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InnerLayer.SLAYER - Add D_perp, tau_E and other options for P_perp #509

Description

@ebursch

Summary

The InnerLayer (IL) SLAYER model has a single way to build the perpendicular Prandtl number P_⊥, from the electron perpendicular heat diffusivity χ⊥,e. Add a [SLAYER] P_perp_model option so P_⊥ can be built from the closures in the layer-theory literature, and an optional ion perpendicular heat diffusivity chi_i profile in the kinetic HDF5 schema to feed them.

Implemented in #501.

Options

P_perp_model P_⊥ Reference
chi_perp_e τ_R χ⊥,e / r_s² (current behaviour) —
chi_perp_i τ_R χ⊥,i / r_s² —
D_perp τ_R D⊥ / r_s², with D⊥ from c_β, η, χ⊥,e, χ⊥,i and the n, T gradients Fitzpatrick, Phys. Plasmas 29, 032507 (2022), Eq. 16
c_beta c_β², the χ⊥ → 0 limit of D_perp (a floor on P_⊥) J.-K. Park, Phys. Plasmas 29, 072506 (2022), Eq. 10, thermal-conduction term K dropped
P_phi P_⊥ = P_φ Fitzpatrick, Phys. Plasmas 30, 092512 (2023), Eq. 143
tau_E P_⊥ = P_φ = τ_R / τ_E, from a user-supplied tau_E [s] Fitzpatrick, Phys. Plasmas 30, 092512 (2023), Eq. 131

Interface

  • New [SLAYER] P_perp_model and tau_E keys in gpec.toml.
  • chi_perp renamed to chi_perp_e in [SLAYER] and in the build_slayer_inputs / slayer_parameters keywords.
  • Optional chi_i dataset in the kinetic HDF5 file, read only by the models that need it.

The default model is tracked separately in #508.

Activity

  1. added this to the GPEC v2.0.0 milestone on Oct 6, 2026
  2. self-assigned this
    on Oct 6, 2026
  3. assigned and unassigned on Oct 6, 2026
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