Fluid-cooled particle-beam transmission window
US5898261A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1996 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Jan 31, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J33/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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 usin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.