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A mode converter to generate a Gaussian-like mode for injection into the VENUS electron cyclotron resonance ion sourcea)
a)Contributed paper, published as part of the Proceedings of the 15th International Conference on Ion Sources, Chiba, Japan, September 2013.
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10.1063/1.4832064
/content/aip/journal/rsi/85/2/10.1063/1.4832064
http://aip.metastore.ingenta.com/content/aip/journal/rsi/85/2/10.1063/1.4832064

Figures

Image of FIG. 1.
FIG. 1.

Shape of the TE to TE mode converter showing the displacement of the axis versus length. The maximum displacement of the axis is 4.7 mm over the 0.65 m converter, which has a diameter of 31.5 mm.

Image of FIG. 2.
FIG. 2.

Calculated mode conversion along the curvilinear path length z. The conversion from TE to TE is 97%. The excitation of some of the undesirable modes is also illustrated. The modes included in the calculation are the TE, TE, TE, TE, TM, TM, TM, and TM.

Image of FIG. 3.
FIG. 3.

The TE to TE mode converter prior to assembly into the new injection system of VENUS.

Image of FIG. 4.
FIG. 4.

Calculated power distribution for the HE mode in W/m2 across the circular waveguide assuming a total power of 1 W in the waveguide.

Image of FIG. 5.
FIG. 5.

The new injection assembly incorporates the 28 GHz mode converters. The large diameter aperture on the plasma screen shown in the lower left corner is the launch point of the 28 GHz in the HE mode. The smaller rectangular opening is to launch the 18 GHz microwave power.

Tables

Generic image for table
Table I.

Chebyshev coefficients for the mode converter.

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/content/aip/journal/rsi/85/2/10.1063/1.4832064
2013-12-05
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A mode converter to generate a Gaussian-like mode for injection into the VENUS electron cyclotron resonance ion sourcea)
http://aip.metastore.ingenta.com/content/aip/journal/rsi/85/2/10.1063/1.4832064
10.1063/1.4832064
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