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TUP104 |
A High-Brightness Low-Energy Photoinjector Option for the Fermilab Electron Accelerator Facility
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648 |
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- P. Piot, D. Mihalcea
Northern Illinois University, DeKalb, Illinois
- M. Church, S. Nagaitsev, Y.-E. Sun
Fermilab, Batavia
- I.V. Pogorelov
LBNL, Berkeley, California
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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.
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THP023 |
Crab Cavities for Linear Colliders
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830 |
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- 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
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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.
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