peter.king@LIGO.ORG - posted 05:01, Friday 15 December 2017 (39773)
LVEA transitioned to LASER SAFE
The LVEA has been transitioned to LASER SAFE.
Images attached to this report
The LVEA has been transitioned to LASER SAFE.
For the duration of the current post-O2 Vertex+YBM+XBM vent and up until a few days ago, the two Bayard-Alpert/parani wide-range pressure gauges located at BSC7 and BSC8 have been "railed" at their maximum pressure reading of 750 torr. Recently, however, they are both "on-scale", i.e. reading less than 750 torr. I assume that this is the result of the recent weather (low barometer) and not related to the recent purge air supply issues.
Please be mindful of the signs and the floating blue parts. The pump station is not running so the HEPI can not be isolated. So, the platform can not be tripped but it can be moved, so again, mind the signs and avoid the blue hardware. The ability to isolate and so be tripped will not be until all the 4-way valves are changed to the run position and fluid is lowing through the actuators. I don't want to re-pressurize the flex lines near the open chambers so waiting on doors.
When the HEPIs were locked way back mid September, it was done so with them isolated and it was attempted to lock them in the isolated position. WHAM4 was locked pretty close, see aLog 38654 for the numbers. However, since all the alignments and work was down in the locked position, the CART_BIAS SETPOINT which is the servo'd to position, was reset to the locked position. After unlocking, the large HEPI payload springs were adjusted to reduce the residual=free hang position less the setpoint, as much as possible. Did manage to get under 3um or urads. The final adjustments were single springs turned ~1/24th turn. After isolating or running TFs or ROM tests, this free hanging position will likely change, but, it is a start. At least the first time it should have no problem isolating and serving to the TARGET locations. SDF files have been updated but not committed (issues with svn I understand?)
"However, since all the alignments and work was down in the locked position,..." this phrase should have read However, since all the alignments and work was done in the locked position...
TITLE: 12/14 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC STATE of H1: Planned Engineering LOG: 17:40 UTC Jeff B. and Kentaro to LVEA, working on camera 18:01 UTC Chandra reports purge air is back online 18:11 UTC Bubba and Apollo starting WP 7249 18:11 UTC Terry to squeezer bay, not turning laser on while Apollo is working at height 18:30 UTC Ed to LVEA to prep for IO work 18:49 UTC Kentaro back 19:09 UTC Christina to mid X 19:14 UTC Jeff B. back 19:43 UTC Betsy and Travis to BSC2 19:43 UTC TJ to TCS tables to add cables 19:44 UTC Karen to H2 building to clean 19:55 UTC Terry back 20:02 UTC Karen back 20:06 UTC TJ back 20:09 UTC Bubba done, ready to go to laser hazard 20:30 UTC Ed to LVEA 20:34 UTC Betsy and Travis back 20:38 UTC Peter transitioning LVEA to laser hazard 21:00 UTC Bubba, Marc, Tyler back 21:23 UTC Terry to squeezer bay, squeezer bay to laser hazard 21:35 UTC Betsy to optics lab 21:38 UTC Nutsinee to squeezer bay 21:39 UTC Gerardo to HAM4 to get part number from viewport covers 21:54 UTC TJ to TCS tables to finish cabling 22:09 UTC Hugh to HAM4 to unlock HEPI 22:27 UTC Jenne and Sudesh to look at ISC racks near PSL enclosure 22:30 UTC TJ back 22:35 UTC Tyler and Marc staging equipment near HAM4 for install 23:24 UTC Jenne and Sudesh back 23:36 UTC Marc and Tyler back
J. Kissel, B. Weaver
Betsy and I took standard top-to-top mass transfer functions of H1 SUS SRM and H1 SUS SR3 to ensure after the heat of first contact removal and door re-application they're still free. They are. Great!
Results attached.
(Suspensions are undamped, with alignment offsets ON)
Data and updated processing scripts have been committed to the repo.
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/SAGM1/Data/
2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_L_0p01to50Hz.xml
2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_P_0p01to50Hz.xml
2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_R_0p01to50Hz.xml
2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_T_0p01to50Hz.xml
2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_V_0p01to50Hz.xml
2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_Y_0p01to50Hz.xml
/ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/SR3/SAGM1/Data
2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_L_0p01to50Hz.xml
2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_P_0p01to50Hz.xml
2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_R_0p01to50Hz.xml
2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_T_0p01to50Hz.xml
2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_V_0p01to50Hz.xml
2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_Y_0p01to50Hz.xml
Attached are a few pictures of the newly added baffles around the West (+Y) side of the HAM5 table, shielding the table, and SRM and SR3 optics.
Here are a few pix of the new OFI baffle and AWC mirrors on HAM5, installed over the last couple of weeks.
Although Kissel has been posting mass records of B&K results on lots of in-vacuum items, I'll show the full whiteboard list of what he has measured and been analyzing in the attached photo. All B&K measurements for this vent have been complete! Well done!
I'm posting the BnK measurements of the HAM2 & HAM5 table baffles. I've split the plots up into similar structures (Plus/Minus X/Y beard baffles, Middle beard Baffles, HAM2 table top baffles, HAM5 table top baffles) and equivalent excitations/accelerometer orientation relative to "beamline" (X for HAM2, Y for HAM5). I'm using Jeff's names for the baffles, so Table baffles are the beard baffles. Table Top baffles are the table baffles that typically lie flat on the ISI optics table in front of the suspensions. It looks like I grabbed the wrong data for the MC1 Table Top baffle, so I need to look into that some more.
