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Fusion glossary

L

In 1955, British physicist John Lawson (1923-2008) demonstrated that the conditions for fusion rely on three vital parameters: temperature (T), density (n) and confinement time (τ). (Lawson's Criteria) 
Present in minerals and salt in the Earth's crust, lithium is the lightest metal. ITER will test specific lithium-containing wall modules to "breed" tritium. In effect, tritium can be produced within the tokamak when neutrons escaping the plasma interact with lithium contained in the blanket.
Low-level entryways into the ITER vacuum vessel. The 9 lower ports will provide access into the vessel for remote handling, diagnostics, heating, and vacuum systems.