This morning, the SNEB minitower has been vented and the following activities performed:
- Change the splitter in front of the camera by the nominal 99.9% instead of 90%
- Change the B7_PD2 photodiode to get an preamplifier able to stand 50 mW instead of the previous 12 mW
- Replace the RF cable of the B7_PD1 photodiode which was not working properly
- Restore the correct name of the RF photodiode channels (PD1 and PD2 were swaped)
- Change the ADC channel used for the demodulation of the B7_PD1 from 3 to 1 (although the observed problem was maybe coming from the bad cable)
- Change the timing DAQbox cabling. Now, the bottom DAQbox is receiving first the timing and then send it to the top DAQbox.
- Replace the B7_Cam2 camera (its air box was leaking)
- Tighten some of the LVDT supports
- A test of the transmission of the feedtrough (test made with Eric and Gabriel). The transmission of the 633 nm feedthrough plus the four meters fiber was around 15% for a 8 mW beam.
Then the minitower was closed and pumped down (starting from 14:15 UTC).
The recovery of the local control due to the thermic transient and possible reference change, is in progress.