Frequency Tuning in a Pasotron Carleen Boyer, John Rodgers, and Dan Lathrop University of Maryland.

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Presentation transcript:

Frequency Tuning in a Pasotron Carleen Boyer, John Rodgers, and Dan Lathrop University of Maryland

Motivation: IEDs and Microwaves? -Microwaves can be used to safely detonate or defeat IEDs HOWEVER Current systems of generating microwaves exhibit two major issues: -Systems are not powerful enough -Frequency output is difficult to control Wikipedia Commons

Experimental Pasotron System -Plasma generated from heating helium gas -Grid creates a voltage potential, accelerating electrons -Electron beam couples with the field of the helix J.C. Rodgers Frequency (GHz) Time (μs) 150 Missing Frequencies!

Tuning the Pasotron Frequency plot of the resonances in the Pasotron -Shows the spectrum of frequencies in the tuned Pasotron Q-factor shows which resonances will be excited in device -Wanted to shift frequency range Frequency (GHz) Frequency (GHz) De-Q these points Q-factor Log(|Z|) (Ohms)

Hot Testing: Low Current Frequency (GHz) Time (μs) UNTUNEDTUNED Relatively low current of around 30 A shows the excitable frequencies of the system

Hot Testing: Mid Current v v v v v Frequency (GHz) Frequency (GHz) Time (μs) UNTUNEDTUNED Mid-range current of around 110 A shows frequency spread in the untuned system, and smaller excited band in the tuned system.

Hot Testing: High Current v Frequency (GHz) Frequency (GHz) v v v v Time (μs) UNTUNEDTUNED High current of around 170 A results in chaotic excitation of the frequencies, and the phenomena of mode hopping.

Conclusions Wanted high spectral density and wide bandwidth Adjusted the cold Q-factors and showed that hot operation was affected by these adjustments Increased spectral density Eliminated mode competition, allowed for mode hopping operation

Acknowledgments -Advisers Dan Lathrop and John Rodgers -Special thanks to Dave Meichle and Freja Nordseik -NSF Award Number PHY Y.R. Bliokh, G.S. Nusinovich, J.C. Rodgers, et al., “Ion noise in the plasma-assisted slow wave osillator”, IEEE Trans. Electronic Devices, vol. 52, pp , G.S. Nusinovich, O.V. Sinitsyn, J.C. Rodgers, A.G. Shkvarunets, Y. Carmel, “Phase locking in backward-wave oscillators with strong end reflections”, Physics of Plasmas, vol. 14, 2007.