  Three types of high rate neutrino detectors for neutrino interaction physics
at neutrino factories are discussed. High performance general-purpose detectors
might collect event samples on the order of a billion events or more. This
could greatly improve on existing analyses of neutrino interactions and also
lead to new and important analysis topics including, for example, precise
determinations of the CKM matrix elements |Vub| and |Vcb|. The potential of
such general purpose detectors is illustrated with reference to a detector,
presented previously in reference hep-ex/9907033, that is structured around a
novel and compact vertexing and tracking neutrino target comprising a stack of
CCD pixel devices. Design ideas and prospects are also discussed for two types
of specialized detectors: (i) polarized targets filled with polarized solid
protium-deuterium (HD), for unique and powerful studies of the nucleon's spin
structure, and (ii) Fully active liquid tracking targets with masses of several
tonnes for precise determinations of the weak mixing angle, from the total
cross-section for neutrino-electron scattering. All three detector types pose
severe technical challenges but their utilization could add significantly to
the physics motivation for neutrino factories.
