  The KATRIN experiment, presently under construction in Karlsruhe, Germany,
will improve on previous laboratory limits on the neutrino mass by a factor of
ten. KATRIN will use a high-activity, gaseous T2 source and a very
high-resolution spectrometer to measure the shape of the high-energy tail of
the tritium-decay beta spectrum. The shape measurement will also be sensitive
to new physics, including sterile neutrinos and Lorentz violation. This report
summarizes recent progress in the experiment.
