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A cusp field or and end block can greatly increase the density

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Presentation on theme: "A cusp field or and end block can greatly increase the density"— Presentation transcript:

1 A cusp field or and end block can greatly increase the density
G. Chevalier and F.F. Chen, Experimental modeling of inductive discharges, J. Vac. Sci. Technol. A 11, 1165 (1993)

2 Radial mode structure is m = +1, even when antenna is made to excite m = –1
M. Light and F.F. Chen, Helicon Wave Excitation with Helical Antennas, Phys. Plasmas 2, 1084 (1995) RH antenna LH antenna

3 Axial beating of radial modes
M. Light, I.D. Sudit, F.F. Chen, and D. Arnush, Axial Propagation of Helicon Waves, Phys. Plasmas 2, 4094 (1995)

4 Density is peaked 50 cm downstream, due to pressure balance
I.D. Sudit and F.F. Chen, Discharge equilibrium of a helicon plasma, Plasma Sources Sci. Technol. 5, 43 (1996)

5 Helical antennas are directional; Nagoya IIIs are not
F.F. Chen, I.D. Sudit, and M. Light, Downstream physics of the helicon discharge, Plasma Sources Sci. Technol. 5, 173 (1996) Helical antennas are directional; Nagoya IIIs are not Beating length and KTe decay agree with theory

6 Rotating the field with a bifilar antenna is better than spatial rotation with helical antennas
D.G. Miljak and F.F. Chen, Helicon wave excitation with rotating antenna fields, Plasma Sources Sci. Technol. 7, 61 (1998)

7 Injecting from both ends does not increase the density because of neutral depletion
D.G. Miljak and F.F. Chen, Density limit in helicon discharges, Plasma Sources Sci. Technol. 7, 537 (1998)

8 Half wavelength helical antennas are better than full wavelength antennas
L. Porte, S.M. Yun, F.F. Chen, and D. Arnush, Superiority of half-wavelength helicon antennas, LTP-110 (Oct. 2001)

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