# FUSION / a star, in a bottle

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Category: Future
Slides: 13
Updated: 2026-05-17T20:55:58.882Z
Tags: catalog, future, fusion

## Summary

13 SLIDES · THE SCIENCE · THE PROJECTS · THE TIMELINE Key sections include: FUSION a star, in a bottle; 02 The basic reaction; 03 Why it’s hard; 04 Fission ≠ fusion; 05 Magnetic confinement · tokamaks; 06 Inertial confinement · lasers; 07 The private wave; 08 The magnet breakthrough; 09 What “Q” actually means; 10 The hard yards to a power plant.

## Slide Outline

1. FUSION a star, in a bottle
2. 02 The basic reaction
3. 03 Why it’s hard
4. 04 Fission ≠ fusion
5. 05 Magnetic confinement · tokamaks
6. 06 Inertial confinement · lasers
7. 07 The private wave
8. 08 The magnet breakthrough
9. 09 What “Q” actually means
10. 10 The hard yards to a power plant
11. 11 An honest timeline
12. 12 Why it matters
13. Where to keep going

## Slide Transcript

### Slide 1: FUSION
 a star, in a bottle

- Lecture 01 · Plasma Physics
- 13 SLIDES · THE SCIENCE · THE PROJECTS · THE TIMELINE

### Slide 2: 02The basic reaction

- Pressed close enough together, light nuclei fuse — the strong force snaps them into a heavier nucleus, and the mass deficit becomes kinetic energy. The easiest reaction we know:
- D + T → ⁴He (3.5 MeV) + n (14.1 MeV) + 17.6 MeV
- Deuterium
- ¹H + 1n · abundant in seawater, ~33 g/m³
- Tritium
- ¹H + 2n · radioactive, t½ ≈ 12.3 yr · must be bred
- Energy
- 17.6 MeV per fusion · ~4×10⁸ J / g of fuel
- For comparison: 1 g of D-T fuel ≈ 8 tonnes of oil equivalent.

### Slide 3: 03Why it’s hard

- Two positive nuclei repel via the Coulomb force. To get them close enough for the strong force to take over, you have to fling them at each other — thermally.
- Plasma temperature
- 108 K
- More than 6× hotter than the core of the Sun. The Sun cheats by being absurdly massive (gravity does the confining); we don’t have that option.
- Lawson’s triple product
- n · T · τ ≥ 3×10²¹
- density × temperature × confinement time
- (keV · s · m⁻³)
- You can trade among the three. Tokamaks run hot & long; inertial schemes run hot & dense for nanoseconds.
- No solid material survives contact with a 100-million-degree plasma. The plasma must be held away from every wall — by magnetic fields, by inertia, or both.

### Slide 4: 04Fission ≠ fusion

- They are different reactions with very different consequences. The marketing conflation costs fusion politically.
- FissionFusion
- Reaction²³⁵U + n → fragmentsD + T → ⁴He + n
- Fueluranium / plutoniumhydrogen isotopes
- Energy / kg fuel~8×10¹³ J~3.4×10¹⁴ J
- Long-lived waste10⁵-yr actinidesnone from the reaction itself
- Runaway riskchain reaction; needs controlplasma quenches if disturbed
- Weaponizable byproductplutoniumtritium (limited; not a bomb fuel)
- Fusion does produce activated structural materials from neutron flux — a real engineering problem, but on decade half-lives, not millennia.

### Slide 5: 05Magnetic confinement · tokamaks

- Charged particles spiral along magnetic field lines. Bend the lines into a closed torus and the plasma stays trapped — in principle, forever.
- Toroidal field — coils ring the donut, the dominant field.
- Poloidal field — induced by plasma current itself, prevents drift.
- ITER (France, first plasma slipped to ~2034) is a ~6.2 m major-radius tokamak built by 35 nations. Goal: Q ≥ 10.
- The word tokamak is Russian shorthand for “toroidal chamber with magnetic coils.”

### Slide 6: 06Inertial confinement · lasers

- Don’t hold the plasma — crush it. A peppercorn-sized capsule of D-T is hit symmetrically by a converging shock; for a few hundred picoseconds the fuel is denser than lead and hotter than the Sun’s core. By the time it blows apart, the reaction has run.
- NIF · Lawrence Livermore
- December 5, 2022
- 192 lasers delivered 2.05 MJ to a capsule. The fusion reaction released 3.15 MJ. First net energy gain in a controlled fusion experiment in human history.
- target gain
- Q = 1.54
- The pellet
- ~2 mm diameter, frozen D-T layer inside a diamond shell, suspended in a gold cylinder (hohlraum) that converts laser light to a uniform X-ray bath.
- A working power plant would need to do this ~10 times per second, every second, for years. NIF currently fires a few shots a day.

