  Using a particle-in-cell (PIC) code, we investigated the possibilities for
emittance growth through the quadrupole magnets of the system used to transport
the high-current electron beam from an induction accelerator to the
bremsstrahlung converter target used for flash radiography. We found that even
highly mismatched beams exhibited little emittance growth (< 6%), which we
attribute to softening of their initial hard edge current distributions. We
also used this PIC code to evaluate the accuracy of emittance measurements
using a solenoid focal scan following the quadrupole magnets. If the beam is
round after the solenoids, the simulations indicate that the measurement is
highly accurate, but it is substantially inaccurate for elliptical beams.
