Abstract
Progress in high-energy physics and nuclear fusion research requires among other things an ultra-cleàn, hydrocarbon-free vacuum environment. The use of large turbomolecular pumps as roughing and high vacuum pumping systems for particle accelerators and for the torus and diagnostic system of plasma fusion experiments is described. Special emphasis is given to the behaviour of such pumps under the specific conditions of these experiments. The impact of tritium and a radioactive environment and the presence of strong magnetic fields requires the use of selected materials within the pump. The necessary modifications of a standard turbomolecular pump are described in detail. Such a modified turbomolecular pump is capable of pumping tritium and to withstand a radiation dose of 10 8 rad.
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