Radiant energy – With charged particle beam deflection or focussing – Magnetic lens
Patent
1980-07-02
1982-12-21
Cangialosi, S. A.
Radiant energy
With charged particle beam deflection or focussing
Magnetic lens
2505031, 376913, G21K 108
Patent
active
043651607
ABSTRACT:
Disclosed is a method and apparatus for enhancing the brightness of both continuous and pulsed positron beams. By subjecting positrons to non-conservative forces in an interaction region, typically by means of a positron moderator such as a single crystal Cu(111)+S moderator, it is possible to circumvent the limitation, expressed in Liouville's theorem, of the optimally achievable brightness of a beam. The inventive method can be applied in successive stages involving accelerating and focusing a moderated positron beam, and moderating the energetic positrons to thermal energies, resulting typically in an increase in brightness by a factor of about 100 per stage, with an attendant reduction of flux by about factors of ten or less.
REFERENCES:
patent: 2974280 (1961-03-01), Hoover
Appl. Phys. Lett., vol. 35, pp. 427-429 (9/1/79) Mills.
Intro. to Electron and Low Optics, Academic Press, N.Y., pp. 11-13 and pp. 19-22 (1973).
Statistical Physics, Addison-Wesley (1969) Landau et al., pp. 9 & 10.
Bell Telephone Laboratories Incorporated
Cangialosi S. A.
Laumann Richard D.
Wilde Peter V. D.
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