PPT Slide

_

Beamline

Determining NB Parameters for Off-Axis Current Drive

• Three main criteria : (1) current profile alignment, (2) rotation generation

efficiency, and (3) CD efficiency.

• Beam parameter variables: (1) beam injection angle, _; (2) beam energy, Eb.

• The beam injection angle _ can be adjusted to provide a driven

current profile that matches very well with the off-axis seed profile.

Lower _ results in deeper penetration, broader profile, but lower

CD efficiency. Typically, 45o < _ < 75o.

Top View of

Tokamak

AT Plasma

_N = 6.8

Eb = 120 keV

seed

_ = 70o

60o

50o

NBCD

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