Radiant energy – Ion generation – Field ionization type
Patent
1995-03-21
1996-05-28
Berman, Jack I.
Radiant energy
Ion generation
Field ionization type
313230, 3133591, H01J 3708
Patent
active
055213898
ABSTRACT:
A solid state cesium ion gun comprises an ion emission pellet, a pellet heating mechanism, a replaceable ion source unit, ion extraction electrodes, and a self-supporting feedthrough flange. The ion emission pellet is capable of emitting positive cesium ions. One end of the pellet is sputter coated with a thin film of porous tungsten (cathode) from which ions are emitted. The other end of the pellet (anode) is coated with platinum which enables application of a bias to the pellet to direct the cesium ions toward the emitting electrode. The area of the anode electrode determines the life of the ion source. The ion emission pellet is heated to 1000.degree. C. and is not in contact with the beam forming electrode so as to minimize the heat losses. A thin tantalum or molybdenum tube is used to enclose the pellet and minimizes heat conduction losses. The ion gun includes a replaceable ion source unit and a mountable gun unit which mounts extraction electrodes. The ion source unit can be replaced when the pellet has exhausted all of its cesium.
REFERENCES:
patent: 2261569 (1941-11-01), Schultz
patent: 2816243 (1957-12-01), Herb et al.
patent: 2901628 (1959-08-01), Lamb
patent: 4783595 (1988-11-01), Seidl
patent: 4994711 (1991-02-01), Matossian
Cesium ion Transport across a solid electrolyte-porous tungsten interface, S. I. Kim and M. Seidl, J. Vac. Sci Technol. A 7 (3) May/Jun. 1989, pp. 1806-1809.
Theory Of Metal-Solid Electrolyte Interface, S. I. Kim, M. Seidl, Physics/Engineering Physics Department, Stevens Institute of Technology, Hoboken, N.J., Mal. Res. Symp. Proc. vol. 135, 1989 Materials Research Society, pp. 95-100.
Solid-state cesium ion gun for ion beam sputter deposition, S. I. Kim, Y. O. Ahn, and M. Seidel, Department of Physics, Stevens Institute of Technology, Hoboken, N.J. 07030, Rev. Sci. Instrum. 63 (12) Dec. 1992, 1992 American Institute of Physics, pp. 5671-5673.
Sputtering negative carbon ions from cesiated graphite surfaces, A. Pargellis and M. Seidl, J. Vac. Sci. Technol. A 1 (3) Jul.-Sep. 1983, 1983 American Vacuum Society, pp. 1388-1393.
A New Solid-State Cesium Ion Source, by S. I. Kim and M. Seidl, Physics/Engineering Stevens Institute of Technology, J. Appl. Phys. 67 (6), 15 Mar. 1990, pp. 2704-2710.
Aluminosilicate-composite type ion source of alkali ions by D. W. Hughes, R. K. Feeney and D. N. Hill Rev. Sci. Instrum 51(11), Nov. 1980 American Institute of Physics pp. 1471-1473.
Ion Propulsion Technology and Applications by G. R. Brewer, Gordon and Breach Science Publishers 102-107.
Lithium Ion Emitter for Low Energy Beam Experiments, by O. Heinz and R. T. Reaves Received Apr. 1, 1968, pp. 1229-1230.
A Sputter Pig Source (SPIGS) For Negative Ions by H. V. Smith, Jr. and H. T. Richards Nuclear Instruments and Methods 125 No. 4 1975 pp. 497-502.
A Hollow-Beam Prototype of the Universal Negative Ion Source For Tandem Accelerators J. E. Sherwood and R. D. Zwicker pp. 43-45, Nuclear Instruments and Methods 129 No. 1 (1975).
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