CERN - European Organization for Nuclear Research

Generation of Cold Electrons for an eV Electron Cooler

Trainee: Bruno Galante
Supervisor: Gerard Tranquille

Electron cooling of the antiproton beam will be essential to reduce or eliminate the emittance blow-up caused by the deceleration process and obtain the small emittance antiproton beam needed for further deceleration and extraction to the trap experiments. The electron gun must produce a cold (T^< 0.1 eV, T║ < 1meV) and intense electron beam (ne ≈ 1.5x1012 m-3).
Within this project options for a cold electron source will be studied, including expected performance and limitations and improve the understanding of cold electron beam generation. This will involve simulations into the cooler source performance and experimental studies that aim at a full characterization of the emitted electron beam.

Instrumentation and Detector Beam Line and Test Stand 

Trainee: Mattia Fani
Supervisor: Michael Doser

For the optimization of any detection techniques towards low energy antiproton beams it is essential that detailed tests into the monitor characteristics can be carried out. Recent availability of keV antiprotons at AEgIS has been used to carry out dedicated detector tests which have given important new results. As the experiments mature, however, such opportunities of detector test disappear, while the need for a very low energy antiproton instrumentation test facility remains high. Within this project a dedicated diagnostics and detector test stand at the AD will designed, built and established to carry out investigations using different sensors over a wide range of beam energies and intensities. A key aspect is that the setup needs to also contain the strong solenoidal magnets which are characteristic of all antiproton trapping devices. Consequently, multiple scattering in the degrading elements will result in very large beam divergence. In combination between simulations and technical design considerations the optimum geometry will be evaluated and whether e.g. a low momentum (weak field) magnetic filter would be beneficial. Space limitations, vacuum requirements, and tuneability of the degrader thickness will be studied, which shall make the setup a polyvalent facility with great benefit in evaluating the performance of beam instrumentation for any low-energy antiproton facility.