Numerical simulation of high-power virtual-cathode reflex triode driven by repetitive short pulse electron gun

Journal Article · Sat Jun 01 00:00:00 EDT 1996 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/27.533108· OSTI ID:377864

Yovchev, I G; Spassovsky, I P; Nikolov, N A; Dimitrov, D P ^[1]; Messina, G ^[2]; Raimondi, P ^[3]; Barroso, J J; Correa, R A ^[4]

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1. Sofia Univ. (Bulgaria). Faculty of Physics
2. ENEA, Rome (Italy)
3. Stanford Linear Accelerator Center, CA (United States)
4. INPE, Sao Jose dos Campos, Sao Paulo (Brazil)

A virtual-cathode reflex triode is investigated by numerical simulations. A trapezoidal in shape voltage pulse with an amplitude of 300 kV is applied to the solid cathode of the device to drive the cathode negative. The electron beam-to-microwave power conversion efficiency {epsilon}, calculated for the pulse flat top with a duration {tau}{sub ft} = 1.2 ns is approximately the same (about 1.5--2%) as well as for a long flat top ({tau}{sub ft} = 4 ns). The simulations show a 10--15% increase of {epsilon} at {tau}{sub ft} shortening to 0.6 ns. However, this occurs when the anode mesh transparency is high (80--90%). Considerable enhancement of the efficiency (about four times) for {tau}{sub ft} = 0.6 ns has been calculated if the cathode side surface is brought near to the anode tube (from {approx}0.5% at cathode radius R{sub c} = 1.6 cm to {approx}2% at R{sub c} = 3.8 cm). The obtained results would find an application for the design of virtual-cathode reflex triode devices driven by a short pulse and high repetition rate electron gun.

• OSTI ID: 377864
• Journal Information: IEEE Transactions on Plasma Science, Vol. 24, Issue 3; Other Information: PBD: Jun 1996
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
TRIODE TUBES
NUMERICAL ANALYSIS
COMPUTERIZED SIMULATION
ELECTRIC POTENTIAL
ELECTRODES
PERFORMANCE
MICROWAVE TUBES
THEORETICAL DATA