Electric lamp and discharge devices – With positive or negative ion acceleration – Supplying ionizable material
Patent
1992-07-13
1995-02-21
O'Shea, Sandra L.
Electric lamp and discharge devices
With positive or negative ion acceleration
Supplying ionizable material
250427, 31511181, H01J 2702, H05H 124
Patent
active
053919629
ABSTRACT:
A negative ion source is disclosed wherein an electron beam produced in one chamber is used to sustain a discharge in another chamber whose conditions are independently adjusted for optimum production of vibrationally excited hydrogen molecules. By including a provision for an independently controlled source of low energy electrons in a region near the extraction aperture, the optimum conditions for creation of H.sup.- ions by dissociative attachment are produced. In this manner the current and brightness of a H.sup.- beam may be maximized.
REFERENCES:
patent: 3702973 (1972-11-01), Daugherty et al.
patent: 4559477 (1985-12-01), Leung et al.
J. R. Hiskes et al., "Analysis of the H.sub.2 Vibrational Distribution in a ydrogen Discharge," Applied Physics Letter, vol. 54, No. 6, Feb. 6, 1989, pp. 508-510.
J. R. Hiskes, "Review of Progress in the Theory of Volume Production," presented at the 4th Intl Symposium on the Production and Neutralization of Negative Ions and Beams, Brookhaven National Lab, Oct. 27-31, 1986, pp. 1-13, Oct. 24, 1986.
J. G. Alessi et al., "The BNL Toroidal Volume H.sup.- Source," 1991 Particle Accelerator Conference, San Francisco, Calif., May 6-9, 1991.
Lavan Michael J.
Roberts Thomas G.
Strickland Brian R.
Bush Freddie M.
Nicholson Hugh P.
O'Shea Sandra L.
The United States of America as represented by the Secretary of
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