J. Kissel As per ECR E1400262, and work permit 4764, I've created a new set of channels for the to-be-installed UWash Beam Rotation Sensor (BRS) in the top level of h1isietmx front-end model. This required re-compiling, re-installing, restarting, and restoring the h1isietmx front end process, and a restart of the data concentrator / frame builder / h1dc0 (restarted at 22:48 UTC). Again, because this is all at the top level, not library parts are affected, and I've committed the updated model to the userapps repo. I've also added two new channels to the frames, H1:ISI-GND_BRS_ETMX_RY_IN1_DQ H1:ISI-GND_BRS_ETMX_RY_OUT_DQ both stored at 256 [Hz], and only the OUT channel (which will be the calibrated channel) in the science frames. More details on the calibration once we get the sensor installed. MEDM screen also to come. I was able to restore the platform to fully isolated, managed by guardian, before handing over to Jim for over-night measurements.
restarted it at 7:38pm since it crashed after the first power glitch
Particle counts taken during the installation of the BSC1 door.
Description/Location | 0.3 | 0.5 | 1.0 |
In cleanroom cover on | 13 | 8 | 1 |
In chamber cover 1/3 on people insdie chamber | 6 | 4 | 0 |
In chamber cover on inside work completed | 27 | 11 | 8 |
In cleanroom door on | 47 | 24 | 11 |
Day's Activities
A clean set of top-to-top TFs were previously taken for the ETMX (QUAD) suspension (see LHO aLOG entry 13134), to complete Phase 3a power spectra have been taken with damping loops both ON and OFF for all stages. These power spectra measurements have been compared to previous in-vacuum measurements (allquads_2014-08-01_Phase3a_H1ETMX_ALL_Spectra_D*.pdf). The plot key is as follows:- Black Dashed Line = Expected Sensor Noise Blue Solid Line = H1SUSETMX 2014−01−28_1600, Phase 3b (in-vacuum) Green Solid Line = H1SUSETMX 2014−08−01_1400, Phase 3a (in-air) Summary: Noise floors for ETMX are consistent with previous measurements. However, the LF and RT channels see features in the V DOF for both chains at ~7.0 Hz, ~15.5 Hz and 26.94 Hz, which were not present in previous measurements. Such features were also seen in recent TMSX power spectra too (see LHO aLOG entry 13151), and could be environmental, due to purge air pumps, clean rooms etc. and should be further investigated to ensure it's not baffle related. It should also be noted, that the ETMX L2 UL channel exhibits excess sensor noise, as outlined in a recent aLOG entry (see LHO aLOG entry 13065). All data, scripts and plots have been committed to the sus svn as of this entry.
Particle counts taken during the removal and reinstallation of the north HAM5 door.
Description/Location | 0.3 | 0.5 | 1.0 |
In cleanroom while breaking the door bolts | 66 | 28 | 15 |
In clenaroom with door loose and chamber open | 3 | 1 | 1 |
In chamber after door off | 30 | 11 | 2 |
In cleanroom while door being pulled back | 15 | 10 | 0 |
In chamber after work completed | 12 | 2 | 1 |
In cleanroom with door installed | 4 | 3 | 2 |
Particle counts taken during the installation of the Y-Arm Spool
Description/Location | 0.3 | 0.5 | 1.0 |
In cleanroom before moving spool | 13 | 6 | 0 |
During moving the spool | 69 | 31 | 6 |
At spool flange gap - air from inside tube | 35 | 20 | 12 |
At GV5 flange gap - air from inside tube | 11 | 9 | 5 |
While closing the sock | 64 | 40 | 12 |
In cleanroom after install complete | 170 | 107 | 40 |
BSC2
After respraying the BS optic with FC yesterday, we successfully pulled the FC sheets from both HR and AR surfaces of the the BS optic. After N2 blowing and some spot cleaning, we estimate particulate concentrations of 5-10 particles per square inch. We then reinstalled the elliptical baffles which had been removed for FC application, unlocked the SUS, and Jim unlocked the ISI. Quick TFs on the SUS were ran and approved, witness plate situated, and we moved to BSC1.
BSC1
The FC sheet removal from the external surfaces of ITMy went without issue. After N2 blowing, we estimate particulate concentrations of 5-10 particles per square inch on the external surfaces of both optics, and a factor of 2-3 higher on the internal surfaces. We unlocked both chains, Jim unlocked the ISI, quick TFs on the SUS ran and approved, witness plate and 1" optic installed, Betsy wiped her way out of chamber, and we handed it over to Apollo for door installation.
