Keyword: focusing
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MOPA19 The Effect of the Main Injector Ramp on the Recycler dipole, operation, shielding, quadrupole 90
  • N. Chelidze, R. Ainsworth, K.J. Hazelwood
    Fermilab, Batavia, Illinois, USA
  The Recycler and Main Injector are part of the Fermilab Accelerator complex used to deliver a high power proton beam. Both machines share the same enclosure with the Recycler mounted 6 ft above the Main Injector. The Main Injector accelerates beam from 8 GeV to 120 GeV. While the majority of the Recycler has mu metal shielding, the effect of the Main Injector ramp is still significant and can affect both the tunes and the orbit. In this paper, we detail the size of these effects.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA19  
About • Received ※ 02 August 2022 — Accepted ※ 04 August 2022 — Issue date ※ 23 August 2022  
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TUPA26 Fringe Field Maps for Cartesian Dipoles with Longitudinal and/or Transverse Gradients dipole, quadrupole, photon, lattice 401
  • R.R. Lindberg, M. Borland
    ANL, Lemont, Illinois, USA
  Funding: This work was supported by U.S. Dept. of Energy Office of Sciences under Contract No. DE-AC02-06CH11357.
Fringe fields effects in dipoles can give rise to important linear and nonlinear contributions. This paper describes how to extend the classic results of Brown [1] and the more recent calculations of Hwang and Lee [2] to Cartesian dipoles with transverse and/or longitudinal gradients. We do this by 1) introducing a more general definition of the fringe field that can be applied to longitudinal gradient dipoles, 2) allowing for quadrupole and/or sextupole content in the magnet body, and 3) showing how to employ the resulting fringe field maps as a symplectic transformation of the coordinates. We compare our calculation results with tracking for longitudinal and transverse gradient dipoles planned for the APS-U.
[1] K.L. Brown, Report SLAC-75, 1982.
[2] K. Hwang and S.Y. Lee, Phys. Rev. Accel. Beams, vol. 18, p. 122401 2015.
poster icon Poster TUPA26 [2.090 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-TUPA26  
About • Received ※ 26 July 2022 — Revised ※ 11 August 2022 — Accepted ※ 12 August 2022 — Issue date ※ 21 August 2022
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WEPA78 Proton-Electron Focusing in EIC Ring Electron Cooler electron, proton, emittance, hadron 820
  • S. Seletskiy, A.V. Fedotov, D. Kayran, J. Kewisch
    BNL, Upton, New York, USA
  The Electron Ion Collider (EIC) requires a cooling of protons at the top energy. The Ring Electron Cooler (REC) is a suitable option for such a cooling. In this paper we consider an effect of a proton-electron space charge (SC) focusing on the quality of the electron beam in the REC. We show that, with properly adjusted parameters of the Ring Electron Cooler, the SC focusing in the REC cooling section does not significantly affect the cooler performance.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA78  
About • Received ※ 02 August 2022 — Revised ※ 03 August 2022 — Accepted ※ 09 August 2022 — Issue date ※ 20 August 2022
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THZD3 Design of 3-GeV High-Gradient Booster for Upgraded Proton Radiography at LANSCE booster, proton, linac, quadrupole 891
  • Y.K. Batygin, S.S. Kurennoy
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by US DOE under contract 89233218CNA000001
Increasing the proton beam energy from the present 800 MeV to 3 GeV will improve the resolution of the Proton Radiography Facility at the Los Alamos Neutron Science Center (LANSCE) by a factor of 10. It will bridge the gap between the existing facilities, which covers large length scales for thick objects, and future high-brightness light sources, which can provide the finest resolution. Proton radiography requires a sequence of short beam pulses (~20 x 80 ns) separated by intervals of variable duration, from about 300 ns to 1 to 2 μs. To achieve the required parameters, the high gradient 3-GeV booster is proposed. The booster consists of 1.4 GHz buncher, two accelerators based on 2.8 GHz and 5.6 GHz high-gradient accelerating structures and 1.4 GHz debuncher. Utilization of buncher-accelerator-debuncher scheme allows us to combine high-gradient acceleration with significant reduction of beam momentum spread. Paper discusses details of linac design and expected beam parameters.
slides icon Slides THZD3 [2.348 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-THZD3  
About • Received ※ 28 July 2022 — Revised ※ 06 August 2022 — Accepted ※ 08 August 2022 — Issue date ※ 04 October 2022
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