An electron-cooling device in the one MeV energy region

The project of an electron cooling device at 700 KeV electron kinetic energy will be reported. The single parts of the device will be described in detail. Finally, electron beam diagnostics and technical problems will be discussed

Antiproton stopping power in He in the energy range 1-900 keV and the Barkas effect.

The anti-p stopping power in helium from 1 keV kinetic energy is evaluated. Contrary to the effect observed around and below the maximum, Obelix data indicate a anti-p stopping power higher than that for proton, the difference being of the order of 15\ub15% at 48 700 keV. The result contributes to assert the fundamental difference between anti-p stoppings in the simplest gases (He, H2) and in solid targets below some MeV