Particle count measurements were taken in BSC 1 and 2 numerous times during the ~2 hours of First Contact removal and chamber closeout on Friday. First Contact was pulled on the BS HR and AR surfaces around 12:30pm. FC was pulled on the ITMy HR, CP-AR around 1:45pm. BSC1 door was attached to chamber around 2:30.
Counts were always around:
0.3um ~200
0.5um ~60
A clean set of TFs were previously taken for TMSX (TMTS) suspensions (see LHO aLOG entry 13140), to complete Phase 3a power spectra have been taken with damping loops both ON and OFF for all stages. These power spectra measurements have been compared to previous in-vacuum measurements (alltmtss_2014-08-01_Phase3a_H1TMSX_ALL_Spectra_D*.pdf). The plot key is as follows:- Black Dashed Line = Expected Sensor Noise Blue Solid Line = H1SUSTMSX 2014−05−09_1800, Phase 3b (in-vacuum) Green Solid Line = H1SUSTMSX 2014−08−01_1100, Phase 3a (in-air) Summary: Noise floors for TMSX are consistent with previous measurements. However, it should be noted that both LF and RT channels see features in the V DOF at ~7.0 Hz, ~15.5 Hz and 26.94 Hz, which were not present in previous measurements. These could be environmental, due to purge air pumps, and clean rooms etc. and should be further investigated to ensure it's not baffle related. All data, scripts and plots have been committed to the sus svn as of this entry.
[Gary T, Danny S, Matt H, Stuart A, Norna R] During the close-out work of the BSC9 chamber (see LHO aLOG entry 13085) we were able to further investigate the source of the excess noise that had previously been observed on the ETMX (QUAD) L2 (PUM) UL channel (see LHO aLOG entry 13047). Previously, I had swapped field cables at the Satellite Box between ETMX L1 and L2 stages running to the chamber. This indicated that the noise was downstream, i.e. with the field cables themselves or in-chamber. We repeated this test, but this time swapping field cables at the air side of the vacuum flange. Further measurements then eliminated the field cables and confirmed the issue resided in-chamber. Gary inspected and re-seated the in-chamber connectors from the vacuum flange to the OSEM, but this offered no improvement. Finally, the L2 UL AOSEM (s/n #270) was removed and a spare unit connected up in it's place, but again, unfortunately this offered no improvement. This indicates that the excess noise is most likely a in-vacuum harness problem, which would be invasive to attempt to replace. Therefore, it was decided to generate an integration issue and proceed with the close-out of the chamber, with the excess sensor noise on this channel.
Integration issue generated, see Bug #929.
Betsy and I swapped the quadrapuss cable to the L2 (PUM) AOSEMS. This seems to have fixed the noise issue that had been plaguing the UL OSEM for several years. See attached spectra for comparison.
After swapping the cable, we noticed that the 2 lower AOSEMs at the L2 stage (LL and LR) had low OLV values, so we decided to swap these as well. We also took OLV values for UL and UR that were not replaced, but are dying of natural causes.
Old S/N | New S/N | Old OLV | New OLV | Old Gain | New Gain | |
LL | 270 | 332 | 18726 | 18050 | 1.602 | 1.662 |
LR | 483 | 473 | 25518 | 18150 | 1.176 | 1.653 |
UL | N/A | N/A | 17934 | 21300 | 1.673 | 1.408 |
UR | N/A | N/A | 25124 | 20600 |
1.194 |
1.456 |
Gerardo, JeffB, Mike, Hugh, Travis, Appollo, Kiwamu,
We have removed two irises from the output faraday isolator (OFI). They were originally meant for a temporary tool for aligning the OFI and we simply forgot to remove them. So we opened up the HAM5 north door and locked the north side of the ISI. Then we took out the two irises -- one at the input side and the other at the output side. Note that we left the irises' holders attached. Also, Gerardo replaced the holder at the output side with a clean one because the one we had was not class-A compatible.
After unlocking the ISI, Hugh checked the balance of the ISI and he did not see a significant change. So we did not have to put a counter weight as expected.
We revisited the HMA5 installation exit check list, performed those activities and found nothing special. So it is good.
Some pictures will be uploaded later.
