Catatan dari lapangan: Berita ini langsung dan masih segar dari kantor Humas
CERN. Staf dan teknisi CERN memulai tugas untuk menghidupkan kembali LHC Jum'at
pukul 17:00 waktu Jenewa. Mereka berhasil mengendalikan berkas partikel
mengelilingi LHC antara pukul 20:00-22:00, baik untuk arah putaran searah jarum
jam maupun berlawanan jarum jam. Kru BBC saat ini ada di lapangan, dan BBC
menjadi media pertama yang memberitakan peristiwa ini.

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The LHC is back

Geneva, 20 November 2009. Particle beams are once again circulating in the
world's most powerful particle accelerator, CERN1's Large Hadron Collider (LHC).
This news comes after the machine was handed over for operation on Wednesday
morning. A clockwise circulating beam was established at ten o'clock this
evening. This is an important milestone on the road towards first physics at the
LHC, expected in 2010.

"It's great to see beam circulating in the LHC again," said CERN Director
General Rolf Heuer. "We've still got some way to go before physics can begin,
but with this milestone we're well on the way."

The LHC circulated its first beams on 10 September 2008, but suffered a serious
malfunction nine days later. A failure in an electrical connection led to
serious damage, and CERN has spent over a year repairing and consolidating the
machine to ensure that such an incident cannot happen again.

"The LHC is a far better understood machine than it was a year ago," said CERN's
Director for Accelerators, Steve Myers. "We've learned from our experience, and
engineered the technology that allows us to move on. That's how progress is
made."

Recommissioning the LHC began in the summer, and successive milestones have
regularly been passed since then. The LHC reached its operating temperature of
1.9 Kelvin, or about -271 Celsius, on 8 October. Particles were injected on 23
October, but not circulated. A beam was steered through three octants of the
machine on 7 November, and circulating beams have now been re-established. The
next important milestone will be low-energy collisions, expected in about a week
from now. These will give the experimental collaborations their first collision
data, enabling important calibration work to be carried out. This is
significant, since up to now, all the data they have recorded comes from cosmic
rays. Ramping the beams to high energy will follow in preparation for collisions
at 7 TeV (3.5 TeV per beam) next year.

Particle physics is a global endeavour, and CERN has received support from
around the world in getting the LHC up and running again.

"It's been a herculean effort to get to where we are today," said Myers. "I'd
like to thank all those who have taken part, from CERN and from our partner
institutions around the world."

A press conference will be held at CERN, at the Globe of Science and Innovation,
at 2pm on Monday 23 November, and webcast at: http://webcast.cern.ch/. Submit
your questions to @CERN via Twitter. We cannot guarantee that all questions will
be answered.

Follow LHC progress on twitter at www.twitter.com/cern
For photos, video and latest information see:
http://press.web.cern.ch/press/lhc-first-physics/
Contact : http://press.web.cern.ch/press/ContactUs.html



1. 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.