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- W1653937613 abstract "The penetration of a rf field excited by double-loop m = 0 antenna into helicon plasma is considered at high collisionality. A narrow sheath of intense azimuthal plasma current is shown to arise underneath the antenna due to the generation of strongly damping electrostatic TrivelpieceGould waves via mode conversion of the helicon waves. The radial width of the sheath is substantially smaller than the collisional skin size and drops inversely proportionally to the external magnetic field. The dependence of the plasma load resistance on density saturates when the plasma countercurrent becomes strong enough to cancel the antenna fields in the bulk plasma. Measured and computed values of resistance are shown to agree well under various conditions. Inductively Coupled Plasma (ICP) Unmagnetized (B0 = 0 or ωce ω) δc = δ (2νe/ω) νe: electron collision frequency ωce, ωpe: electron cyclotron and plasma frequencies Helicon Plasma Magnetized (ωce > νe), high-density (ωpe ωce) Dispersion relation k||kt(ωce /ω) − 2 t k (1+iνe/ω) = δ −2 Axially uniform field (k|| = 0) δ|| δ δc Nonuniform field (k||δ ! ω /ωce) Helicon (fast) waves klow klow Im (TG) ⊥ k ≈ δ (νe/ω) (k||δωce/ω)[1+ 2 e ν /ω ] klow = δ 2(ω /ωce), kup = δ (ω /ωce) Mode conversion H → TG Surface Bulk (TG) r E ≈ i e ce iν ω ω + (H) θ E (at r = r0) PH→TG ≈ −e ∫φ v⋅∇n0dV LOW AND HIGH COLLISIONALITY ra Ia2 za CF CF m=0 antenna Double R d b Plasma Vacuum Ia1 r0 z L THEORETICAL MODEL Full electromagnetic code Cold-plasma dielectric tensor Axial and azimuthal Fourier transforms Electron collisions: νe = νen + νei zA = − 20 cm, b = 2 cm, d = 1 cm r0 = 2.5 cm, rA = 3 cm, zL = − 80 cm, zR = 80 cm 0 50 100 150 0,0 0,2 0,4 0,6 0,8 1,0 A n t e nn a Sp e c t r a lI nt en sit y( a . u . ) Axial Wavenumber, lz = k|| L/π P Currents AP Currents Antenna spectrum 0 10 20 30 40 0.0 0.5 1.0 1.5 Im k⊥ Re k⊥ 1/δc TG TG B0 = 100 G k ⊥ ( c m -1 ) Axial Wavenumber, k||L /π WAVE DISPERSION n0 = 2×10 cm, pAr = 51 mTorr ABSORPTION SPECTRA Rplasma = Σ Rpartial" @default.
- W1653937613 created "2016-06-24" @default.
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- W1653937613 date "2001-10-01" @default.
- W1653937613 modified "2023-09-24" @default.
- W1653937613 title "RF Field Shielding by Electrostatic Waves in High Pressure Helicon Plasmas" @default.
- W1653937613 hasPublicationYear "2001" @default.
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