Particles are back in the LHC

Oct 26, 2009
The first ion beam entering point 2 of the LHC, just before the ALICE detector (23 October 2009)

During the last weekend (23-25 October) particles have once again entered the LHC after the one-year break that followed the incident of September 2008.

Friday afternoon a first beam of ions entered the clockwise beam pipe through the TI2 transfer line. The beam was successfully guided through the ALICE detector until point 3 where it was dumped. The did not travel along the whole circumference of the LHC.

During the late evening on Friday, the first beam of protons also entered the LHC clockwise ring and travelled until point 3. In the afternoon of Saturday, protons travelled from the SPS through the TI8 transfer line and the LHCb experiment, until point 7 where they were dumped.

All settings and parameters showed a perfect functioning of the machine, which is preparing for its first circulating beam in the coming weeks.

CERN is preparing the for a restart in 2009. The first circulating beam of the year is likely to be injected in mid-November. This will be followed by a short period of collisions at the injection energy of 450GeV per beam and a ramp in energy to 3.5TeV per .

Following this, LHC physics will begin with collisions at this energy. The time from first injection to first high-energy collisions will be at least four weeks. However, the complexity of scheduling coupled with inevitable glitches in a machine of this complexity could lead to this process taking longer. The first high collisions will most likely occur at a date after mid-December 2009.

Provided by CERN

Explore further: Physical constant is constant even in strong gravitational fields

add to favorites email to friend print save as pdf

Related Stories

CERN announces start-up date for Large Hadron Collider

Aug 07, 2008

CERN has today announced that the first attempt to circulate a beam in the Large Hadron Collider (LHC) will be made on 10 September. This news comes as the cool down phase of commissioning CERN's new particle ...

LHC now colder than deep space

Oct 20, 2009

(PhysOrg.com) -- The LHC (Large Hadron Collider) is once again colder than deep space as it is prepared for experiments to resume in late November.

Large Hadron Collider: VELO -- in you go!

Nov 12, 2007

One of the most fragile detectors for the Large Hadron Collider beauty (LHCb) experiment has been successfully installed in its final position. LHCb is one of four large experiments at CERN’s Large Hadron Collider (LHC), ...

The ATLAS Pixel Detector

Sep 03, 2008

With the Large Hadron Collider start-up only weeks away, SLAC researchers working on the LHC are feeling the excitement. SLAC has been involved in designing and building the ATLAS (A Toroidal LHC ApparatuS) ...

Recommended for you

How Paramecium protozoa claw their way to the top

11 hours ago

The ability to swim upwards – towards the sun and food supplies – is vital for many aquatic microorganisms. Exactly how they are able to differentiate between above and below in often murky waters is ...

User comments : 2

Adjust slider to filter visible comments by rank

Display comments: newest first

thematrix606
3.5 / 5 (6) Oct 27, 2009
Hurray! Go CERN, go! Prove for once and for all that there shall be no black hole!
frajo
3.7 / 5 (6) Oct 27, 2009
There are Black Holes. But not in the LHC.
I'm more interested in the tale of the Higgs.
Alizee
Oct 27, 2009
This comment has been removed by a moderator.
vidyunmaya
Nov 03, 2009
This comment has been removed by a moderator.