  The PLS-II has a 100 MeV pre-injector for the 3 GeV Linac. A thermionic gun
produces electron charge of 200 pC with a bunch duration of 500 ps by a 250 ps
triggering pulser. At the pre-injector, one of the most important beam
parameters to identify the beam quality is a transverse emittance of electron
bunches. Therefore we measure the beam emittance and twiss functions at 100 MeV
in order to match the beam optics to beam transport line and go through it to
the storage ring. To get the transverse emittance measurement, well-known
technique, quadrupole scan, is used at the pre-injector. The emittance were
0.591 mm-mrad in horizontal and 0.774 mm-mrad in vertical direction.
