Attached is a plot of the high power oscillator diode currents prior to its shutdown over two years ago. These are the currents that the high power oscillator will be restored to. DB1 51.3 A DB2 49.7 A DB3 50.8 A DB4 49.0 A
ITMY ring heater was left on for an overnight measurement. The upper and lower segments of the ring heater were set to 1 W (i.e. 2W in total). The interferometer is aligned but in the down state. I started the HWS codes on h1hwsmsr because they were not running. I have not updated the reference images for the HWS codes this time. Therefore they use whatever the reference images that are in ~/temp/. The ring heater will be automatically switched off at around 6 am in local time by a script running on opsws4.
The HWS code should have been running in a single tmux session containing two windows. Clearly this is too easy to circumvent. I'll talk to Jamie about seeing if we can get this set up as a daemon process instead with the new version of the code.
JimB and I are working on this issue at the moment. We are trying to get rid of tmux sessions by implenting monit. As of yesterday, we succeeded in running the hartman codes under the managmenet of monit. The implementation is still underway and about 80% done at the moment.
We are having a trouble with the CO2 Y laser where every time when we request an angle to the rotation stage, it trips the laser for unknown reason. According to the MEDM screen, "RTD/IR SENS. ALARM" turns in red when we request an angle to the rotation stage. We needed to hit the gate button at the floor in order to untrip the laser. If we do not change the rotation stage angle, the laser seems to stay on,
We need help from experts.
Fixed.
It was loosely connected D-sub calbes. I went to the floor and was going to inspect the controller box as suggested by Alastair. However, it turned out that tightening up all the D-sub cables on the front panel of the controller box apparently fixed the problem. I did not even try to reproduce the issue.
Jenne, Sheila, Kiwamu, Hang, Stefan
We tried to monitor the AS WFS gains during powerup. However, we didn't see any sign flips. Nevertheless, a combination of SOFT and SCR1 loops ran away anyway.
On the next attempt we again observe the onset of a 0.4Hz oscillation in pitch, which, depending on alignment, starts around 13W-15W, and grows until lock-break.
Jenne tried to move the soft offsets around to see whether there are alignments that are less suceptible to the 0.4Hz oscillation - not much luck.
Looking at the OPLEVs we noticed that mostly the xarm pitch is moving during power-up (but too slow for radiation pressure effects). Note that during this the soft loop error signals are kept zero, which suggests some non-linearity in the X QPDs.
One last attempt: We opened the SOFT loops, then went to 10W. We still get our "favorite" oscillation. We'll look at some lockloss plots when we're more awake.
Prompted in part by the day that the vacuum team needed an extra TV for remote medm screen monitoring, we have thought a bit about where we really want some of our FOMs displayed, and which ones belong where.
The range integrand is useful, but perhaps not something that we need to be watching in realtime. I have promoted the ASC control signals (previously on the top monitor of video0) to the place where the range integrand was, at the bottom of nuc6. Since I can't directly access the bottom screen, the striptools are kind of mushed right now, but if someone can get them nicely displayed on nuc6, that'd be great. These are the same {userapps}/isc/h1/scripts/[PITCH or YAW]_ASC_CONTROL_SIGNALS.stp strip tool templates that were formerly on video0.
Rather than putting the range integrand on video0, I have put the ASC error signals up on video0, since we occassionally want to see these. The color scheme is the same as the control signals, although the backgrounds are slightly different colors to indicate that they're not quite the same (err vs. ctrl signals). We may need to think more on the y-scales - right now I have them optimized for in-lock, so they're rail-to-rail while we're unlocked. We may want to zero the input matrices in the DOWN state and then re-write them before use, to make these strip tools less crazy. These templates now live in {userapps}/isc/h1/scripts/[PITCH or YAW]_ASC_ERROR_SIGNALS.stp.
JimB will update the labels on the screen capturing webpage in the morning to reflect these changes. Thanks Jim!!
The control room screen shot web page has been modified, and the nuc6 computer has been configured to automatically start the strip tools when rebooted.
Kiwamu, Jenne, Stefan
With the ASC fully engaged at 2W, we wanted the see how it behaves at higher powers. Up to 10W the behavior was fine, then we started loosing recycling gain.
During this sequence we dithered BS in pitch and monitored its sensor, ASB36Q_PIT. We monitored this channel because this was running away in the O1 configuration (alog ). However it was not the culprit.
Posted below are the past 10 day trends. The WeeklyXtal trends reflect the ongoing "beginning of the end" of th FE amplifier diodes with a confusing upwards twist (most recently) which I've queried Peter about as his last aLog also shows this ( https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=26154 ) but he made no comment about it. The WeeklyEnv trends shows a seemingly sizeable(?) drop in Relative Humidity between the 14th and the 20th. Curious that the curve is practically identical for the Laser and Anteroom as it is for the Diode and Chiller rooms given the distance between them.
