To perform simulated plasma disruption experiments, a heat source which can provide fast rise and high heat flux on a target surface is required. An existing electron beam facility has been improved to provide higher heat fluxes uniformly over a wider area by installing a high speed beam rastering system. The beam rastering coils can provide a beam oscillation angle of 4.4° with a frequency of up to 400 kHz. The high frequency ensures temporal uniformity of the heat flux on a test surface. Triangular wave shaped current is supplied to excite the coils to provide spatially uniform heat flux over a test surface. Using this electron beam facility, we can provide uniform heat fluxes as high at 160 MW/m2 on an area of 13 mm × 13 mm, and 20 MW/m2 on 38 m × 38 mm.