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Investigating Impurity Transport and Particle Diffusion in Large Helical Device Using X-ray Diagnostics

This research focuses on the estimation of diffusion coefficients and convective velocities for Argon (Ar) in the Large Helical Device (LHD) using Si(Li) detectors. We analyze the time evolution of Ar Kα profiles, highlighting the phase shifts and their significance in particle diffusion. The effects of electron temperature on the line intensity and its correlation with Ar transport mechanisms are examined. By resolving the transport equation, we derive key profiles necessary for understanding density, decay rates, and penetration times, leading to insights into impurity behavior in plasma.

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Investigating Impurity Transport and Particle Diffusion in Large Helical Device Using X-ray Diagnostics

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  1. X-ray Diagnostics in Large Helical Device Diagnostics on X-ray Spectra I. Investigation for Impurity（1～10 keV） II.Investigation for High Energy Electron (20 keV～） III. New Type of Detectors for D-D Experiment

  2. I.Impurity tranport The Aim of the Present Research Estimations of Diffusion Coefficient and Convective Velocity for Ar by means of Si(Li) Detectors. Hydrogen Discharge in LHD

  3. Time Evolution of Ar Kα Profile Abel Inverted Ar Kα Profile

  4. Phase Shift of time evolution of Ar Kα Time Evolution of Ar Kα The electron temperature is approximately constant. The line intensity directly reflects the amount of Ar. The phase shift is important for the diffusion of particles.

  5. Radial Profile of Phase Shift The phase shift is corresponding to Ar penetration. The derivative of the phase shift is the diffusion.

  6. Transport Analysis Source term derived from respective ionized states is canceled in an assumption that the intensity of the Kα is not depending on ionized states.

  7. Strict Resolution of Transport Equation By the condition, the diffusion coefficient and the convective velocity are independently resolved. For the transport analysis, the penetration profile, the density profile, and the decay rate are necessary.

  8. Tayler Expansion of Diffusion Coefficient minor radius penetration time at plasma center Averaged Diffusion Coefficient Parabolic Approximation

  9. Tayler Expansion of Convective Velocity Penetration Profile Density Profile Decay Rate Decay rate The convective velocity reflects the density profile.

  10. Radial Profile of Diffusion Coefficient and Convective Velocity for Ar in LHD

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