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Image: ATLAS collision
ATLAS Experiment
This graphic shows a cross-section of the Large Hadron Collider's ATLAS detector with subatomic particles shooting out after a 2.36-TeV proton collision on Tuesday evening.
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updated 12/9/2009 4:09:41 PM ET 2009-12-09T21:09:41

The world's largest atom smasher has recorded its first high-energy collisions of protons, a spokeswoman said Wednesday.

Physicists hope those collisions will help them understand suspected phenomena such as dark matter, antimatter and ultimately the creation of the universe billions of years ago, which many theorize occurred as a massive explosion known as the big bang.

The collisions occurred Tuesday evening as the Large Hadron Collider underwent test runs in preparation for operations next year, said Christine Sutton of the European Organization for Nuclear Research. The organization is better known by its French acronym, CERN.

The collisions were produced by two beams of circulating particles traveling in opposite directions at 1.18 trillion electron volts, or TeV, she said. The ATLAS experiment, one of four major detectors in cathedral-sized rooms in the collider's underground tunnel at Geneva, had part of its equipment turned on and could register collisions.

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"They recorded a handful of collisions, and one of them looks quite nice, so it's on their Web site," she said.

Sutton said the collisions occurred when the machine was ramped up briefly to 1.18 TeV for each beam. That same level set a world record for proton acceleration in November, when Geneva's particle beams traveled with 20 percent more power than Fermilab's Tevatron near Chicago, which previously held the record.

Those earlier runs did not involve beam collisions, however. Tuesday's event market the first time the Tevatron's record for high-energy collisions was exceeded.

The operators plan many more collisions at lower energies so the experiments can calibrate their equipment and prepare for more advances ahead.

CERN then plans more collisions at 1.18 TeV to give all experiments the opportunity to record data at that level, but new scientific discoveries are not expected before next year when the beams are ramped up still higher, to 3.5 TeV.

That will be 3.5 times more energy that has been reached at Fermilab, previously the most powerful collider.

This report was supplemented by msnbc.com.

© 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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