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- Divertor abstract "In nuclear fusion power research, a divertor is a device that allows online removal of material from the fuel plasma while operating. This allows control over the buildup of fusion products in the fuel, and removes impurities from the vessel lining that enter the fuel mass.The divertor was initially introduced during the earliest studies of fusion power systems in the 1950s. It was realized early on that successful fusion would result in heavier ions being created and left in the fuel, the so-called "fusion ash". These radiated heat and caused other effects that made it more difficult to keep the reaction going. The divertor was proposed as a solution to this problem. Operating on the same principle as a mass spectrometer, the plasma was passed through the divertor region where heavier ions were flung out of the fuel mass by centrifugal force, colliding with some sort of absorber material and depositing its energy as heat. Initially considered to be a device required for operational reactors, few early designs included a divertor.When early long-shot reactors started to appear in the 1970s, a serious practical problem emerged. No matter how tightly constrained, plasma continued to leak out of the main confinement area, striking the walls of the reactor core and causing all sorts of problems. A major concern was sputtering in reactors with higher power and particle flux density, which caused ions of the vacuum chamber's metal walls to flow into the fuel and cool it.During the 1980s it became common for reactors to include a feature known as the limiter, a small piece of material that projected a short distance into the outer edge of the main plasma confinement area. Ions from the fuel travelling outwards would strike the limiter, protecting the walls of the chamber from this damage. However, the problems with material being deposited into the fuel remained; the limiter simply changed where that material was coming from.This led to the re-emergence of the divertor, as a device for protecting the reactor itself. In these designs, magnets pull the lower edge of the plasma to create a small region where the outer edge of the plasma, the "Scrape-Off Layer" (SOL), hits a limiter-like plate. The divertor improves on the limiter in several ways, but mainly because modern reactors try to create plasmas with D-shaped cross-sections ("elongation" and "triangularity") so the lower edge of the D is a natural location for the divertor. . In modern examples the plates are replaced by lithium metal, which better captures the ions and causes less cooling when it enters the plasma.In the tokamaks ITER and the latest configuration of Joint European Torus, the lowest region of the torus is configured as a divertor, while Alcator C-Mod was built with divertor channels at both top and bottom.A tokamak featuring a divertor is known as a divertor tokamak or divertor configuration tokamak. In this configuration, the particles are escaping through a magnetic "gap" (separatrix) allowing to place the energy absorbing part of the divertor out of the plasma. Divertor configuration also makes obtainig of the more stable "H-mode" of operation easier.The plasma facing material in the divertor faces significantly different stresses compared to the majority of the first wall.".
- Divertor thumbnail Alcator_C-Mod_Tokamak_Interior.jpg?width=300.
- Divertor wikiPageExternalLink limiters-and-divertors.
- Divertor wikiPageID "36986767".
- Divertor wikiPageRevisionID "605657499".
- Divertor hasPhotoCollection Divertor.
- Divertor subject Category:Fusion_power.
- Divertor comment "In nuclear fusion power research, a divertor is a device that allows online removal of material from the fuel plasma while operating. This allows control over the buildup of fusion products in the fuel, and removes impurities from the vessel lining that enter the fuel mass.The divertor was initially introduced during the earliest studies of fusion power systems in the 1950s.".
- Divertor label "Divertor".
- Divertor label "Divertor".
- Divertor label "Diwertor".
- Divertor label "Дивертор".
- Divertor label "偏滤器".
- Divertor sameAs Divertor.
- Divertor sameAs Diwertor.
- Divertor sameAs m.0n499b7.
- Divertor sameAs Q1230603.
- Divertor sameAs Q1230603.
- Divertor wasDerivedFrom Divertor?oldid=605657499.
- Divertor depiction Alcator_C-Mod_Tokamak_Interior.jpg.
- Divertor isPrimaryTopicOf Divertor.
