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- W4321603342 abstract "GENRAY and CQL3D were used to estimate the Electron Bernstein Wave (EBW) current drive profiles and normalised current drive efficiency ζ CD (6) for several STEP reactor concepts with varying temperature, density, geometry and magnetic field. ζ CD > 1.0 was readily found for ρ = 0.65 − 0.9 while ζ CD > 0.5 was found for ρ ≥ 0.5. Okhawa is found to be the most efficient current drive mechanism due to the high trapped fraction in STEP. Optimal current drive was found for 2 nd harmonic absorption for ρ ≤ 0.8 due to the higher ν ⊥ at the wave-particle resonance. 1 st harmonic absorption is required for ρ > 0.8 as there is no access to the 2 nd harmonic at the launch frequencies examined. Rays with negative starting N ∥ were found to penetrate furthest. Due to the high electron temperature in STEP the relativistic downshift of the harmonic becomes comparable to the Doppler shift, increasing access to the 2 nd harmonic." @default.
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- W4321603342 date "2023-01-01" @default.
- W4321603342 modified "2023-10-13" @default.
- W4321603342 title "Electron Bernstein Wave (EBW) current drive profiles and efficiency for STEP" @default.
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- W4321603342 doi "https://doi.org/10.1051/epjconf/202327701011" @default.
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