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. 2010 Mar 13;368(1914):1091–1108. doi: 10.1098/rsta.2009.0216

Figure 3.

Figure 3.

Selected results from different tokamaks demonstrate substantial progress over recent decades from the low temperature, low energy gain points at the bottom left. Temperatures above 100 M°C are now routinely achieved and an energy gain of around one has been reached. A power plant needs an energy gain (Q) above 10, and this should be achieved in ITER.