DRAFT SO FAR

remember Grant’s email about taking apart the failed shutter

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Introduction

A DB15 cable….

This LED is pointed at the fiber block within the HK spectrometer to back-illuminate the fibers. This allows the HK fiber viewing camera in the FIU to determine the locations of the HK fibers.

The LEDs are turned on and off at the PDU outlet using kpfpower for the appropriate outlet.

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Grant Hill took the failed shutters apart, and noted that:

“At first I thought I saw molten slag but maybe that is just epoxy holding components in place? No burnt smell. The coil is hair thin wire but each end seemed intact and was still connected. In the pictures they are broken off because that was what it took to open it up. One of the pictures shows how you can only open it up a little way without breaking the wires.

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When I looked under magnification I saw breaks in the coil wire part way round the loop so guessing that was the failure mode. I picked at one break to make it more visible. On the other shutter it appears that a strand of coil wire is visible glommed onto a component (a cap?).”

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Description

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