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18 Jan 1999

Volume 74, Issue 3, pp. 329-478

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Demonstration of microwave generation by a ferroelectric-cathode tube

R. Drori, M. Einat, D. Shur, E. Jerby, G. Rosenman, R. Advani, R. J. Temkin, and C. Pralong

Appl. Phys. Lett. 74, 335 (1999); http://dx.doi.org/10.1063/1.123063 (3 pages) | Cited 16 times

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A ferroelectric cathode is employed in a cyclotron-resonance maser (CRM). The CRM oscillator device operates at ∼ 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 (ϵr ∼ 4000). Electrons are extracted from the plasma excited on the cathode surface by ∼ 1 kV short rise-time pulses. The use of ferroelectric cathodes may advance the microwave tube technology for various applications. © 1999 American Institute of Physics.
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84.40.Ik Masers; gyrotrons (cyclotron-resonance masers)
84.30.Ng Oscillators, pulse generators, and function generators
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
07.57.Hm Infrared, submillimeter wave, microwave, and radiowave sources
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates

Tailoring of electron energy distributions in low-pressure inductive discharges

F. A. Haas and N. St. J. Braithwaite

Appl. Phys. Lett. 74, 338 (1999); http://dx.doi.org/10.1063/1.123064 (3 pages) | Cited 5 times

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Assuming a background Maxwellian electron distribution, the effects of adding an energetic tail upon the electron temperature and density in an inductive low-pressure argon discharge are investigated theoretically. The principal effect of the tail is to modify the rate constants for ionization, excitation, and momentum transfer. Using particle and energy conservation, the possibility of suppressing the electron temperature and increasing the electron density is demonstrated. It is found that under typical conditions of operation the electron temperature can be decreased from 2.5 to 1.5 eV, and the electron density increased by at least a factor of 2.4. © 1999 American Institute of Physics.
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52.80.-s Electric discharges
52.25.Kn Thermodynamics of plasmas
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