It has
recently been proposed to use a dispersionless translating section (dogleg)
with sextupole correction magnets as a bunch compressor to create longitudinally
shaped (linearly ramped) electron bunches. We discuss the experiment
soon to be underway at the UCLA Neptune Linear Accelerator Laboratory
to test this technique with the 300 pC, 13 MeV electron bunches produced
by the Neptune S-Band photoinjector. The experiment will utilize a dipole-mode
deflecting cavity, as a temporal diagnostic, and a final focus system
of permanent magnet quadrupoles with field gradients of 110 T/m. We
also discuss the potential scaling of this technique to bunches of high
(i.e. > 1nC) charge for the purpose of creating a suitable drive
beam for the plasma wakefield accelerator, operating in the blowout
regime.