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Millimeter wave scattering and diffraction in 110 GHz air breakdown plasma
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10.1063/1.4798424
/content/aip/journal/pop/20/4/10.1063/1.4798424
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/4/10.1063/1.4798424
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Experimental setup. (b) Time-integrated grayscale photo of plasma in yz plane. (c) Time-integrated photo of plasma in xz plane.

Image of FIG. 2.
FIG. 2.

(a) Measured incident power (dashed black line) waveform compared with transmitted power measured at θy  = 0° (solid blue line). Breakdown starts at 2.5 μs. (b) Power waveforms measured by diode placed at θy  = 10–170°.

Image of FIG. 3.
FIG. 3.

Angular intensity distribution (black circles) measured in (a) yz plane and (b) xz plane, relative to peak incident beam intensity, 1 μs after breakdown. Solid blue line shows Gaussian beam intensity distribution measured with no breakdown plasma.

Image of FIG. 4.
FIG. 4.

Peak scattered power measured in yz (red circles) and xz (black diamonds), relative to peak incident beam intensity, as a function of angle.

Image of FIG. 5.
FIG. 5.

(a) Diagram of plasma absorption model, showing Gaussian beam envelope (dashed line) and plasma cylinder. The beam propagates in the z direction. The small axes show the radial plasma density distribution inside the cylinder. (b) Fast-gated images taken in the yz plane using 10 ns shutter, at 150 ns, 300 ns, 1 μs, and 2 μs after the beginning of breakdown. The measured values of rp and Lp are shown to the right.

Image of FIG. 6.
FIG. 6.

Radial microwave amplitude for (a) rp = 1.4 mm and Lp = 10 mm, (b) rp = 1.9 mm and Lp = 5 mm, (c) rp = 4.3 mm and Lp = 4 mm, and (d) rp = 5.7 mm and Lp = 3 mm corresponding to the physical dimensions of the plasma at 150 ns, 300 ns, 1 μs, and 2 μs, respectively.

Image of FIG. 7.
FIG. 7.

Measured far-field diffraction patterns (circles) of beam passing through plasma at (a) 150 ns, (b) 300 ns, (c) 1 μs, and (d) 2 μs after the beginning of breakdown. The calculated unperturbed diffracted Gaussian beam (dashed blue line) is shown for reference against the calculated diffraction pattern from the absorption-diffraction model (solid red line).

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/content/aip/journal/pop/20/4/10.1063/1.4798424
2013-04-05
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Millimeter wave scattering and diffraction in 110 GHz air breakdown plasma
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/4/10.1063/1.4798424
10.1063/1.4798424
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