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Sökning: WFRF:(Molloy Stephen)

  • Resultat 1-4 av 4
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1.
  • Weisend, John, et al. (författare)
  • Status of the ESS Cryogenic System
  • 2014
  • Ingår i: Advances in Cryogenic Engineering: Transactions of the Cryogenic Engineering Conference - CEC (AIP Conference Proceedings). - : AIP Publishing LLC. - 0094-243X .- 1551-7616. ; 1573, s. 633-638
  • Konferensbidrag (refereegranskat)abstract
    • The European Spallation Source (ESS) is a neutron science facility funded by a collaboration of 17 European countries currently under design and construction in Lund, Sweden. The centerpiece of ESS is a 2.5 GeV proton linac utilizing superconducting RF cavities operating at 2 K. In addition to cooling the SRF cavities, cryogenics is also used at ESS in the liquid hydrogen moderators surrounding the target. ESS also uses both liquid helium and liquid nitrogen in a number of the planned neutron instruments. There is also a significant cryogenic installation associated with the site acceptance testing of the ESS cryomodules. The ESS cryogenic system consists of 3 separate helium refrigeration/liquefaction plants supplying the accelerator, target moderators and instruments. An extensive cryogenic distribution system connects the accelerator cryoplant with the cryomodules. This paper describes the preliminary design of the ESS cryogenic system including the expected heat loads. Challenges associated with the required high reliability and turn-down capability will also be discussed. A unique feature of ESS is its commitment to sustainability and energy recovery. A conceptual design for recovering waste heat from the helium compressors for use in the Lund district heating system will also be described.
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2.
  • Ainsworth, Robert, et al. (författare)
  • The influence of parasitic modes on beam dynamics for the European spallation source linac
  • 2014
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 734, s. 95-100
  • Tidskriftsartikel (refereegranskat)abstract
    • The European Spallation Source (ESS) linac will consist of three families of superconducting RE cavities to accelerate protons to a final beam energy of 2.5 GeV for collision with the target. Beam induced HOMs in these cavities may drive the beam unstable and increase the cryogenic load, severely limiting the operation of the linac. The effect of these modes on the beam quality is investigated in detail using a numerical code dedicated to beam-HOM interaction. (C) 2012 Elsevier B.V. All rights reserved.
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4.
  • Meirose, Bernhard, et al. (författare)
  • Real-time accelerator diagnostic tools for the max iv storage rings
  • 2020
  • Ingår i: Instruments. - : MDPI AG. - 2410-390X. ; 4:3
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, beam diagnostic and monitoring tools developed by the MAX IV Operations Group are discussed. In particular, beam position monitoring and accelerator tunes visualization software tools, as well as tools that directly influence the beam quality and stability, are introduced. An availability and downtime monitoring application is also presented.
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  • Resultat 1-4 av 4

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