  Increasing the Fermilab Main Injector (MI) beam power above ~1.2 MW requires
replacement of the 8 GeV Booster by a higher intensity alternative. Earlier,
rapid-cycling synchrotron and linac solutions were considered for this purpose.
In this paper, we consider the linac version that produces 8 GeV H- beam for
injection into the Recycler Ring (RR) or MI The new linac takes ~1 GeV beam
from the PIP-II linac and accelerates it to ~ 2 GeV in a 650 MHz SRF linac, and
then accelerates to ~8 GeV in an SRF pulsed linac using 1300 MHz cryomodules.
The linac components incorporate recent improvements in SRF technology. This
Booster Replacement linac (BRL) will increase MI beam power to DUNE to more
than 2.5 MW and enable next-generation intensity frontier experiments.
