Neutral particle beam sensing and steering

Details Neutral particle beam sensing and steering Neutral particle beam sensing and steering

1990-08-30

1991-08-27

Berman, Jack I.

Radiant energy

Electrically neutral molecular or atomic beam devices and...

250397, H05H 300

Patent

active

050435744

ABSTRACT:
The direction of a neutral particle beam (NPB) is determined by detecting Ly.alpha. radiation emitted during motional quenching of excited H(2S) atoms in the beam during movement of the atoms through a magnetic field. At least one detector is placed adjacent the beam exit to define an optical axis that intercepts the beam at a viewing angle to include a volume generating a selected number of photons for detection. The detection system includes a lens having an area that is small relative to the NPB area and a pixel array located in the focal plane of the lens. The lens viewing angle and area pixel array are selected to optimize the beam tilt sensitivity. In one embodiment, two detectors are placed coplanar with the beam axis to generate a difference signal that is insensitive to beam variations other than beam tilt.

REFERENCES:
patent: 3435214 (1969-03-01), Bernstein et al.
patent: 4762993 (1988-08-01), Moses
patent: 4896032 (1990-01-01), Ball et al.

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