Scott L. Ed P. Cleaned 33.5 meters of tube ending 8.4 meters north of HNW-4-066. Cleaning crew left at noon, both feeling ill. A total of 3297 meters of tube cleaned to date.
With help from Betsy and Corey, and confirmation from Kiwamu and Hugh's alog, I cleared the IMC-DOF offsets - confirmed as a change from Robert's work and working well.
I also turned the OMC-ASC_DITHER_MASTER off.
I don't see any of the alogs I posted last night. I can see them if I search myself, and they show up, but they aren't showing up in the alog. BUG!!!
I see yours show up on page 2. There have been a bunch of replies posted to various entires today, so the top-level entries get bumped up to the first page (even if they have a lower alog number than some of the top-level entries on the second page). I agree it is not a very straightforward behavior.
Hannah, Stefan We quickly looked at the pretty dramatic 5Mpc (10%) range drop that occurred at 10:07 UTC on 2015/06/05. Attached are DARM spectra for 09:30 UTC (good reference, black) and 10:07 UTC (bad reference, red). We did loo for coherence with MICH_OUT and SRCL_OUT at both good and bad times, but none showed any significant coherence in the 40Hz to 150Hz frequency band. Neither do ISS_PDA or ISS_PDB.
I restarted daqd on h1broadcast0 at 13:01 PDT. Very soon afterwards all the DMT monitors started running again and we now have Sensemon and SeisBLRMS plots updating again in the control room.
H1 was locked and in science mode during the DMT outage.
here are the times when the H1 operator intent bit was set while the DAQ broadcaster was not serving data:
18:38 - 18:42 UTC
19:26 - onwards until broadaster restarted at 20:01
In the spirit of full disclosure, I'm setting the HIGH alarm level on the H1:CAL-INJ_EXTTRIG_ALERT_TIME EPICS channel (hosted by the front end model h1calcs) to see if I can use the EPICS alarm handler to audibly alert the operator of a GRB. I'm also setting the HSV alarm severity.
Some LHO DMT monitors are not running. John and Maddie have been emailed about the problem. There is no CAL SENSEMON or SEIS BLRMS data at the moment from H1.
Looks like the DAQ broadcaster has stopped sending data. Its EPICS IOC is still running, but the EPICS values are frozen. There are no recent logs in the log files. We have not seen this failure before. CPU and MEM looks good on the machine.
We should discuss restarting the broadcaster (will not affect the rest of the DAQ)
Back to commissioning at 17:57 - glitches in ETMY causing range to drop to zero.
The improvement of 3 or 4 in peak height and a few Mpc seems to have held for at least a few hours, so I attach before and after spectra. Two hours was not much time for this tuning considering that settling time was several minutes. When possible, I would like to try, for example, adjusting some of the other degrees of freedom (we adjusted only 1 of 3).
The MICH feedforward path into DARM has been retuned, since Gabriele recently found a nontrivial amount of coupling from 50 to 200 Hz.
First, the MICH → DARM and MICHFF → DARM paths were measured according to the prescription given here. Then the ratio of these TFs was vectfitted and loaded into FM4 of LSC-MICHFF. This is meant to stand in place of FM5, which is the old frequency-dependent compensation filter. The necessary feedforward gain has been absorbed into FM4, so the filter module gain should now be 1. These changes have been written into the LSC_FF state in the Guardian.
The attachment shows the performance of the new retuning compared to the old retuning. At the start of this exercise, I had already changed the FM gain of the "old" retuning from 0.038 (in the Guardian) to 0.045, as this removed a lot of the coherence near 100 Hz.
Also, I had previously widened the violin stopband in BS M2 L, but had not propagated this change to the analogous filter in LSC-MICHFF. This is now fixed. Also note that if any change is made to the invBS compensation filter in BS M3 L, this change must be propagated to LSC-MICHFF as well.
I did not have time to implement SRCL feedforward. I suspect it would be a quick job, and could be done parasitically with other tweaking activities.
Coherence between MICH and DARM before and after Evan's work. (As far as I can tell, yes, DARM got better and the range improved..although it is not evident from the SNSH channel, as it had problems around the time of Evan's work.) Let's see how much this coupling changes over time.
The LSC-MICHFF_TRAMP is now set to 3 versus the snap setting of 5 sec. This shows in the LSC SDF diff Table now and should be reverted or accepted, Evan?
Snap setting of 5 seconds is probably better.
I injected pitch (270 Hz) and yaw (280 Hz) lines with the PSL piezo mirror and then tried to minimize them in DARM by adjusting values of the offsets of DOF2P and DOF1Y of the IMC WFS. It was a bit tricky because of ten-minute alignment time scales. But we reduced the injected pitch peak height by a factor of 2, and the yaw by 5 (we cared most about yaw because the PSL jitter peaks are mainly in yaw). The inspiral range increased by a few Mpc and the jitter peaks seemed down by a factor of a few, but I will wait until tomorrow to put in spectra in order to be sure that the improvement is stable. DOF2P was changed from 135.9 to 350 and DOF1Y from 47.5 to 200. I think we could do better with another 2 hours.
Robert, Kiwamu, Evan
This change now shows in the ASCIMC SDF Table.
Something is not healthy on SR2 suspension.
Recently we noticed that some DAC on SR2 suspension saturated intermittently at a rate of roughlu once per 10 minutes or so. At the begginig we thought this was due to some ISC feedback saturating some DACs when we lock the interferometer. However, it turned out that it saturates even when no ISC feedback is sent.
The attached is a one-hour trend of all the saturation motniors of the SR2 top stage actuators from the period when SR2 was aligned and damped without any ISC feedback signals yesterday. As seen in the plot, the RT and LF DACs saturated mutiple times. The LF saturated more frequently than the RF actuator. Looking at the suspension screen, Betsy and I found that the longitudinal dampig showed higher signal level at its output than every one else. It is on the order of 100 counts at the output. Betsy is currently checking the longitudinal damping loop by running a transfer function measurement.
I ran a damped L (longitudinal) loop TF which looks "healthy" when compared to previous TFs - so nothing agregious there. However, we note that we do not have a lot of damping in any of the H1 HSTS L loops as observed from looking at the other HSTS L TFs. Also the L loop output seems to be doing more work (higher numbers rolling through) than other L loops. We started looking at filter diffs in the L loops and see that in some HSTSes we have the FM10 Ellip50 engaged. We engaged this filter and see that the L loop output became much quieter (closer to zero). Kiwamu wants to see if this will improve the saturations of SR2 and imprve locking. Attached is a quick damped TF of SR2 M1 DAMP L with the FM10 engaged, as well as a screen snapshot.
For some reason, the elliptic filter that we installed at FM10 of the longitudinal damping loop was taken out on 2015-June-2 18:00. SR2 seems to be saturating again. Sad.
And then again...
Actually, Dan would like the OMC Dither enabled as a monitoring point, and maybe use the dither alignment, so the agreemeet with Kiwamu and Dan was that we'd turn the dither on, and acept it in the SDF.
OMC Dither = ON is now acepted in SDF, and SDF overview is again all green.