Attached are the CPS Noise plots for the past week.
Cheryl, Jason
plots of data for PMC, ideal, and measured, and beam scan data collected yesterday, as well as distances used for the plots in a matlab .m file, and a huge image (7.5MB).
beam scan data from the bottom periscope is attached, distances are from the PZT, and the lens after the bottom periscope mirror is ~238.5mm from the PZT.
DUE TO SPACE AND COOLING LINE ISSUES, the original power readings were done with a power meter head that is supposed to be water cooled, but currently isn't. The readings from yesterday matched very closely the power out of the PMC that was measured with the water cooled beam dump, and were consistent when running the power to max and min at the bottom periscope. The plan for today was to use the air-cooled power meter head that can go to 50W, that we borrowed from TCS (TVo), to verify power at the bottom periscope mirror and the PMC.
We started pumping down HAM6 this morning with scroll pump cart. Kyle and I also He leak checked HAM1 east/west doors and found no leaks with a background of 5e-9 Torr-L/s. HAM1 pumpdown pending. We also blew down both chambers and measured dew points:
HAM1: -26°C
HAM6: -18°C
HAM6 dew point is relatively high, likely from purge air being valved out for hours/days prior to door installation.
FYI: here is the layout for the beams on HAM1: D1000313.
This closes Work Permit 7936.
Cabling and power are now complete.
Looking over trend data from O2, the second loop ISS seemed to have operated with ~2.5% diffracted light.
This morning I adjusted the offset slider to diffract ~2.5% and re-adjusted the light level on the ISS
photodiodes. This should be okay for the second loop now. MEDM still indicates more than 50 W as the
output of the pre-modecleaner with the ISS on.
The transfer function was recorded for slider settings of 8.0 dB and 15.0 dB (ISSG8.jpg and ISSG15.jpg
respectively). When the slider is increased beyond the ~10 dB, there is a large increase in the noise
spectrum from ~80 kHz upwards (gains.png).
With the gain slider at 15dB, you ahve onlt 10 degrees of phase margin, so the increase of noise in the 80kHz region is likely due to gain peaking.
Looking at the open loop transfer function, the optimal UGF should be about 30 kHz, as in the first SR785 screenshot
Attached are traces like I plot yesterday of the INMONs and the OUTPUTs of the Table Top L4Cs. The digital gain switch is obvious on the INMONs and nothing shows on the OUTPUTs. And now that the chamber is closed and HEPI is isolated, the sensors don't looked to be at risk of saturating, in general.
Attached are uncalibrated spectra from the new TT(Table Top[sic]) L4C that are actually inside the Optics Table, not on top of the table. The reference, thick traces are before unlocking HEPI and the current traces are with HEPI off the stops and Robust Isolated. All the RMs are damped/aligned.
EE (Ed) is cabling up the ISCT1 so the current spectra may show some activity. It looks like the V1 sensor may have an issue below about 400mHz as it does not follow its sisters lower when isolated. V2 also has some noise around 1Hz. Likewise, not sure why the H1 sensor gets worse after Isolating below 200mHz. The H1 also has some noise around 20Hz.
Bubba G., Chandra R., Chris S., Gerardo M., Kyle R.
Installed HAM1 East, HAM6 East and HAM1 West doors today -> Chandra R. opted to not replace the O-ring(s) on HAM1 West door upon close inspection with high-intensity lighting.
Following installation of HAM6's door, I noticed that the sound of the purge-air expelling into the clean room did not change as a result. This is not normal. Investigation revealed that the 1 1/2" metal seal purge-air valve was closed (hand tight). As such, no purge air was being routed into HAM6. I had reduced the flow yesterday? Monday? at others request but today, flow into HAM6 was fully blocked-off. We are conditioned to assume that the purge-air is always valved-in when doors are off of a chamber because that is the state that we want to leave it but we may now have to consider that multiple people will be adjusting this and not assume that flow hasn't been altered.
Chandra R. and Gerardo M. helium leak checked the outer O-ring of the newly installed door on HAM6.
More vent recovery to follow tomorrow.
NOTE TO IFO community -> the unlocked HAM2 HEPI crossbeams had been stepped on (by accident) at some point during the HAM1 door installation today.
Important to note that the concrete floor next to HAM1 doors was exposed during door operation.
[Kyle, Gerardo, Chandra]
HAM6 east door passed helium leak check with background at 1e-10 Torr-L/s. HAM1 east/west doors will be leak checked tomorrow. We carefully inspeced HAM1 west door o-rings after Kyle noted they looked contaminated. After a wipe down, they looked "normal" to me. We were extra suspicious because of the white tape that was left on flange from previous door job, which more than likely means the doors was leak checked last time. When vacuum breaks out the tape, it's serious business.
IP2 on top of IMC tube was vented with UHP bottled nitrogen and all but a few nuts/studs were removed from the flange that mates to its gate valve in preparation for removal tomorrow in order to install newly rebuilt ion pump with a chevron baffle.