Most of the well resolved stuff seems to be well damped, I don't think I saw any of the low frequency (50-60 hz stuff) on the first plot in the HAM5 or HAM2 ISI tfs. The sharp 120 hz feature on the HAM5 MinusX table baffle is worrying, but there was probably a lot of loose mass on the table at the time. The HAM5 measurements are from Dec 6, before Hugh and Brijesh balanced that table.
I've put the txt BnK exports in the Seismic SVN at:
/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/Common/Data/HAMBnK_measurements/HAM2/
/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/Common/Data/HAMBnK_measurements/HAM2/
The script I made the plots with is at:
/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/Common/Data/HAMBnK_measurements/HAM2_table_baffles.m
As far as the HAM5 table goes--I cleaned up the table and bolted down and viton'd the table top masses on Dec1. However, on Dec7, GM found the new ZM2 mirror and the Septum Beam dump needing torquing.
HAM2: align intensity stabilization photodiode align beam coming off HAM2 table Betsy, Travis done with BSCs, leaving first contact on due to delay in HAM2 work IP4 is removed, next step is to install NEG pumps, first is ready to go on Chandra out next week, Kyle in charge of pump down Gerardo testing HAM5 viewport TMDS installed Cryopump decomissioning at mid Y scheduled for mid January Hugh: feedthrus ready to go on HAM6 Jason asked to start bringing optical levers back online over next couple of days TJ and Sheila starting to populate table Volunteers sought for onsite inspections during holidays Kyle and Chandra may run leak checks over holidays
The LVEA has transitioned to LASER HAZARD
We have been observing was seems to be flow restrictions in purge air so today as means of trouble shooting we replaced filters at the skid. Three of the four filters were replaced (could not replace the third one because its threads seem to be galled, but it visually looks ok and has been replaced in the past). The first filter had burn marks. The second filter was heavily loaded with rust dust. The fourth filter looked ok.
We disconnected all seven purge air points of use in LVEA to flush system with new filters. After several minutes we measured zero particle counts and -28degC dew point.
Closed WP 7247.
I'm running TF's oin SRM and SR3 SUSes.
At around 5:30 am several text alarms for CP7 rolled in all at once. MEDM screen looks normal. Will be in soon for visual inspection. Alarms are LN2 level error and discharge pressure error. Also got alarms for EY Y2 pressure and RO water system.
CP7 and PT-424 signals have all flat lined. In fact all signals at EY have flat lined. Going back out to check Beckhoff rack.
The battery that stores solar energy for Y2-8 gauge at IP isn't charged up enough and caused the gauge to turn off which caused a communications fault at EY. Richard and Patrick are on it.
I misread one of the texts. It was actually EY Y2 CC error (CC=communications). Not PT-424, which just so happens to be labeled "EY_Y2_PT-424"
Richard, Patrick The same thing happened at end X later this morning. The equivalent of the following was done: end Y: Disabled Pressure Gauge Y2-8 (BPG 402) File -> Save All TwinCAT -> Activate Configuration Popup: Restart in Run Mode?: Yes PLC -> Login Check that the values of the GVL variables are changing Close and restart the EPICS IOC end X: Disabled Pressure Gauge X2-8 (BPG 402) File -> Save All TwinCAT -> Activate Configuration Popup: Restart in Run Mode?: Yes PLC -> Login Check that the values of the GVL variables are changing Close and restart the EPICS IOC Burtrestore: On vacuum1: cd /ligo/cds/lho/h0/burt/2017/12/13/06:00 burtwb -f h0vacex.snap burtwb -f h0vacey.snap
The LVEA has been transitioned to LASER SAFE.
After another marathon day in chambers, Fil, Richard, Travis, and I finally finished connecting the newly fabricated ITM ESD feedthru connections in-chamber and their subsequent testing (FRS Ticket 5033). The testing, of course, was not straight forward and we walked around troubleshoot a few things here and there. We struggled with the ITMX BIAS intermittently failing the HIPOT testing and continuity checks (see issues with this reported last year 27562). We tracked down the issue to the pin at the other end of the cable we reterminated (and have not touched during this vent) which led to me disassembling the connector a bit and looking for shorting mechanisms. I didn't find any, but upon reassembling the connector, things seemed to test fine. Sigh.
Fil will likely post the full numbers above or below this alog for both ITMX and ITMY testing (which included HIPOT).
Meanwhile, the ground checks of the SUS cables that were checked on ITMX, ITMY, and the BS which failed a few days ago were fixed via a variety of reseating the connection fasteners at the feedthru end of the cable, remedying pinch points of cables in-vacuum, or resolving to have EE fix it somewhere on the outside. Most of the cables had not been touched during this vent, with the exception of the ITMX PUM one which had migrated out of it's viton pad seat during the ITMX rebuild last month.
So, really, really we could do the BSC 1, 2, 3 closeout tomorrow.
Sorry, forgot the shout out to Gerardo and Kyle who swapped the actual feedthru at the chamber port.
After new feedthru was installed:
1. In-vacuum cable was connected
2. New 5-way connector pigtail was connected to feedthru (air-side).
3. All pins were tested with HI-POT tester to 1KV, except ITMX bias which was only tested to 500V. This included new pigtail air-side cable.
4. After HI-POT testing, grounding shorts were addressed for cables SUS-42 and SUS-57. See alog 39744. Found one of the cables had its air-side backshell shorted to cable shield. This was fixed. Other issue was fixed in chamber, see above entry from Betsy.