Can you discuss your knowledge of plasma equilibrium reconstruction algorithms for reversed-field pinches?

Sample interview questions: Can you discuss your knowledge of plasma equilibrium reconstruction algorithms for reversed-field pinches?

Sample answer:

Equilibirum Reconstruction Techniques for Reversed-Field Pinches (RFPs)

RFPs are unique toroidal fusion devices with a complex plasma behavior and strong magnetic shear. Equilibrium reconstruction algorithms play a crucial role in understanding and controlling RFP plasmas.

Reconstruction Approaches:

  • Analytical Models: Simplified analytical models based on force balance equations and assumed plasma profiles.
  • Numerical Codes: Use numerical techniques (e.g., finite element analysis, magnetohydrodynamic simulations) to solve for the equilibrium solution.
  • Data-Driven Methods: Utilize experimental measurements (e.g., magnetic diagnostics, spectroscopy) to estimate the equilibrium parameters.

Specific Algorithms for RFPs:

  • FLUX-C: 1D code that solves the Grad-Shafranov equation for cylindrical geometry, taking into account the specific boundary conditions of an RFP.
  • 3DR-FIT: 3D code that reconstructs the equilibrium using experimental magnetic field data and a set of basis functions.
  • RTQLIB: Reconstruction library that includes various algorithms, including those tailored for RFPs, such as the non-linear force-fit method and the EFIT-like equilibrium solver.
  • JFIT: 1D code that estimates the current profile from magnetic field and … Read full answer

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