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Advanced Simulations for the ITER LH Launcher

This study presents advanced simulations utilizing the TOPLHA modeling framework for the ITER LH launcher. Featuring various reference geometries (Ia, Ib, Ic, II, III), the performance of single and multiple PAM modules with active and passive waveguides is analyzed. Key results include return loss metrics, power spectra computations, and current field distributions at cutoff densities. Future steps aim to optimize the launcher design and extend modeling to the complete antenna system, refining electric field outputs and enhancing performance predictions in the context of plasma interactions.

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Advanced Simulations for the ITER LH Launcher

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  1. Advanced Simulations for the ITER LH Launcher D. Milanesio, R. Maggiora

  2. TOPLHA Modeling – Reference Geometry Ia • Single PAM module • 8 active waveguides (in dark color) • 9 passive waveguides (in light color) • Main dimensions reported in the zoomed view • Passive waveguides are short-circuited after λg/4 • Flat geometry

  3. TOPLHA Modeling – Reference Geometry Ib • Poloidal curvature added to the flat geometry 2 mm

  4. 3 mm TOPLHA Modeling – Reference Geometry Ic • Both poloidal and toroidal curvature added to the flat geometry 2 mm

  5. HFSS scattering matrix has been adopted to account for the PAM module The return loss is plotted at the generator side of a PAM module λ = densityedge/Δdensity TOPLHA Results – Return Loss (Ref.Geo. Ia)

  6. HFSS scattering matrix has been adopted to account for the PAM module The return loss is plotted at the generator side of a PAM module λ = 2 mm TOPLHA Results – Return Loss (Ref.Geo. Ia/b/c)

  7. All active waveguides have been fed with 270° phase increment TOPLHA Results: Power Spectra (Ref.Geo. Ia) Power spectra are computed assuming the entire antenna delivers 20MW of power

  8. TOPLHA Results: Current & Fields (Ref.Geo. Ia) @ cutoff density λ = 2 mm

  9. An arc is modeled as a metal strip connecting the two sides of the waveguide “aperture” TOPLHA Modeling – Reference Geometry II • Single PAM module • 8 active waveguides (in dark color) • 9 passive waveguides (in light color) • Few active waveguides are short-circuited at the mouth to mimic an arc (in blue) • Passive waveguides are short-circuited after λg/4 • Flat geometry

  10. HFSS scattering matrix has been adopted to account for the PAM module The return loss is plotted at the generator side of a PAM module λ = 2 mm TOPLHA Results – Return Loss (Ref.Geo. II)

  11. TOPLHA Results: Current & Fields (Ref.Geo. II)

  12. TOPLHA Modeling – Reference Geometry III • Three PAM modules • 24 active waveguides (in dark color) • 25 passive waveguides (in light color) • Main dimensions reported in the zoomed view • Passive waveguides are short-circuited after λg/4 • Flat geometry

  13. HFSS scattering matrix has been adopted to account for the PAM module The return loss is plotted at the generator side of a PAM module λ=densityedge/Δdensity An extensive comparison between TOPLHA and ALOHA can be found in J.Hillairet’s presentation TOPLHA Results – Return Loss (Ref.Geo. III)

  14. Next Steps • Optimization of the front part of the launcher • Extension to the full antenna

  15. On Electric Fields Interpolated output (done by Gid) Vs. Standard TOPLHA output The magnetic current value is computed on the mid-point of central edges (exact values); then, each triangle is colored according to the sum of the RWG functions defined on it

  16. On Electric Fields • The difference between ALOHA and TOPLHA in terms of maximum Epar increases with the density • This difference can se significantly reduced: • Adopting the real TOPLHA output instead of the interpolated one • Increasing the number of functions on the aperture

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