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Neutral beam current drive (NBCD) on the EAST tokamak is studied by usingMonte-Carlo test particle code TGCO. Phase-space structure of the steady-statefast ion distribution is examined and visualized. We find that trapped ionscarry co-current current near the edge and counter-current current near thecore. However, the magnitude of the trapped ion current is one order smallerthan that of the passing ions. Therefore their contribution to the fast ioncurrent is negligible (1% of the fast ion current). We examine the dependenceof the fast ion current on two basic plasma parameters: the plasma current I_pand plasma density n_e. The results indicate that the dependence of fast ioncurrent on I_p is not monotonic: with I_p increasing, the fast ion currentfirst increases and then decreases. This dependence can be explained by thechange of trapped fraction and drift-orbit width with I_p. The fast ion currentdecreases with the increase of plasma density n_e. This dependence is relatedto the variation of the slowing-down time with n_e, which is already well knownand is confirmed in our specific situation. The electron shielding effect tothe fast ion current is taken into account by using a fitting formulaapplicable to general tokamak equilibria and arbitrary collisionality regime.The dependence of the net current on the plasma current and density follows thesame trend as that of the fast ion current.

Simulation of neutral beam current drive on EAST tokamak