Drori, R.Einat, M.Shur, D.Jerby, E.Rosenman, G.Advani, R.Temkin, R. J.Pralong, C.2008-04-162008-04-162008-04-16199910.1063/1.123063https://infoscience.epfl.ch/handle/20.500.14299/21595A ferroelectric cathode is employed in a cyclotron-resonance maser (CRM). The CRM oscillator device operates at similar to 7 GHz, near the cutoff frequency of a hollow cylindrical cavity. The cathode is made of a PLZT 12/65/35 ceramic with high-dielectric constant (epsilon(r)similar to 4000). Electrons are extracted from the plasma excited on the cathode surface by similar to 1 kV short rise-time pulses. The use of ferroelectric cathodes may advance the microwave tube technology for various applications. (C) 1999 American Institute of Physics. [S0003-6951(99)03403-8].text::journal::journal article::research article