PPT Slide

NBI System Design Considerations (Prelim.)

• At Eb = 120 keV, the neutralization efficiency for D+ ions is 0.53,

which is quite adequate to allow for a positive-ion based system.

• The ion source and accelerator can be based on the CLPS (Common

Long Pulse Source), developed at LBNL, which was installed on

DIII-D and TFTR NB injectors. Based on the TFTR design, the

120 keV source has :

Source current = 70 A

Beam Perveance = 1.7 _Perv.

Aperture size = 12 cm x 44 cm.

Projected beam efficiency _b = Pinj/Psource = 0.48

(incl. neutralization, collimation, beam reionization, etc.)

• A typical 32-MW beam module will have a 2x2 array of sources with

beams combined and focused near first wall aperture. Drift duct has

50 cm x 100 cm cross section.

- Aperture first wall area per module ~ 0.7 m2

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