Here is 12 hours of the Vertical CPS channels. The left three are the local in counts and the right three are Cartesian in n(m/rad) Nice that we can so clearly see a 22 gram payload change. In the local basis we have +-1600 lock unlock shift spec as being balanced close enough. When I balanced this on 21 July , the shifts were <200cts. So the comparison seen before and after the disturbance when JeffB half locked the ISI and ISC removed the irises are still well within our spec. The signs and magnitudes all make sense (Thanks ISC for this check!) with the worst being RX tilting 6urads.
ITMy
CPy
*** This is the actual pitch of the CPy. The listed error is relative to where the CPy needs to be to be parallel with the ITMy AR surface, assuming the ITMy has zero pitch error; this does not include any FC correction done on the ITMy. Since we cannot verify the ITMy pitch after FC removal, we also cannot verify the CPy pitch relative to the ITMy AR surface after FC removal. We have to assume that E1200791 is correct (we have only been able to test this one time at the ETMy, which moved upward by 442 µrad, but one data point does not a trend make) and that the ITMy will pitch up by ~352 µrad upon FC removal. Therefore our expected relative pitch between ITMy and CPy upon FC removal is 490 µrad up (14 µrad down ITMy HR pitch + 1309 µrad down wedge - 833 µrad CPy pitch = 490 µrad up relative pitch). As stated above we can weigh the FC to get some idea of the pitch change.
ACB (relative to the ITMy)
This completes IAS alignment of ITMy; our equipment has been removed from the Y manifold spool area to allow for the Cryopump Baffle installation. This also ends the IAS alignment of the aLIGO H1 interferometer.
First off, small correction to the ITMy target pitch: it should be 339 µrad, not the 340 µrad as listed. This puts the ITMy pitch error at the time of IAS equipment teardown at 27 µrad down.
Measured the mass of the First Contact removed from ITMy today.
Summary: Eight years of wind data at 3 LHO stations were analyzed. Fifteen percent of hours had wind speeds exceeding 10 m/s, the speed at which displacement and tilt from wind start to significantly increase the seismometer signals. Nearly 25% of hours in April, the month with the highest average wind speed, have winds exceeding 10 m/s. Data are also shown for individual stations; readings for EY are the highest.
Introduction: The analysis of wind data is important because wind speeds over 10 m/s increase ground motion and thus affect interferometer performance. This increase in ground motion is caused by wind interacting with the topology of the site and, most importantly, the surfaces of buildings. In addition to producing displacements, wind blowing on the buildings can tilt them, which can produce spurious acceleration signals from seismometers.
Methods: Eight years of data between 2004 and 2012 were analyzed for patterns across the years. The data was extracted from DataViewer for the Corner Station (CS), End Station X (EX), and End Station Y (EY). The "Maximum Channel" was selected of the "Hourly Trend" setting within DataViewer. This time period was selected because it was not missing more than 58 days of data at a single time in the series and only a total of 218.7 days were missing from the entire data source. This amounted to about 8% of the data missing from the entire data set. The data was considered missing if DataViewer did not provide it.
Results: The first figure shows that 15% of the hours in the 8 years analyzed exceeded 10 m/s, which significantly increases ground motion. The second figure shows that, during each of the spring months, the wind was greater than 10 m/s in more than 15% of the hours, peaking at 24% in April. The third figure shows that the average hourly maximum wind speed varied the most from year-to-year in the month of February. The fourth figure includes statistics for the individual stations. Averages for EY are higher than for other stations. For example, 27% of April hours exceed 10 m/s at EY while the average for all stations was 24%.
Margarita Vidrio, Robert Schofield
In Fig 5, the wind speeds exceed 10 m/s thirty eight percent of the time in June at 2 AM and April at 11 PM. Also, the month of December shows a consistent percentage (between 8%-10%) of wind speeds over 10 m/s across all times of the day.
Calum, Rich, Matt
HAM4
The soft cover on the South door was not billowing at all. Despite the obviously low purge air and Matt working in HAM4, the initial particle counts were low. Before starting work, I wiped down everything I could reach with a pre-wetted wipe. Calum and I inspected the optic with a green flashlight (not to be confused with the Green Lantern, D1400060). For both faces of SR2, we estimated 25-100 particles per square inch depending on the region. BEFORE applying FC, we found a ~1 inch piece of leftover FC from the alignment layer on the HR side, and what appears to be a long strand of FC on an earthquake stop. There were numerous glove prints and leftover FC on both faces near the barrel. Because the HSTS legs are warped from welding, we had to use 2 washers on a side of the spray cone bracket to keep the cone on its intended track. Not surprisingly, the particle counts spiked while spraying FC. The "CAL Alarm" popped up on the count taken while spraying. I need to look up the settings for the handheld particle counters to check what that means. The FC appeared much thinner and had more bubbles than usual, but there were less cobwebs than we observed on Saturday. We moved on to HAM5 to let the FC dry.
