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A method to test the stability of high lead glass CEM is given and some results are obtained,The life-test datum with an accumulative count about 10~(11)is obtained;the structure and compositionof active surface of fatigued CEM are analyzed by using AES,We find the increase of carbon onthe active surface is the main cause for the decrease of the CEM gain through the life-test.The thick-ness of contaminating carbon layer is approximately 50(?).In order to improve CEM’s bake-resist-ing property,we have also studied the effects of the baking temperature on the gain and FWHM,and the relationship between the baking temperature and the reduction temperature.We find,under thecondition of keeping the resistivity constant for a period of time,the higher the reduction temperature is,the higher the bake-resisting temperature will be.
A method to test the stability of high lead glass CEM is given and some results are obtained, the life-test datum with an accumulative count about 10 ~ (11) is obtained; the structure and composition of active surface of fatigued CEM are analyzed by using AES, We find the increase of carbon on the active surface is the main cause for the decrease of the CEM gain through the life-test. The thick-ness of contaminating carbon layer is approximately 50 (?). In order to improve CEM’s bake- resist-ing property, we have also studied the effects of the baking temperature on the gain and FWHM, and the relationship between the baking temperature and the reduction temperature. We find, under the condition of keeping the resistivity constant for a period of time, the higher the reduction temperature is, the higher the bake-resisting temperature will be.