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TED2009

Brian Cox: What went wrong at the LHC

Filmed:

In this short talk from TED U 2009, Brian Cox shares what's new with the CERN supercollider. He covers the repairs now underway and what the future holds for the largest science experiment ever attempted.

- Physicist
Physicist Brian Cox has two jobs: working with the Large Hadron Collider at CERN, and explaining big science to the general public. He's a professor at the University of Manchester. Full bio

Last year at TED I gave an introduction to the LHC.
00:12
And I promised to come back and give you an update
00:16
on how that machine worked.
00:18
So this is it. And for those of you that weren't there,
00:20
the LHC is the largest scientific experiment ever attempted --
00:22
27 kilometers in circumference.
00:25
Its job is to recreate the conditions
00:27
that were present less than a billionth of a second after the universe began,
00:29
up to 600 million times a second.
00:32
It's nothing if not ambitious.
00:35
This is the machine below Geneva.
00:37
We take the pictures of those mini-Big Bangs inside detectors.
00:39
This is the one I work on. It's called the ATLAS detector --
00:42
44 meters wide, 22 meters in diameter.
00:45
Spectacular picture here of ATLAS under construction
00:48
so you can see the scale.
00:51
On the 10th of September last year we turned the machine on for the first time.
00:53
And this picture was taken by ATLAS.
00:56
It caused immense celebration in the control room.
00:59
It's a picture of the first beam particle
01:02
going all the way around the LHC,
01:04
colliding with a piece of the LHC deliberately,
01:06
and showering particles into the detector.
01:09
In other words, when we saw that picture on September 10th
01:11
we knew the machine worked,
01:13
which is a great triumph.
01:15
I don't know whether this got the biggest cheer,
01:17
or this, when someone went onto Google
01:19
and saw the front page was like that.
01:21
It means we made cultural impact
01:23
as well as scientific impact.
01:25
About a week later we had a problem with the machine,
01:27
related actually to these bits of wire here -- these gold wires.
01:30
Those wires carry 13 thousand amps
01:34
when the machine is working in full power.
01:37
Now the engineers amongst you will look at them and say,
01:39
"No they don't. They're small wires."
01:41
They can do that because
01:43
when they are very cold they are what's called superconducting wire.
01:45
So at minus 271 degrees,
01:47
colder than the space between the stars,
01:50
those wires can take that current.
01:52
In one of the joints between over 9,000 magnets in LHC,
01:54
there was a manufacturing defect.
01:58
So the wire heated up slightly,
02:00
and its 13,000 amps suddenly encountered electrical resistance.
02:02
This was the result.
02:06
Now that's more impressive
02:08
when you consider those magnets weigh over 20 tons,
02:11
and they moved about a foot.
02:13
So we damaged about 50 of the magnets.
02:15
We had to take them out, which we did.
02:18
We reconditioned them all, fixed them.
02:21
They're all on their way back underground now.
02:23
By the end of March the LHC will be intact again.
02:25
We will switch it on,
02:27
and we expect to take data in June or July,
02:29
and continue with our quest to find out
02:32
what the building blocks of the universe are.
02:35
Now of course, in a way
02:37
those accidents reignite the debate
02:40
about the value of science and engineering at the edge. It's easy to refute.
02:42
I think that the fact that it's so difficult,
02:48
the fact that we're overreaching, is the value of things like the LHC.
02:50
I will leave the final word to an English scientist, Humphrey Davy,
02:54
who, I suspect,
02:58
when defending his protege's useless experiments --
03:00
his protege was Michael Faraday --
03:03
said this, "Nothing is so dangerous
03:05
to the progress of the human mind
03:08
than to assume that our views of science are ultimate,
03:10
that there are no mysteries in nature,
03:14
that our triumphs are complete, and that
03:16
there are no new worlds to conquer."
03:18
Thank you.
03:20
(Applause)
03:22

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About the Speaker:

Brian Cox - Physicist
Physicist Brian Cox has two jobs: working with the Large Hadron Collider at CERN, and explaining big science to the general public. He's a professor at the University of Manchester.

Why you should listen

Based at the University of Manchester, Brian Cox works at CERN in Geneva on the ATLAS experiment, studying the forward proton detectors for the Large Hadron Collider there. He's a professor at the University of Manchester, working in the High Energy Physics group, and is a research fellow of the Royal Society.

He's also become a vital voice in the UK media for explaining physics to the public. With his rockstar hair and accessible charm, he's the go-to physicist for explaining heady concepts on British TV and radio. (If you're in the UK, watch him on The Big Bang Machine.) He was the science advisor for the 2007 film Sunshine. He answers science questions every Friday on BBC6 radio's Breakfast Show.

More profile about the speaker
Brian Cox | Speaker | TED.com