Electric lamp and discharge devices – Cathode ray tube – Electron permeable window
Patent
1996-01-31
1999-04-27
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Electron permeable window
313 46, 313 35, 313 20, 313 33, H01J 3304
Patent
active
058982612
ABSTRACT:
High fluence charged-particle beams are generated in a vacuum or near vacuum environment. To use these beams in an atmospheric pressure environment, they must pass through some form of transmission window between the two environments. To date, thin single metal foils have been used for these transmission windows. The total practical fluence of such transmitted beams is limited by the ability of the window to dissipate the excess heat deposited in it by the transiting beam. Existing windows have relied only on simple radial heat conduction through the thin foil, radiative cooling from the foil faces, and/or flowing cooling fluids on the high-pressure face of the foil. The present invention, however, proposes to enclose one or more channels within a double foil window and to flow a cooling fluid through such channel(s). The window cooling rate is thus significantly improved over air convection because of fully-developed turbulent flow and a higher cooling mass transport through such channels(s). Calculations show that a 2-3 order-of-magnitude increase in the time-averaged particle beam current density can be realized while maintaining the physical integrity of the foil window by using the so cooled foil window of the present invention.
REFERENCES:
patent: 4409511 (1983-10-01), Loda et al.
patent: 4455561 (1984-06-01), Boyden et al.
patent: 4494036 (1985-01-01), Neukermans
patent: 5235239 (1993-08-01), Jacob et al.
patent: 5416440 (1995-05-01), Lyons et al.
Patel Ashok
Stover Thomas C.
The United States of America as represented by the Secretary of
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