Frog Chorus

See also Chapter 3.6 of Smashing Physics.

Last week, on the day we got our first 7 TeV collisions at the Large Hadron Collider, quite by chance we also had the conference dinner of the annual meeting of the Institute of Physics High Energy Particle Physics and Astroparticle Physics groups. After years of financial body-blows to the fields (both principally funded by the STFC in the UK), the LHC news made it a pretty cheerful meeting in the circumstances.

The man who headed the UCL high energy physics group when I was appointed to the faculty, Tegid Jones, gave a wonderful after dinner speech. He went through the true and sometimes untold stories around the start up of several big experiments he has been involved in. These included a water-filled proton decay detector in a salt mine (IMB) which initially leaked (dissolving quite a lot of the mine and almost drowning the thesis of a future congressman), then achieved a 300m 490m siphon effect with a cesspit on the surface (bad for optical purity of the water). After the third filling, they failing to find proton decay. However, they did observe neutrinos from Supernova 1987a – still the only observation of neutrinos from outside the solar system, at least until maybe ANITA spots one. It also developed a lot of the techniques taken forward by the experiments which eventually found neutrino oscillations.

I’m lucky to have been involved in the start of two major particle physics colliders. I was a student on the ZEUS experiment, on the HERA collider in DESY, Hamburg, when it began operation.

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LHC High Energy Physics Start

See also Chapter 3.1 of Smashing Physics.

So, the LHC breaks new ground again. Not just in fundamental physics and accelerator technology, but in doing science live in public, or at least so it feels.

We had hoped for collisions for breakfast but it didn’t work out that way. The false starts reminded me of frustrating night-shifts on the ZEUS experiment in Hamburg where I did my PhD. They aren’t unusual on a new collider, but given the major accident in 2008, plus the huge public interest, it was a very nervous morning.

3.5 TeV collision

One of the first 3.5 TeV collisions in ATLAS

I guess this is how space scientists feel when launch delays happen in mid countdown. Injecting and ramping the beam energy feels like the initiation of a countdown sequence and we had to go through it three times before we finally launched the high energy physics programme of the LHC. For lunchtime. Good enough. Fantastic, in fact.

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It’s the Future, Stupid*

Today there is a letter in the Mail on Sunday from a bunch of astronomers and particle physicists backing up Suzanne Moore‘s piece last week. Her article was great (even if the juxtaposition of Carla Bruni’s rear and the now infamous Telegraph typo in my twitter stream was slightly disturbing) and the comments on it seem to show that Mail readers get the point of science better than many politicians. It’s all part of what is now a very public discussion about the importance of science, innovation and technology for future of the UK (in the context of our coming election) and indeed the world.

The MoS piece and letter bracketed a busy week which for me included the launch of the new UK Space Agency on Tuesday, a meeting of STFC’s “Particle Physics, Astronomy and Nuclear” (PPAN) Science Committee” on Wednesday and Thursday, a school governor’s meeting, then a rapid zoom to CERN and back to give a talk at an ATLAS meeting.

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Minimum Bias

[29/3/2010 An article based on this, benefiting from Ian Sample’s excellent editorial help, went on the Guardian site. See also Chapter 2.2 of Smashing Physics.]

As of Friday morning, the LHC is accelerating protons to an energy three-and-a-half times higher than the previous record. Within a couple of weeks we expect a steady stream of head-on proton-proton collisions at this energy, allowing us to search for new particles, forces and dimensions in completely new territory.

The LHC really became a collider just before Christmas. The collisions recorded back then were not at particularly high energy, but three experiments have now published results; my experiment, ATLAS, being the latest, with the paper becoming available on Tuesday. Before  storming onward, it’s a good moment to see what these results actually tell us.

The detectors (ALICE, CMS, ATLAS in this case) are basically huge digital cameras designed to record what happens when protons smash together. The first thing you do with a new collider and detector is measure the particles produced in a typical collision.

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