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Träfflista för sökning "WFRF:(Gessner Oliver) srt2:(2020-2022)"

Sökning: WFRF:(Gessner Oliver) > (2020-2022)

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1.
  • Feinberg, Alexandra J., et al. (författare)
  • X-ray diffractive imaging of highly ionized helium nanodroplets
  • 2022
  • Ingår i: Physical Review Research. - 2643-1564. ; 4:2
  • Tidskriftsartikel (refereegranskat)abstract
    • Finding the lowest energy configuration of N unit charges on a sphere, known as Thomson's problem, is a long-standing query which has only been studied via numerical simulations. We present its physical realization using multiply charged He nanodroplets. The charge positions are determined by x-ray coherent diffractive imaging with Xe as a contrast agent. In neutral droplets, filaments resulting from Xe atoms condensing on quantum vortices are observed. Unique to charged droplets, however, Xe clusters that condense on charges are distributed on the surface in lattice-like structures, introducing He droplets as experimental model systems for the study of Thomson's problem.
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2.
  • Gschwendtner, Dda, et al. (författare)
  • The AWAKE Run 2 Programme and Beyond
  • 2022
  • Ingår i: Symmetry. - : MDPI AG. - 2073-8994. ; 14:8
  • Tidskriftsartikel (refereegranskat)abstract
    • Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. The use of high energy protons to drive wakefields in plasma has been demonstrated during Run 1 of the AWAKE programme at CERN. Protons of energy 400 GeV drove wakefields that accelerated electrons to 2 GeV in under 10 m of plasma. The AWAKE collaboration is now embarking on Run 2 with the main aims to demonstrate stable accelerating gradients of 0.5-1 GV/m, preserve emittance of the electron bunches during acceleration and develop plasma sources scalable to 100s of metres and beyond. By the end of Run 2, the AWAKE scheme should be able to provide electron beams for particle physics experiments and several possible experiments have already been evaluated. This article summarises the programme of AWAKE Run 2 and how it will be achieved as well as the possible application of the AWAKE scheme to novel particle physics experiments.
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