  Within the framework of the LHC Injector Upgrade (LIU), the new LINAC4 is
currently being commissioned to replace the existing LINAC2 proton source at
CERN. After the expected completion at the end of 2016, the LINAC4 will
accelerate H- ions to 160 MeV. To measure the transverse emittance of the H-
beam, a method based on photo-detachment is proposed. This system will operate
using a pulsed laser with light delivered via an optical fibre and subsequently
focused through a thin slice of the H- beam. The laser photons have sufficient
energy to detach the outer electron and create H0/e- pairs. In a downstream
dipole, the created H0 particles are separated from the unstripped H- ions and
their distribution is measured with a dedicated detector. By scanning the
focused laser across the H- beam, the transverse emittance of the H- beam can
be reconstructed. This paper will first discuss the concept, design and
simulations of the laser
