A Sun in a Bottle.

Fusion is humanity learning to safely contain the power of a star. Our work is to make that learning legible.

Five commitments the project holds itself to.

• GOAL_01

  Make fusion understandable.

  Strip the field of jargon without stripping its rigor. Every concept next to a diagram, every diagram next to a working model.

• GOAL_02

  Build an educational simulator.

  A browser-native fusion sandbox — no installs, no accounts, no walled datasets. Learning should be one URL away.

• GOAL_03

  Democratize advanced simulation.

  Give students and independent researchers access to tools that today live only inside national laboratories.

• GOAL_04

  Inspire future engineers.

  The people who will finish this problem are still choosing what to study. Show them the machine, and it will pull them in.

• GOAL_05

  Build completely in public.

  Charter, code, notes, mistakes — everything on the shelf. The Lab Notes are the primary artifact.

The instrument, as a set of connected modules.

FusionTwin is not one program. It is a small constellation of pieces, each responsible for one honest thing, wired together by clean data.

A slow, deliberate build.

Six phases, each with a clear artifact. Progress here matters less than honesty about where the work stands today.

1. Phase 01IN_PROGRESS

   Foundation

   Charter, repository, scientific bibliography, and the first architectural sketches. Establish the vocabulary of the project.

   ↓
2. Phase 02PLANNED

   Simulation Engine

   A minimal 0-D plasma model coupled to a coil circuit. Enough physics to be honest, small enough to run in a browser tab.

   ↓
3. Phase 03PLANNED

   Visualization

   Interactive cross-sections of the vessel, magnetic field lines, and the plasma boundary. The instrument becomes visible.

   ↓
4. Phase 04PLANNED

   Educational Platform

   Guided lessons that walk from first principles to a working confinement scenario. Each concept sits next to a live model.

   ↓
5. Phase 05PLANNED

   Community

   Contribution paths for engineers, students, and researchers. Public design reviews. Notes written in the open.

   ↓
6. Phase 06PLANNED

   Research Platform

   A modular twin that hosts new physics modules, external datasets, and AI-assisted analysis for real experiments.

Built in public, page by page.

The engineering journal for FusionTwin. Every decision, dead-end, and derivation gets its own note. Read them in order.

• #0002026.07.01
  Project Charter

  The foundation of the FusionTwin project.

  2026.07.01 · 2 min
  2 min →
• #0022026.07.03
  Embryo

  FusionTwin renders its first Fusion Component — a single blue sphere that proves the entire engine pipeline works end to end.

  2026.07.03 · 1 min
  1 min →
• #0032026.07.04
  Birdcage

  Even AI can make mistakes, but it's important to have a sense of humor about it. Meet the Birdcage 3000.

  2026.07.04 · 1 min
  1 min →
• #0042026.07.07
  Reactor

  FusionTwin renders its first complete reactor vessel — plasma, coils, and a sense of confinement. Next up, the divertor.

  2026.07.07 · 1 min
  1 min →
• #0052026.07.09
  The Divertor Problem

  We added a divertor to FusionTwin, modeled it wrong, and learned something useful about what a digital twin actually needs to know.

  2026.07.09 · 5 min
  5 min →
• #0062026.07.09
  Editing the Divertor

  A cleaner divertor pass in FusionTwin — tightening the geometry and preparing a cutout view so the interior actually becomes visible.

  2026.07.09 · 1 min
  1 min →

Diagrams, simulations, and reactor imagery.

A gallery that will grow with the project. Empty plates are reserved on purpose — this exhibit is meant to be added to.