[d-burg]

Release note

• Audience: users
• Numerical impact: none (harness @ f968890)
• Migration: none

Two docstrings still called chi_tor a heat diffusivity. They now describe it as χ_φ, the toroidal momentum diffusivity, which sets the momentum Prandtl number P_tor = τ_R/τ_φ with τ_φ = r_s²/χ_φ (Fitzpatrick, Phys. Plasmas 30, 092512 (2023)). Docstrings only.

Changes

• build_slayer_inputs (LayerInputs.jl): chi_tor is the toroidal momentum diffusivity, not a "toroidal heat diffusivity".
• SLAYER parameter table (LayerParameters.jl): the P_tor row reads τ_R/τ_φ with τ_φ = r_s²/χ_φ, instead of the undefined τ_‖tor.

Regression report

regress --cases diiid_slayer_n1 --refs 057c4af0d,f9688909c --force on feynman (SLURM, 8 threads; develop vs this head, both fresh, manifest pinned): every quantity unchanged. The docs build passes.

diiid_slayer_n1

Regression Report: diiid_slayer_n1
=========================================================================
Ref 1: 057c4af0d  @ 057c4af0d (2026-10-28)
       env: julia 1.11.9, x86_64-linux-gnu, manifest 3136d36b (pinned), 8 threads/8 BLAS, jit build
Ref 2: f9688909c  @ f9688909c (2026-10-28)
       env: julia 1.11.9, x86_64-linux-gnu, manifest 3136d36b (pinned), 8 threads/8 BLAS, jit build
-------------------------------------------------------------------------
Quantity                            057c4af0d  f9688909c  Diff     Status
-------------------------------------------------------------------------
SLAYER surface indices              [6 elem]   [6 elem]   0.0e+00  OK
SLAYER poloidal m                   [6 elem]   [6 elem]   0.0e+00  OK
SLAYER toroidal n                   [6 elem]   [6 elem]   0.0e+00  OK
SLAYER minor radius rs              [6 elem]   [6 elem]   0.0e+00  OK
SLAYER r-based shear                [6 elem]   [6 elem]   0.0e+00  OK
SLAYER Lundquist S                  [6 elem]   [6 elem]   0.0e+00  OK
SLAYER D_norm                       [6 elem]   [6 elem]   0.0e+00  OK
SLAYER P_perp                       [6 elem]   [6 elem]   0.0e+00  OK
SLAYER tauk                         [6 elem]   [6 elem]   0.0e+00  OK
SLAYER iota_e                       [6 elem]   [6 elem]   0.0e+00  OK
SLAYER Q_e                          [6 elem]   [6 elem]   0.0e+00  OK
SLAYER Q_i                          [6 elem]   [6 elem]   0.0e+00  OK
SLAYER Q_root [2/1,3/1,4/1]         [3 elem]   [3 elem]   0.0e+00  OK
SLAYER ω_Hz [2/1,3/1,4/1]           [3 elem]   [3 elem]   0.0e+00  OK
SLAYER γ_Hz [2/1,3/1,4/1]           [3 elem]   [3 elem]   0.0e+00  OK
SLAYER no_root flags [2/1,3/1,4/1]  [3 elem]   [3 elem]   0.0e+00  OK
SLAYER enabled flag                 1          1          0.0e+00  OK
Runtime (s)                         293.1s     284.0s              --
=========================================================================
Summary: 17 unchanged

Notes for reviewers

• Rebuilt on develop. InnerLayer.SLAYER - FEATURE! - Build P_perp from the perpendicular particle diffusivity by default and add an ion heat diffusivity profile #501 already corrected the slayer_parameters and SLAYERControl docstrings that this PR originally changed, so the branch was rebuilt from develop 057c4af0d with only the two lines InnerLayer.SLAYER - FEATURE! - Build P_perp from the perpendicular particle diffusivity by default and add an ion heat diffusivity profile #501 left. The previous head is kept on backup/471-pre-rebuild-b2d00c886.

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