. We report on the current status of the technical design and results of tests of some of the components.