Displaying reports 71801-71820 of 83146.Go to page Start 3587 3588 3589 3590 3591 3592 3593 3594 3595 End
Reports until 12:58, Friday 02 May 2014
H1 CDS
david.barker@LIGO.ORG - posted 12:58, Friday 02 May 2014 (11689)
/ligo/svncommon files now editable by individual users

Sebastien found that individual users could not edit files under /ligo/svncommon. I have made the appropriate file/directory permission changes to permit this.

H1 CDS
james.batch@LIGO.ORG - posted 12:57, Friday 02 May 2014 (11688)
Modified user environment for OS X
Modified the user environment script for OS X to include /opt/rtcds/userapps/release/etc/userapps-user-env.sh
H1 CDS
cyrus.reed@LIGO.ORG - posted 12:45, Friday 02 May 2014 (11687)
Rebooted cdsxegw0

I rebooted cdsxegw0 at 11:35AM PDT to track down a problem with the console video (turned out to be a faulty KVM dongle).  Before the reboot I went ahead and applied the latest OS/security updates as well.

H1 PEM
corey.gray@LIGO.ORG - posted 12:11, Friday 02 May 2014 - last comment - 12:49, Monday 05 May 2014(11686)
Dust Monitor at HAM4 High Dust &

Have noticed odd behavior with the HAM4 Dust Monitor (listed as #1).  Have gotten MAJOR alarms for 0.3um particles (several hundred up to a few thousand counts!).  Conversely, 0.5um particles has been virtually 0 for days.  Mentioned high counts to Betsy before she went out to HAM4 today, and she mentioned that she only saw small counts out there on the floor.  So there seems to be a discrepency some where. 

Attached is a trend of the last 5-days.  Will send an email to Jeff B.

Non-image files attached to this report
Comments related to this report
betsy.weaver@LIGO.ORG - 12:49, Monday 05 May 2014 (11711)

This dust monitor looks to have fishy readings.  Why are there lots of particle counts of 0.3um size but 0 counts on the 0.5um size?  When I looked at the physical monitor a few times throughout the morning Friday, 0.3um always was reading ~10-30 counts, while 0.5um was reading 0.  There must be some calibration diff between what reads on the actual monitor screen and what reads out in the control room trend data.  Never-the-less, it's hard to think of how we could be dirty at 0.3 but not at 0.5.

H1 SEI
alexan.staley@LIGO.ORG - posted 08:50, Friday 02 May 2014 (11684)
ETMX seismic trip last night

We tripped the ETMX and ISI and HEPI las tnight when hitting load coeffiients on the suspension filters

this is Sheila

LHO General
corey.gray@LIGO.ORG - posted 08:26, Friday 02 May 2014 (11683)
Installation Meeting Minutes

Very short (under 5min meeting!)

LHO General (CDS, PEM)
patrick.thomas@LIGO.ORG - posted 08:26, Friday 02 May 2014 (11682)
restarted IOC for dust monitors in LVEA
Corey reported it went down around 10 PM last night. Telneting into the procServer for the IOC on h0epics restarted it. I burtrestored it to 9 PM last night.
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 08:19, Friday 02 May 2014 (11680)
CDS model and DAQ restart report, Thursday 1st May 2014

No restarts reported.

H1 ISC (SUS)
kiwamu.izumi@LIGO.ORG - posted 22:17, Thursday 01 May 2014 (11679)
ALS diff attempt: no luck yet

Stefan, Alexa, Sheila, Arnaud, Kiwamu

Since we have loaded the blend filters and plant inversion filters on ETMX QUAD, we tried the hierarchical control on ETMX in order to close the ALS diff loop with a high gain. We didn't really see a good sign of suppression yet.sad

What we did:

The commissioning of ALS diff continues. We will/should attack ALS diff more quantitatively.

