# Archived axis-biased Fourier seed campaign

```{admonition} Stopped seed audit
:class: warning
This 200 nm silicon / 1.35 µm run was stopped on 2026-08-24 after 20
continuous-discovery updates. It is preserved but is not the active campaign.
```

This restart corrected the earlier solid-slab initialization, but its random
seed was generated on a rectangular nonnegative mode-index grid. The radial
index envelope unintentionally favored modes with either kx=0 or ky=0 and
omitted one of the two oblique orientations. The live spectrum made that bias
visible before substantial compute was spent.

## Frozen outcome

| Quantity | Value |
|---|---:|
| Updates | 20 |
| Initial LDOS / vacuum | 0.573570 |
| Final and best LDOS / vacuum | 0.652525 |
| Projection beta | 1.142857 |
| Mean grayness 4ρ(1−ρ) | 0.823819 |
| Reduced-design fill | 44.540% |
| Independent Fourier coefficients | 13,725 |

At update 12, 36.7% of the seed power lay exactly on a coordinate axis and
52.3% lay within 15 degrees of one. The optimizer was already correcting the
bias—those values fell to 26.3% and 44.6%, while diagonal-sector power rose
from 12.8% to 18.9%—but an isotropic seed is a cleaner experiment.

## Geometry and history

```{figure} ../_static/generated/fourier_atom_hole_axis_seed_final_geometry.png
:alt: Initial and final continuous geometry of the axis-biased seed campaign
```

```{figure} ../_static/generated/fourier_atom_hole_axis_seed_final_progress.png
:alt: LDOS and continuation history of the axis-biased seed campaign
```

## Coefficients and field

```{figure} ../_static/generated/fourier_atom_hole_axis_seed_final_spectrum.png
:alt: Cross-shaped Fourier spectrum that exposed the seed anisotropy
```

```{figure} ../_static/generated/fourier_atom_hole_axis_seed_final_field.png
:alt: Final Ez field from the axis-biased seed campaign
```

The immutable archive is
`benchmarks/artifacts/invdes_fourier_atom_hole_ldos_spectral_discovery_v2.rejected_axis_biased_seed_20260824.npz`
with SHA-256
`b22dd11ad2f8f94e57ba9e8691fdb10ba7475efca4b3158f6693438e00203b15`.