This paper is an extension of global plasma confinement in electron‐cyclotron operation to neutral beam heated plasmas in TJ‐II. The reported NBI plasmas have been obtained under lithium‐coated wall conditions. The plasma operation exhibits a substantially better density control and improved confinement as compared to similar boron‐coated wall discharges heated by NBI. Regression analyses of energy confinement time yield a scaling law indicating degradation with power with an exponent of αP = 0.8. The scaling shows an improvement with density with exponent αn = 0.5. The dependencies on plasma radius and rotational transform have not been resolved so far because the –still incomplete– NBI database suffers from a high correlation between these two parameters (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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