Microchannel plates for the UVCS and SUMER instruments on the SOHO satellite
Microchannel plates for the UVCS and SUMER instruments on the SOHO satellite
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SOHO 卫星上 UVCS 和 SUMER 仪器的微通道板
DOI：
10.1117/12.218388
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
J. Vallerga
中科院分区：
文献类型：
--
作者：
O. Siegmund;M. Gummin;T. Sasseen;P. Jelinsky;G. Gaines;J. Hull;J. Stock;M. Edgar;B. Welsh;S. Jelinsky;J. Vallerga
本文介绍了将于1995年下半年发射的太阳轨道日光层观测使命上的SUMER和USCHE探测器的微通道板。微通道板（MCP）的低电阻Z堆叠以27 mm乘以10 mm的检测器格式使用具有1024乘以360数字化像素的多层交叉延迟线阳极（XDL）。MCP堆叠在均匀泛光照明下提供大于2乘以107的增益，具有良好的脉冲高度分布（低至25%FWHM）。本底率约等于0.6事件cm-2 sec-1，获得这种配置。本地计数率高达约等于800事件/像素/秒已实现的MCP增益下降很少。MCP预处理的结果进行了讨论，表明一些MCP堆栈未能有增益下降时，受到高通量的UV擦洗。此外，虽然裸MCP量子效率接近那些预期（约等于10%），我们发现，KBr光电阴极的长波长响应可以大大增强MCP擦洗过程。平场图像的特征在于低水平的MCP固定图案噪声并且是稳定的。显示了仪器的初步校准结果。
The microchannel plates for the detectors in the SUMER and UVCS instruments aboard the Solar Orbiting Heliospheric Observatory (SOHO) mission to be launched in late 1995 are described. A low resistance Z stack of microchannel plates (MCPs) is employed in a detector format of 27 mm multiplied by 10 mm using a multilayer cross delay line anode (XDL) with 1024 by 360 digitized pixels. The MCP stacks provide gains of greater than 2 multiplied by 107 with good pulse height distributions (as low as 25% FWHM) under uniform flood illumination. Background rates of approximately equals 0.6 event cm-2 sec-1 are obtained for this configuration. Local counting rates up to approximately equals 800 events/pixel/sec have been achieved with little drop of the MCP gain. MCP preconditioning results are discussed, showing that some MCP stacks fail to have gain decreases when subjected to a high flux UV scrub. Also, although the bare MCP quantum efficiencies are close to those expected (approximately equals 10%), we found that the long wavelength response of KBr photocathodes could be substantially enhanced by the MCP scrubbing process. Flat field images are characterized by a low level of MCP fixed pattern noise and are stable. Preliminary calibration results for the instruments are shown.