An experimental setup to demonstrate a recent scheme [Leopold et al., Phys. Plasmas 24, 073116 (2017)] to persistently over-inject a vacuum electron diode so that it self-oscillates in the GHz-frequency range and releases a periodic train of electron bunches is described. We present simulations in which we account for the finite rise time of the voltage accelerating electrons from a finite radius cylindrical thermionic cathode and finite grid electrode transparency, which make the experiment different from the original theoretical scheme. It was found that these experimental conditions do affect the expected results but a self-oscillating behavior is still possible. Our experimental results so far indicate the presence of the self-oscillatory behavior, but because the cathode used emits from a few hot-spots rather than uniformly, the beam current modulations are different from those obtained in the simulations.
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March 2019
Research Article|
March 19 2019
Self-oscillations in an over-injected electron diode – Experiment and analysis Available to Purchase
M. Siman-Tov;
M. Siman-Tov
Physics Department, Technion, Israel Institute of Technology
, Haifa 3200003, Israel
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J. G. Leopold;
J. G. Leopold
Physics Department, Technion, Israel Institute of Technology
, Haifa 3200003, Israel
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Ya. E. Krasik
Ya. E. Krasik
Physics Department, Technion, Israel Institute of Technology
, Haifa 3200003, Israel
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Physics Department, Technion, Israel Institute of Technology
, Haifa 3200003, Israel
Phys. Plasmas 26, 033113 (2019)
Article history
Received:
January 03 2019
Accepted:
February 26 2019
Citation
M. Siman-Tov, J. G. Leopold, Ya. E. Krasik; Self-oscillations in an over-injected electron diode – Experiment and analysis. Phys. Plasmas 1 March 2019; 26 (3): 033113. https://doi.org/10.1063/1.5087708
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