P Lefevre

Measurement of the lifetime of Pb52+, Pb53+ and Pb54+ beams at 4.2 MeV per nucleon subject to electron cooling

Abstract By measuring the lifetime of stored beams, the recombination of the ions with cooling electrons was investigated. Rates found are larger than expected for radiative electron capture and significantly higher for Pb53+ than for Pb54+ and Pb52+. These results are important for the design of the lead ion injection system for the Large Hadron Collider and for recombination theories.

SuperLEAR, conceptual machine design

Abstract Following the Workshop on “Physics at SuperLEAR”, which was held in Zurich in October, 1991, a conceptual design was worked out for a 3.5–12 GeV/c antiproton cooling ring optimised for operation with an internal target and an extracted beam. This paper summarises the main features and discusses the expected performances.

Measurements of H− intra-beam stripping cross section by observing a stored beam in lear

Abstract The cross section for H − “intra-beam stripping”: H − + H − → H − + H 0 + e − was measured by analysing the decay of a stored H − beam. Results ( σ max = 3.6 × 10 −15 cm 2 ± 30%) agree with recently published classical trajectory Monte Carlo calculations but suggest a smaller cross section than obtained from earlier theoretical models. This sets more favourable conditions for the storage of H − beams than previously assumed.

Production of MeV antiprotons

In view of a future antihydrogen programme at CERN, the options for producing MeV antiprotons are revisited. The current limitations, operational performances and foreseen improvements are detailed. An alternative scheme using a dedicated machine for production and deceleration is also discussed.

Ultralow momentum anti-protons in LEAR

Abstract Limitations to the antiproton beam intensities that are decelerated and stored in LEAR are examined, and expectations for machine performance in the momentum range at and below 105 MeV/c are given. These estimates are compared with the current machine performance. The various modes of beam extraction at low momentum are reviewed and some estimations are given for fast extraction efficiencies.

Ultra-low momentum antiprotons in LEAR

Abstract Limitations to the antiproton beam intensities that are decelerated and stored in LEAR are examined, and expectations for machine performance in the momentum range at and below 105 MeV/c are given. These estimates are compared with the current machine performance. The various modes of beam extraction at low momentum are reviewed and some estimations are given for fast extraction efficiencies.

Slear, A High Luminosity 10 Gev Proton-Antiproton Storage Ring with Superconducting Magnets

The design of a 10 GeV antiproton storage- and cooling ring (SLEAR) desired for precision studies with internal targets and \(\bar p\)p colliding beams is revisited. Possible geometries of a compact, high luminosity machine with superconducting magnets are discussed. Apart from being a powerful tool for particle physics, SLEAR could be an attractive “testbed” of new accelerator technology. Complementary possibilities for a \(\bar b\)b “pre-experiment” at CERN are mentioned.