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Church, M.

Paper Title Page
TUP104 A High-Brightness Low-Energy Photoinjector Option for the Fermilab Electron Accelerator Facility 648
 
  • P. Piot, D. Mihalcea
    Northern Illinois University, DeKalb, Illinois
  • M. Church, S. Nagaitsev, Y.-E. Sun
    Fermilab, Batavia
  • I.V. Pogorelov
    LBNL, Berkeley, California
 
 

Funding: Work supported by Fermi Research Alliance LLC. Under DE-AC02- 07CH11359 with the U.S. DOE and by the Department of Education under contract P116Z010035 with Northern Illinois University
Fermilab is currently constructing a GeV-scale electron accelerator test facility. The accelerator will serve as a backbone for several Fermilab R&D programs, e.g., to test subsystem associated to project-X, ILC and the muon collider program. It is also anticipated that this facility will support beam physics and accelerator R&D programs such as testing of novel acceleration techniques, beam diagnostics and radiation sources concepts. In this paper we describe a possible option for the electron injector based on a photoemission rf gun. Optimization and performance studies of this ~50 MeV photoinjector are performed with various tracking programs (Astra, GPT, Impact-T, Impact-Z). We explore the performances of the magnetic bunch compressor which is extremely challenging at 50 MeV due to strong phase space dilution via collective effects (space charge and coherent synchrotron radiation). We also investigate the generation of flat beams with very high transverse emittance ratio using a round-to-flat beam transformer.

 
THP023 Crab Cavities for Linear Colliders 830
 
  • G. Burt, P.K. Ambattu, R.G. Carter, A.C. Dexter, M.I. Tahir
    Cockcroft Institute, Lancaster University, Lancaster
  • C. Adolphsen, Z. Li, A. Seryi, L. Xiao
    SLAC, Menlo Park, California
  • C.D. Beard, D.M. Dykes, P. Goudket, A. Kalinin, L. Ma, P.A. McIntosh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • L. Bellantoni, B. Chase, M. Church, T.N. Khabiboulline
    Fermilab, Batavia
  • R.M. Jones
    UMAN, Manchester
  • A. Latina, D. Schulte
    CERN, Geneva
 
 

Crab cavities have been proposed for a wide number of accelerators and interest in crab cavities has recently increased after the successful operation of a pair of crab cavities in KEK-B. In particular crab cavities are required for both the ILC and CLIC linear colliders for bunch alignment. Consideration of bunch structure and size constraints favours a 3.9 GHz superconducting, multi-cell cavity as the ILC solution, whilst bunch structure and beam-loading considerations suggest an X-band copper travelling wave structure for CLIC. These two cavity solutions are very different in design but share complex design issues. Phase stabilisation, beam loading, wakefields and mode damping are special issues for these crab cavities. Requirements and potential design solutions will be discussed for both colliders.