### Slide 7: 07The private wave

- For 60 years fusion meant national labs and ITER. Since ~2018, $7+ billion of private capital has flowed into ~40 startups, each betting on a different shortcut.
- Commonwealth Fusion · SPARC
- MIT spinout. Compact tokamak using high-temperature superconducting (HTS) tape. Targets Q > 2 in 2027. Sited in Devens, MA.
- Helion
- Pulsed field-reversed configuration. Burns D-³He. Direct electric conversion (no steam). Microsoft signed a 50 MW PPA for 2028 — aggressive.
- TAE Technologies
- Aneutronic p-¹¹B fuel. Hardest fuel cycle (needs ~10⁹ K) but cleanest output. Backed by Google.
- General Fusion
- Magnetized target fusion: pistons crash a liquid lithium liner around a plasma. Building demo in Oxford, UK.
- Tokamak Energy
- UK firm. Compact spherical tokamaks + HTS magnets. Reached 100 M K in ST40 (2022).
- The bet
- That faster iteration + new magnet tech beats one giant 30-year intergovernmental megaproject. Verdict pending.

### Slide 8: 08The magnet breakthrough

- Tokamak performance scales steeply with magnetic field strength — roughly as B⁴. Doubling B shrinks the machine by ~16× for the same fusion power.
- Old: NbTi / Nb₃Sn
- ~5–6 T · cooled to 4 K with liquid helium · brittle, expensive
- New: REBCO HTS tape
- 20+ T · works at 20 K · thin, robust, manufacturable
- Consequence
- ITER-class performance in a building you can fit on a campus. This is why SPARC, Tokamak Energy, and others suddenly look credible.
- CFS’s 2021 demonstration of a 20 T HTS toroidal-field coil at full scale was the moment serious people stopped dismissing private fusion. It happened. The magnet works.

### Slide 9: 09What “Q” actually means

- Headlines say “NIF achieved net energy.” True — but only in a specific, narrow sense. Three different Qs matter:
- WhatDefinitionNIF Dec ’22
- Qscientific (target gain)
- fusion energy out / laser energy on target
- 1.54
- Qengineering
- fusion energy out / total wall-plug electricity in
- ~0.01
- Qcommercial
- net electricity out / wall-plug in, after capture losses
- NIF’s lasers drew about 300 MJ from the wall to deposit 2 MJ on target. So to get from a scientific milestone to a power plant we still need ~50–100× more. It is not a small gap. It is a real gap. Both things are true.

### Slide 10: 10The hard yards to a power plant

- Beyond ignition, four engineering problems must be solved simultaneously:
- 1 · Tritium breeding
- World tritium stockpile is ~25 kg. A 1 GW plant burns ~56 kg/year. Plants must breed their own tritium from a lithium blanket struck by fusion neutrons. Required ratio > 1.0; nobody has demonstrated this in a real machine yet.
- 2 · Materials
- 14 MeV neutrons embrittle steel and create activation. First-wall tiles facing the plasma erode. New alloys (RAFM steels, tungsten) must survive ~150 dpa of damage over a plant lifetime.
- 3 · Duty cycle
- NIF: a few shots a day. ITER: 400 s pulses, then cool down. A plant needs months of continuous operation. Every component must work for that.
- 4 · Economics
- Even if it works, capital cost per kW must compete with solar+storage and fission. The unit economics are unproven; the regulatory path doesn’t exist yet.

### Slide 11: 11An honest timeline

- The old joke — “fusion is 30 years away, and always will be” — has been roughly right since the 1950s. Here’s where reasonable people now disagree:
- 2025NOW
- 2027SPARC Q>2
- 2030sOPTIMISTS
- 2034ITER 1ST PLASMA
- 2040sCONSENSUS
- 2050+SCALE
- Optimists (2030s)
- HTS magnets + private capital + iteration. Helion, CFS, Tokamak Energy all guide to a demo plant by ~2030 and pilot grid power by mid-decade.
- Consensus (2040s)
- ITER scientific results late 2030s → DEMO designs → first commercial plant ~2045. The IAEA roadmap. The boring answer.
- Skeptics (never)
- Tritium breeding may not close. Materials may not survive 30 years. By then, solar + batteries + advanced fission may have eaten the niche.

### Slide 12: 12Why it matters

- If fusion works at scale, it is the closest thing physics offers to a generic energy abundance:
- Clean — no CO₂, no long-lived waste, no proliferation pathway.
- Baseload — runs continuously, independent of weather. Solves the awkward 20% of the grid that solar+storage strains to cover.
- Sited anywhere — fuel is hydrogen from water. No mining, no pipelines, no geopolitics of supply.
- Dense — a single GW plant on a few hectares. No square kilometres of panels, no ridge-line wind farms.
- Cheap, clean, abundant electricity is the upstream input to nearly every problem we want to solve — desalination, direct air capture, fertiliser, heat for industry, AI compute. It is not a niche fix. It is a civilisation-scale lever, if we can build it.
- It is also not guaranteed, not soon, and not a reason to slow anything else down. Build solar. Build fission. Build fusion. All of them.

### Slide 13: Where to keep going

- further reading
- Video — first principles
- YouTube · “fusion energy explained”
- Kurzgesagt, Real Engineering, Sabine Hossenfelder, and Veritasium all have solid intro tracks.
- Video — NIF ignition
- YouTube · “NIF ignition breakthrough”
- LLNL’s own announcement, plus deep-dives on what gain Q=1.5 actually buys.
- Books
- The Fairy Tale of Nuclear Fusion — L. J. Reinders
- Sun in a Bottle — Charles Seife
- The Star Builders — Arthur Turrell
- Track the field
- Fusion Industry Association annual report
- ITER organization news
- arXiv physics.plasm-ph
- ⟡ END · 13 / 13 ⟡


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