Figure 2: RF diode signal waveforms attenuated due to plasma formation in the path of the RF beam. | Nature Communications

Figure 2: RF diode signal waveforms attenuated due to plasma formation in the path of the RF beam.

From: Remote detection of radioactive material using high-power pulsed electromagnetic radiation

Figure 2

Typically, the radio-frequency (RF) pulse is turned on at around 15 μs and maintained for 20 μs, as indicated by the black curve, which was obtained without a source. The RF pulses drop quickly because they are attenuated immediately upon plasma formation. The RF signals do not completely drop to zero in air at 60 Torr or 760 Torr or in Ar at 760 Torr, enabling estimation of the plasma density. (For comparison, in Ar at 30 Torr, the RF diode signal represented by the pink dotted line drops almost to zero since the incident RF power is above the threshold power for breakdown, and the plasma density reaches the critical density).

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