Tags: big bang, CERN, Doomsday, Doomsday collision, Europe's CERN lab, first collisions, first collisions subatomic particles, Large Hadron Collider, LHC, subatomic particles
The first collisions between subatomic particles will take place in the giant Large Hadron Collider (LHC) next week, among fears that it might create a doomsday-like scenario for our planet.
The LHC circulates particles in a 17-mile circumference underground tunnel straddling the French-Swiss border at The European Organization for Nuclear Research, near Geneva, Switzerland, known by the acronym CERN.
According to a report in Telegraph, although there was much uproar last week about the first particles – protons – to whirl around the LHC at a shade under the speed of light, the real aim of the exercise is to bring counter rotating beams of particles into collision in the four “eyes” – detectors – of the machine to recreate conditions not seen since just after the birth of the universe.
This is the aspect of the experiment that has triggered all the angst and hand-wringing by doomsayers and Jeremiahs, who fear that the collisions will mark the end of the world, as it tumbles into the gaping maw of a black hole.
These fears have been dismissed as nonsense by Dr Evans, along with scientists such as Prof Stephen Hawking, who say that the end of the world is not nigh.
The original plan was to take 31 days from the first proton beams circulating in the LHC to smashing protons for the first time.
“We were going along at a real good lick,” Dr Evans said of the days after particles first circulated.
But, the cryogenics that keep the great machine cooled went down on Friday, as a result of thunderstorms disrupting the power supply.
“We have had problems with the electricity supply for various reasons and the cryogenics is recovering from that, so we will not have a beam again, probably until Thursday morning,” said Dr Evans.
The team now hopes to achieve collisions at between one fifth and one tenth of the full energy in a few days.
“We are very confident that we can go quite quickly. The experiments have asked us for some early collisions, at low energy. If we get stable conditions, we will get there next week,” said Dr Evans.
The collisions will take place in the two general purpose detectors of the giant machine, called Atlas and CMS, though Dr Evans added that the team will also attempt collisions in Alice, which will study a “liquid” form of matter, called a quark-gluon plasma, that formed shortly after the Big Bang, and an experiment called LHCb, which will investigate the fate of antimatter in the wake of the Big Bang.
Tags: 10 september 2008, big bang, big bang experiment, black hole, CERN, Europe's CERN lab, Large Hadron Collider, LHC, september 10 big bang
The Earth is not at risk of being sucked into a black hole, a safety report into the world’s most powerful particle physics experiment has found.
Scientists at Europe’s CERN lab plan to use the Large Hadron Collider (LHC) to smash highly-energised protons together at super-fast speeds to produce miniature versions of the Big Bang.
The collisions will create temperatures more than 100,000 times hotter than the heart of the sun.
The Large Hadron Collider straddles the French and Swiss borders. Scientists hope it will reveal what happened to particles moments after the big bang
The machine will be operated undergound in a 27km long tunnel near Geneva and detectors will trace and analyse the particles that emerge from the collisions.
Physicists hope it will help answer profound questions such as ‘What is the origin of mass?’ and ‘What is 96 per cent of the universe made up of?’
But some critics fear the collider could create microscopic black holes that could swell and end up eating the whole world.
However, the safety review from the European Organization for Nuclear Research said there was no ‘conceivable danger’ of this.
Black holes drag in matter from their surroundings. Some critics fear the collider could create a miniature black hole that could swell and swallow the Earth
Although the researchers admitted the collider will achieve energy levels no other man made technology has created before, they said natural cosmic-ray collisions had already created higher energies with no ill effects.
‘Nature has already generated on Earth as many collisions as about a million LHC experiments – and the planet still exists,’ they said.
The review panel added that astronomical black holes are much heavier than anything that could be produced in the collider.
They said even if the well-established properties of gravity were disproved and microscopic black holes were created – these particles would disintegrate immediately giving them no time to draw in outside matter.
The strange world of strangelets
The report also addressed concerns raised in 2000 that the machine could produce hypothetical particles called strangelets. These strange particles could turn nuclei in ordinary atoms into strange matter – destroying the Earth in a doomsday scenario.
In 2003, Dr Adrian Kent, from the University of Cambridge, argued that scientists had not adequately calculated the strangelets risk.
But the team led by theoretical physicist John Ellis said previous experiments had failed to produce these strangelets, and the heat produced by the collider would make their creation even less likely.
They concluded: ‘There is no basis for any concerns about the consequences of new particles or forms of matter that could possibly be produced by the LHC.’
The new document is an update of the analysis carried out in 2003 into the safety of the collider by an independent team of scientists.
The LHC was due to switch on in November 2007 but the start-up has been postponed several times. The first delay occurred after an accident in March 2007 when one of the 9,300 magnets exploded during testing and the facility was evacuated.
Further delays occurred after plaintiffs requested an injunction against the LHC’s switch-on from the United States District Court for the District of Hawaii over safety fears.
Tags: 10 september, 10 september 2008, big bang, CERN, Download, experiment, Higgs, images, laboratory, Large Hadron Collider, LHC, machine, particle physcis, science, secrets, september 2008, technology, universe, videos
Tests have cleared the way for the start-up next month of an experiment to restage a mini-version underground of the “Big Bang” which created the universe 15 billion years ago, the project chief said on Monday.
Lyn Evans of the European Organisation for Nuclear Research (CERN) said weekend trials in the vast underground LHC machine in which the particle-smashing experiment will take place over the coming months and years “went without a hitch.“
“We look forward to a resounding success when we make our first attempt to send a beam all the way round the LHC,” said Evans, who heads the multinational team of scientists that shaped the project and the machine, the Large Hadron Collider
The final tests involved pumping a single bunch of energy particles from the project’s accelerator into the 27-km (17-mile) beam pipe of the collider and steering them counter- clockwise around it for about 3 kms (2 miles).
Earlier in the month a clockwise trial in the LHC — which runs deep under French and Swiss territory between the Jura mountains and Lake Geneva — had been equally successful, CERN said.
The LHC team now plans to send a full particle beam all the way around the collider pipe in one direction on September 10 as a prelude to sending beams in both directions and smashing them together later in the year.
That collision, in which both particle clusters will be traveling at the speed of light, will be monitored on computers at CERN and laboratories around the world by scientists looking for, among other things, a particle that made life possible.
The elusive particle, which has been dubbed the Higgs Bosom after Scottish physicist Peter Higgs who first postulated nearly 50 years ago that it must exist, is thought to be the mysterious factor that holds matter together.
Recreating a “Big Bang,” which most scientists believe is the only explanation of an expanding universe, ought to show how stars and planets came together out of the primeval chaos that followed, the CERN team believes.
TIME OF EXPERIMENT – 1:30 a.m. CDT on Wednesday, Sept. 10,2008
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