Picosecond Time Response Characteristics of Micro-channel Plate PMT Detectors

Citation

"Picosecond Time Response Characteristics of Micro-channel Plate PMT Detectors," by J. Milnes and J. Howorth, details the effect of the number and design of micro-channel plates (MCPs) on output pulse characteristics. Contact information for the authors is available at james.milnes@photek.co.uk or by phone at +44(0)-1424-850555.

 

Brief

The authors found that the fall time performance of MCP-based PMT detectors is critically affected by the 50Ω transmission line delivering the pulse from the anode and that their best-performing PMT (the PMT210) has a near-ideal TDR trace resulting in rise and fall times of 122ps and 167ps, respectively, and a pulse FWHM of 193ps.

Summary

The rise time of MCP-based PMT detectors is mainly controlled by the variation in transit time through the MCP pores and the difference in exit velocity from the MCP stack. The size and bias angle of the MCP pores affect the variation in transit time through the MCP pores more than the number of MCPs. Increasing the electric field from the MCP to the anode can significantly reduce the spread of the rise time caused by variations in the exit velocity from the MCP stack. The 50Ω transmission line delivering the pulse from the anode significantly affects the fall time performance. A PMT210 has nearly ideal performance with a 122ps rise time, a 167ps fall time, and a 193ps pulse FWHM.

Origin: https://hep.uchicago.edu/psec/MCP_info/Photek_timeresponse.pdf

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