Incremental energy confinement time during HO beam heating in JT-60

Characteristics are presented of the energy confinement time resulting from neutral hydrogen beam heating of JT-60 tokamak plasmas with a plasma current, Ip, of 1-2 MA, a line averaged electron density, n-bare, of 1.5-7x1019m-3 and an absorbed beam power, Pabs, up to 20 MW. The plasma energy content follows an offset linear relation to the absorbed power. The incremental energy confinement time for thermal components, τEinc, is almost independent of Ip and n-bare at 60 ms, while the incremental energy confinement time for the total plasma energy, τEGinc, decreases with plasma density. The value of τEinc in JT-60 coincides with the prediction of the Shimomura-Odajima scaling of L-mode discharges. (author)