PPT Slide

Assessment of Rotation Drive by NBI

• Moderate energy beams are efficient in driving rotation because of

their high momentum content per unit power.

• The physics of momentum transfer from beams and its radial transport

is a topic of present research. Measured rotation speeds are much

lower than neoclassical predictions, implying momentum confinement

is anomalous, and characterized by energy confinement time, _E.

• An estimate of beam induced rotation using simple momentum

rate balance, and assuming plasma to be rigid.

Momentum input rate per ion: ~ Pb (2mb/Eb)1/2 / Vpl

Momentum loss rate per ion: mi v_ / _E

where v_ is bulk rotation speed, and Vpl is plasma volume.

• Beam-induced rotation profiles will be calculated using ONETWO

transport code.

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