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A microwave interferometer for small and tenuous plasma density measurements
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10.1063/1.4797470
/content/aip/journal/rsi/84/3/10.1063/1.4797470
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/3/10.1063/1.4797470
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental results: (I, Q) components attenuation vs the frequency difference between S(t) and R(t).

Image of FIG. 2.
FIG. 2.

Phase error versus the input signal attenuation. 0 dB corresponds to 2 Vpp.

Image of FIG. 3.
FIG. 3.

Interferometer layout.

Image of FIG. 4.
FIG. 4.

Example of ray tracing calculation.

Image of FIG. 5.
FIG. 5.

Test of slab approximation using a Plexiglas cube with cylindrical hole. D is the diameter of the hole, w the width of the Plexiglas and the distance between the horns, A is the horn aperture, and L its length.

Image of FIG. 6.
FIG. 6.

Ray tracing calculation (solid line) end experimental measurements (full circles) of the phase shift of cylindrical holes in Plexiglas block plotted versus the hole diameters.

Image of FIG. 7.
FIG. 7.

Phase shift due to plasma cylinder versus cylinder diameter for various density, calculated by ray tracing (red thick line) and by slab approximation (thin gray line).

Image of FIG. 8.
FIG. 8.

Phase shift due to plasma cylinder versus the plasma density, for various plasma diameters, calculated by ray tracing (red thick line) and by slab approximation (thin gray line).

Image of FIG. 9.
FIG. 9.

Phase noise spectrum of the interferometer.

Image of FIG. 10.
FIG. 10.

RF plasma source layout along with the magnetic field topology.

Image of FIG. 11.
FIG. 11.

Phase and normalized amplitude change at the plasma start-up.

Image of FIG. 12.
FIG. 12.

Picture of the interferometer installed on the mini helicon space thruster.

Image of FIG. 13.
FIG. 13.

Mass flow scan experiment, at fixed power (50 W).

Image of FIG. 14.
FIG. 14.

Mass flow and power scan in a different thruster configuration.

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/content/aip/journal/rsi/84/3/10.1063/1.4797470
2013-03-28
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A microwave interferometer for small and tenuous plasma density measurements
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/3/10.1063/1.4797470
10.1063/1.4797470
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