H1 AOS (AOS)
alastair.heptonstall@LIGO.ORG - posted 20:54, Thursday 01 May 2014 (11678)
TCSy update
Alastair, Greg, Thomas

The laser on the TCS Y table was made operational today, giving a power output of 55W at 95% duty cycle.  However the laser controller (serial #1302122) was found to not function as it should.  This was confirmed by swapping the unit with the one from TCSx table.  There should be a spare unit (3 were shipped according to ICS) so we are working to track down the third one.  In the meantime we are able to make the laser function, though without the protection against the chiller being shutdown.  This should only be a temporary workaround if we really need to run the laser to do any alignment (ie it shouldn't be left unattended in this configuration).  Tomorrow we'll work on solving the problem with the controller and tracking down the spare.
H1 AOS
matthew.heintze@LIGO.ORG - posted 20:04, Thursday 01 May 2014 (11677)
TCSx update

Matt, Thomas, David H

 

Okay so maybe I was a little optimistic yesterday when I said I would be able to finish all the alignment today. Im closer to the end than I was yesterday but the alignment continues. No issues, its just a time consuming task.

 

Thomas has mounted the periscope gold mirrors into their mounts and roughly bolted the mounts onto the periscope

H1 SUS (ISC, SYS)
jeffrey.kissel@LIGO.ORG - posted 18:41, Thursday 01 May 2014 (11676)
Summary of ALS Diff Control Work Thus Far
J. Kissel, A. Pele, S. Ballmer, K. Izumi, S. Dwyer

We're slowly but surely chugging through implementation of a well-understood ALS DIFF control scheme. On Monday, I designed a control system that used the real ALS DIFF noise, the increased UIM driver strength, and 2 QUADs worth of actuation (see first attachment for design plots). Over the past few days, Arnaud, Sheila, Stefan, and Kiwamu have been measuring all the necessary transfer functions to confirm my model of the plant. I've compiled the results and attached the comparison of what we have thus far (see second attachment for comparison of model against measurement). There is excellent* agreement between model and measurement. We have installed the complementary distribution filters, and we're now fitting the measurement results to obtain plant inversion filters (as mine were just low-Q guesses, because I knew optical lever damping, different top-mass local damping, etc. would cause subtly different frequency dependence).

Of note: 
- *There is still a factor-of-4 discrepancy between the model and measurement at the test mass. Kiwamu and I have modeled the ESD in two different conceptual ways, and come up with the same factor of discrepancy. For now, we'll just accept the measurement as canon and move on, but it would be really nice to understand this mismatch.
- Unlike what I've modeled, Stefan has convinced me to go forward with inverting the frequency dependent plant to look like a 1 [Hz], Q=1 single pendulum transfer function, with a DC actuation strength of 1e-12 [m / ct]. 

The DC gains between the stages are as follows:
TOP: 4.769e-10  [m / ct_{TOP}]
UIM: 5.328e-11  [m / ct_{UIM}]
TST: 1.760e-13  [m / ct_{TST}]

For gain ratios of:
TOP / TST:  3.69e-4 [ct_{TOP} / ct_{TST}]
UIM / TST:  3.30e-3 [ct_{UIM} / ct_{TST}]
Non-image files attached to this report
LHO General
corey.gray@LIGO.ORG - posted 16:05, Thursday 01 May 2014 (11671)
Afternoon DAY Ops Summary

Taking over afternoon for Thomas

H1 SUS (SUS)
richard.mccarthy@LIGO.ORG - posted 15:25, Thursday 01 May 2014 - last comment - 16:37, Thursday 01 May 2014(11674)
ETMy ESD drive
Installed the ESD drive at EY.  The interlock to the Pressure Gauge functions properly.  Again had a problem the a Neg HV supply.  Similar to EX the unit powered up and worked for a while then tripped off and never turned back on.  Replaced it and everything seems to be working.  Drove excitations through the ESD out filterbank and saw signals on the oplev.  Left further testing to Kiwamu.  I was not completely satisfied with our results.

Comments related to this report
kiwamu.izumi@LIGO.ORG - 16:37, Thursday 01 May 2014 (11675)ISC

I was asked by Richard to check the functionality of the ESD of ETMY. As he wasn't satisfied with the behavior of the ESD, I wasn't satisfied either.

