Featured Research

from universities, journals, and other organizations

Two circulating beams bring first collisions in Large Hadron Collider

Date:
November 23, 2009
Source:
CERN
Summary:
The Large Hadron Collider -- the world's most powerful particle accelerator -- circulated two beams simultaneously for the first time on Nov. 23, allowing the operators to test the synchronization of the beams and giving the experiments their first chance to look for proton-proton collisions.

ALICE event.
Credit: Image courtesy of CERN

The Large Hadron Collider (LHC) circulated two beams simultaneously for the first time on Nov. 23, allowing the operators to test the synchronization of the beams and giving the experiments their first chance to look for proton-proton collisions.

Related Articles


With just one bunch of particles circulating in each direction, the beams can be made to cross in up to two places in the ring. From early in the afternoon, the beams were made to cross at points 1 and 5, home to the ATLAS and CMS detectors, both of which were on the look out for collisions. Later, beams crossed at points 2 and 8, ALICE and LHCb.

"It's a great achievement to have come this far in so short a time," said CERN Director General Rolf Heuer. "But we need to keep a sense of perspective -- there's still much to do before we can start the LHC physics programme."

Beams were first tuned to produce collisions in the ATLAS detector, which recorded its first candidate for collisions at 14:22 this afternoon. Later, the beams were optimised for CMS. In the evening, ALICE had the first optimization, followed by LHCb.

"This is great news, the start of a fantastic era of physics and hopefully discoveries after 20 years' work by the international community to build a machine and detectors of unprecedented complexity and performance," said ATLAS spokesperson, Fabiola Gianotti.

"The events so far mark the start of the second half of this incredible voyage of discovery of the secrets of nature," said CMS spokesperson Tejinder Virdee.

"It was standing room only in the ALICE control room and cheers erupted with the first collisions" said ALICE spokesperson Jurgen Schukraft. "This is simply tremendous."

"The tracks we're seeing are beautiful," said LHCb spokesperson Andrei Golutvin, "we're all ready for serious data taking in a few days time."

These developments come just three days after the LHC restart, demonstrating the excellent performance of the beam control system. Since the start-up, the operators have been circulating beams around the ring alternately in one direction and then the other at the injection energy of 450 GeV. The beam lifetime has gradually been increased to 10 hours, and today beams have been circulating simultaneously in both directions, still at the injection energy.

Next on the schedule is an intense commissioning phase aimed at increasing the beam intensity and accelerating the beams. All being well, by Christmas, the LHC should reach 1.2 TeV per beam, and have provided good quantities of collision data for the experiments' calibrations.

CERN, the European Organization for Nuclear Research, is the world's leading laboratory for particle physics. It has its headquarters in Geneva. At present, its Member States are Austria, Belgium, Bulgaria, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. India, Israel, Japan, the Russian Federation, the United States of America, Turkey, the European Commission and UNESCO have Observer status.


Story Source:

The above story is based on materials provided by CERN. Note: Materials may be edited for content and length.


Cite This Page:

CERN. "Two circulating beams bring first collisions in Large Hadron Collider." ScienceDaily. ScienceDaily, 23 November 2009. <www.sciencedaily.com/releases/2009/11/091123193606.htm>.
CERN. (2009, November 23). Two circulating beams bring first collisions in Large Hadron Collider. ScienceDaily. Retrieved March 1, 2015 from www.sciencedaily.com/releases/2009/11/091123193606.htm
CERN. "Two circulating beams bring first collisions in Large Hadron Collider." ScienceDaily. www.sciencedaily.com/releases/2009/11/091123193606.htm (accessed March 1, 2015).

Share This


More From ScienceDaily



More Space & Time News

Sunday, March 1, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Black Hole 12 Billion Times the Size of Sun Discovered at Dawn of Universe

Black Hole 12 Billion Times the Size of Sun Discovered at Dawn of Universe

Buzz60 (Feb. 26, 2015) Scientists are saying they&apos;ve spotted a black hole 12 billion time bigger than the sun. Patrick Jones (@Patrick_E_Jones) has the details. Video provided by Buzz60
Powered by NewsLook.com
NASA's Dawn Spacecraft Spots Two Bright Points On Ceres

NASA's Dawn Spacecraft Spots Two Bright Points On Ceres

Newsy (Feb. 26, 2015) NASA scientists still don&apos;t have a clear picture of the bright spots showing up on the surface of Ceres, a minor planet in the asteroid belt. Video provided by Newsy
Powered by NewsLook.com
Astronauts Rig Station for New U.S. Space Taxis

Astronauts Rig Station for New U.S. Space Taxis

Reuters - News Video Online (Feb. 25, 2015) U.S. astronauts float outside the International Space Station to rig parking spots for two commercial space taxis. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Water Leaks Into Astronaut's Helmet

Water Leaks Into Astronaut's Helmet

Reuters - US Online Video (Feb. 25, 2015) A dramatic finish to a spacewalk as NASA astronaut Terry Virts&apos; helmet pools with water. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins