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The experimental results of unneutralized electron beam transportation in an evacuated cylindrical metallic drift tube have been obtained. Marx generator is used as a high voltage source to energize the cathode. A 300 keV, 2 kA, and 150 ns pulsed electron beam has been generated by the field emission diode. For axial guidance of the electron beam a 1 Tesla, 260 μs, guide magnetic field has been used. The guide-magnetic field is generated by the discharge of a capacitor bank into a solenoid. A synchronized circuit ensures the triggering of the electron beam at the instant when the axial magnetic field attains its peak value. Experimental studies of the electron beam transportation through various metallic tubes of different wall-materials, and different thicknesses in the presence of varying magnetic fields have been made. Our experimental results show that the transportation properties of the beam get substantially affected because of the different diffusivity of the guide magnetic field through the different materials, and different thicknesses of the wall of the drift tube.
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