Author: Webb, S.D.
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TUA3CO04
 Kinetic Limits to Average Power in Plasma Wakefield Accelerators  
 
  • S.D. Webb
    RadiaSoft LLC, Boulder, Colorado, USA
  
  Funding: Air Force Office of Scientific Research, Young Investigator Program, under contract no. FA9550-15-C-0031. Distribution Statement A. Approved for public release; distribution is unlimited.
We present the effects of beam loading and plasma kinetics on the length of the wake in a beam-driven plasma wakefield accelerator in the blowout regime. This allows us to estimate the limits to the average beam power available to a plasma wakefield accelerator. 		 
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WEA2IO02
 Proposed Experimental Validation of Hamiltonian Perturbation Theory in IOTA  
 
  • D.L. Bruhwiler, N.M. Cook, C.C. Hall, R.A. Kishek, S.D. Webb
    RadiaSoft LLC, Boulder, Colorado, USA
  • S. Nagaitsev, A.L. Romanov, A. Valishev
    Fermilab, Batavia, Illinois, USA
  
  The Integrable Optics Test Accelerator (IOTA) is a small ring under construction to explore advanced concepts in beam dynamics, initially with electron pencil beams to emulate single-particle dynamics and later with low-energy proton beams including significant space charge tune depression. Hamiltonian perturbation theory and simulations with Synergia, Warp and other codes are being used to develop an experimental program for beam dynamics, including the highly nonlinear 'elliptic' magnet originally proposed by Danilov and Nagaitsev. The results suggest a number of experiments that could be performed at IOTA. For example, small changes in the linear tune and the strength of the elliptic magnet can be used to control dynamic aperture. Both electron and proton beams can be used to measure the tune spread as a function of the elliptic magnet strength, for comparison with theory. Space charge driven halo formation due to envelope oscillations can be measured over a range of elliptic magnet strengths. Theoretical and computational results will be presented to guide future decisions regarding experimental diagnostics for IOTA.  
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WEA4CO02
 Impact of Space Charge on Beam Dynamics and Integrability in the IOTA Ring  
 
  • C.C. Hall, D.L. Bruhwiler, N.M. Cook, R.A. Kishek, S.D. Webb
    RadiaSoft LLC, Boulder, Colorado, USA
  • A.L. Romanov, A. Valishev
    Fermilab, Batavia, Illinois, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0011340.
Modern hadron accelerators such as spallation sources and neutrino factories must push the intensity limits to meet increasingly challenging goals. The Integrable Optics Test Accelerator (IOTA) is a small ring, currently under construction at Fermilab, which will explore advanced concepts in beam dynamics with low-energy proton beams with high space charge tune depression. Through use of a special nonlinear magnet insertion, large tune spread with amplitude can be achieved while preserving two integrals of motion for the single particle behavior. The tune shift and spread induced by space charge can disrupt the stability of these invariants. In this work we examine the behavior of these invariants in the presence of space charge. Simulations of a modified IOTA lattice that accounts for the space charge tune depression are shown, and the behavior of the invariants is examined. 		 
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