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:

• Moved the POP camera from the temporary position to the permanent one.
• Realigned the bottom periscope of the POP path. It needed a slight touch in yaw.
• Took out a BS which was intended for a measurement of Doppler noise for ALS comm.
  • Put it in a stash in the squeezer bay.
• Centered the beam on POPAIR_A and POPAIR_B
• Increased the gain for the DC signal of POPAIR_B by a factor of 10 as the signal was puny.
  • This was done by toggling the mechanical switch on the front panel of the generic PD interface box.
• Cleaned up apparently-not-in-use optics and put them in the stash in the squeezer bay.
• Moved the REFL PD camera back in place and focused it.
  • This is the one which had been used for monitoring green light for ALS temporarily.