c5133401e0
Multi-session work bundle on a draft branch. Splits into a clean
sequence of commits later; pushed here so it isn't lost on a reboot.
Reach work
- code/scripts/reach/reach_scram_pj.jl: shutdown_margin halfspace
X_exit (replaces "n <= 1e-4 AND T_f bound" framing); per-step
envelope extraction added.
- code/scripts/reach/reach_scram_pj_fat.jl: per-step envelope
extraction added; shutdown_margin discharge logic mirrored from the
tight scram script. 3 probes (10/30/60s) all discharge from the
fat union polytope.
- code/scripts/reach/reach_scram_full_fat.jl (NEW): full nonlinear
PKE scram reach with fat entry. Hits the stiffness wall at
~1.5 s plant time as expected; saves NaN-tolerant per-step
envelopes. Demonstrates concretely why PJ is the right tool for
the longer-horizon proof.
- code/scripts/reach/reach_heatup_pj.jl: T_REF_START_C constant
(entry-conditioned ramp) replaces T_STANDBY-init that was making
the FL controller command cooling at t=0. Per-step extraction
already in place.
- code/configs/heatup/tight.toml: bumped maxsteps; probe horizon
parameterized.
Hot-standby SOS barrier
- code/scripts/barrier/barrier_sos_2d_shutdown.jl (NEW): mirrors the
operation SOS machinery on the hot-standby thermal projection.
Includes the eps-slack pattern (so feasibility doesn't silently
collapse to B == 0).
- code/scripts/barrier/barrier_sos_2d.jl: refactored to use the same
helper.
- code/src/sos_barrier.jl (NEW): solve_sos_barrier_2d helper module
factoring out the SOS construction; eps-slack with eps_cap=1.0 to
avoid unbounded primal.
Library
- code/src/pke_states.jl (NEW): single source of truth for canonical
initial-condition vectors per DRC mode (op, shutdown, heatup) keyed
off plant + predicates.
- code/scripts/sim/{main_mode_sweep,validate_pj}.jl, code/CLAUDE.md:
migrated to pke_states.
Predicates + invariants
- reachability/predicates.json: new shutdown_margin predicate (1%
dk/k tech-spec floor, expressed as alpha_f*T_f + alpha_c*T_c
halfspace). Used as scram X_exit.
Plot script
- code/scripts/plot/plot_reach_tubes.jl: plot_tubes_scram_pj() with
variant=:fat|:tight knob; plot_tubes_scram_full() for full-PKE
3-panel (T_c, T_f, rho); plot_tubes_heatup_pj() reads results/
not reachability/.
Journal + memory
- journal/entries/2026-04-27-shutdown-sos-and-scram-X_exit.tex (NEW):
long-form entry on the SOS hot-standby barrier and the scram X_exit
refactor.
- journal/journal.tex: input chain updated.
- claude_memory/ — three new session notes:
* 2026-04-27-scram-X_exit-shutdown-margin.md
* 2026-04-28-DICE-2026-conference-intel.md (people, sessions,
strategic notes for the May 12 talk)
* 2026-04-28-path1-sos-pj-sketch.md (sketch of nonlinear-SOS via
polynomial multiply-through; saved for an overnight session)
Docs
- docs/model_cheatsheet.md (NEW): one-page reference of state vector,
dynamics, constants, modes, predicates, sanity numbers — the talk
prep cheatsheet Dane asked for.
- docs/figures/reach_*_tubes.png: regenerated with the new mat data.
- presentations/prelim-presentation/outline.md: revised arc per the
April-28 review pass (cuts: Lyapunov-fails standalone slide,
operation-tube standalone slide, SOS standalone; adds: scopes-of-
control framing, scram on the headline result slide).
- app/predicate_explorer.jl: minor.
Hacker-Split: end-of-session scratch bundle
83 lines
2.7 KiB
TeX
83 lines
2.7 KiB
TeX
% journal.tex — top-level document that aggregates all dated entries.
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%
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% Build:
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% cd journal && latexmk -pdf journal.tex
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% or individual entry:
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% cd journal && latexmk -pdf entries/2026-04-17-controllers-linear-reach.tex
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\input{preamble.tex}
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\title{HAHACS Lab Journal\\
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\large PWR\_HYBRID\_3 preliminary example, invention log}
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\author{Dane Sabo, with Claude (Hacker-Split)}
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\date{Started \today}
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\begin{document}
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\maketitle
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\tableofcontents
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\newpage
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\section*{How to read this journal}
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Each section is a dated session. Sessions are written in two styles:
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\begin{itemize}
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\item \textbf{Deep (A-style)}: full invention-log depth. Derivations
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in math, code snippets with commentary, figures with long
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captions, dead-ends documented, terminal output included where
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it changes the story. A reader in 2030 should be able to
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rebuild the work from this alone.
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\item \textbf{Narrative (B-style)}: end-of-session notes with
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pointers. Marked with \apass{some detail} callouts for
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content that should be expanded in a later A-pass.
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\end{itemize}
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\textbf{File-path archaeology note.} Entries dated on or before
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2026-04-20 (afternoon) refer to MATLAB files under \texttt{plant-model/}
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and a MATLAB-Julia split where Julia code lived under \texttt{julia-port/}.
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The 2026-04-20 evening mega-session ported everything to Julia and
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deleted MATLAB; the result is the unified \texttt{code/} directory.
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Path references in earlier entries are historically accurate for their
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date; recover the corresponding sources via \texttt{git log} or the
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parent commit at the time.
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Callout boxes signal specific content types:
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\begin{derivation}
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Mathematical derivations — algebra, integrals, limits. Where they
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matter to the safety claim, they live here in full.
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\end{derivation}
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\begin{decision}
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Design decisions made during the session, with the rationale and the
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alternatives considered.
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\end{decision}
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\begin{deadend}
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Approaches that didn't work and why. These are as valuable as the
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working paths — they keep the next explorer from repeating the mistake.
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\end{deadend}
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\begin{limitation}
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Known-approximate or known-broken behavior. Soundness gaps live here.
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Each limitation ties to a plan or an open question.
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\end{limitation}
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\newpage
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% ---- Session entries, in chronological order -------------------------------
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\input{entries/2026-04-17-controllers-linear-reach.tex}
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\newpage
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\input{entries/2026-04-20-predicates-boundaries-julia-nonlinear.tex}
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\newpage
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\input{entries/2026-04-20-evening-mega-session.tex}
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\newpage
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\input{entries/2026-04-20-overnight-prompt-jump.tex}
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\newpage
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\input{entries/2026-04-21-polytopic-sos-tikhonov.tex}
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\newpage
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\input{entries/2026-04-27-shutdown-sos-and-scram-X_exit.tex}
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\end{document}
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