Neutral particle beam intensity controller

Induced nuclear reactions: processes – systems – and elements – Nuclear fusion – Magnetic confinement of plasma

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376147, 250251, 250396R, 3133611, G21B 100

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active

045966877

ABSTRACT:
A neutral beam intensity controller is provided for a neutral beam generator in which a neutral beam is established by accelerating ions from an ion source into a gas neutralizer. An amplitude modulated, rotating magnetic field is applied to the accelerated ion beam in the gas neutralizer to defocus the resultant neutral beam in a controlled manner to achieve intensity control of the neutral beam along the beam axis at constant beam energy. The rotating magnetic field alters the orbits of ions in the gas neutralizer before they are neutralized, thereby controlling the fraction of neutral particles transmitted out of the neutralizer along the central beam axis to a fusion device or the like. The altered path or defocused neutral particles are sprayed onto an actively cooled beam dump disposed perpendicular to the neutral beam axis and having a central open for passage of the focused beam at the central axis of the beamline. Virtually zero therough 100% intensity control is achieved by varying the magnetic field strength without altering the ion source beam intensity or its species yield.

REFERENCES:
patent: 4101765 (1978-07-01), Hooper, Jr.
patent: 4349505 (1982-09-01), Stirling
Proc. of the 7th Symp. on Engineering Problems of Fusion Research, Knoxville, Tenn. 10/77, pp. 549-554, Colleraine et al.

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