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Laser Undulator Compact X-ray source (LUCX) is a test bench for compact high brightness X-ray generator at KEK, which is based on the Compton Scattering. For the project, one of the challenged problems is to generate and to accelerate high charge and low emittance, multi-bunch electron beams. In this paper, we analyze the contribution on the beam transverse emittance from the electron beam transverse distribution in the gun, comparing the uniform electron beam with the Gaussian beam. The working principle of laser profile shaper– π-shaper is introduced. We redesign the laser beam line for the shaper and convert the Gaussian laser beam into semi uniform laser beam successfully. With the uniform laser pulse, the transverse emittance for the 1nC electron bunch decreases from 5.46πmm.mrad (Gaussian laser) to 3.66πmm.mrad.
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