Basically, the accelerator itself and therefore the particules are going through ATLAS. Collisions between particules (going in opposite directions) are setup to happen within the core of ATLAS. The objective is to build various layers of (different types of) detectors around this point of collision to search for specific particules with a very short lifetime generated by the collision.
These differents layers of detection generate lots of data that is filtered to isolate a few 'interesting' events, which can then be processed by the computing Grid.
I am not a particule physicist, but the particules need be accelerated and are 'pushed' by the magnets before being collided, so they need to circulate many times around the accelerator in order to get sufficient speed.
"A beam might circulate for 10 hours, travelling more that 10 billion kilometres, enough to get to the planet Neptune and back again. At near light-speed, a proton in the LHC will make 11 245 circuits every second."
To magnets are used also to maintain the beam within its path, and the requires huge amount of energy to create a magnetic field that is strong enough to prevent the beam to escape. These magnets are using a massive amount of power, and must be cooled down (a lot) do reduce their electrical resistance down to supraconductivity.
"In order to cool the magnets down to -193.16 C (pre-cooling), 10 080 tonnes of liquid nitrogen will be used. Afterwards, the refrigerators turbines will bring the helium temperature down to -268.7 C and fill the magnets with almost 60 tonnes of liquid helium. Once the magnets are filled, the refrigeration units will bring the temperature down to -271.3 C by lowering the saturation pressure - and therefore the temperature - of the liquid helium in a heat exchanger in contact with the static pressurized helium of the magnets' cold masses." http://public.web.cern.ch/Public/Content/Chapters/ AskAnExpert/LHC-en.html
I'm afraid the article does not relate *at all* what happens in France at the moment, regarding DRM and "Internet piracy".
The French parliament is currently discussing new laws, that will implement the EUCD directive, by forbidding and severly punishing any attempt to circumvent DRM protection and copyrighted material downloads. This project is called DADvSI. Some MPs are even pushing to forbid the development, diffusion and the use of P2P software.
Lots of (artits, users, musicians, etc.) communities are opposed to all this. MPs first voted against this project and adopted a global licence (monthtly fee for unrestricted private downloads), but the French minister of Culture said it was not acceptable and he had the parliament to re-discuss the project again.
Slashdot Mirror
Basically, the accelerator itself and therefore the particules are going through ATLAS. Collisions between particules (going in opposite directions) are setup to happen within the core of ATLAS. The objective is to build various layers of (different types of) detectors around this point of collision to search for specific particules with a very short lifetime generated by the collision.
I nstallation/atlas_overview.gif
http://atlas.web.cern.ch/Atlas/TCOORD/Activities/
These differents layers of detection generate lots of data that is filtered to isolate a few 'interesting' events, which can then be processed by the computing Grid.
Romain.
> why do we need to bend the particles path
/ AskAnExpert/LHC-en.html
/ AskAnExpert/LHC-en.html
r
I am not a particule physicist, but the particules need be accelerated and are 'pushed' by the magnets before being collided, so they need to circulate many times around the accelerator in order to get sufficient speed.
"A beam might circulate for 10 hours, travelling more that 10 billion kilometres, enough to get to the planet Neptune and back again. At near light-speed, a proton in the LHC will make 11 245 circuits every second."
What is the LHC power consumption?
It is around 120 MW which corresponds more or less to the power consumption for households in the Canton (State) of Geneva."
http://public.web.cern.ch/Public/Content/Chapters
> why does the magnet need to be super cooled?
To magnets are used also to maintain the beam within its path, and the requires huge amount of energy to create a magnetic field that is strong enough to prevent the beam to escape. These magnets are using a massive amount of power, and must be cooled down (a lot) do reduce their electrical resistance down to supraconductivity.
"In order to cool the magnets down to -193.16 C (pre-cooling), 10 080 tonnes of liquid nitrogen will be used. Afterwards, the refrigerators turbines will bring the helium temperature down to -268.7 C and fill the magnets with almost 60 tonnes of liquid helium. Once the magnets are filled, the refrigeration units will bring the temperature down to -271.3 C by lowering the saturation pressure - and therefore the temperature - of the liquid helium in a heat exchanger in contact with the static pressurized helium of the magnets' cold masses."
http://public.web.cern.ch/Public/Content/Chapters
http://en.wikipedia.org/wiki/Large_Hadron_Collide
For reference, the LHC will also use a massive computing Grid: http://www.cern.ch/LCG/
Romain.
...has been released 25 minutes before the actual OS release. Generally you need to wait for at least a few minutes!
i st/2006-March/msg00027.html
i st/2006-March/msg00026.html
* From: Fedora Project
* To: fedora-announce-list redhat com
* Subject: Announcing the release of Fedora Core 5
* Date: Mon, 20 Mar 2006 11:18:16 -0500
https://www.redhat.com/archives/fedora-announce-l
* From: "Raymond Strode"
* To: fedora-announce-list redhat com
* Subject: [SECURITY] Fedora Core 5 Update: xorg-x11-server-1.0.1-9
* Date: Mon, 20 Mar 2006 10:55:41 -0500
https://www.redhat.com/archives/fedora-announce-l
--
Romain.
I'm afraid the article does not relate *at all* what happens in France at the moment, regarding DRM and "Internet piracy".
- la-licence-globale-repasse-la-trappe.html
The French parliament is currently discussing new laws, that will implement the EUCD directive, by forbidding and severly punishing any attempt to circumvent DRM protection and copyrighted material downloads. This project is called DADvSI.
Some MPs are even pushing to forbid the development, diffusion and the use of P2P software.
Lots of (artits, users, musicians, etc.) communities are opposed to all this.
MPs first voted against this project and adopted a global licence (monthtly fee for unrestricted private downloads), but the French minister of Culture said it was not acceptable and he had the parliament to re-discuss the project again.
More information (all in French) at:
http://fr.news.yahoo.com/10032006/7/projet-dadvsi
http://eucd.info/
http://lestelechargements.fr/
http://www.odebi.org/new/theme/
http://www.adami.fr/