Kyle cleaned and baked (class B) several foreline flex hoses overnight so we can start pumping down HAM 1 & 6 tomorrow and leak check their new feedthroughs.
Amidst lots of various activities, the 2 HAM1 and HAM6 end cap door went on today - thanks, Chandra, Kyle, Gerardo, Chris, and Bubba!
Placed cable strain reliefs on the HAM1 feedthroughs. Also made sure no cables were touching the horizontal blue beamcross.
Patrick, Richard, Filiberto In the TwinSAFE project for the laser safety interlock I have turned off the sensor test for channels 3 and 4 of Term 7 (EL1904). These should be the emergency stop input channels for the squeezer bay. The change was downloaded to the EL6900.
This was done to allow the squeezer push button to be connected to the system. The Beckhoff module monitors the push buttons buy sending pulses out and timing the return. The High bay entrance and squeezer are to long of runs for the timing to function properly so we have disabled this until we come up with a better solution. The system will not function with the timing fault but works with it disabled.
Rolf, Keith, Jonathan, Dave:
The Dolphin driver version used by the front end IPC system was upgraded from 5.4.2 to 5.7.0.
DOCS: Rolf and Keith's Gen 2 Dolphin installation document DCC-T1800016 and our installation wiki DolphinDriverUpgrade
Procedure was:
Before any driver changes, yesterday I compiled all models to create a clean H1.ipc file. At this point we discovered h1susmc[1,2,3] build issues due to a modified M1 sub-block which was fixed by Jenne.
Backup all the old 5.4.2 driver files.
Stop the dolphin networkmanager on h1boot1, disable auto start of user models.
Install the new 5.7.0 driver. Apply LIGO customizations.
Compile and install all of the front end models. Compile the h1cdsrfm long-range-dolphin switch code.
Stop all models (/etc/kill_models.sh on each Dolphin machine), h1psl0, sus-aux and mid-station pem exempted.
Stop dolphin node manager on all dolphined machines.
Start 5.7.0 Dolphin network manager on h1boot1. At this point nothing is running on the fabric.
Reboot h1lsc0 as a test node. Remember models do not auto start at this time.
At this point we ran into startup issues, which Keith was able to remotely diagnose and fix. Many thanks to Keith for his quick support.
Each dolphined machine was rebooted, and we monitored their progress on the Dolphin administration GUI (see attachment).
Started the new h1cdsrfm code, the cleaned up H1.ipc file has filled in the gaps resulting from previous IPC misnaming and false starts in models (see attachments).
Once all the Dolphined machines were running, we still had a single node error. We realized that this was h1psl0 running the old drivers. These could not be removed because the iop model was locking them. Jonathan came up with the good idea or removing h1psl0 from the dis_hosts.conf file for now. We can add it back before O3 when the Dolphin IPC is needed for ISS third-loop operation.
At this point the Dolphin fabric was clean. We then started all the user models (except for PEM, SUS-AUX and MID-PEM)
A DAQ restart was required due to model changes for h1hpiham1, h1susmc[1,2,3] and h1susopo. A modified h1psliss filter file (resulting by the make-install) was reversed.
CDS Overview and IPC_STAT overviews are GREEN. All SWWD's were untripped and IFO operations continued around 14:30 PST.
TITLE: 11/21 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: None
SHIFT SUMMARY:
LOG:
16:32 Dave B called in to check in - he's on his way in to begin his
16:35 Chandra out to LVEA - HAM1 door
16:58 FIl and Marc out to LVEA - cable from Vac rack to HAM4
16:59 Richard out to LVEA
17:08 Cheryl out to the PSL
17:11 Richard back
17:15 Cleaning crew out to end stations
17:38 BRS has been switched off at both end stations
17:45 Gerardo out to LVEA
17:55 Peter back
17:50 Jeff J out to LVEA
18:05 FIl and Marc working on the Safety Interlock system - TCS
18:10 Door crew - E door HAM1 is on W door is still off; Crew is moving to HAM6 endcap
18:14 Betsy out to LVEA - walkaround
19:00 Tour group into CR
19:01 Jim W out to LVEA - HAM3 area
19:02 Betsy out to LVEA
19:19 Richard out to LVEA
19:34 Stop work order
19:55 Jason and Cheryl back
20:01 Jim to CER - approved by Mike L
20:23 All core optics put in "Safe" state for model reboots
21:41 Stop Work lifted -Chandra out to IP2
21:57 Corey and Hugh out to Ends - Wind Fence surveying
22:21 Cheryl out to the PSL
22:30 Jason out to PSL
22:36 recovering IFO (as much as possible) from model reboots and DAQ restart
22:38 Ops Overview came back in "Locking" mode - reset to "Corrective Maintenance"
23:00 Fil out to LVEA - HAM6
23:05 Hugh out to LVEA - HAM6
23:11 Betsy out to LVEA - HAM6
23:33 Jeff J out to LVEA
23:37 Betsy and Hugh back
23:47 Betsy ou to EY - looking for HAM door bolts