Mean Free Path
Notes from the Edge
Mean Free Path is a working notebook on vacuum: the physics, the machines, and the people who run them. It maps how ultra-high vacuum ties together industrial electron tubes, particle accelerators and light sources, fusion, quantum hardware, semiconductor fabrication, and the space environment. Old problems in new clothes, written from inside the work.
Physical understanding is a fragile asset. Most organizations destroy it by accident.
Essays, field notes, and working tools on vacuum and the physics of the frontier. Written from inside the work, not above it.
Two industries are now hitting the wall vacuum people hit decades ago. Fusion needs first walls and cryostats that do not poison themselves with their own outgassing. Quantum needs cold, clean assemblies that hold. Old problems, new clothes. If that is your wall, start here.
What industry already learned
The failure modes a tube factory met decades ago, set beside the fusion and quantum teams about to meet them again.
Read the notes → ActorsWho runs ultra-high vacuum
The labs and companies pushing vacuum to its edge, and the exact problem each one is up against.
See the map → The ScaleOne ruler, fifteen decades
Every vacuum problem on a single axis, from a bench desiccator down to where only accelerators have a reason to live.
Climb the ladder →Essays
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The Names Nobody Cites
The cited names build the chips. The names nobody cites hold the vacuum.
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No Dashboard Pumps Faster
A dashboard is not an oracle. It is a memory.
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Tight Enough
Hermetic is not a number. It is a network held below its threshold.
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The Better Ceramic
What a material costs once it leaves the datasheet.
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The Arc
The one failure a tube, an accelerator, and a fusion magnet all share, and the craft that keeps it away.
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Everything Outgasses
A law that does not care whether you are building an X-ray tube, an accelerator, or a star.