柱面微通道板的制备及其性能研究

The fabrication and properties of cylindrical microchannel plate

针对未来空间天文学应用的超分辨率光谱成像仪器的需求,对低噪声柱面微通道板(MCP)的制备方法及其性能进行了研究.提出了一种将光学抛光与热成型相结合的新的柱面MCP制备方法,利用不含放射性元素的低噪声MCP玻璃,制备出曲率半径为400 mm、尺寸为30 mm×46 mm、长径比为80:1、通道直径12.5μm、通道间距15μm的柱面MCP,并将其与感应电荷楔条形阳极(WSA)组成光子计数探测器,对其暗计数率、分辨率进行了检测,暗计数率约为0.1 counts/cm^2·s.

In order to meet the needs of super-resolution spectral imaging instruments in future Chinese space astronomy applications,the fabrication method and performance of low noise cylindrical microchannel plate(MCP)were studied.A new method for preparing cylindrical MCP by combining optical polishing with thermal forming is proposed.Using low noise MCP glass without radioactive elements,cylindrical MCPs with curvature radius of 400 mm,size of 30 mm×46 mm,length-diameter ratio of 80:1,channel diameter of 12.5μm and channel spacing of 15μm is fabricated.A photon counting detector with inductive charge wedge-strip anode(WSA)and cylindrical MCP stack was constructed.cylindrical MCP stack dark count rate and resolution were measured.The dark count rate was about 0.1 counts/cm2·s.