A High Gain Hybrid Photomultiplier Tube Based on Microchannel Plate

Abstract

The invention relates to a high-gain hybrid photomultiplier tube based on a microchannel plate. A microchannel plate MCP is placed behind the photocathode to amplify the photoelectrons generated by the photocathode, and the amplified electrons are processed under an applied voltage. Acceleration, and the trajectory is constrained by the focusing pole to ensure that high-energy electrons can bombard the wide-bandgap semiconductor detector. The photocathode can be loaded with 6000V‑20000V negative high voltage, and the voltages on the photocathode, MCP and focusing electrode can be flexibly adjusted according to the needs by using the ratio between the three voltage dividing resistors in the voltage dividing circuit, so as to realize the adjustment of gain and time characteristics . The gain of the hybrid photomultiplier tube of the present invention is not only limited to high gain, but also can realize a wide gain range (10 2 -10 6 ) to meet different gain requirements.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, and relates to a high-gain hybrid photomultiplier tube based on a microchannel plate, which can be used for researches such as pulse radiation measurement and single particle detection. Background technique [0002] Scintillator-based detection methods have been widely used in radiation detection, spectroscopy research and other fields, and have made outstanding contributions. This is entirely dependent on the photomultiplier tube being able to convert and amplify the weak pulsed flash signal generated by the scintillator excited by radiation into a measurable electrical signal. Although semiconductor diodes are also used for the luminescence measurement of scintillators, the photomultiplier tube is still the most widely used device. Due to the wide statistical distribution of the pulse output amplitude of the traditional photomultiplier tube, the pulse amplitude spectrum measured by t...

AI Technical Summary

Problems solved by technology

In order to further increase the magnification of the hybrid photomultiplier tube, one is to increase the applied voltage value infinitely, which is obviously impractical; the other is to change the structure of the back-end semiconductor device, such as using an avalanche diode to further amplify the number of electrons , but because avalanche diodes are mostly made of silicon materials, they usually have large dark noise and poor radiation resistance, and their performance will deteriorate after long-term use, which is not conducive to maintaining the excellent performance of hybrid photomultiplier tubes.

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