The backup file server cdsfs1 has been crashing over the weekend. I performed an fsck on its file system today (no actions were needed) and was able to rsync cdfs0 and h1boot before it crashed again at 5pm. I'll reduce the rate of rsyncs back to daily and look into buying a spare raid controller card.
Aggressive isolation filters were designed on ISI-BSC6. UGFs are:
- 40Hz on all stage 1 DOFs
- 32Hz on all stage 2 DOFs.
The simulink diagram was completed to perform the sensor correction from stage 1 to stage 2. The model was recompiled and installed on h1seiey. Spectra were measured in the following configurations:
- Stage 1 super sensor with T240s blended at 250mHz on all DOFs.
- Stage 2 super sensor with blend at 250mHz on all DOFs.
- Sensor correction on both stages (except on Stage 1 Z)
Calibrated spectra of stage 2 are presented in attachment. Results are good.
The 2 high pass filters used for the sensor correction create a x10 amplification below 100mHz. It is less visible in the Z direction since the sensor correction is only engaged on stage 2.
in SusSVN/sus/trunk/Common/Matlabtools :
in SusSVN/sus/trunk/Common/Matlabtools/SchroederPhaseTools :
In SusSVN/sus/trunk/QUAD/Common/Matlabtools
The 3 directories have been commited on the svn
Apollo crew moved BSC Repair Arm, HAM Install Arm, 5-axis Table, and other install tooling to the south side of the beamtube between HAM10-11. Christina wiped down the BSC3 ISI storage container and the Apollo crew moved the HAM cleanroom over the beamtube and set it down close to the storage container.
Activities of which I was informed about:
- Hugh at Y-end station, HEPI work.
- Apollo crew, moving items with crane from south bay area to the West north wall area.
- Cheryl, Input viewports cleaning, see her entry.
- Pablo and others inside H2-PSL room, Pcal work.
- Patrick to the LVEA to check on dust monitors.
MitchR, JimW
After several furious hours of helicoiling, forklifting, placing bolts and torquing, the last 2 large plates for the first (formerly-known-as-H2) I1 BSC ISI were added to the assembly today. Next up, everything else: pods, actuators, cps's... Potentially, we could be testing sometime next week.
Restarted dust monitor at location 8 in the LVEA. I found it turned off outside of a small clean room between HAM 2 and HAM 3. Looking at the trends it appears someone turned it off this morning.
I used FC on both input viewports, ALS and PSL. Both viewports looked significantly better after cleaning - at least a 95% reduction in features. The remaining 5% are probably particulate that reattached after I pulled the FC, but could also include stubborn particulate that didn't come off, or features in the optics coating. This was my first look at the ALS viewport, and it did have a fair amount of particulate on it. The ALS shutter has removed some anodization inside it's housing. My rookie venture into spraying FC meant there was some to clean up around the edge of the optic on both viewports. Though I was careful, it's possible the solvent I used to clean it up (methanol) could have migrated residue under the flange. When we have the new shutter, we should consider removing the viewports and doing a more thorough cleaning and inspection in the optics lab. I have no idea what level of risk, if any, this would be to the optics themselves. I cleaned what I could reach inside both shutters. *** I locked the PSL shutter closed *** Filiberto and crew were planning to pull cables about the HAM1/2 enclosure, so this is now laser safe for their work.
Re 6334, I forgot to turn Corner4 back on after working at Corner3. The power to the Piers are daisy chained; I just forgot.
BSC 1 is now added to the list of chambers flushing, with HAMs 2, 3, and BSC 1 now being flushed in the LVEA. The max pressure we've been able to attain has been about 29 psi, this is with running the pump to max and backing down a little. Air has been caught in the resistors and is being purged on a regular basis. The system works.
HAM2 actuators have been switched into the operating state. HAM3 and BSC1 continue to be in the flushing state.
I noticed that IM4 transmission and MC2 transmission SUM spactra looked totally different. Specifically, it looked as if IM4 transmission had one extra dewhitening filter in digital land (see the plot).
This was tracked down to the modification of the dual QPD transimpedance amp box for HAM2 (D1002481, S1102815) where the unswitchable 0.4:40 whitening filter was disabled:
"02/13/2012 Charles Osthelder Modification Description R1, a 200 ohm resistor, was removed from each channel to negate the whitening filter. The resistors were placed in a poly bag and taped to the inside of the chassis to be reinstalled when necessary."
