Mechanical Prototype / optical considerations
1. Current LED system performance
1. New APD / Fiber /Strong Back integration scheme
LED Calibration and Monitoring System
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Optical router for 12 LED pulses for the 12 Modules in a strip module
Module gain monitoring signal compared to cosmic ray peak
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Recent Improvements: Last measurement of LED signal from the tower with 0.5 mm fibers corresponds to ~4 GeV electrons For the test beam prototype, increase diameter of secondary fibers up to 0.75 mm and use a jacketed fibers to increase isolation. optical Estimated improvement ~2 times. New LED board up a signal ~2 times. (Hans Schedule ??) Goal is to have LED system capable of ~ 16 GeV pulses
New APD/Fiber/Strong Back integration scheme.
Old APD/Fiber/Strong Back integration scheme.
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Leaf spring
Three proposed variants of new APD/Fiber integration scheme. Deeper cavity variant adopted
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