camilla.compton@LIGO.ORG - posted 12:32, Tuesday 21 February 2023 (67409)
SQZ Cabling Swap for FC lock on IFO or Homodyne.
Vicky, Camilla. Cabling swap at the SQZ Rack and SQZT0 required to change between locking filter cavity to the IFO or the homodyne (useful when the IFO is offline). This was changed by Dhruva, Naoki, Vicky in alog 67273 and we reverted to nominal 8th Feb.
FC-HD locking configuration:
- FCGS FC green CMB fast output (R1 U34) connected to Sqz laser VCO Tune (R2 U18/19)
- DAC output Dsub 1 1A (R1 U15) connected to FCGS VCO tune (R2 U30/31)
- Lo servo fast output (R1 U16) connected to LO PZT driver channel 2 (R1 U14)
- SQZT7 patch panel LO fiber connected to SQZT0 SQZ laser LO fiber (from SQZT0 SQZ laser).
- SQZ_FC GRD can be manualled to IR VCO LOCKED
Nominal FC-IFO configuration:
- Lo servo fast output (R1 U16) connected to Sqz laser VCO Tune (R2 U18/19) via cable "ISC Sqz 210".
- FCGS FC green CMB fast output (R1 U34) connected to FCGS VCO fast tune (R2 U30/31) via cable "ISC Sqz 456".
- SQZT7 patch panel LO fiber connected to PSL-LO. (Needed as there is too much noise in PSL fiber without locking from the IFO.)