Add KIM collision-frequency scale#182
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Adds a positive
collision_frequency_scaleto KIM configuration. It multiplies calculated electron and ion collision frequencies before the Krook argument and Fokker-Planck susceptibility inputs are assembled. The default is 1, so existing collision formulas, profiles, units, and outputs are unchanged. The configured value is displayed and stored in HDF5 provenance.The periodized-background regression uses a scale of 3 and checks the resulting electron collision frequency against the existing Coulomb-logarithm formula.
Verification
Before:
test_periodized_background_feedfailed to compile because the configuration value did not exist.After: the focused regression passes; the full CMake build and all 30 CTest tests pass; bare
fopasses Static, Build, Tests, and Lint.An initial 64-point Krook scout at omega=1e5 overflowed above scale 1. PR 183 traced that result to interpolation of the derived
z0acrossk_parallel=0, not to the collision-frequency scale. Withz0recomputed from interpolated primitives, scales 1 through 3 remain finite. This PR supplies a controlled sensitivity parameter; it makes no benchmark-acceptance claim.Relation to Markus's Fokker-Planck periodic branch
This PR provides a controlled sensitivity parameter with a default-preserving implementation. It was used to diagnose the rejected Krook benchmark and is not an FP acceptance mechanism. Keep its provenance and regression independent of the periodic-FP decision in #191.