The Large Hadron Collider near Geneva will be out of action for at
least two months, the European Organization for Nuclear Research (Cern)
says.

Part of the giant physics experiment was turned off for the weekend while engineers probed a magnet failure.
But a Cern spokesman said damage to the £3.6bn ($6.6bn) particle accelerator was worse than anticipated.
The LHC is built to smash protons together at huge speeds, recreating conditions moments after the Big Bang.

Scientists hope it will shed light on fundamental questions in physics.
Section damaged
On Friday, a failure, known as a quench, caused around 100 of the LHC's super-cooled magnets to heat up by as much as 100C.
The fire brigade were called out after a tonne of liquid helium leaked into the tunnel at Cern, near Geneva.
https://news.bbc.co.uk/2/hi/science/nature/7626944.stm
Cern spokesman James Gillies said on Saturday that the sector that was
damaged would have to be warmed up to above its operating temperature -
of near absolute zero - so that repairs could be made, and then cooled
down again.
While he said there was never any danger to the public, Mr Gillies admitted that the breakdown would be costly.
He said: "A full investigation is still under way but the most
likely cause seems to be a faulty electrical connection between two of
the magnets which probably melted, leading to a mechanical failure.
"We're investigating and we can't really say more than that now.
"But we do know that we will have to warm the machine up, make
the repair, cool it down, and that's what brings you to two months of
downtime for the LHC."
Setback
The first beams were fired successfully around the accelerator's 27km (16.7 miles) underground ring over a week ago.
The crucial next step is to collide those beams head on.
However, the fault appears to have ruled out any chance of these
experiments taking place for the next two months at least.
The quench occurred during final testing of the last of the LHC's electrical circuits to be commissioned.
At 1127 (0927 GMT) on Friday, the LHC's online logbook recorded a
quench in sector 3-4 of the accelerator, which lies between the Alice
and CMS detectors.
The entry stated that helium had been lost to the tunnel and that vacuum conditions had also been lost.
The superconducting magnets in the LHC must be supercooled to
1.9 kelvin above absolute zero, to allow them to steer particle beamhttps://news.bbc.co.uk/1/hi/sci/tech/7560428.stms
around the circuit.
As a result of the quench, the temperature of about 100 of the magnets in the machine's final sector rose by around 100C.
The setback came just a day after the LHC's beam was restored
after engineers replaced a faulty transformer that had hindered
progress for much of the past week.