LHC's 'Heart' Starts Pumping Protons Before Restart 50
astroengine writes: While on its long road to restart, yet another milestone was reached at the Large Hadron Collider (LHC) over the weekend. Protons were generated by the LHC's source and blasted through a "daisy-chain" of smaller accelerators before being intentionally smashed into a metaphorical brick wall. The particle beam didn't reach the LHC's famous 17-mile (27-kilometer) accelerator ring — they were stopped just short — but the event was used to begin calibration efforts of the massive experiment's detectors before the whole system is powered back up again early next year. "These initial tests are a milestone for the whole accelerator chain," said the LHC's chief engineer, Reyes Alemany Fernandez. "Not only was this the first time the injection lines have seen beams in over a year, it was also our first opportunity to test the LHC's operation system. We successfully commissioned the LHC's injection and ejection magnets, all without beam in the machine itself."
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This is 'merica. In 'Merica, we don't accelerate protons around a track. We accelerate the track around the protons.
This just takes Texas-sized amounts of time.
Re:Heart starts pumping.. (Score:4, Informative)
I know, right. Also, can we get some Americans in charge of that thing?
Are there Americans under the age of about 35 who have studied enough physics to even know what a particle collider is?
Or you meant put American immigrants in charge of the big toy.
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I happen to be an American, under 35, with a degree in physics, who occasionally works at particle collider facilities. The average state of scienctific literacy might not be fantastic here, but there's no denying that many of the best minds in physics today are from the U.S.
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there's no denying that many of the best minds in physics today are from the U.S.
Maybe so but it is approaching midnight on that day and things will change soon.
Re:Heart starts pumping.. (Score:4, Insightful)
In a lot of cases that's what science is - a lot of hard work over a long time for a few hours of experiments.
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So stop being a nationalistic douchebag. But who am I kidding, I'm responding to an AC here.
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It's alive! [youtube.com]
Hawking radiation (Score:2)
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All the diagrams I've seen are from the perspective of an observer falling into a static black hole, with the mass concentrated as a singularity in the centre. For the outside observer, it takes infinite time for something falling in to cross the event horizon.
So suppose black holes actually do evaporate. An infalling observer could find the event horizon retreating from him as the hole shrank.
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So suppose black holes actually do evaporate. An infalling observer could find the event horizon retreating from him as the hole shrank.
Not unless that black hole evaporates on the timescale of a a few seconds, as seen by a far away observer. Look up a Eddington-Finkelstein diagram, where you have clear indication of light rays from infinity coming in, and can be thought of as regular pulses from a distant clock. The infalling observer still reaches the center on a very short timescale compared to both the the outside and their own clock. To find away for the infalling observer to miss the event horizon of a stellar sized or larger black
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Much less than that unless you can collapse the mass of a small moon into a black hole.
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I'm not a physicist, so if I've made a mistake I hope someone can point it out.
Eddington-Finkelstein coordinates reparameterise the Swartzchild coordinates (t,r,thea,phi) with (v,r,thea,phi) where v = t + r* and r* = r + 2M log(r/2M -1). Note that r* -> -infinity as r->2M so as r->2M v -> t + infinity. For an outside observer, the ticks of a clock at the event horizon are infinitely far apart. Similarly, dt/dr -> infinity as r->2M.
From another perspective, for an outside observer we're
Dry firing (Score:1)
Missing the real news here (Score:4, Insightful)
before being intentionally smashed into a metaphorical brick wall.
Surely the real news here is that they've been able to make functional use of abstract concepts.
Next they'll announce that they've slashed the electricity bill by powering the magnets with love.
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The article could have told us what the protons were actually smashed into, instead...
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No, the real news here as far as /. is concerned is that pretty much every knowledgeable user is gone.
These stories used to take off and have comments that genuinely added to the article by actual scientists and sometimes even people working on the project. Now they struggle to get 50 comments where half are trolls, 1/4 are weak jokes, 1/8 are armchair physicists quoting junk science, 1/16 were trying for first post in a different article and the remainder is divided up into legitimate questions and respons
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As an actual scientists working in a related field, I find this article is pretty boring and mostly hype. It is not that the work being done is unimportant, but it is one step short of a "everything is okay alarm." It is good things are still working, and yes progress is being made, but this isn't a big milestone or much in the form of news, even for many people in the field.
Slashdot has always had a lot of junk science and trolls in science articles. Things have gone downhill slightly, but is not crossi
Hydrogen atoms (Score:2)
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I googled "Proton source", image search, and this popped up:
http://blog.vixra.org/2011/05/29/new-luminosity-record-for-lhc/ [vixra.org]
At first glance a nice overview. This picture http://vixra.files.wordpress.com/2011/05/proton-source.jpg [wordpress.com] is your source. See the bottle of hydrogen there? :)
It says "Linac 2" in the background, the first accelerator at Cern, for protons.
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Re:Hydrogen atoms (Score:4, Informative)
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Ionizing H2 will absolutely break apart the molecules. You know that atomic bonds are made by the electrons, right? Two protons really don't like to be anywhere near each other unless there are electrons and/or neutrons involved.