Matt returned later to retract then remove the spray cone. The wipe on the end of the cone stuck against the optic when the cone was retracted. This has never happened before at either site, not even when a cone was left on overnight. I used the same procedure (E1300017) as always. Matt pulled very gently on the wipe, and it separated from the optic. I painted 3 layers of FC around the edges and added a PEEK tab. The painted crust was much darker in color than the sprayed FC.
Outside chamber (before work) | Inside chamber (before work) | 3 mins after 1st FC layer | While spraying 2nd FC layer | 3 mins after 2nd FC layer | 5 min after 2nd FC layer | 3 min after last FC layer | Outside chamber (before painting) | Inside chamber (before painting) | Exiting (Matt) | |
0.3 um | 10 | 70 | 70 | 918200 | 4330 | 670 | 1380 | 10 | 200 | 850 |
0.5 um | 0 | 20 | 20 | 749920 | 3030 | 500 | 1010 | 0 | 40 | 380 |
0.7 um | 0 | 20 | 20 | 586250 | 2310 | 340 | 750 | 0 | 30 | 270 |
1.0 um | 0 | 10 | 20 | 466730 | 1630 | 270 | 600 | 0 | 20 | 170 |
2.0 um | 0 | 10 | 20 | 293620 | 830 | 170 | 340 | 0 | 10 | 70 |
5.0 um | 0 | 0 | 0 | 62590 | 60 | 10 | 40 | 0 | 0 | 30 |
RH (%) | 35 | 22 | 27 | 30 | 28 | 34 | 27 | 39 | 20 | 31 |
Temp (F) | 75 | 75 | 72 | 73 | 73 | 73 | 73 | 75 | 70 | 70 |
HAM5
Like HAM4, there appeared to be very little purge air. Spraying SR2 with FC only a few minutes earlier likely caused the high initial particle count in HAM5. SR3's HR side had 10-30 particles per square inch and a big streak of FC from the alignment layer plus small bits of FC near the barrel. SR3 was sprayed on Saturday. A modified mix with slightly more thinner was used for the 1st layer in an attempt to reduce cobwebbing. It worked, but there was more backsplash (contained by the cone). The standard 1:1 mix ratio of FC and thinner was used for the 2nd and 3rd spray layers.
On Sunday, we removed the cone and painted the crust on SR3. The dried FC spray looked uneven and runny.
Outside chamber (before work) | Inside chamber (before work) | 1 min after painting | Exiting HAM5 (Matt) | |
0.3 um | 0 | 780 | 320 | 140 |
0.5 um | 0 | 390 | 130 | 50 |
0.7 um | 0 | 170 | 40 | 30 |
1.0 um | 0 | 100 | 30 | 0 |
2.0 um | 0 | 60 | 10 | 0 |
5.0 um | 0 | 0 | 0 | 0 |
RH (%) | 35 | 35 | 33 | 39 |
Temp (F) | 74 | 75 | 70 | 71 |
BSC2
The beamsplitter was absolutely filthy, and had over 50-100+ particles per square inch. There were tiny circles all over the HR side that looked like rings left by evaporation. There were noticeably more fibers on the AR side. Both faces had glove prints and lefover FC near the barrel. I didn't get any good pictures unfortunately.
I sprayed both faces on Friday, and painted the crusts on Sunday. Like SR3, the FC on the BS was extremely runny.
Outside BSC3 (before work) | Inside BSC3 (before work) | Inside BSC2 (before work) | Exiting BSC2 | |
0.3 um | 70 | 130 | 190 | 360 |
0.5 um | 50 | 50 | 120 | 260 |
0.7 um | 30 | 30 | 100 | 250 |
1.0 um | 20 | 10 | 100 | 230 |
2.0 um | 10 | 10 | 70 | 200 |
5.0 um | 10 | 0 | 70 | 110 |
RH (%) | 36 | 18 | 20 | 20 |
Temp (F) | 71 | 71 | 73 | 69 |
I'll add photos soon.