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@f0uriest f0uriest released this 20 Mar 23:01
· 4769 commits to master since this release
v0.11.0
04b0cf8
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Learn about vigilant mode.

New Features

  • Adds functionality to optimize for omnigenity. This includes the OmnigenousField
    magnetic field class, the Omnigenity objective function, and an accompanying tutorial.
  • Adds new objectives for free boundary equilibria: BoundaryError and
    VacuumBoundaryError, along with a new tutorial notebook demonstrating their usage.
  • Objectives Volume, AspectRatio, Elongation now work for
    FourierRZToroidalSurface objects as well as Equilibrium.
  • MagneticField objects now have a method save_mgrid for saving field data
    in the MAKEGRID format for use with other codes.
  • SplineMagneticField.from_mgrid now defaults to using extcur from the mgrid file.
  • When converting a near axis solution from QSC/QIC to a desc Equilibrium, the
    least squares fit is now weighted inversely with the distance from the axis to improve
    the accuracy for low aspect ratio.
  • Adds a bounding box to the field_line_integrate defined by bounds_R and bounds_Z
    keyword arguments, which form a hollow cylindrical bounding box. If the field line
    trajectory exits these bounds, the RHS will be multiplied by an exponentially decaying
    function of the distance to the box to stop the trajectory and prevent tracing the field
    line out to infinity, which is both costly and unnecessary when making a Poincare plot,
    the principle purpose of the function.
  • Adds a new class DommaschkPotentialField which allows creation of magnetic fields based
    off of the vacuum potentials detailed in Representations for Vacuum Potentials in Stellarators
    https://doi.org/10.1016/0010-4655(86)90109-8.

Speed Improvements

  • CoilSet is now more efficient when stellarator or field period symmetry is used.
  • Improves the efficiency of proximal optimizers by reducing the number of objective
    derivative evaluations. Optimization steps should now be 2-5x faster.
  • Improved performance of Zernike polynomial evaluation.
  • Adds a bounding box to the field_line_integrate defined by bounds_R and bounds_Z
    keyword arguments, which form a hollow cylindrical bounding box. If the field line
    trajectory exits these bounds, the RHS will be multiplied by an exponentially decaying
    function of the distance to the box to stop the trajectory and prevent tracing the
    field line out to infinity, which is both costly and unnecessary when making a Poincare
    plot, the principle purpose of the function.

Bug Fixes

  • Fix bug causing NaN in ForceBalance objective when the grid contained nodes at
    the magnetic axis.
  • When saving VMEC output, buco and bvco are now correctly saved on the half
    mesh. Previously they were saved on the full mesh.
  • Fixed a bug where hdf5 files were not properly closed after reading.
  • Fixed bugs relating to Curve objects not being optimizable.
  • Fixed incorrect rotation matrix for FourierPlanarCurve.
  • Fixed bug where plot_boundaries with a single phi value would return an
    empty plot.

Breaking Changes

  • Renames the method for comparing equivalence between DESC objects from eq to equiv
    to avoid confusion with the common shorthand for Equilibrium.
  • Minimum Python version is now 3.9

Github Commits

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