AThe tip forming procedure is monitoredby a MCP-detector that can be moved out of the opticalaxis. The electrons start with an emission energy of 1.58 keV for the experiment with He and N2 backgroundgas and 1.44 keV for the one with H2. They coherentlyilluminate a 400 nm wide gold covered biprism fiber thatdivides and combines the electron matter waves [1,9].regime