  Space-charge effects belong to the category of the most long-standing issues
in beam physics, and even today, after several decades of very active
exploration and development of counter-measures, they still pose the most
profound limitations on performance of high intensity proton accelerators. We
briefly consider past experience in active compensation of these effects and
present in detail the progress towards experimental studies of novel schemes of
space-charge compensation at the Fermilab's IOTA ring.
