Measurement of extent of intense ion beam charge neutralization

Various diagnostic tools were employed to study and to optimize the extent of. space charge neutralization in the pulsed intense proton beam facility PROF A. (see papers to this conference [1,2]), comprising Langmuir probes, capacitive probes and a novel type of three electrode collector. The latter does not only allow to measure ion and electron beam current densities in a high magn. field environment, but also to deduce the density spectrum of the beam. electrons. Appropriate operating conditions were identified to attain complete space charge neutralisation.