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A degree of uncertainty exists is predicting the confinement properties and plasma performance in a tokamak device. This report considers the following relevant matters:

- Mechanisms of transport in a tokamak;
- Experimental description of confinement and transport;
- L-H and H-L transition physics;
- Impact of global instabilities on transport;
- Global energy confinement scalings;
- Scaling studied with similar dimensionless physics parameters;
- 1-dimensional transport models;
- Particle transport (hydrogen, helium and impurities);
- Momentum confinement;
- Confinement research in support of the international thermonuclear experimental reactor (ITER).

In summary, a qualitative understanding of the energy confinement process taking place in a tokamak is now available and fairly firm confidence intervals have been given for the ITER predictions. predictions.

Additional information

Authors: ITER EXPERT GROUP, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(98)17 EN (1998) 199pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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