The electron's velocity direction through the magnetic mirror field for the low-light imaging system

Abstract

In order to improve the detectability of low-light imaging CCD (charge coupled devices), we have brought forward a magnetic mirror device to apply to microchannel electron vase plate ((MEVP)) of low-light imaging system at room temperature. After introduced the principle of restricted electron in magnetic mirror field to accumulate enough time for low-light CCD imaging, magnetic intensity has been calculated discretionary position in the mirror, the formula of electron's velocity direction has been given through the throat of magnetic mirror in this paper. The educed electron's angle distribution between velocity direction and magnetic mirror axis has been simulated at 7-10 degree. This answers for the design needs of microchannel vase plate now. The electron's loop speckle imaging has been obtained by experiment; the result is same as theoretical value. It is proved that if the electrons educed by the magnetic mirror field at the same cone angle and approximate speed, the gain of microchannel plate will be more stable, so that it is favorable to reduce the noise of photoelectronic imaging.