Glossary

n, number density

The number of plasma particles in a unit volume (not to be confused with density which is mass per unit volume). One of the three Lawson Criteria, along with confinement time and temperature. The number density typically used in JET is one millionth of atmospheric density – the low value is required to prevent large losses of energy due to bremsstrahlung.

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

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