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The effect of the iridium nanoparticulate film on heat dissipation capability of the vacuum device has been studied in this letter. In the experimental tests, the copper barrels of the slow-wave structures have been deposited with normal-Ir film and nano-Ir film, respectively. The radiation emissivity coefficients of differential materials have been accurately calculated using the experimental results, and then applied in the computer simulation. The agreement between the experimental results and the simulation results is excellent, suggesting that the iridium nanoparticulate film enables much better heat radiation performance than the normal metal materials.