Electron Cloud Build-Up Study for DA φ NE

After the first experimental observations compatible with the presence of the e-cloud effect in the DAΦNE positron ring, a more systematic study has been performed regarding the e-cloud build-up. The measured field map of the magnetic field has been taken into account in the simulation for elements present in the four 10 m long bending sections, representing 40% of the whole positron ring. The obtained simulation results are presented together with the recent experimental observations performed on the vacuum behaviour of the positron ring.