As planned (see alog from yesterday), I restored the POP path on ISCT1. The POP beam is now detectable with both POPAIR_A and POPAIR_B. Also, I did some clean up on the table.
Here are summary of the work:
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Moved the POP camera from the temporary position to the permanent one.
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Realigned the bottom periscope of the POP path. It needed a slight touch in yaw.
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Took out a BS which was intended for a measurement of Doppler noise for ALS comm.
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Put it in a stash in the squeezer bay.
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Centered the beam on POPAIR_A and POPAIR_B
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Increased the gain for the DC signal of POPAIR_B by a factor of 10 as the signal was puny.
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This was done by toggling the mechanical switch on the front panel of the generic PD interface box.
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Cleaned up apparently-not-in-use optics and put them in the stash in the squeezer bay.
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Moved the REFL PD camera back in place and focused it.
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This is the one which had been used for monitoring green light for ALS temporarily.