Possibilities of cooling the extracted antiproton LEAR beams

A novel phase space compression technique has been recently considered for improving the quality of secondary beams of short lived particles. The principle is to treat separately each single particle in the beam. Thin particle detectors are used for measuring the phase space position of the particle and pulsed electromagnetic fields for displacing this phase space position towards a predetermined phase space point. We consider here the application of the method to improvement of the extracted antiproton beams at LEAR. By using adequate detector configurations, transverse phase space compression by a factor exceeding 106 can be achieved over the whole LEAR momentum range. Application to the 100 MeV/c beam, which will soon be available, is described. It is also shown how reducing the momentum resolution of the beam down to 10-4 can be achieved. The method is particularly useful in connection with the production of ultra low energy antip beams. At 200 keV antip beam energy, phase space parameters of Σ < 0.04 π mm mrad and Δp/p < 10-4 should be achievable. Such antiprotons can be further decelerated to obtain high quality antip beams in the eV range for atomic physics experiments