Tenfold Speed Accelerator for Resistive Anode Imaging and Optical Anode Alterative

对于低强度电子束、离子束或光子束的成像或位置灵敏检测(粒子计数)，通常的方法是使用微通道板(MCP)增强器(必要时带有适当的发射涂层或光电阴极)，然后使用位置灵敏阳极。在几种可能的阳极设计中，阻性阳极编码器(RAE)已被证明是坚固耐用、廉价且非常有用的一种，特别是当单个颗粒到达的时间很重要时。该器件目前的局限性包括由于RC延迟和电子处理时间导致的最大计数速率有限，以及在现场真空应用中需要在信号引线上使用高电压真空馈通和容易击穿的支架电容器，其中阳极必须偏置到高电压。新一代快速RAE型探测器将被开发出来。提出的新的脉冲处理电子学，也适用于现有的RAE设备，应该会将信号速率提高到电流探测器的十分之一。新的探测器将用它的光学模拟来取代阻阳极，使用闪烁的光导将电子脉冲转换为光脉冲，这些光脉冲可以通过光纤信号线传输。其优势包括固有的高速、抗噪性，以及允许探测器在高电压下浮动的非导通信号引线。

For imaging or position-sensitive detection (particle counting) of low-intensity electron, ion, or photon beams, a common approach is to use a microchannel plate (MCP) intensifier (with an appropriate emissive coating or photocathode if necessary) followed by a position-sensitive anode. Of several possible anode designs, one which has proven to be rugged, inexpensive, and very useful, particularly when timing of individual particle arrivals is important, is the resistive anode encoder (RAE). Present limitations of this device include limited maximum counting rate due to RC delays and electronic processing times, and the need to use high voltage vacuum feedthroughs and breakdown-prone standoff capacitors on the signal leads for in-situ vacuum applications where the anode must be biased to high voltages. A fast new generation of RAE-type detectors will be developed. Proposed new pulse processing electronics, applicable to existing RAE devices as well, should increase the signal rate over that of current detectors by a factor of ten. The new detector would replace the resistive anode with its optical analog, using a scintillating lightguide to convert an electron burst into optical pulses, which can be transmitted over optical fiber signal leads. The advantages include inherent high speed, noise immunity, and non-conducting signal leads that allow the detector to float at high voltage.