07 Cavity design
D. SRF Photoinjector
Paper Title Page
MOIOB02 Towards a 100mA Superconducting RF Photoinjector for BERLinPro 42
  • A. Neumann, W. Anders, A. Burrill, A. Jankowiak, T. Kamps, J. Knobloch, O. Kugeler, P. Lauinger, A.N. Matveenko, M. Schmeißer, J. Völker
    HZB, Berlin, Germany
  • G. Ciovati, P. Kneisel
    JLAB, Newport News, Virginia, USA
  • R. Nietubyć
    NCBJ, Świerk/Otwock, Poland
  • S.G. Schubert, J. Smedley
    BNL, Upton, Long Island, New York, USA
  • J.K. Sekutowicz
    DESY, Hamburg, Germany
  • V. Volkov
    BINP SB RAS, Novosibirsk, Russia
  • I. Will
    MBI, Berlin, Germany
  • E.N. Zaplatin
    FZJ, Jülich, Germany
  For BERLinPro, a 100 mA CW-driven SRF energy recovery linac demonstrator facility, HZB needs to develop a photo-injector superconducting cavity which delivers a at least 1mm*mr emittance beam at high average current. To address these challenges of producing a high peak brightness beam at high repetition rate, at first HZB tested a fully superconducting injector with a lead cathode*,followed now by the design of a SC cavity allowing operation up to 4 mA using CW-modified TTF-III couplers and inserting a normal conducting high quantum efficiency cathode using the HZDR-style insert scheme. This talk will present the latest results and an overview of the measurements with the lead cathode cavity and will describe the design and optimization process, the first production results of the current design and an outlook to the further development steps towards the full power version.
*T. Kamps et al., Proceedings of the 2nd International Particle Accelerator Conference, San Sebastián, Spain, 2011.
slides icon Slides MOIOB02 [7.574 MB]  
MOP024 Novel SRF Gun Design 145
  • F. Marhauser
    Muons, Inc, Illinois, USA
  • K.H. Lee, Z. Li
    SLAC, Menlo Park, California, USA
  Funding: Work supported under U.S. DOE Grant Application Number 98802B12-I
A high brightness superconducting radio frequency (SRF) photoinjector gun cavity has been developed to a level ready for construction. The design aims to prevent operational limitations encountered with existing concepts.
FRIOA03 Fabrication and Testing of Deflecting Cavities for APS 1170
  • J.D. Mammosser
    JLab, Newport News, Virginia, USA
  • P. Dhakal, J. Henry, R.A. Rimmer, H. Wang, K.M. Wilson
    JLAB, Newport News, Virginia, USA
  • J.F. Fuerst, J.P. Holzbauer, J.S. Kerby, A. Nassiri, G.J. Waldschmidt, G. Wu, Y. Yang
    ANL, Argonne, USA
  • F. He
    PKU, Beijing, People's Republic of China
  • Z. Li
    SLAC, Menlo Park, California, USA
  Abstract Jefferson Lab in Newport News, Virginia, in collaboration with Argonne National Laboratory, Argonne, Il, has fabricated and tested three production, 2.815 GHz crab cavities for Argonne’s Short-Pulse X-ray project. These cavities are unique in that the cavity and waveguides were milled from bulk large grain niobium ingot material directly from 3D CAD files. No forming of sub components was used with the exception of the beam-pipes. The cavity and helium vessel design along with the RF performance requirements makes this project extremely challenging for fabrication. Production challenges and fabrication techniques as well as testing results will be discussed in this paper.  
slides icon Slides FRIOA03 [22.677 MB]  
FRIOA04 Superconducting RF-Dipole Deflecting and Crabbing Cavities 1176
  • S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  Recent interests in designing compact deflecting and crabbing structures for future accelerators and colliders have initiated the development of novel rf structures. The superconducting rf-dipole cavity is one of the first compact designs with attractive properties such as higher gradients, higher shunt impedance, the absence of lower order modes and widely separated higher order modes. Two rf-dipole designs of 400 MHz and 499 MHz have been designed, fabricated and tested as proof-of-principle designs of compact deflecting and crabbing cavities for the LHC high luminosity upgrade and Jefferson Lab 12 GeV upgrade. The first rf tests have been performed on the rf-dipole geometries at 4.2 K and 2.0 K in a vertical test assembly with excellent results. The cavities have achieved high gradients with high intrinsic quality factors, and multipacting levels were easily processed.  
slides icon Slides FRIOA04 [6.218 MB]