ORPHEUS — Open Reactor Physics Educational University System

Neutron-transport theory and verified solvers, documented as one corpus: full derivations, design rationale, conventions, gotchas, and what verifies each equation.

Where to start. Theory and Derivations is the canonical entry — its part table routes by task (importing an equation, touching a solver, writing a reference). The S_N sub-book is the most developed method treatment (Discrete Ordinates Method (SN), with reading tracks and a symptom → chapter diagnostic table); the verification part — principles, harness, and the auto-generated V&V matrix — lives at Verification.

Theory & Derivations

• Theory and Derivations
  • The parts
  • Cross-cutting
  • Multiphysics

Architecture

• Architecture
  • The Layer Contract
  • The conceptual view — a Problem, a Solution, and the mathematics between them

Development

• Development — how ORPHEUS is built, and the source of the agent harness
  • ORPHEUS — start here
  • Development Workflow
  • The agent harness — what loads when, and how to change it
  • Workflows — phases, briefs, and the return contract
  • Lessons — index
  • Cardinal rules — five, in order of importance
  • Plan authoring — what a plan owes its own future author
  • Coding standards — the minimum-quality floor
  • Instrument doctrine — four statements every claim is held to
  • Articulation — the writing standard
  • Workflows — roles, invariants, and the routes work takes
  • Process discipline — bugs, completion, and issue hygiene
  • Code search in ORPHEUS — the shell’s grep, the harness’s tools and the project’s graph cases, beside the bundled nexus-tools rule
  • V&V test harness & test-execution standards
  • Documentation — a page says what is true now
  • V&V Principles — claim taxonomy, evidence hierarchy, anti-patterns
  • Coding Elegance core
  • Instrument doctrine — the procedures
  • Retirement audit — the numbered checklist
  • Agent definitions
  • Plan authoring — evidence
  • Coding standards — evidence
  • Process discipline — evidence
  • Code search in ORPHEUS — evidence
  • Lessons — bodies
  • V&V anti-patterns — evidence
  • Test-design failure modes — evidence
  • Coding elegance — evidence

API Reference

• Values (values)
  • The set
  • The equality
• Numerical Methods (numerics)
  • Power Iteration
  • The EigenvalueSolver Protocol
  • Operator Algebra (Wave A)
  • Field algebra (Depth B, step D-A)
  • API Reference
• Transport Operator Algebra (transport)
  • The TransportMethod Protocol
  • The phase spaces (transport.phase_spaces)
  • The exterior conditions (transport.boundary_conditions)
  • The absorbing chain
  • The reaction-rate functionals
  • The integral-kernel operators
  • The lift — how a binding meets its carrier
  • The role pair — flux ↔ source/sink, declared once
• Data Package (data)
  • Mixture
  • Synthetic cross sections
  • The declaration: Materials
  • Cell cross sections
  • Cells and channels
  • Citation
  • Energy-Group Structure and Condensation
• Geometry Infrastructure
  • Design Principles
  • Face Roles
  • Coordinate Systems
  • Structured geometry
  • Charts, lines and chords
  • Decks and the colouring symmetry
  • Rigid motions and permutations
  • The geometric extent
• Mesh
  • Where the mesh sits in the layers
  • Design Principles
  • Construction — the geometry to mesh path
  • Structured meshes
  • The Mesher
  • Interval rules and spacing rules
  • The 2-D mesh and its factory
  • Face roles
  • Axis primitives
  • The legacy-mesh adapter
• Specification (specification)
  • InfiniteMediumSpecification
  • GeometrySpecification
  • Specification
  • Coordinate
  • admit_observable()
  • WallAmplitudes
  • admit_exterior()
• Reference solutions (reference)
  • Readings
  • Withdrawals
  • Published solutions
  • The reference certificate
  • The reference solution
  • Verification
• Homogeneous Infinite-Medium Solver
  • Eigenvalue Problem
  • Implementation
  • API Reference
• Discrete Ordinates Solvers
  • Solver
  • The Problem
  • Angular Quadrature
  • Transport Sweep — the loss representations
  • Direct Transport Operator
  • Realized Boundary Law Operator (B)
  • ψ½ Coupled-Block Operators (A_BB, A_AB)
  • The Loss-Kernel Gauge (Pi)
• Collision Probability Solvers
  • Solver
• Method of Characteristics Solvers
  • Package Layout
  • Geometry Note: Cyclic Tracks
  • Integration with the Eigenvalue Loop
  • API Reference
• Monte Carlo Neutron Transport
  • Algorithmic Choices
  • Data Structures
  • Geometry
  • Source Iteration / Cycle Loop
  • API Reference
• 1-D Multigroup Diffusion Solver
  • Method mesh
  • Solver
  • Operators
  • Boundary realization
• Fuel Behaviour — 1-D Radial Thermo-Mechanics
  • Solver
• Thermal Hydraulics — Single-Channel LOCA
• Reactor Kinetics — 0-D Point Kinetics + TH
  • Physical Scope
  • Port of MATLAB Module 10
  • Point-Kinetics Equations
  • Data Classes
  • API Reference
• Analytical Derivations (derivations)
  • Submodules
  • The angular measure and its two lifts (Branch 1)
  • Reference-value registry
  • Verification case type
  • Withdrawn reference generators
  • The body a reference generator solves on
  • Homogeneous
  • Slab Collision Probability
  • Cylindrical Collision Probability
  • Diffusion
  • The reference kernel’s dense pencil
  • The characteristic reference
  • Kernels
  • Quadrature contract
  • Quadrature recipes (geometry-aware)

Knowledge Graph

Open interactive graph explorer — visualize the full code + documentation connectivity graph with filtering, search, and node inspection.

Indices and tables

• Index

• Module Index

• Search Page