Displaying reports 57041-57060 of 82999.Go to page Start 2849 2850 2851 2852 2853 2854 2855 2856 2857 End
Reports until 21:11, Tuesday 19 April 2016
LHO VE
kyle.ryan@LIGO.ORG - posted 21:11, Tuesday 19 April 2016 - last comment - 09:21, Wednesday 20 April 2016(26668)
Kyle will check CR vacuum screen shot at some point between 0100 am and 0500 am


			
			
Comments related to this report
kyle.ryan@LIGO.ORG - 21:20, Tuesday 19 April 2016 (26669)
(Foggy memory) I think, the manual settings for CP5, CP6 and CP7 are currently lower than needed to maintain pump levels (more like 80%, 60% and 80% respectively?). 
patrick.thomas@LIGO.ORG - 21:26, Tuesday 19 April 2016 (26670)
Chandra is contacting Dave to see if they can be changed from offsite.
chandra.romel@LIGO.ORG - 00:27, Wednesday 20 April 2016 (26671)
Kyle - yes on those values. I trended the data over 30 days. Manual values were set very low.

I am at the lab. I've been simulating a PID with manual control of valve opening while watching real time trends. I manually filled CP5 as soon as I got here. Took about 19 min. to get to 100%. Then I adjusted valve settings in control room and decided to manually fill CP6 because it was dropping to below 85% (after raising valve level to 65%). I turned bypass valve half turn (with bypass exhaust valve open). The bypass LLCV is stuck open! I cannot close it. So I currently have the LLCV set to 0% and the bypass exhaust valve open. Pressure reads 0.0 psi. I'm waiting and hoping the liquid level falls below 100%. I'm not sure how 1/2 turn equates to LLCV percentages.
chandra.romel@LIGO.ORG - 01:30, Wednesday 20 April 2016 (26672)
I went back out to CP6. When bypass exhaust valve is closed, pressure reads 0.7 psi. I left it half way open. Pressure reads 0.1 psi. 

Level is still 100%+ with LLCV bypass valve stuck 1/2 turn open. I am guessing it is frozen open. The pipes there are really cold. Exhaust pipes are frosty.
kyle.ryan@LIGO.ORG - 01:41, Wednesday 20 April 2016 (26673)
Chandra - you're kind of weird chick - I like you.  We can now deal with this in the morning!  Keep in mind that we have past data to suggest that 60% full doesn't translate into off-gassing and that the pumps boil-off at ~2.5%/hour when LN2 flow is stopped altogether so we don't need to go full "Kyle" just yet.  Still, it i comforting to know that someone else is "sick" with worry about getting caught off guard regarding the 80K pumps!  
chandra.romel@LIGO.ORG - 02:05, Wednesday 20 April 2016 (26674)
I am breaking records for trips to CP6 in one night. Bad idea to partially close bypass exhaust valve. Lots of N2 vapor and liquid started pouring out both ends (pressure is ok). So I closed the main Dewar valve. Then I opened it just a half turn. Back to liquid and vapor pouring. So it's now fully closed. *Everything* is cold so I think the system will be safe until crew arrives in morning to try to thaw bypass LLCV. 

-Oh, just read your data, Kyle. Great! 2.5%/hr loss when main valve is closed tells me I can go home to bed!
john.worden@LIGO.ORG - 09:21, Wednesday 20 April 2016 (26680)

09:00 local time. I drove out to MIDX to check on the frozen valve. It is now free as the transfer line has warmed up overnight.

I left the dewar shutoff in the closed position and will leave it there until the CP6 level falls below 100%.

H1 General
nutsinee.kijbunchoo@LIGO.ORG - posted 21:05, Tuesday 19 April 2016 (26665)
Ops Eve Shift Summary

All time in UTC:

23:23 Kyle to EY VEA to write down some serial number.

23:26 Peter and Jason out.

23:46 Jenne and Ross to ISCT6

            Kyle's back

01:49 Noticed H0:FMC-EY_CY_H2O_PUMPSTAT alarm went off. Shortly after got an alarm for high temperature at EY. I called John. Timeseires of this channel around the time it went bad is attached below. The chiller went down at 1:13 UTC and back at 01:52 UTC when John turned the pump back on.

02:10 Ran the random walk script on PSL rotation stage so I can calibrate the calculated power and angle for Stefan.

02:26 Realized that I should have called and check with Jason. Turns out there's a beam dump on IOT2L that can only handle low power according to Cheryl's alog. The full power will go to the table if the IMC is unlocked. I stopped the script right away and asked for the RS to go to minimum power.