This modification was not done to other amplifiers (s1102819 for MC2 trans, s1102810 for POP sled). All QPD filters in the digital land had 40:0.4 dewhite enabled.
I removed 40:0.4 from the filter definition for IM4 trans and ISS QPDs.
I wanted to switch one stage of 1:10 switchable whitening for IM4 trans, which worked, but I couldn't enable any of three digital 10:1 dewhites manually (FM1, FM2, FM3 in H1:IMC-TM4_TRANS_SEG1 etc.) even though I can enable/disable Comb60 (FM6).
So for the moment IM4 transmission is left whitening-less.
Installed a replacement HEPI pump controller at EY to replace the unit which no longer boots. This controller is connected to the slow controls network as h1hpipumpctrley. The pump controller has an epics database customized for EY. To start the IOC, log in as controls, cd to ~controls/target-ey, then as root execute the ./run command. The SITEMAP.adl was modified to have a "Pump Controller" entry in the LVEA and EY HEPI menus. Note that the pump controller at EY is not actually controlling anything, it is just monitoring pressure. Also, the pressure sensor needs to be connected to the correct input.
I turned the power going into the PMC down to 33 W. We plan to run at this power at the end of the HIFO, when we replace the output coupler mirror inside the high power oscillator with an HR mirror, so it seemed a good idea to go ahead and run at this power now.
The FSS common gain was set to 22 dB to give a UGF at 400 kHz.
Re aLOG 6184, I completed the replacement of the Kaman Inductive Position Sensor (IPS) on corner3 (SE) BSC2. The Kaman satellite box mounted inside the Pier Pod faulted and will go back to the shop. We installed another pod which had the Kaman inside but of course was unmatched to the Coils. EE mounted a replacement Box inside the original Pod and today I swapped out the coils on the HEPI Actuators. There is one box for both horizontal and vertical so both had to be replaced. This was no fun with terrible vision and less access. Refer to the photos attached: The pdf is a view of the HEPI Housing under the SE corner of the BSC2 Crossbeam and has a couple pointers on it locating the Flag, D030705 and the Kamans mounted on the Sensor Holster D020369 on the Vertical HEPI Actuator. The Sensors are on the floating portion. The first photo zooms into the top of the vertical Actuator. The Flag must be loosened but fortunately not removed so it can 'yaw' allowing the Sensor Housing/Holster Assembly to be completely removed so the coils can be swapped. Finding the 3/32 SHCS holes behind everything inside there was why there were reports of loud hollering in the LVEA this afternoon. The second photo is the Horizontal which was way better but still not fun. Bad/Removed PierPod/Kaman: S1202914/S0812221-06-04; The original PierPod went back in with Kaman S0812221-06-22.
LVEA: Laser Safe Gerardo and Kyle at working EY VEA Mike R working in H2-PSL Cyrus testing cables and install wireless AP at EX Pablo working with Mike R. in H1-PSL. They are switching in and out of Laser Hazard inside the H1-PSL Gerardo and Kyle working on GV-5 Hugh and Greg working on HEPI on BSC1 and BCS2 Jax at EY gathering up circuit boards for modifications Apollo working on Op-Lev Pier anchors at EY Mike R working in H1-PSL Dave & Jim replacing pump controller at EY 16:04 Shelia transition EY to Laser Hazard
Ear Bonding of ETM08 was aborted after finding precipitates inside Sodium Silicate Solution bottles, I contacted manufacturer and was told items had expired. Norna was notified and bonding was suspended, new solution is on its way to LHO, bonding will resume next week.
Measurements by Marielle van Veggel indicate that silicate bonds made with "old" sodium silicate solution do not have significantly lower strength or lower quality. For details see T1300482-v1: https://dcc.ligo.org/LIGO-T1300482-v1 Nonetheless, with an abundance of caution, we should replace the commercial sodium silicate bonding solution every year. The silicate bonding procedure (https://dcc.ligo.org/LIGO-E050228-v3) will be changed to specifically note this shelf life limit.
(Danny S, Gerardo M)
ETM08 cake tin was opened this week, Danny and I inspected the optic, and we found it very dirty, lots of particulate and some sort of "water spots/marks" are present on the optic's barrel. Attached are some photos of the ETM08. Water like "spots/marks" are present only on the barrel, more pronounced towards the bottom of the optic.
Had to break for a meeting. Got the first IPS changed(Horiz) on the Actuator. Will replace the Vert and the Pod after lunch. Meanwhile Pier4 is also offline as the power to it comes from Pier3.
Completed
