  ORKA is a proposed experiment to measure the K+ -> pi+ nu nubar branching
ratio with 5% precision using the Fermilab Main Injector high intensity proton
source. The detector design is based on the BNL E787/E949 experiments, which
detected seven candidate events. Two orders of magnitude improvement in
sensitivity relative to the BNL experiments comes from enhancements to the beam
line and the detector acceptance. Precise measurement of the K+ -> pi+ nu nubar
branching ratio with the same level of uncertainty as the well-understood
Standard Model prediction allows for sensitivity to new physics at and beyond
the LHC mass scale.
