| 摘 要： | A non-intercepting gridded gun with the perveance of 1.4μP is described.Three different grid-mesh shapes(square,hexagonal and annular)are chosen,and the experimental results in an electronbeam analyzer are given in detail.The design methods of the gun for each grid-mesh shape andthe structures of the test system are briefly introduced.The results measured by using the fluorescentscreen and pin-hole scanning technique are given.It turns out that the annular grid possessed thebest electron optical performance.The reason that the performance of the annular grid is betterthan the others is qualitatively explained and discussed,so as to give the guide lines of how to designthe non-intercepting gridded guns.Through the experiment and the computer calculation for severalnon-intercepting gridded guns,the previous wrong conceptional conclusions about the performancesof the guns with and without grid may be corrected.
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