ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
We present results on the image distortion or "modulation'' produced when a wedge and strip anode (WSA) position readout is used with a charge cloud of size comparable with that of the pattern repeat pitch. We use a standard detector consisting of a microchannel plate (MCP) intensifier and wedge and strip anode to investigate the effect of detector operating parameters on image modulation. We find that modulation depends on the MCP gain of each event and on the MCP voltage, and is minimized when the plates are run at high gains and with high rear MCP operating voltages. We compare the experimental results obtained using this detector with the response calculated numerically in a computer simulation. From the simulation it becomes apparent that for a detailed understanding of wedge and strip performance the microchannel plate charge cloud distribution must be considered. However, some of the general features of the wedge and strip anode performance are independent of the charge cloud form. The most important of these is that modulation distortion displaces a vertical line (parallel to the direction of increasing wedge) to another vertical line, while a horizontal line (parallel to the direction of increasing strip) is distorted into a wave-shaped curve with the periodicity of the pattern pitch.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1140502
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