紫外微通道板型光电倍增管研制及性能研究

紫外光电倍增管是紫外告警系统和紫外光通信的关键探测器件,紫外微通道板型光电倍增管具有高灵敏度、高增益、高分辨率、低噪声等特点,且体积小、耐冲击与振动,但国内紫外光电倍增管起步较晚,产品技术性能薄弱,故紫外微通道板型光电倍增管的研制及性能研究迫在眉睫。本文中的紫外微通道板型光电倍增管采用端窗式结构、MgF2材料作为光窗、Cs2Te阴极作为光电转换阴极,可实现200 nm^300 nm"日盲"紫外波段的探测,倍增极使用高增益双通道板叠加结构,在电压较低的情况下可以实现约5×10^6倍增能力,从而提高了紫外光电倍增管的单光子探测能力。文中简要介绍了紫外光电倍增管的应用以及同种管型国内外的发展现状,研究紫外光电倍增管的测试方法,对自主研发的光电倍增管进行了性能评估和数据分析。结果表明,紫外微通道板型光电倍增管阴极辐射灵敏度较高,同时对单光子具有较好的响应,相对国外同类型的产品,具有高增益、高峰谷比、高分辨率等优点。

Study on the Performance of an Ultraviolet Microchannel Plate Photomultiplier

Ultraviolet(UV)photomultipliers are key detectors in UV warning systems and communication.The UV microchannel plate photomultiplier tube(MCP-PMT)has the merits of high sensitivity,high gain,high resolution,low noise,small volume,and vibration resistance.However,the UV photomultiplier was invented too recently,and its technical performance is weak.Thus,further development and performance studies of the UV MCP-PMT has attracted increased attention.In this paper,a UV MCP-PMT using an end window structure is discussed.MgF2 and Cs2Te are used as the light window material and photocathode material,respectively.The UV MCP-PMT can detect the"day blind"UV band from 200 to 300 nm.A high-gain double channel plate structure is adopted.The device has a multiplication ability of approximately 5×10^6 under low voltage,thus improving the single photon detection capability of the UV MCP-PMT.This paper gives a brief introduction of the applications of UV MCP-PMT and the development of this type of photomultiplier in China and foreign countries.The test method of UV MCP-PMT is studied.The performance of the self-developed photomultiplier is evaluated,and the obtained data are analyzed.The results show that the MCP-PMT has high cathode radiation sensitivity with good response to single photons.Compared with the same type of products abroad,this design has the advantages of high gain,high peak valley ratio,and high resolution.