  ORKA is a proposed experiment to measure the K+ -> pi+nunubar 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 K+ -> pi+nunubar candidate events. ORKA is expected to acheive
two orders of magnitude improvement in sensitivity relative to the BNL
experiments as a result of enhancements to the beam line and the detector
acceptance. Precise measurement of the K+ -> pi+nunubar 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.
Detector R&D, simulation-based optimization of the experiment design, and
preparation of the experiment location are underway.
