Brightness Measurements Of Electron Beams Photoemitted From Multicrystalline LaB[sub]6[/sub] And The Effects Of Environmental Pressure

Peter E. Oettinger

doi:10.1117/12.951824

25 July 1989 Brightness Measurements Of Electron Beams Photoemitted From Multicrystalline LaB₆ And The Effects Of Environmental Pressure

Peter E. Oettinger

Author Affiliations +

Proceedings Volume 1061, Microwave and Particle Beam Sources and Directed Energy Concepts; (1989) https://doi.org/10.1117/12.951824
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Lanthanum hexaboride has been tested as a photoemitter when irradiated by unpolarized UV lasers. For photon energies of 5 eV or less, the material, in a multicrystalline form, is measured to have a quantum efficiency at least an order of magnitude greater than that of simple metals. Maximum currents, from a 1.27 cm2 sample, limited by the available laser power, were recorded to be 52, 36, and 0.9 A at irradiating wavelengths of 193, 248, and 308 nm, respectively. At 193 and 248 nm the corresponding normalized rms brightnesses were 6.7 x 106 and 2.6 x 106 A/cm2-rad2. The results appear insensitive to chamber pressure in, at least, the range of 10-5 to 10-8 toff.

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Peter E. Oettinger "Brightness Measurements Of Electron Beams Photoemitted From Multicrystalline LaB₆ And The Effects Of Environmental Pressure", Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989); https://doi.org/10.1117/12.951824

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