  From 2005 through 2012, the Fermilab Main Injector provided intense beams of
120 GeV protons to produce neutrino beams and antiprotons. Hardware
improvements in conjunction with improved diagnostics allowed the system to
reach sustained operation at 400 kW beam power. Losses were at or near the 8
GeV injection energy where 95% beam transmission results in about 1.5 kW of
beam loss. By minimizing and localizing loss, residual radiation levels fell
while beam power was doubled. Lost beam was directed to either the collimation
system or to the beam abort. Critical apertures were increased while improved
instrumentation allowed optimal use of available apertures. We will summarize
the impact of various loss control tools and the status and trends in residual
radiation in the Main Injector.
