Loss power

The loss power or power flowing through the last closed flux surface into the Scrape-Off Layer is defined as

$P_{SOL}=P_{Ohm}+P_{alpha}+P_{aux}-P_{rad,core}-{\frac {dW}{dt}}$

or the sum of Ohmic, alpha (fusion), and auxiliary heating power minus power radiated out of the core and changes in stored energy. Auxiliary power can be delivered by neutral beams or RF heating sources.