Abstract
We present experimental studies of a plasma-filled X-band backward wave oscillator (BWO). Depending on the background gas pressure, microwave frequency upshifts of up to 1 GHz appeared along with an enhancement of a factor of 7 in the total microwave power emission. The bandwidth of the microwave emission increased from ≤0.5 to 2 GHz when the BWO was working at the rf power enhancement pressure region. The rf power enhancement appeared over a much wider pressure range in a high beam current case (10–100 mT for 3 kA) as compared to a lower beam case (80–115 mT for 1.6 kA). The plasma-filled BWO has higher power output compared to the vacuum BWO over a broader region of magnetic guide field strength.
Highlights
We present experimental studies of a plasma-filled X-band backward wave oscillator (BWO)
The bandwidth of ·the microwave emission increased from
In a recent theoretical description of the plasma-filled BW03 it was shown that the addition of plasma results in a frequency upshift in the output of the BWO, the amount ofshift depending on the plasma density, nP
Summary
We present experimental studies of a plasma-filled X-band backward wave oscillator (BWO). Depending on the background gas pressure, microwave frequency upshifts of up to 1 GHz appeared along with an enhancement ofa factor of 7 in the total microwave power emission. The bandwidth of ·the microwave emission increased from
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