  We present the design, fabrication, and low power testing of a THz-driven
field emission electron gun. The two cell standing-wave gun is designed to be
powered by a 110 GHz gyrotron and produce 360 keV electrons with 500 kW of
input power. Several gun structures were fabricated using a high precision
diamond turned mandrel and copper electroforming. The field emission source is
a copper tip with a 50 $\mu$m radius inserted halfway into first cell. The
frequencies of the cavity resonances were mechanically tuned using azimuthal
compression. This work presents electromagnetic and particle simulations of the
design and cold test measurements of the fabricated structures.
