patrick.thomas@LIGO.ORG - posted 18:13, Wednesday 06 July 2016 - last comment - 19:52, Wednesday 06 July 2016(28205)
Ops Status
Jenne, Sheila, Keita, Peter and Jason are here. The work in the PSL enclosure has completed for now. The IFO has made it to DC readout twice, but lost lock on increase power. Keita and Sheila are taking measurements related to the FSS.
Comments related to this report
sheila.dwyer@LIGO.ORG - 19:52, Wednesday 06 July 2016 (28207)
The first attachment is an IMC OLG measured with the FSS common gain at 16dB, with something unstable at around 200 kHz. The second attachment is with a common gain at 20dB, which gives us about 4dB of gain margin at 200kHz. We have left the FSS like this and the IFO was able to power up to 40 Watts. Data attached is for the state we are leaving it in, FSS fast gain 22dB, common gain 20 dB, IMC in1 gain 16 dB at 2 Watts.
If the operators have trouble getting the FSS to relock after a lockloss they can try reducing the common gain, and then setting it back to 20dB once it is locked.
The first attachment is an IMC OLG measured with the FSS common gain at 16dB, with something unstable at around 200 kHz. The second attachment is with a common gain at 20dB, which gives us about 4dB of gain margin at 200kHz. We have left the FSS like this and the IFO was able to power up to 40 Watts. Data attached is for the state we are leaving it in, FSS fast gain 22dB, common gain 20 dB, IMC in1 gain 16 dB at 2 Watts.
If the operators have trouble getting the FSS to relock after a lockloss they can try reducing the common gain, and then setting it back to 20dB once it is locked.