Both EX and EY pump pressure have a big glitch on Feb 23 at 21:26 and 22:49 UTC. There were Guardian restarts going on around that time (alog25679 and alog25684). Average HPI-PUMP_L0_CONTROL_VOUT went up by ~10 counts on Feb 16. HPI-PUMP_EY_CONTROL_VOUT abd HPI-PUMP_EY_PS_PRESSI are glitchy and HPI-PUMP_EX_CONTROL_VOUT has been rising slowly. HPI-PUMP_L0_PS1, 2, 3, 4 pressures are flat (they look unreal).
Closed FAMIS #4518
TITLE: 03/21 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
Wind: 24mph Gusts, 17mph 5min avg
Primary useism: 0.08 μm/s
Secondary useism: 0.30 μm/s
QUICK SUMMARY:Commissioning going on.Guests in the control room include; Jaime, Terra and Stefan
Activity Log: All Times in UTC (PT) 15:00 (08:00) – Start preparing the IFO for relocking. 17:00 (10:00) HFD will be doing prescribed burning to the NW of the site 17:01 (10:01) Bubba – checking on tumbleweed accumulation in desert between the arms 17:17 (10:17) Richard, Jenne, Hang – Going into LEVA to look at camera pointing 17:24 (10:24) Kiwamu & Patrick – Going into the CER to check the TCS-X Beckhoff 17:28 (10:28) Christina & Karen – Cleaning up at End-Y after grouting work 17:30 (10:30) Stefan – Going into LVEA to work on camera pointing 17:45 (10:45) Reboot Video4 to fix frozen displays 18:04 (11:04) Bubba – Back from the desert 18:05 (11:05) Grout work is finished at End-Y and in the LVEA 18:15 (11:15) Rick – Taking tour through LVEA 18:20 (11:20) Sheila & Jeff – Transition LVEA to laser hazard 18:30 (11:30) Rick – Taking tour to roof top observation deck 18:33 (11:33) Nutsinee – Recovering parts from the LVEA 18:55 (11:55) Rick – Off the LVEA roof 19:00 (12:00) Hugh – Going into the LVEA 20:40 (13:40) Travis – Going into Optics Lab 20:45 (13:45) Sheila – Going into LVEA to replace VP covers 20:50 (13:50) Sheila – Out of LVEA 20:52 (13:52) Travis – Out of the Optics Lab 21:08 (14:08) Filiberto & Tara – Going to both end stations electronics rooms 22:28 (15:28) Dave & Jim – Going to the End-Y CER 22:32 (15:32) Kyle – Going to do CP-3 fill 22:51 (15:51) Kyle – Back from Y-Arm 23:00 (16:00) Turn over to Ed End of Shift Summary: Title: 03/21/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT) Support: Commissioning crew Incoming Operator: Ed Shift Detail Summary: Commissioning team has been work on relocking the IFO today. Many problems have been fixed. Wind is coming up and is currently between a moderate and strong breeze (15 – 28 mph); there have been gusts in the mid 30 mph. Seismic activity is up a bit at the end stations. Microseism is also a little high but still within the bands.
1330 - 1350 hrs. local -> To and from Y-mid Exhaust check valve bypass opened, LN2 at exhaust after 2 mins with LLCV bypass open 1/2 turn Next CP3 over-fill to be Wed. before 4:00 pm hrs. local
The attached is the new calibration numbers.
Today we noticed that there were some unidentified bright dots on the ITMX green camera (cam22) which had not existed before. The positions of the dots were found to be functions of the alignment of the ITMX compensation plate for some reason. We temporarily applied a large offset (-530 urad in yaw) on the compensation plate to minimize the effect on the centroid fitting. We tried moving the dots by moving the large suspended optics, but none of them showed dependencies. We have no idea why we started having thees dots. We will try using the camera as it is since the dots seem to be insensitive to the arm cavity alignment.
The compensation plates seem to be responsible for the etalon effect. The green spots disappear, when the green beam is shuttered at the end.
Updated the camera configuration files (centroid and radius) and reference positions. Attached are snapshots and the config files.
Attached are 7 day pitch, yaw, and sum trends for all active H1 optical levers.
Note that the SR3 oplev sum is ~0, even though it's pretty well aligned. No good.
That would be because the oplev is off. It had to be moved for the grouting last week and in the process was unplugged from its power supply. I haven't had a chance to plug it back in yet.
Due to the grouting, none of the oplevs (except the BS, no grouting was done to it) are good alignment references right now. Once the post-grouting optic alignment work is complete I will realign the optical levers.
Attached are 45 day trends of the various PSL power monitors. The degradation of the power matches the decline of the front end laser pump diodes.
I'm curious as to why the trend lines are showing a "tailing up" of power in 3 of the 4 graphs? Was there another adjustment made to the diode currents?
