LHC: it’s not the end of the world

The world is not going to end tomorrow (September 10th) and the LHC startup does not constitute a danger to the public, contrary to claims by one or two scientists (non-physicists) that have been widely reported in the media (see here and here for example). Instead, tomorrow marks the beginning of an exciting new era in particle physics – the start of experiments at the world’s most powerful particle accelerator, the Large Hadron Collider at CERN.

Below is part of an article on the LHC that I wrote for an Irish newspaper (they may not use it, thanks to a large number of articles on the same topic by people who know little about the subject). The two main points I wanted to highlight were the safety of the experiment, and the fact that Ireland, almost uniquely among EU nations, is not a member of CERN – despite the fact that our only Nobel prize in science is in precisely this area.


September 2008 marks an important month for European science. This month, measurements begin at the new “atom-smasher” at CERN, the European Organization for Nuclear Research. Long the jewel in the crown of European science, CERN truly becomes the NASA of the sub-atomic world with the opening of its Large Hadron Collider (LHC), the world’s newest and most powerful particle accelerator.

Situated in a vast 27 km-long tunnel deep beneath the Franco-Swiss border, the new machine at CERN is probably the largest scientific experiment on planet earth. The experiments at the facility will be watched with intense interest by scientists the world over for information on the fundamental structure of matter, and on the evolution of the early universe.

How does it work? Beams of the smallest particles of matter travelling almost at the speed of light will be smashed together in head-on collision. Out of the intense energy of collision, exotic short-lived elementary constituents of matter not seen since the Big Bang will be fleetingly created and tracked in giant particle detectors.

Such experiments offer not only a glimpse of the deep structure of matter, but also of the nature of the forces that hold it together. For example, evidence of the existence of the elusive Higgs boson or ‘God particle’ could offer support for the so-called Standard Model of particle physics, confirming that our view of the origin of mass is correct. Glimpses of exotic entities such as ‘supersymmetric’ particles could reveal deep connections between all the fundamental forces of nature. Other experiments might reveal the true nature of space and time.

Cosmologists hope that the experiments at CERN might offer insight into the formation of the early universe, as the giant collider will achieve energies not seen since the Big Bang. In particular, a glimpse of certain particles could shed light on the nature of Dark Matter, one of the great puzzles of the universe at large.

Is the LHC safe? This question has recently received much attention in the world’s media. In fact, the accelerator is simply a more powerful version of previous machines and constitutes no danger to the public. Rumours that it could create a giant earth-eating black hole arise from a misunderstanding of the physics of black holes (although there is an intriguing possibility that harmless mini-black holes could be created in the experiment).

The 27km tunnel at CERN: experiments will not destroy the earth

Such research into the realm of the sub-atomic might seem of dubious practical application in today’s world. However, the technical spin-offs of experiments at facilities such as CERN are legendary. In 1990, the world wide web was created by CERN physicist Tim Berners-Lee in order to provide a platform for scientists to share and analyse experimental data. Accelerator technology developed at CERN is now routinely used in important medical applications. Most recently, CERN scientists have pioneered the use of GRID computing, a new type of computing that involves the networking of thousands of computers, in order to facilitate the analysis of vast amounts of data that will be collected at the LHC.

CERN is regularly cited as an outstanding example of European collaboration. Created in the 1950s to counter the brain-drain of European scientists to the U.S., it now provides a world-class facility for the scientists of over 20 European nations, while a host of non-European nations such as China Japan, India, the U.S. and Russia all enjoy associate membership. In fact, there are more American particle physicists working at CERN today than in the U.S.

Europe has reason to be proud, but Ireland has not. The participation of Irish scientists in the historic experiments will be severely limited by the fact that the Republic, almost uniquely among EU nations, is not a member of CERN. This omission has decimated Irish research in experimental particle physics, one of the most fundamental fields of the sciences (with the honourable exception of one group at UCD). It has also rendered it almost impossible for Irish engineers and scientists to bid for the large international contracts in high-tech software and hardware projects, a fact that sits awkwardly with our efforts to become a world leader in science and technology.

Strangest of all, Ireland has a proud tradition in this field of science. In 1932, the Irish scientist Ernest Walton and his Cambridge colleague John Cockcroft built the world’s first particle accelerator and used it to split the atomic nucleus, an achievement for which they were awarded the Nobel prize. This work opened up the field of sub-atomic physics, and a version of their machine is used today as a preliminary accelerator in the new facility at CERN.
One wonders what Walton would have made of the Irish absence at CERN at this historic time…


P.S. Just about every physicist with a blog is writing about the CERN experiments this week, there is a good list of blogs on the topic on the particle physics website interactions.org

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Filed under CERN, Particle physics

10 responses to “LHC: it’s not the end of the world

  1. Gosh, it’s just a big atom smasher, and the possibility of something dangerous to happen is too small for that something to happen ;) If it would have been real risk, scientists would inform us, or take measures against it, or, after all, never would have thought of taking this idea to reality. So stop worrying, listen to common sense and do not let this rumor by fools take over your mind.

  2. Amy

    hello, I’m an A-level student from london studying biology.

    firstly i want to thank you for confirming the world is not going to blow up(my younger siblings were completely convinced!). And i would like you to thank me for giving me insight into this subject which i find fascinating. If you are familiar with the book ‘Angels and Demons’ by Dan Brown then you can understand my surprise at the mention of antimatter in the media! If you have not read it i recommend it!

    thank you for your time

  3. cormac

    Hi Amy, yes, I’ve read it, I too am a closet Dan Brown fan. I particularly like the passage where the CERN scientist explains how they know a thing or two about finding addresses from the web (ve hav ways if finding you ja…).
    Actually antimatter has been around for a while (first detected in 1952) – the real surprise is that there isn’t more of it, i.e. we generally we have to make it in the lab. One of the great mysteries in cosmology is why practically all the AM in the universe disappeared after the Big Bang, but ordinary matter survived (not to be confused with Dark Matter, which is ordinary matter that we just can’t see except by its gravitational field).
    Come to think of it, I must do a post on antimatter, given the title of the blog!

  4. cormac

    well said votetheday

  5. DB

    Cern have a FAQ about Angels and Demons here:


    Summary: No antimatter bombs from CERN this century.

  6. Jess

    I’m no scientist but, I know everything is based on theories so no one really knows what will happen, so why risk it? Is this research worth possibly ending the world, or destroying a large part of it? This experiment is being done in a 17 mile radius facility. What will happen if it escapes the tubes or the explosion is so large it blows the LHC apart? WHAT WILL HAPPEN THEN to the atmosphere or our food supplies? No one knows what will happen until it HAPPENS! They might get answer’s they really don’t want to know or open the secrets that can’t be closed! I don’t think it’s worth the risk!

  7. cormac

    In fact, the technology is tried and tested, simply one step up from the last accelerator. When scientists say they don’t know what will happen, what they mean is that they don’t know which particles will be found – this is why the experiment is being done, to decide which mathematicial theory points in the right direction.
    There really is no danger of black holes, explosions etc – for example, cosmic rays collide with the atmosphere with high energy all the time, with no discernable result…

  8. Qays M A

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  9. the novel of Dan Brown are all great works, i specially love Angels and Demons .

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