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Observation of low magnetic field density peaks in helicon plasma
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10.1063/1.4802823
/content/aip/journal/pop/20/4/10.1063/1.4802823
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/4/10.1063/1.4802823
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the experimental set up.

Image of FIG. 2.
FIG. 2.

Axial magnetic field versus axial position for a current of 52.5 A passing through six coils in series. The coils are placed at −47.8 cm, −38.5 cm, −20.0 cm, −3.5 cm, +13 cm and +30 cm. Simulation (full line) and measurement (symbols).

Image of FIG. 3.
FIG. 3.

Plasma density on axis at z = 20 cm as a function of applied magnetic field for argon gas pressure 8 × 10−4 mbar and RF input power 400 W.

Image of FIG. 4.
FIG. 4.

Plasma density on axis at z = 20 cm versus magnetic field. (a) 300, 400, and 500 W RF power, p = 2 × 10−3 mbar, (b) 300, 400, and 500 W RF power, p = 0.8 × 10−3 mbar, and (c) 100, 200, and 350 W RF power, p = 0.4 × 10−3 mbar.

Image of FIG. 5.
FIG. 5.

Axial profile of the axial component of the wave magnetic field at two different (30 and 50 G) ambient magnetic fields.

Image of FIG. 6.
FIG. 6.

Axial wave magnetic field variation with time for p = 0.4 × 10−3 mbar, RF power = 350 W and B = 30 G at different axial location, z = 22 cm, 24 cm, 26 cm, 28 cm, and 30 cm from the antenna center.

Image of FIG. 7.
FIG. 7.

Variation of phase with distance for p = 0.4 × 10−3 mbar, RF power 350 W. B = 30 G (open circle) and B = 50 G (open diamond).

Image of FIG. 8.
FIG. 8.

Floating potential fluctuation amplitude variation with magnetic field measured for RF powers of 200 W (open circle), 300 W (open triangle), and 400 W (star) with argon fill in pressure of 0.8 × 10−3 mbar.

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/content/aip/journal/pop/20/4/10.1063/1.4802823
2013-04-24
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of low magnetic field density peaks in helicon plasma
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/4/10.1063/1.4802823
10.1063/1.4802823
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