Electronic load restraining type high-voltage accelerating tube

Abstract

The invention discloses an electronic load restraining type high-voltage accelerating tube which comprises an electronic gun cathode emission surface, an electronic gun absorbing pole and a plurality of sections of accelerating tubes. Secondary electron beam limiting light bar devices are arranged among the accelerating tubes, and can effectively block secondary electron orbits. The secondary electron beam limiting light bar devices which are applied for a first time are used as an important supplement measure and matched with an existing 'grain trap' device, can entirely eliminate the 'electronic load' phenomenon of 4 to 5 MV accelerators, can reduce high-voltage workout time, and reach rated high voltage of the accelerator faster. Meanwhile the intensity of X-rays generated on the upper accelerating tubes by the secondary electrons can be reduced, and high-voltage stability can be increased. In addition, the secondary electron beam limiting light bar devices with a large caliber can reduce the influence to the vacuuming speed of an electronic gun area. Compared with other methods of restraining the secondary electrons, the electronic load restraining type high-voltage accelerating tube is simple in structure and convenient to install.

Description

technical field [0001] The invention relates to a high-voltage electron accelerator, in particular to a high-voltage accelerating tube capable of suppressing or even eliminating electronic load. Background technique [0002] In DC high-voltage accelerators, such as electrostatic accelerators, electronic rectification ELV accelerators, and Dynamitron high-frequency high-voltage accelerators, charged ions are accelerated in high-vacuum accelerator tubes. In the acceleration tube, due to factors such as stray beam current, residual gas collision, and electrode surface contamination, positive and negative ion exchange often occurs; when the accelerator voltage is relatively high, such as 4~5MV, the acceleration tube will be used for a long time , the generated secondary ions or electrons may be accelerated to relatively high energy; when these secondary ions or electrons bombard other electrodes, the output of secondary electrons may be more than the number of incident particles...

AI Technical Summary

Problems solved by technology

In the recent 5MV Dirami accelerator produced by iba in Belgium, apart from a "particle trap" installed in the middle, there are no other devices to suppress the "electronic load"; It can be seen that the secondary electrons generated at the bottom of the electron gun’s suction pole are not suppressed in any way, and the distance that can be accelerated will be very long, and the energy obtained will be very large; therefore, it is very likely to cause a certain degree of secondary electron load effect; After a long period of time, strict procedures of high-pressure exercise can eliminate

Images