03:45 We deciede to call it a night. ALS guardian is complaining about communication issue and beat note strength. ISS is still acting up. IMC is left locked and power into the IMC is 1.9 W.

            In CDS land: H1:DAQ-FW1_UPTIME_SECONDS went white, came back for a while and went white again. I tried call Dave but no one answered.

            H1:VAC_MX_X1_PT_343B_PRESS_TORR alarm went off a couple times.

 

I also tried to fit the few data points I got from PSL rotation stage random walk script. I've attached a screenshot (second attachment). Parameter A and D seems to be hard coded and couldn't be overwrite on the medm screen (and caput) so nothing's changed.

         

Images attached to this report
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 20:47, Tuesday 19 April 2016 (26667)
DAQ reconfigured for new MX Beckhoff vacuum controls system, h1fw1 started late

The MX vacuum controls system was upgraded to Beckhoff this morning. I reconfigured the DAQ by:

I forgot to check if h1fw1 came back after the restart. It had not done so, but h1fw0 has ran with no restarts. I have just remotely restarted h1fw1.

Still to do: rename all the archived minute trend files on h1tw1

H1 PSL
stefan.ballmer@LIGO.ORG - posted 20:12, Tuesday 19 April 2016 (26666)
ISS issues

Peter, Keita, Stefan

The ISS is still acting up, so we tried to do some diagnostics.

First we had to adjust H1:PSL-ISS_REFSIGNAL to -1.78V to avoid running out of actuation  range. (The diffracted power RMS still seems bigger than before the upgrade - we now fluctuate between ~8% and ~23%). We also had to increrase the ISS gain to 9dB.

The ISS now initially seemed stable. But we were sitting at 22W into the IMC. Of course, that rotation stage is after the IMC. But nevertheless we noticed that when we reduced the selected power an oscillation appeared in the ISS, that sometimes manages to break the loop.

 

The attached plot shows the two ISS PDs with 3 traces each:

- Now with an oscillation at 2.5kHz

- Now, with no oscillation

- Before the laser upgrade (and with only the first loop closed)

 

Additionally, the out-of-loop diode (PDA in plot), sees a significant excess in sensing noise below 100Hz. And there are new peaks at ~950Hz and ~4.2kHz.

 

We are not really sure what couses all this, but one suspicion is scattered light from the high power beam dumps. Excess scatter noise could explain the difference between in and out-of-loop. Also, the abount of scattered light would likely be reduced when less power is dumped. We do not yet understand the 2.5kHz oscillation, which also seems to be moving around somewhat.

Images attached to this report
LHO VE (CDS, VE)
patrick.thomas@LIGO.ORG - posted 18:27, Tuesday 19 April 2016 (26664)
CP5, CP6, CP7 and CP8 need to be monitored
The vacuum controls at mid X were replaced with Beckhoff controls and the LLCV at end X and end Y were replaced with electric valves.

The PID control for these are not behaving, so I have set them all to manual at the following percent open:

CP5 60%
CP6 30%
CP7 50%
CP8 40%

The pump levels for CP6, CP7 and CP8 are at or above 100%. The pump level for CP5 is around 90%.
H1 ISC (ISC)
jenne.driggers@LIGO.ORG - posted 18:17, Tuesday 19 April 2016 (26663)
ISCT6 roughly aligned

[Jenne, Ross]

Using ITMX from a green-flashing alignment, and BS confirmed with Michelson fringes with the ITMY from a green-Y flashing arm, we've aligned the beam onto AS Air camera, as well as AS_A and AS_B.  Nutsinee is going to start an intitial alignment!

H1 IOO
cheryl.vorvick@LIGO.ORG - posted 15:57, Tuesday 19 April 2016 (26662)
IOT2L IMC REFL unlocked O2 power budget expanded

I've expanded the IOT2L power budget from the one I posted in alog 26390 to include all components in the beam path and maximum power levels (saturation/damage) for critical components.

I've attached summary of the IMC REFL unlocked power budget that includes only the O1 (22W), proposed O2 (50W), and future (200W) power levels.

Two components are highlighted in yellow in the proposed O2 columns:

The full documentation is uploaded to T1600107-v1.

Non-image files attached to this report
LHO General
thomas.shaffer@LIGO.ORG - posted 15:52, Tuesday 19 April 2016 (26631)
Ops Day Shift Summary

TITLE: 04/19 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Nutsinee
SHIFT SUMMARY:
LOG:

H1 SEI
thomas.shaffer@LIGO.ORG - posted 15:38, Tuesday 19 April 2016 (26661)
Cleared HEPI L4C WD Sat counts

Cleared the counts on the listed chambers and counts.

