Author: Newton, D.
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MOPRO036 Beam Life Time and Stability Studies for ELENA 154
 
  • J. Resta-López, O. Karamyshev, D. Newton, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • O. Karamyshev, D. Newton, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • J. Resta-López
    IFIC, Valencia, Spain
 
  Funding: Work supported by the EU under Grant Agreement 624854 and the STFC Cockcroft Institute Core Grant No. ST/G008248/1.
The Extremely Low ENergy Antiproton ring (ELENA) is a small synchrotron equipped with an electron cooler, which shall be constructed at CERN to decelerate antiprotons to energies as low as 100 keV. At such low energies it is very important to carefully take contributions from electron cooling and heating effects (e.g. on the residual gas) into account. Detailed investigations into the ion kinetics under consideration of effects from electron cooling and scattering on the residual gas have been carried out using the BETACOOL code. In this contribution a consistent explanation of the different physical effects acting on the beam in ELENA is given. Beam lifetime, equilibrium momentum spread and emittance are all estimated based on numerical simulations. Finally, optimum machine settings are presented as a result of optimization studies.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO036  
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MOPRI006 Possible Uses of Gamma-rays at Future Intense Positron Sources 586
SUSPSNE024   use link to see paper's listing under its alternate paper code  
 
  • A.O. Alrashdi, I.R. Bailey
    Lancaster University, Lancaster, United Kingdom
  • A.O. Alrashdi, I.R. Bailey, D. Newton
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A.O. Alrashdi
    KACST, Riyadh, Kingdom of Saudi Arabia
  • D. Newton
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: This research is funded in part by STFC grant ST/G008248/1
The baseline design of the ILC (International Linear Collider) positron source requires the production of an intense flux of gamma rays. In this paper we present an investigation of using the gamma ray beam of the ILC for additional applications, including nuclear physics. As a result of changing the collimator shape, as well as the parameters of the undulator magnets, we obtained spectra from numerical simulations using the HUSR/GSR software package. We present results from simulations and a discussion of possible future investigations in this paper.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI006  
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TUPRO025 Initial Estimate of Fringe Field Effects in HL-LHC using Frequency Map Analysis 1067
SUSPSNE002   use link to see paper's listing under its alternate paper code  
 
  • S. Jones, D. Newton, A. Wolski
    The University of Liverpool, Liverpool, United Kingdom
  • S. Jones, D. Newton, A. Wolski
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Funding: Work supported by the Science and Technology Facilities Council, UK
The planned High Luminosity upgrade to the LHC will require stronger focusing of the beam in the interaction regions. To achieve this, the inner triplet quadrupoles will be replaced with new magnets having larger gradient and aperture. In this new focusing regime the quadrupole fringe fields are expected to have a greater effect on the beam dynamics, due to their large aperture, as compared to the nominal LHC. In this preliminary study, simplified models are used in a tracking code to assess the impact of the fringe fields on the dynamics using frequency map analysis.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO025  
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TUPRO070 LHeC IR Optics Design Integrated into the HL-LHC Lattice 1198
SUSPSNE049   use link to see paper's listing under its alternate paper code  
 
  • E. Cruz Alaniz, M. Korostelev, D. Newton
    The University of Liverpool, Liverpool, United Kingdom
  • E. Cruz Alaniz, M. Korostelev, D. Newton
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • R. Tomás
    CERN, Geneva, Switzerland
 
  Funding: OPAC fellowship funded by European Union under contract PITN-GA-2011-289485
The LHeC is a proposed upgrade to the LHC to provide electron-proton collisions and explore the new regime of energy and intensity for lepton-nucleon scattering. The work presented here investigates optics and layout solutions allowing simultaneous nucleon-nucleon and lepton-nucleon collisions at separate interaction points compatible with the proposed HL-LHC lattice. A first lattice design has been proposed that collides proton beam 2 with the electron beam. The nominal design calls for a β* (beta function in the interaction point ) of 10 cm using an extended version of the Achromatic Telescopic Squeezing (ATS) scheme, and a L* (distance to the inner triplet) of 10 m. Modifying these two parameters, β* and L*, can provide benefits to the current design since the values of these parameters have direct effects on the luminosity, the natural chromaticity and the synchrotron radiation of the electron beam. This work aims to explore the range over which these parameters can be varied in order to achieve the desired goal.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO070  
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TUPRO071 Optimization of Low Energy Electrostatic Beam Lines 1202
 
  • O. Karamyshev, D. Newton, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • O. Karamyshev, D. Newton, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: Work supported by the STFC Cockcroft Institute Core Grant No. ST/G008248/1
Electrostatic elements are frequently used for transporting low energy charged particles, as they are easy to build and operate. However, beam motion is strongly affected by effects from fringe fields, positioning and manufacturing errors of individual ion optical elements. It is important to carry out detailed studies into these effects in order to optimize beam transport. In this paper results from numerical studies with a purpose-written code are presented and compared against analytical estimates. It is shown how the results can be used to optimize the mechanical layout of the electrostatic ion optics elements, including quadrupoles and spherical deflectors. Finally, the results from beam tracking through a multi-element beam line are presented on the basis of both, matrix multiplication and numerical particle tracking.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO071  
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