KAGRA Logbook

Everything got back. Now, I feel much better and I could some IFO experiment.
The detail is as follows:

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The ALS DARM could be locked as we have locked before, although I'm not sure what was the good treatment. I and Yamamoto-sensei suspect that the PC had some problem because of the problem we had when we reboot it.

After locking the ALS DARM, the 11.1 Hz vertical mode started to be excited. I put the BPCOMB filter.

Also, I found that the L2Y coupling in low frequency is not really good. I tweaked drive align matrix by using the TMSY TRANS QPD. It seems a better way to do the actuator diagonalization.
I put excitation signal at MN_LOCK filter at 0.2 Hz with the amplitude of 10000 or more and tweaked the non-diagonal component in the drive align matrix so that the QPD don't have a signal at 0.2 Hz by looking the time series. I think the yaw could be diagonalized very well, but the pitch is not really. Also, I re-diagonalized yaw oplev signal by that excitation signal.

From the ALS DARM lock stability, the new drive align matrix seems better. However, I just did quick adjustment and no measurement, so it might be good to check by VIS folks.

Then, I tried to lock the PRMI by using the AS_DC signal for the valuable finesse scheme. I could hold it when the arm cavity is close to the resonance, and I could lock the CARM by using the TR CARM signal for a while. The CARM offset is still kind of large, but I feel we can bring it on resonance after several trials.

I modified the model to put the band-limited RMS calculator for the error signals of all DoFs. It is for the guardian to lock the PRMI with the normalized AS_DC signal.