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- Laser_Mégajoule abstract "Laser Mégajoule (LMJ) is a large laser-based inertial confinement fusion (ICF) research device being built near Bordeaux, in France by the French nuclear science directorate, CEA. Laser Mégajoule plans to deliver about 1.8 MJ of laser energy to its targets, making it about as energetic as its US counterpart, the National Ignition Facility (NIF). Laser Mégajoule is the largest ICF experiment to be built outside the US, where ICF research has been strongly related to nuclear weapons research. Likewise, Laser Mégajoule's primary tasks will be refining fusion calculations for France's own nuclear weapons.Laser Mégajoule uses a series of 176 laser beamlines. Each beamline contains two main glass amplifiers, which are optically pumped using xenon flashlamps. A "feeder" laser beam is fed via optical fiber into each of the beamlines where it travels through the two amplifiers. In order to extract more power from the amplifiers, which are not particularly efficient in transmitting power to the beam, the laser pulse is sent through the amplifiers twice by an optical switch in front of a mirror. At the other end of the beamline a deformable mirror is used to remove imperfections in the wavefront.The target chamber lies in a large experiment room in the middle of the building, with the beamlines arranged on either side. After being switched into the main room, the beams are first aimed towards the target chamber by mirrors, and then travel through an optical frequency multiplier to boost the frequency into the ultraviolet. The mirrors are arranged in order to have the pulse impinge in the middle of the chamber from all sides.Like NIF, LMJ intends to use the "indirect drive" approach, where the laser light is used to heat a high-Z cylinder made of some heavy metal (often gold) known as a "hohlraum". The hohlraum then gives off x-rays, which are used to heat a small fuel pellet containing a deuterium-tritium (DT) fusion fuel. Although considerable laser energy is lost to heating the hohlraum, x-rays are much more efficient at heating the fuel pellet, making the indirect drive method applicable to nuclear weapons research. The x-rays rapidly heat the outer layer of the pellet so quickly that it explodes outward, causing the remainder of the pellet to be forced inward and causes a shock wave to travel in through the pellet to the middle. When the shock wave converges from all directions and meets in the middle, the density and temperature briefly reach the Lawson criterion and start fusion reactions. If the rate of reactions is high enough the heat generated by these reactions will be enough to cause surrounding fuel to fuse as well, this process continuing until the majority of the fuel in the pellet is consumed. This process is known as "ignition", and has long been a goal of fusion researchers.Construction on the Laser Mégajoule started with a single set of eight beamlines known as the Ligne d'Intégration Laser (Laser Integration Line), or LIL, powered by a 450 MJ energy bank. When problems are worked out in the LIL, construction will continue with the construction of four more similar units and the installation of the additional beamlines. LIL was completed in 2002. The first laser beam shots were planned for the beginning of 2014, but commencement of operations was later postponed until December of that year.".
- Laser_Mégajoule thumbnail Monocristal_dsc03676.jpg?width=300.
- Laser_Mégajoule wikiPageExternalLink index-en.htm.
- Laser_Mégajoule wikiPageExternalLink index.htm.
- Laser_Mégajoule wikiPageExternalLink megajoule_laser.htm.
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- Laser_Mégajoule wikiPageWikiLink Atomic_number.
- Laser_Mégajoule wikiPageWikiLink Bordeaux.
- Laser_Mégajoule wikiPageWikiLink Category:Inertial_confinement_fusion_research_lasers.
- Laser_Mégajoule wikiPageWikiLink Commissariat_xc3xa0_lxc3x89nergie_Atomique.
- Laser_Mégajoule wikiPageWikiLink Commissariat_xc3xa0_lxc3xa9nergie_atomique_et_aux_xc3xa9nergies_alternatives.
- Laser_Mégajoule wikiPageWikiLink Deuterium.
- Laser_Mégajoule wikiPageWikiLink English_language.
- Laser_Mégajoule wikiPageWikiLink Flashtube.
- Laser_Mégajoule wikiPageWikiLink Force_de_Frappe.
- Laser_Mégajoule wikiPageWikiLink Force_de_dissuasion.
- Laser_Mégajoule wikiPageWikiLink France.
- Laser_Mégajoule wikiPageWikiLink French_language.
- Laser_Mégajoule wikiPageWikiLink Gold.
- Laser_Mégajoule wikiPageWikiLink Hohlraum.
- Laser_Mégajoule wikiPageWikiLink Inertial_confinement_fusion.
- Laser_Mégajoule wikiPageWikiLink Laser.
- Laser_Mégajoule wikiPageWikiLink Laser_Integration_Line.
- Laser_Mégajoule wikiPageWikiLink Laser_integration_line.
- Laser_Mégajoule wikiPageWikiLink Lawson_criterion.
- Laser_Mégajoule wikiPageWikiLink Mexico_City.
- Laser_Mégajoule wikiPageWikiLink National_Ignition_Facility.
- Laser_Mégajoule wikiPageWikiLink Nuclear_fusion.
- Laser_Mégajoule wikiPageWikiLink Nuclear_weapon.
- Laser_Mégajoule wikiPageWikiLink Optical_fiber.
- Laser_Mégajoule wikiPageWikiLink Optical_frequency_multiplier.
- Laser_Mégajoule wikiPageWikiLink Optical_pumping.
- Laser_Mégajoule wikiPageWikiLink Optical_switch.
- Laser_Mégajoule wikiPageWikiLink Tritium.
- Laser_Mégajoule wikiPageWikiLink Ultraviolet.
- Laser_Mégajoule wikiPageWikiLink X-ray.
- Laser_Mégajoule wikiPageWikiLink File:Monocristal_dsc03676.jpg.
- Laser_Mégajoule wikiPageWikiLinkText "LMJ".
- Laser_Mégajoule wikiPageWikiLinkText "Laser Mégajoule".
- Laser_Mégajoule wikiPageWikiLinkText "Megajoule laser".
- Laser_Mégajoule hasPhotoCollection Laser_Mégajoule.
- Laser_Mégajoule wikiPageUsesTemplate Template:Coord.
- Laser_Mégajoule wikiPageUsesTemplate Template:For.
- Laser_Mégajoule wikiPageUsesTemplate Template:Fusion_experiments.
- Laser_Mégajoule subject Category:Inertial_confinement_fusion_research_lasers.
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- Laser_Mégajoule type SpatialThing.
- Laser_Mégajoule comment "Laser Mégajoule (LMJ) is a large laser-based inertial confinement fusion (ICF) research device being built near Bordeaux, in France by the French nuclear science directorate, CEA. Laser Mégajoule plans to deliver about 1.8 MJ of laser energy to its targets, making it about as energetic as its US counterpart, the National Ignition Facility (NIF). Laser Mégajoule is the largest ICF experiment to be built outside the US, where ICF research has been strongly related to nuclear weapons research.".
- Laser_Mégajoule label "Laser Mégajoule".
- Laser_Mégajoule sameAs Laser_Mégajoule.
- Laser_Mégajoule sameAs Laser_Megajoule.
- Laser_Mégajoule sameAs Laser_Mégajoule.
- Laser_Mégajoule sameAs m.0g_9pt.
- Laser_Mégajoule sameAs Q3218278.
- Laser_Mégajoule sameAs Q3218278.
- Laser_Mégajoule lat "44.64191111111111".
- Laser_Mégajoule long "-0.7877527777777777".
- Laser_Mégajoule wasDerivedFrom Laser_Mégajoule?oldid=641576985.
- Laser_Mégajoule depiction Monocristal_dsc03676.jpg.
- Laser_Mégajoule isPrimaryTopicOf Laser_Mégajoule.