keita.kawabe@LIGO.ORG - posted 13:32, Thursday 27 January 2022 - last comment - 14:15, Thursday 27 January 2022(61487)
New DCPD preamp works. DCPD_B is the one that sees the reflected beam as of now (Daniel, Betsy, Keita)
I used a flashlight (through the OMC breadboard) to aim at the DCPD in reflection of the 50:50 BS as best as I can , and DCPD_B showed much stronger signal.
This means that:
- DCPD preamp and whitening chassis work.
- DCPD_B is the one that sees reflection as of now, DCPD_A is receivning the transmission.
See cartoon, this is a top view looking through the glass OMC breadboard (optical components are under the breadboard).
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Wiring diagram is here D1900511-v7 with ISC-R5 on pg 21.
The O3 DCPD chain is documented here, D1300502, which also shows A in transmission and B in reflection.