• T. Kamps, W. Anders, A. Frahm, J. Knobloch, O. Kugeler, A. Neumann, T. Quast, M. Schenk, M. Schuster
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin
• M. Dirsat
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin
• P. Kneisel
  JLAB, Newport News, Virginia
• R. Nietubyc
  The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
• T. Rao, J. Smedley
  BNL, Upton, Long Island, New York
• J.K. Sekutowicz
  DESY, Hamburg
• J. Teichert
  FZD, Dresden
• I. Will
  MBI, Berlin

In this paper we describe the R&D roadmap at HZB for the development of a high-brightness, high average current SRF electron gun for an energy-recovery linac based synchrotron radiation source.

• W. Anders, M. Abo-Bakr, T. Kamps, J. Knobloch, O. Kugeler, B.C. Kuske, A.N. Matveenko, A. Meseck, A. Neumann, T. Quast
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin

The HZB (previously BESSY) was the first institution in Germany to build and operate a dedicated synchrotron light source (BESSY I). About 10 years ago BESSY-II, a third generation synchrotron light source, was commissioned. Presently, HZB is developing a design for a future multi-user light source as a successor to BESSY II and to enable "next-generation" experiments. Such a facility will be based on the energy-recovery-linac (ERL) principle. Although ERL facilities exist for the IR and THz range their moderate parameters (current, emittance, energy) are insufficient for x-ray sources. HZB is therefore proposing to build a prototype ERL facility (BERLinPro) that will demonstrate high current and low emittance operation at 100 MeV. BERLinPro is intended to bring ERL technology to maturity so that it can be employed for x-ray light sources. This paper presents an overview of the projects and the key components of the facility.