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- W2025855132 abstract "A matrix inversion technique has been developed to calculate local x‐ray emissivity profiles from line‐integrated x‐ray measurements from an anisotropic source. A 2D hard x‐ray camera has been used to measure tangential line‐integrated bremsstrahlung emission from suprathermal electrons generated by lower hybrid current drive in the PBX‐M tokamak. Local emissivities, E, on the midplane of the tokamak are useful to localize the lower hybrid‐driven current. The anisotropy is assumed to be uniform over the plasma with a form E(R,θ)=E(R)cosn(θ), where E(R) is the forward emissivity at the major radius R, θ is the angle to the camera from tangency, and the exponent n defines the degree of anisotropy. For isotropic emission, n=0. The measured brightness B(R) on the midplane is then related to the forward emissivity E(R) by a matrix M=L(R,φ)cosn[θ(R,φ)], where φ is the toroidal angle, L is a length matrix containing the path lengths through the plasma. By inverting the matrix M, the forward emissivity is obtained from the measured brightness, E=M−1B. The anisotropy exponent n is adjusted to match the emission at the inner and outer radii of the plasma." @default.
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- W2025855132 date "1995-01-01" @default.
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- W2025855132 title "Inversion technique to obtain an emissivity profile from tangential line‐integrated hard x‐ray measurements" @default.
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- W2025855132 doi "https://doi.org/10.1063/1.1146350" @default.
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