Author: Sun, Y.-E.
Paper Title Page
MOP121 Experimental Studies on Coherent Synchrotron Radiation in the Emittance Exchange Line at the Fermilab A0 Photoinjector 322
 
  • J.C.T. Thangaraj, M.D. Church, H.T. Edwards, A.S. Johnson, A.H. Lumpkin, P. Piot, J. Ruan, J.K. Santucci, Y.-E. Sun, R.M. Thurman-Keup
    Fermilab, Batavia, USA
  
  Future accelerators will employ advanced beam conditioning systems such as emittance exchangers to manipulate high brightness beams. Coherent synchrotron radiation (CSR) in the dipoles could limit the performance of the emittance exchanger. In this paper, we report the experimental and simulation studies on measuring coherent synchrotron radiation and its effects on the beam at the A0 photoinjector in the emittance exchange line. We show how CSR can be used to measure bunch length of the beam. We also report on the diagnostic scheme based on a weak skew quad in the emittance exchange line to study the CSR effects on the beam and other beam dynamics.  
 
MOP219 Initial Beam-Profiling Tests with the NML Prototype Station at the Fermilab A0 Photoinjector 510
 
  • A.H. Lumpkin, M.D. Church, R.H. Flora, A.S. Johnson, J. Ruan, J.K. Santucci, V.E. Scarpine, Y.-E. Sun, R.M. Thurman-Keup, M. Wendt
    Fermilab, Batavia, USA
  
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Beam-profile diagnostics are being developed for a superconducting (SC) radiofrequency (RF) Test Accelerator that is currently under construction at the New Muon Lab (NML) at Fermilab. The facility’s design goals include the replication of the pulse train proscribed for the International Linear Collider (ILC). An RF photoelectric gun based on the DESY design will generate the beam. In test-beam mode a low-power beam will be characterized with intercepting radiation converter screens: either a 100-micron thick YAG:Ce single crystal scintillator or a 1-micron thin Al optical transition radiation (OTR) foil. This prototype station was constructed by RadiaBeam Technologies under a contract with Fermilab. In both cases the screen surface was normal to the beam direction followed by a downstream 45-degree mirror that directed the radiation into the optical system. The optical system has better than 20 (10) micron rms spatial resolution when covering a vertical field of view of 18(5) mm. These initial tests were performed at the A0 Photoinjector at a beam energy of ~15 MeV and with micropulse charges from 25 to 500 pC for beam sizes of 45 to 250 microns. Example results will be presented.

 
 
TUOCN4 Subpicosecond Electron Bunch Train Production Using a Phase-Space Exchange Technique 755
 
  • Y.-E. Sun, A.S. Johnson, A.H. Lumpkin, J. Ruan, R.M. Thurman-Keup
    Fermilab, Batavia, USA
  • T.J. Maxwell, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: The work was supported by the Fermi Research Alliance, LLC under the DOE Contract No. DE-AC02-07CH11359, and by Northern Illinois University under the DOE Contract No. DE-FG02-08ER41532.
Our recent experimental demonstration of a photoinjector electron bunch train with sub-picosecond structures is reported in this paper. The experiment is accomplished by converting an initially horizontal beam intensity modulation into a longitudinal phase space modulation, via a beamline capable of exchanging phase-space coordinates between the horizontal and longitudinal degrees of freedom. The initial transverse modulation is produced by intercepting the beam with a multislit mask prior to the exchange. We also compare our experimental results with numerical simulations. 		 
slides icon Slides TUOCN4 [1.761 MB]  
 
WEP036 Start-to-End Beam Dynamics Simulations for the SRF Accelerator Test Facility at Fermilab 1561
 
  • C.R. Prokop, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • M.D. Church, Y.-E. Sun
    Fermilab, Batavia, USA
  
  Funding: LANL Laboratory Directed Research and Development program 20110067DR. U.S. DoE contract No. DE-FG02-08ER41532 Northern Illinois University. Fermi Research Alliance, LLC Contract No. DE-AC02-07CH11359.
Fermilab is currently building a superconducting RF (SCRF) linear-accelerator test facility. In addition to testing ILC-spec SCRF accelerating modules for ILC and Project-X, the facility will be capable of supporting a variety of advanced accelerator R&D experiments. The accelerator facility includes a 40-MeV photoinjector capable of producing bunches with variable parameters. In this paper, we present start-to-end simulations of the accelerator beamline.