The attached is a note of how the test mass reacted against a positive DC voltage applied on each quadrant, observed by the optical lever:

The test mass reacted as if the UR and LR channels are swapped (or LL and LR are swapped). For example, applying a positive voltage on UR should pitch the test mass downward since UL pitches it downward, but it is not. Also the reaction of LL seemed a bit smaller than the others. Anyway, something is wrong apparently. Note that I applyed 125 k counts of offset on the DC bias.

Because we are now in a commissioning mood, we are not going to test this any further tonight. This should be assessed tomorrow morning or so.

Images attached to this comment
LHO General
thomas.vo@LIGO.ORG - posted 13:56, Thursday 01 May 2014 (11673)
05/01/2014 Morning Ops Summary
- Aidan turning on laser with enclosure locked to remain in laser safe, going to lock the intensity of the laser.
- Fil and McCarthy working on ESD at EY
- Hugh to the west bay test stand area
- Betsy to HAM4
- Dale to HAM4

Corey took over at 12:00 PM PT
H1 AOS (INS, SUS)
jason.oberling@LIGO.ORG - posted 13:41, Thursday 01 May 2014 (11672)
SR2 X, Y, Z Alignment Complete
IAS: J. Oberling
SUS: B. Weaver
 
We completed the position alignment of SR2 this morning.  The position errors are below.

I have started the setup for the SR2 pitch/yaw alignment (it differs from the position alignment) and hope to finish tomorrow morning so we can get a first look at SR2 pitch/yaw before the afternoon transition to laser hazard.

H1 AOS
thomas.vo@LIGO.ORG - posted 09:01, Thursday 01 May 2014 (11670)
05/01/2014 Morning Meeting Minutes
- SR Alignment is ongoing, adjustments still need to be made today and possibly onto tomorrow.
- CO2X was able to get the extinction ratio to 10,000:1 with the AOM in. HWS work is up next. 
- Commissioning still ongoing, same thing as yesterday.
- SEI work in the staging building on going, the put on balance masses yesterday.
- Possible prep work for ACB and MCB build in the west bay starting soon.
- Water was off for a bit this morning.
H1 TCS (TCS)
thomas.vo@LIGO.ORG - posted 08:42, Thursday 01 May 2014 - last comment - 10:24, Friday 02 May 2014(11669)
CO2X Rotation Stage Work
Patrick Thomas, Thomas Vo

We checked the CoE parameters in the Beckhoff system manager and verified that they matched the same values as those for the PSL rotation stage.
We went out to the TCSX table and used medm on a laptop to move the rotation stage.
The rotation stage would move again, but not to the requested angle.
We power cycled the Beckhoff chassis twice. (We weren't sure we left it off long enough the first time.)
We tried to move the rotation stage again. It moved to the correct requested angle.
A motor warning was reported and the rotation stage would no longer move.
Thomas forced the motor warning variable in the PLC to FALSE, which allowed the stage to start working again.  It was decided in the code review that we will only stop the motor on motor errors not warnings.  The strange thing is that the motor is working pretty well now even if I don't force the warning to be false.  The long term solution to the problem of why motor warnings stop the stage is not quite figured out yet but it seems to be working now.  Also, we don't know why the stage was moving in opposite directions, but rebooting the chassis worked to fix the problem.


Interlock:
We noticed that the medm readback for the safety interlock indicated that the rotation stage was locked out, but it was still able to move and the interlock jumper has no effect on the status on the MEDM screen.  We think it's a problem with the Beckhoff wiring or software because we tested the continuity of the interlock signal in the on/off state (closed with jumper in, open with jumper out) from the floor all the way to the CER up till the Beckhoff chassis and it looked normal to us.  For now, we can just remove the interlock signal from the MEDM screens so it doesn't confuse people
Comments related to this report
patrick.thomas@LIGO.ORG - 10:24, Friday 02 May 2014 (11685)
This was done on Tuesday, April 29.
Displaying reports 71801-71820 of 83146.Go to page Start 3587 3588 3589 3590 3591 3592 3593 3594 3595 End