HAM2 - 71

HAM3 - 63

HAM5 - 1205

H1 General
jeffrey.bartlett@LIGO.ORG - posted 15:28, Tuesday 19 April 2016 (26660)
Install new Dust Monitor in DR
   Installed the new GT521S dust monitor in Diode room. Ran new vacuum tubing into DR for the new monitor and configured it for operations. Edited the SITEMAP to point to the new monitor code. Working on sorting out the network connection. 

   Shutdown the old vacuum pump and removed old vacuum tubing from the Diode room and the CER. 

Note: This is the last of the new GT521S dust monitors to be installed. Still have a couple of network connections to sort out to complete the upgrade project.  
H1 SUS
thomas.shaffer@LIGO.ORG - posted 15:26, Tuesday 19 April 2016 (26659)
Charge Measurements taken but no plots still

I took charge measurements today but could not make it through the Long_Trend.m due to some nds2 errors from some maintenance. The plots from ESD_Analyze_many.m looked good though. I will try again tomorrow.

H1 General
edmond.merilh@LIGO.ORG - posted 15:02, Tuesday 19 April 2016 (26658)
OpLev Lasers re-aligned

Ed, Keita

We re-aligned the OpLevs at for ITMY,ITMX, PR3 and SR3.

LHO VE
chandra.romel@LIGO.ORG - posted 14:34, Tuesday 19 April 2016 (26657)
CP 7 & 8 LLCV actuators - new!
John, Chandra

Removed and replaced pneumatic actuators on LLCV at CP 7 & 8 with electronic actuators. Actuators may be slightly overfilling until power is wired to device to retain auto feedback.

Richard is working on fabbing two 24 to 12 V boards to power them up.
H1 SEI
hugh.radkins@LIGO.ORG - posted 14:07, Tuesday 19 April 2016 (26656)
Maintenance Day BRSX--Works Pretty well

Similar to ETMY in that it works and has survived.

The attached trends shows six hours covering maintenance.  There are no status or control channels available for ETMX, yet.

The lower trace(H1:ISI-GND_BRS_ETMX_DAMPCTRLMON) is the velocity (sqrt angular velocity) and damping is automatically engaged when this signal exceeds 4200.  The turn off is more involved than BRSY but when this DAMPCTRLMON signal stays between 4000 and 4200 units, the damping is turned off after 15 minutes.  Again, it looks like it works well and has survived maintenance day abuse.  Nice.

Images attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 13:50, Tuesday 19 April 2016 (26655)
Maintenance Day BRSY--Works Pretty well

The automatic damping works and the BRS survives.

The attached 6 hours of trends show the BRSY rotation, and its rotational velocity in the bottom panels.  The upper panels display the Auto-damping turn on velocity and the DAMPBIT which indicates damping is on when high.

These traces show two periods where the damping was forced on by lowering the HIGHTHRESHOLD.  The damping is turned off 250 seconds after the velocity falls below the LOWTHRESHOLD.  The effectiveness of the damping is evident in the rotational angle and velocity peaks.

Further, in the middle time period, the cleaning crew entering the VEA sets off the Damping automatically and the amplitude and velocity are quickly reduced.

Also attached is the medm available from the Y-Arm ISI SITEMAP drop down.  I'll probably continue to tweek this so make suggestions if you see improvements.

Conclusion, things work pretty well, yeah!

Images attached to this report
H1 ISC
keita.kawabe@LIGO.ORG - posted 10:43, Tuesday 19 April 2016 - last comment - 13:43, Tuesday 19 April 2016(26650)
ITM OPLEVs are totally off

In the week of LVC there was a beam manifold vent (alog 26065). After the volume was pumped down, ITM oplevs were totally off and never came back (attached). (It should be grouting during that week, not the vent itself.)

Basically the beam is in a single quadrant, both for ITMX and ITMY.

It's the oplevs, not the mirrors themselves, as we went to a full power lock while the oplevs are off.

Don't enable oplev damping or do oplev-related measurements until they are centered again.

Images attached to this report
Comments related to this report
keita.kawabe@LIGO.ORG - 10:52, Tuesday 19 April 2016 (26652)

FYI, ITM OL damping has been on all the time. Even in the best case it shouldn't have helped anything, but it might have made things worse.

stefan.ballmer@LIGO.ORG - 13:43, Tuesday 19 April 2016 (26654)

Suppression spectrum for the ITMX_L2_OLDAMP_P loop. No effect at nominal gain.

Images attached to this comment
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