Radiant energy – Electrically neutral molecular or atomic beam devices and...
Patent
1987-01-09
1988-08-09
Church, Craig E.
Radiant energy
Electrically neutral molecular or atomic beam devices and...
324 713, H05H 300
Patent
active
047629932
ABSTRACT:
A method and apparatus senses the deviation of a neutral particle beam from a predetermined direction. The neutral particle beam is derived from a composite particle beam having residual charged particles with substantially the same directional characteristics as the neutral particles making up the neutral particle beam. A deflection magnet deflects at least a portion of the charged particles from the composite particle beam a known amount toward a detector array including apertures for forming a plurality of charged particle beamlets. Deviation of the charged particle beamlet is determined as an indication of the direction of the neutral particle beam relative to the predetermined direction.
A similar measurement of neutral particles around the periphery of the neutral beam provides deviation data of the neutral beam which, when correlated with the data of the charged particle beam, provide an instantaneous transfer characteristic of the magnetic deflection system.
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The Review of Scientific Instruments, "Double Focusing with Wedge-Shaped Magnetic Fields", vol. 22, No. 3, p. 197, M. Camac, Mar. 1951.
The Review of Scientific Instruments, "Two-Directional Focusing of Charged Particles with a Sector-Shaped, Uniform Magnetic Field", vol. 22, No. 10, p. 717, William G. Cross, Oct. 1951.
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Enge, H. A., Focusing of Charged Particles, Academic Press, New York, 1967, vol. II, Chapter 4.2, "Deflecting Magnets".
Berman Jack I.
Church Craig E.
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