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File:The JET magnetic fusion experiment in 1991.jpg

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English: The Joint European Torus (JET) magnetic fusion experiment in 1991

At the heart of this jumble of machinery is a doughnut shaped vessel 6 metres across and 2.4 metres high, although this is obscured by the myriad heating, cooling and measuring systems which surround it.

Some examples of these: the large orange limbs are iron, for concentrating the magnetic field that controls the hot gases inside the vessel, at temperatures up to 200 million degrees. The tall white tower in the right foreground houses the eight neutral beam heaters, which use 100 000 volts to shoot gas into the vessel. On the smaller white cylinder to its right are an array of mirrors for directing lasers into the hot gas to measure its temperature and density with Thompson Scattering. The white box in the left foreground is an apparatus to measure the energy of neutrons - the essential product of fusion. At far left the segmented white tower is the Pellet Injection Box, which fuels the experiment with tiny ice cubes of fuel at minus 260 degrees celsius.

Next to that a white frame supports an array of black tubes which channel megawatts of microwave heating into the plasma. On top of the structure sit large water cooling pipes, and four yellow cranes for moving components around during maintenance.
Deutsch: Das Fusionsexperiment JET in 1991

Im Inneren dieses unübersichtlichen Konstruktes befindet sich ein wie ein Doughnut geformtes Stahlgefäß mit einem Durchmesser von 6 Metern und einer Höhe von 2,4 Metern. Das Gefäß wird verdeckt von hunderten von Heiz-, Kühl- und Messsystemen, von denen einige nachfolgend beschrieben werden: Die orangefarbenen Strukturen bestehen aus Eisen. Ihre Magnetfelder schließen das heiße Gas bei Temperaturen bis zu 200 Millionen Grad Celsius ein. Der schmale weiße Turm im rechten Bildrand beherbergt acht Neutralteiteilchen-Heizungen, die Gas mit 100.000 Volt in die Reaktorkammer einspeisen. Der kleinere weiße Zylinder zur Rechten der Neutralteilchen-Heizung beherbergt eine Kombination mehrerer Spiegel, die Laserlicht zur Bestimmung der Plasmatemperatur in die Kammer leiten. Dies geschieht mit Hilfe der sogenannten Thomson Scattering Methode.

Der weiße Kasten am linken Bildrand misst die Energie von Neutronen - dem energielieferenden Produkt der Fusionsreaktion. Der weiße Turm in der linken Bildmitte ist der Pelletinjektor. Er versorgt das Experiment mit auf 260 Grad Celsius heruntergekühlten, gefrorenen Brennstoffkügelchen. In direkter Nachbarschaft des Pelletinjektors ist die Mikrowellenheizung zu sehen. Durch die schwarzen Schläuche werden Mikrowellen dirigiert, die das Plasma zusätzlich zu Neutralteilchen- und Mikrowellenheizung auf die notwendige Temperatur aufheizen. JET's Dach umgibt große Kühlschläuche. Vier an der Decke befestigte gelbe Kräne bewegen die tonnenschweren Komponenten während Umbaumaßnahmen, wenn dies notwendig ist.
Date
Source Own work
Author EFDA JET
Camera location51° 39′ 04.79″ N, 1° 16′ 11.81″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMap - Google Earthinfo

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