Despite false starts and warm ups, the LHC, a project that began
more than 20 years ago, has finally begun to take and analyse data and the
champagne is flowing in celebration.
The experiments in the more than £6 billion project, based
at the European Laboratory for Particle Physics, CERN, saw collisions at a
record energy of 7 tera electron volts (TeV) at 1pm today. In a “gentlemen’s
draw” all four experiments appeared to see the particles smashing together and
flying out into the detectors at the same time, as the magnets brought the
beams together to collide.
Physicists were primed for action from 4am this morning, but
the sensitive safety systems, installed in the wake of the machine’s breakdown
in 2008, twice aborted the attempt and reset the system before collisions could
get underway.
But finally, the moment of truth came on the third attempt.
It was communicated to the untrained eye only through the huge cheers erupting
from the various control rooms and collaborators across the world, all linked
up by webcam. But by 10 minutes later the first visual displays of colliding
particles emerged, showing spaghetti strings of flying particles, tracked
within 3D images of the detectors.
CERN researchers are still walking around holding laptops
showing such displays and cradling them like newborn babies. The director
general of CERN has even been beamed in via videoconference from Japan where he
says he is eating an evening meal of crisps and wine, proudly displaying a now
empty bottle of 1991 vintage red, the year the LHC got its first official go
ahead.
But as the head of the CMS experiment, Guido Tonelli, said
in the CMS control room just a few moments ago, the celebrations will be quick
because what they are marking is that operation is now underway and it’s time
for the experiments to get on with what they were designed to do.
There are now around 50 collisions happening per second
within the detectors. At seven times the energy of its nearest competitor - the
Tevatron at Fermilab in
The LHC will now run until it gathers one inverse femtobarn
(a measurement of the number of particle collisions) and beats that record.
This is foreseen for the end of 2011, when the machine will be shutdown for a
year of upgrades before, more than likely, we’ll be back to do this all over
again at the optimum energy of 14 TeV.
