Low current performance of the Bern medical cyclotron down to the pA range

M Auger¹, S Braccini¹, A Ereditato¹, K P Nesteruk¹ and P Scampoli^1,2 
1Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland 
²Department of Physics, University of Napoli Federico II, Complesso Universitario di Monte S. Angelo, I-80126, Napoli, Italy