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Suppressing field emission from metallic surfaces is always of high demand for getting the optimum performance of high-voltage vacuum devices. While on the other hand, electron field emission from nanostructures has attracted wide attention in vacuum micro/nano-electronics. This book describes both these aspects. The first part contains the effects of surface preparation and cleaning techniques on Nb and Cu, the effectiveness of dry ice cleaning technique to remove field emitters and interesting results on high purity crystalline Nb samples e.g. onset of FE at high fields (120-200 MV/m),...