Why physics needs such enormous machines to study the smallest things
October 6, 2026 · 13 min read
Harry Cliff explains why a collider has to be so big, Don Lincoln explains how colliders and detectors work, and Lisa Randall draws lessons from the Large Hadron Collider. Their explanations answer the common question of why progress in particle physics costs so much.
The rules, numbers and steps worth keeping in front of you.
- Randall: higher energy resolves shorter distances.
- Energy becomes mass; a particle can be made only if the collision carries at least its mass.
- Cliff: the collider is a microscope for quantum fields, which must be hit hard to ripple.
- A ring reuses its accelerator; protons get a kick on every lap.
- Steering is the limit: for a given magnet strength, more energy means a wider ring.
- Bunches mostly miss, so there are 40 million crossings and about a billion collisions a second.
- Lincoln: most collisions are boring; the task is picking out the ones nobody has seen.
- Triggers cut 40 million snapshots a second to about 1,000 kept for study.
- Detectors are huge: Lincoln's weighs 14,000 tons and stands five storeys tall.
- Cliff: the collider cost about 10 to 12 billion euros and took decades to approve.
- Lincoln: collider energy grows about sevenfold every twenty years.
- Cliff: testing string theory would take an accelerator circling the Milky Way.
- Randall: the Higgs was a victory; supersymmetry's absence is a cautionary tale.
- Precision measurement, underground detectors and neutrino beams are other routes to new physics.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.