Author: Folsom, B.T.
Paper Title Page
TUPAB175 ESSnuSB Linac and Transfer Line: Lattice Design and Error Studies 1805
 
  • N. Blaskovic Kraljevic, M. Eshraqi, B.T. Folsom
    ESS, Lund, Sweden
 
  Funding: ESSnuSB has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.
The ESS neutrino superbeam (ESSnuSB) project is being studied as an upgrade to the European Spallation Source (ESS). This proposed upgrade consists of adding an H source to the existing beamline in order to send H pulses in between proton pulses, effectively doubling the beam power from 5 MW to 10 MW. In this contribution, we present the 2.5 GeV linear accelerator (linac) lattice and the design of the transfer line from the linac to the accumulator ring, where pulses would be stacked to achieve short proton pulses of high intensity. The results of error studies, quantifying the effect of accelerator imperfections and H ion stripping losses on the beam transport through the linac and transfer line, are also presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB175  
About • paper received ※ 19 May 2021       paper accepted ※ 14 June 2021       issue date ※ 31 August 2021  
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TUPAB218 Fully Covariant Two-Particle Space-Charge Dynamics Using the Liénard-Wiechert Potentials 1931
 
  • B.T. Folsom, E. Laface
    ESS, Lund, Sweden
 
  Space charge models typically assume instantaneous propagation of the electromagnetic fields between particles in a bunch, describing forces in the frame of the reference particle. In this paper, we construct a space-charge tracking code from the retarded Liénard-Wiechert potentials, which are covariant by design, in a Lagrangian formulation. Such potentials are manipulated with covariant derivatives to produce the necessary equations of motion that will be solved in a test system of two particles at various relative energies. Magnetic dipole moment dynamics are also evaluated where applicable.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB218  
About • paper received ※ 19 May 2021       paper accepted ※ 19 July 2021       issue date ※ 11 August 2021  
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TUPAB237 Symplectic Tracking Through Field Maps 1992
 
  • S.D. Webb
    RadiaSoft LLC, Boulder, Colorado, USA
  • B.T. Folsom, E. Laface, R. Miyamoto
    ESS, Lund, Sweden
 
  For many applications, it is necessary to track particles using field maps, instead of an analytic representation of the fields which is typically not available. These field maps come about while designing elements such as realistic magnets or radiofrequency cavities, and represent the field geometry on a mesh in space. However, simple interpolation of the fields from the field maps does not guarantee that the resulting tracking scheme satisfies the symplectic condition. Here we present a general method to decompose the field-map potential in the sum of interpolating functions that produces, by construction, a symplectic integrator.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB237  
About • paper received ※ 19 May 2021       paper accepted ※ 22 July 2021       issue date ※ 22 August 2021  
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