Physical Review Special Topics. Accelerators and Beams (Feb 2015)

Toward polarized antiprotons: Machine development for spin-filtering experiments

  • C. Weidemann,
  • F. Rathmann,
  • H. J. Stein,
  • B. Lorentz,
  • Z. Bagdasarian,
  • L. Barion,
  • S. Barsov,
  • U. Bechstedt,
  • S. Bertelli,
  • D. Chiladze,
  • G. Ciullo,
  • M. Contalbrigo,
  • S. Dymov,
  • R. Engels,
  • M. Gaisser,
  • R. Gebel,
  • P. Goslawski,
  • K. Grigoriev,
  • G. Guidoboni,
  • A. Kacharava,
  • V. Kamerdzhiev,
  • A. Khoukaz,
  • A. Kulikov,
  • A. Lehrach,
  • P. Lenisa,
  • N. Lomidze,
  • G. Macharashvili,
  • R. Maier,
  • S. Martin,
  • D. Mchedlishvili,
  • H. O. Meyer,
  • S. Merzliakov,
  • M. Mielke,
  • M. Mikirtychiants,
  • S. Mikirtychiants,
  • A. Nass,
  • N. N. Nikolaev,
  • D. Oellers,
  • M. Papenbrock,
  • A. Pesce,
  • D. Prasuhn,
  • M. Retzlaff,
  • R. Schleichert,
  • D. Schröer,
  • H. Seyfarth,
  • H. Soltner,
  • M. Statera,
  • E. Steffens,
  • H. Stockhorst,
  • H. Ströher,
  • M. Tabidze,
  • G. Tagliente,
  • P. Thörngren Engblom,
  • S. Trusov,
  • Yu. Valdau,
  • A. Vasiliev,
  • P. Wüstner

DOI
https://doi.org/10.1103/PhysRevSTAB.18.020101
Journal volume & issue
Vol. 18, no. 2
p. 020101

Abstract

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The paper describes the commissioning of the experimental equipment and the machine studies required for the first spin-filtering experiment with protons at a beam kinetic energy of 49.3 MeV in COSY. The implementation of a low-β insertion made it possible to achieve beam lifetimes of τ_{b}=8000 s in the presence of a dense polarized hydrogen storage-cell target of areal density d_{t}=(5.5±0.2)×10^{13} atoms/cm^{2}. The developed techniques can be directly applied to antiproton machines and allow the determination of the spin-dependent p[over ¯]p cross sections via spin filtering.