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Sökning: WFRF:(Welsch Carsten)

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1.
  • 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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2.
  • Olvegård, Maja, et al. (författare)
  • Performance of parabolic and diffusive OTR screens at the CLIC Test Facility 3
  • 2011
  • Ingår i: Proceedings of DIPAC2011, Hamburg, Germany. ; , s. 413-415
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • At the CLIC Test Facility 3, OTR screens are commonly used in beam imaging systems for energy and energy spread characterization in dedicated spectrometer lines. In these lines the horizontal beam size is typically of the order of one centimeter. Already in 2005 a limitation was observed resulting from a strong dependence of the intensity of the light captured by the camera, on the positionon the screen (vignetting). The severity of this effect increases with the electron energy, as the aperture of the optical system is finite and the OTR photons are emitted in asmall cone of 1/γ angle. To mitigate this effect, different shapes and surface polishing of the screens were investigated. Parabolic and diffusive OTR radiators were tested in several spectrometer lines all along the CTF3 complex.The results are presented in this paper.
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