  Integrable optics is an innovation in particle accelerator design that
potentially enables a greater betatron tune spread and damps collective
instabilities. An integrable rapid-cycling synchrotron (RCS) would be an
effective replacement for the Fermilab Booster, as part of a plan to reach
multi-MW beam power at 120 GeV for the Fermilab high-energy neutrino program.
We provide an example integrable lattice with features of a modern RCS -
dispersion-free drifts, low momentum compaction factor, superperiodicity,
chromaticity correction, bounded beta functions, and separate-function magnets.
