Energy Calibration of Underground Neutrino Detectors using a 100 MeV electron accelerator

An electron accelerator in the 100 MeV range, similar to the one used at BNLs Accelerator test Facility, for example, would have some advantages as a calibration tool for water cerenkov or Liquid Argon neutrino detectors. We describe a compact secondary beam design that could be used for this application.