Study of a scalable large-area radio-frequency helicon plasma source
نویسندگان
چکیده
A large-area planar spiral antenna has been installed on the linear laboratory device VINETA. For low radio-frequency (RF ) powers the induction coil is operated in the inductive discharge mode with typical plasma densities of n ≈ 1 · 10 m and electron temperatures of Te ≈ 5 eV. At higher RFpowers a transition to the helicon wave sustained discharge mode is observed, in which the density increases by a factor of 200 and Te drops by a factor of 2. Detailed measurements of the helicon wavefield show that a helicon wave with azimuthal modenumber m = 0 is launched. Due to the larger wave excitation region of the m = 0 discharges the width of the plasma density profile in the helicon mode increases by a factor of 1.5 compared the standard VINETA helicon operation with a helical m = +1 antenna. PACS numbers: 52.50.-b,52.40.Fd
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