Author: Sievers, P.
Paper Title Page
WEPOPT054 Target Studies for the FCC-ee Positron Source 1979
 
  • F. Alharthi, I. Chaikovska, R. Chehab, S. Ogur, A. Ushakov, S. Wallon
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • L. Bandiera, A. Mazzolari, M. Romagnoni, A.I. Sytov
    INFN-Ferrara, Ferrara, Italy
  • J. Diefenbach, W. Lauth
    IKP, Mainz, Germany
  • O. Khomyshyn
    Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
  • D.M. Klekots
    National Taras Shevchenko University of Kyiv, The Faculty of Physics, Kyiv, Ukraine
  • V.V. Mytrochenko
    NSC/KIPT, Kharkov, Ukraine
  • P. Sievers, Y. Zhao
    CERN, Meyrin, Switzerland
  • M. Soldani
    Università degli Studi di Ferrara, Ferrara, Italy
 
  FCC-ee injector study foresees 3.5~nC electron and positron bunches with 200 Hz repetition and 2 bunches per linac pulse at 6~GeV extraction energy. Regarding the possible options of positron production, we retain both of the conventional amorphous target and the hybrid target options. The hybrid scheme uses an intense photon production by 6 GeV electrons impinging on a crystal oriented along a lattice axis. In such a way, it involves two targets: a crystal as a photon radiator and an amorphous target-converter. Therefore, to avoid early failure or damage of the target, the candidate materials for the crystal and conversion targets have started to be tested by using the intense electron beam at Mainzer Mikrotron in Germany by the end of 2021. By manipulating the beam intensity, focusing, and chopping, a Peak Energy Deposition Density in the tested targets could be achieved close to that generated by the electron/photon beam in the FCC-ee positron target. Radiation-damage studies of the crystal sample have been also performed allowing estimating the effect on the photon enhancement used in the hybrid positron source.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOPT054  
About • Received ※ 16 June 2022 — Revised ※ 16 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 21 June 2022
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