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The JET Joint undertaking is a scientific research establishment which was established to study the feasibility of nuclear fusion as a source of energy for the future. JET had a number of specific technical issues to address to demonstrate the feasibility of fusion as a viable energy source. The fusion experiments create a plasma within a toroidal shaped reaction vessel called Torus. The torus is constructed primarily from inconel and in the early stages of JET operation the plasma facing walls were made of unprotected inconel. As the experimental program developed technical considerations highlighted the need for a material other than inconel to protect the first wall from the plasma. This material had a large number of constraints put upon its properties, e.g. high melting point, low atomic number, good mechanical properties, high thermal conductivity etc. Early trials concentrated on the use of graphite tiles. However, in 1989 it was decided to introduce Beryllium into the JET machine. Initially as a layer evaporated onto the vessel walls, and later as protective tiles on specific in vessel components. Since its introduction into the machine in May 1989, beryllium has been associated with all work involving vessel components, whether carried out in vessel or in the associated working areas such as the Beryllium Handling Facilities or Waste Handing Facility

Additional information

Authors: HAIGH A D, JET Joint Undertaking, Abingdon (GB)
Bibliographic Reference: Article: JET-IR(99)03
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