The LHC racks up records

The LHC racks up records
This plot shows the values of the luminosity reached during the last few weeks by the LHC, with the record of 1.58x1034 cm-2s-1 achieved on Wednesday 28 June. Credit: CERN

An unprecedented number of particles has been reached in record time. Just five weeks after physics resumed, the Large Hadron Collider (LHC) is already running at full throttle. On Wednesday 28 June 2017 the LHC established yet another record-breaking high, with 2556 proton bunches circulating in each direction of the accelerator. The beams in the LHC are made up of bunches of protons, spaced seven metres (25 nanoseconds) apart, with each one containing more than 100 billion protons. 2556 is the maximum possible number of bunches that can be reached with the beam preparation method currently used.

The particle bunches that are delivered to the LHC are prepared and accelerated by a chain of four accelerators. Since last year, a new method to group and split the bunches enables the particles to be squeezed even closer together. With an equal of protons, the beam diameter was reduced by 40 per cent. Denser bunches means a higher probability of collisions at the centre of the experiments.

This success has led to a new record for the LHC of 1.58x1034 cm-2s-1. This figure may not mean much to most of us, but it's crucial for the accelerator's experts. It measures the number of potential collisions per second and per unit of area . This new peak luminosity surpasses initial expectations defined by the original designs for the LHC, which hoped it could reach a maximum of 1x1034cm-2s-1.

A higher luminosity means more collisions for the experiments collecting data: in just a few weeks ATLAS and CMS stored more than 6 inverse femtobarns, over an eighth of the total anticipated for the whole year.

Nevertheless, the operators cannot sit on their hands. Many parameters can be tuned to further improve the luminosity.

Next week, the LHC and its experiments will take a short break for the first of the two technical stops planned for the year. This will be an opportunity to carry out maintenance.

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Citation: The LHC racks up records (2017, June 30) retrieved 21 May 2019 from
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Jun 30, 2017
inverse femtobarn

Now there's an obscure unit if ever there was one

(Just for the record: I think that the 'barn' is the coolest unit name, ever, since it denotes an area which is used to calculate probability of speedy atoms hitting in "couldn't hit the broadside of a...")

Jul 02, 2017
Now there's an obscure unit if ever there was one

Obscure yes, but also amazing. To quote CERN;

"One inverse femtobarn corresponds to approximately 100 trillion proton-proton collisions"

(See http://writing-gu...emtobarn )

So the LHC recorded 6 x 10^14 collisions in "just a few weeks"!!!

Jul 02, 2017
The real question is how long would it take for the machine to create a gram of antimatter, and how many grams of this antimatter can be stored in the ITER?

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