Fig. 1. Experimental layout

Fig. 2. Electron beam image on IP board. W wire target with d=0.03 mm，L=150 mm

Fig. 3. Electron beam profiles on two-layer IP board for three wires

Fig. 4. Electron spatial distribution on three-layer IP board for tungsten wire of different length

Fig. 5. Beamlet and energy spectrum

Fig. 6. E field in the 2-cell RF cavity

Fig. 7. Initial distribution of electron bunch

Fig. 8. Bunch length vs injection phase

Fig. 9. Average beam energy in the RF cavity and bunch length (RMS) in the cavity