The Impossible and Other-Worldly Design of the ‘Large Hadron Collider’

Situated deep inside the Jura Mountains in the Western Alps is a monstrous entity. Except it is not a monstrosity, and neither is it a monster. No, don’t worry, this is not the opening plot of a sci-fi or Monster movie; no Godzilla is hiding in there. Instead, it is a structure that is the most unique of its kind and the largest of its kind.

We are talking about the Large Hadron Collider, also known widely by its initials: LHC. The Large Hadron Collider is the world’s largest and highest-energy particle accelerator. The European Organization for Nuclear Research, CERN, constructed it over a decade between 1998 and 2008. This giant work of marvel required a collaborative effort from over 1000 scientists and more than 100 countries.

What the Large Hadron Collider does is it attempts to break down the smallest particle that exists, in order to better understand how it functions. While it’s there for a purpose, and several scientists work on it, it is the placement and functioning of the LHC that fascinates the world of design.

The Large Hadron Collider isn’t just a giant machine at work. It is also a marvel of engineering and design, one that deserves to be studied at depth.

First of, the Large Hadron Collider lies deep inside the Jura Mountains, inside a tunnel 27 kms in circumference. It is situated 175 metres beneath the France-Switzerland border near Geneva. What’s interesting about its design is that the LHC is contained inside a circular tunnel. The tunnel isn’t just 175 metres in depth throughout its entire length. It varies from 50 metres to 175 metres, and that is to reduce the amount of tunnel that lies under the Jura Mountains. This design-cum-engineering idea lets them avoid having to excavate land on the surface and to take advantage of the shielding against background radiation that the Earth’s crust provides.

The design of the tunnel is fascinating in itself. It is 3.8 metres, lined with concrete, and constructed between 1983 and 1988. It was formerly used to house the Large Electron-Positron Collider. It crosses the French-Swiss border four times, with the majority of its points falling in France. They hold ancillary equipment such as compressors, ventilation equipment, control electronics, and refrigeration plants.

Now, the collider tunnel contains two adjacent parallel beamlines, with each containing a beam. These beams travel in opposite directions around the ring, and this is where the particle collisions take place. Outside of that, there are some 1232 dipole magnets, 392 quadrupole magnets, and 10,000 superconducting magnets. Now, these magnets are heavy and made of copper-clad niobium-titanium. Hence, to keep them operating at functional temperature, about 96 tonnes of superfluid Helium-4 is needed.

This also makes the LHC the largest cryogenic facility in the world at liquid-helium temperatures. It uses around 470 tonnes of Nb-Ti superconductor.

The Large Hadron Collider isn’t just the largest particle accelerator in the world; according to the Guinness Book of World Records, it’s also the largest machine in the world. It needs a really large, high-vacuum environment so that the subatomic particles don’t interact with matter. Because if that happened, they would be annihilated and lost.

Therefore, within the LHC ring, there is a tube that is kept at a very high vacuum that the particles travel in. Subatomic particles can be accelerated in rings like the LHC, or by linear accelerators. In a linear accelerator, we accelerate the particles in a line rather than around a ring. Linear accelerators also help to get the particles up to speed before being injected into a ring. The LHC has two linear accelerators: Linac3 and Linac4. They are responsible for producing the particles and injecting them into the large LHC ring.

So, this is how the Large Hadron Collider’s design works and enables its functionality.