Abstract
Summary The vacuum design of a proposed large toroidal pinch experiment and some of the development work undertaken is described. The system comprises four main parts. A thin inconel bellows liner (surface area 160 m 2 ) contains the plasma and is bakeable to achieve uhv. This liner is protected by a guard vacuum to relieve it of atmospheric pressure load and the consequences of pinhole formation. The guard region also gives thermal and electrical insulation. A gas admittance system is used to pulse fill the liner with 0.1 to 10 mtorr of H 2 , D 2 or He with tracer gases. Criteria for choosing the pumping speed (7000 l s −1 at the liner) and other vacuum parameters (e.g. maximum permitted leakage) have been developed to minimize impurities in the plasma. Contamination by low mass number elements Data obtained from tests of several materials (including perflouroelastomer) likely to be used in vacuum and plasma diagnostic components will be given.
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