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@f0uriest f0uriest released this 08 Mar 21:43
· 11853 commits to master since this release
v0.4.13
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Learn about vigilant mode.

Major Changes

  • Updates JAX dependencies to take advantage of new functionality and faster compile times:
  • Minimum jax version is now 0.2.11
  • Minimum jaxlib version is now 0.1.69
  • Pressure and Iota perturbations now weight mode numbers by L**2 + M**2 to avoid high frequency noise.
  • Custom weighting also allowed by passing weights array to perturb functions
  • Refactor basis.get_idx to use a lookup table rather than np.where. This means it works under JIT and AD, but only allows scalar inputs. To get multiple indices, call the method multiple times
  • ConcentricGrid now accepts a rotation argument to rotate the grid for either 'sin' or 'cos' symmetry, or False for no symmetry. This is independent of the sym argument, which eliminates nodes with theta > pi.
  • Derivative operators for spline based profile and magnetic field classes are now precomputed, giving roughly 30-40% speedup in evaluation.

Bug Fixes

  • Fixed a bug where some properties were not copied correctly when doing obj.copy(deepcopy=True)
  • Fixed sign convention on poloidal quantities when saving to VMEC format
  • Fixed bugs in Curve and Surface that would fail when setting coefficients in JAX arrays

Testing

  • Add tests for Heliotron example
  • Adds timing benchmarks for standard equilibrium solves

Examples

  • Fix sign convention issue with Heliotron boundary modes to be consistent with VMEC
  • Add example for Simsopt QA stellarator from A. Bader et al. 2021

Miscellaneous

  • renamed opsindex to Index for consistency with JAX
  • Move sign function from utils to backend, as it now needs JAX
  • lots of minor formatting changes in docstrings

Github Commits <https://github.com/PlasmaControl/DESC/compare/v0.4.12...v0.4.13>_

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