  The Mochi device is a new pulsed power plasma experiment designed to produce
long, collimated, stable, magnetized plasma jets when set up in the LabJet
configuration. The LabJet configuration aims to simulate an astrophysical jet
in the laboratory by mimicking an accretion disk threaded by a poloidal
magnetic field with concentric planar electrodes in front of a solenoidal coil.
The unique setup consists of three electrodes, each with azimuthally symmetric
gas slits. Two of the electrodes are biased independently with respect to the
third electrode to control the radial electric field profile across the
poloidal bias magnetic field. This design approximates a shear azimuthal
rotation profile in an accretion disk. The azimuthally symmetric gas slits
provide a continuously symmetric mass source at the footpoint of the plasma
jet, so any azimuthal rotation of the plasma jet is not hindered by a discrete
number of gas holes. The initial set of diagnostics consists of current
Rogowski coils, voltage probes, magnetic field probe arrays, an interferometer
and ion Doppler spectroscopy, supplemented by a fast ion gauge and a retarding
grid energy analyzer. The measured parameters of the first plasmas are 1E22
m-3, 0.4 T, 5-25 eV, with velocities of 20-80 km/s. The combination of a
controllable electric field profile, a flared poloidal magnetic field, and
azimuthally symmetric mass sources in the experiment successfully produces
short-lived (10 {\mu}s, >5 Alfv\'en times) collimated magnetic jets with ~10:1
aspect-ratio and long-lived (100 {\mu}s, >40 Alfv\'en times) flow-stabilized,
collimated, magnetic jets with ~30:1 aspect-ratio.
