  The results of an extensive operation of a Vacuum Spark plasma using Titanium
electrodes in a 120 ns 150 kA discharge are presented. The hot spots are found
to form with a regular spacing in a zippering Z-pinch plasma, which forms close
to the cathode and extends to approximately two thirds of the anode separation
over a period of a few ns. The axis of the discharge is well defined by an
initial plasma from a Nd:YAG laser focussed onto the cathode electrode surface.
The statistics of the formation of the hot spots are given for the life of one
anode electrode. Between one and three hotspots form and the favored positions
are at 1.5 and 3.0 mm from the cathode and the strongest emission, as observed
in a filtered X-ray pinhole camera, comes from the hot spot closest to the
cathode. The emission spectra resolved between 50 and 350 \AA shows a wide
range of Ti ionization which allows the temperatures of the anode blow off
plasma, the Z-pinch and the hot spot plasma to be distinguished. These results
are compared with filtered PIN diode signals and filtered pinhole images.
