Author: Rathke, J.
Paper Title Page
TUPPD080 Design of Ultrafast High-Brightness Electron Source 1587
  • J.H. Park, H. Bluem, J. Rathke, T. Schultheiss, A.M.M. Todd
    AES, Princeton, New Jersey, USA
  Funding: This work was supported by the U.S. Department of Energy, under Contract No. DE-SC0006210.
Generation and preservation of ultrafast electron beams is one of the major challenges in accelerator R&D. Space charge forces play a fundamental role in emittance dilution and bunch lengthening for all high brightness beams. In order to generate and preserve the ultrafast high-brightness electron beam, transverse and longitudinal space charge effects have to be considered. Several approaches to achieving ultra-short bunches have been explored such as velocity bunching and magnetic compression. However, each option suffers drawbacks in achieving a compact ultrafast high-brightness source. We present an alternative scheme to achieve an ultrafast high-brightness electron beam using a radial bunch compression technique in an x-band photocathode RF electron gun. By compensating the path length difference with a curved cathode and using an extremely high acceleration gradient (greater than 200 MV/m), we seek to deliver 100 pC, 100 fsec bunches.
TUPPP087 Commissioning of the Fritz Haber Institute Mid-IR FEL 1792
  • A.M.M. Todd, H. Bluem, D. Dowell, R. Lange, J.H. Park, J. Rathke, L.M. Young
    AES, Medford, NY, USA
  • W. Erlebach, S. Gewinner, H. Junkes, A. Liedke, G. Meijer, W. Schöllkopf, W.Q. Zhang, G. von Helden
    FHI, Berlin, Germany
  • S.C. Gottschalk
    STI, Washington, USA
  • K. Jordan
    Kevin Jordan PE, Newport News, Virginia, USA
  • U. Lehnert, P. Michel, W. Seidel
    HZDR, Dresden, Germany
  • R. Wünsch
    FZD, Dresden, Germany
  The IR and THz FEL at the Fritz Haber Institute (FHI) in Berlin is designed to deliver radiation from 4 to 400 microns. A single-plane-focusing undulator combined with a 5.4-m-long cavity is used is the mid-IR (< 50 micron), while a two-plane-focusing undulator in combination with a 7.2-m-long cavity with a 1-D waveguide for the optical mode is planned for the far-IR. Beam was delivered to the IR beam dump in November 2011. We describe progress since that time in completing the commissioning of the mid-IR beamline and the status of the far-IR beamline design and fabrication.