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Emission Characteristics for <100>, <110> and <111> LaB 6 Cathodes

1980; Institute of Physics; Volume: 19; Issue: 9 Linguagem: Inglês

10.1143/jjap.19.l537

1347-4065

Tadahiro Takigawa, Shintaro Yoshii, Isao Sasaki, Kakuju Motoyama, Takashi Meguro,

Nuclear Physics and Applications

Characteristics for electron beam emitted from <100>, <110> and <111> axial orientation LaB 6 cathodes after 100 hours of aging were studied. It is inferred from the emission pattern and cross-over image that electrons are emitted to a great extent from the top surface for the <100> cathode and mainly from the conical surface for <110> and <111> cathodes at a bias voltage that gives maximum brightness. This inference clearly explains the electron beam characteristics such as brightness, emission angle and total beam current.