# Energy confinement time

From FusionWiki

The energy confinement time is defined as a function of the global plasma energy content, *W*, and the applied total heating power, *P*:
^{[1]}

- $ \tau_E = \frac{W}{P-dW/dt} $

It is one of the main figures of merit of magnetically confined plasmas, and one of the factors of the Lawson criterion for fusion.

## See also

## References

- ↑ J.P. Freidberg,
*Plasma physics and fusion energy*, Cambridge University Press (2007) ISBN 0521851076