Reports until 12:00, Thursday 30 July 2015
H1 CAL (CAL)
richard.savage@LIGO.ORG - posted 12:00, Thursday 30 July 2015 - last comment - 18:56, Thursday 30 July 2015(20063)
Switching off the 157.9 Hz Yend Pcal calibration line

Based on discussions during the Calibration Committee call today, we decided to eliminate the 157.9 Hz low-SNR calibration line.

We switched off the excitation which was in the OSC2 position.

So we are now driving at 36.7 with SNR of about 100 for calculating the actuation correction, kappa_A (see LIGO-T1500377), and 331.9 Hz with SNR of ~100 for calculating the sensing correction, kappa_C, and f_c, the cavity pole.

We are also driving at 1083.7 Hz with an SNR of about 40.

All SNRs quoted are with 10-second FFTs.

As soon as we inspect and tune up the Xend Pcal, we plan to start an excitation at 3001.3 Hz with a relatively low SNR (all that we can achieve at this high frequency).

LLO will run lines spaced within 1-2 Hz of hte LHO lines.

This is our current plan for the Pcal lines for the O1 run.

Comments related to this report
kiwamu.izumi@LIGO.ORG - 18:56, Thursday 30 July 2015 (20075)

Since we now do not use the pcal line at 325.1 Hz, I took out the corresponding notch (alog 19839) from LSC-DARM while I left a notch for the one at 331.9 Hz in FM7.