Displaying reports 72961-72980 of 83068.Go to page Start 3645 3646 3647 3648 3649 3650 3651 3652 3653 End
Reports until 12:36, Friday 28 February 2014
H1 CDS
david.barker@LIGO.ORG - posted 12:36, Friday 28 February 2014 (10413)
/ligo file system stopped NFS exporting

Cyrus and Dave

around noon the /ligo file system became unavailable, causing the workstations to freeze up. We rebooted cdsfs0 and restored the file system. We are in the process of restarting the workstations to give them a clean NFS mount.

H1 General
stefan.ballmer@LIGO.ORG - posted 12:08, Friday 28 February 2014 - last comment - 13:22, Friday 28 February 2014(10412)
sad


			
			
Images attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 13:22, Friday 28 February 2014 (10416)CDS, SYS
Seconded.
H1 AOS (AOS, SEI, SUS)
douglas.cook@LIGO.ORG - posted 11:48, Friday 28 February 2014 - last comment - 12:55, Friday 28 February 2014(10410)
IAS check of "coarse" position of the ETMy looks good
(Doug, Jason, Hugh, Betsy and CO)
First look at the ETMy in chamber measurements are very encouraging. 
Results:
Longitudinal was short by 0.5mm from absolute, tolerance is +/- 3.0mm,
Lateral position is 0.35mm to the south, +/- 1.00mm
Elevation position is high by 0.35mm, tolerance is +/- 1.0mm

Optic is set lightly on EQ stops, but for a first look to identify any need to move the ISI or SUS this is very reasonable results.

The arm cavity baffle was rough positioned to accommodate the line of sight from the spool and currently rests unattached on its installation table so use caution when working around it.

When fully pay loaded, cabled with the ETM suspended we will do the the fine alignments of the positions and optic angles
Comments related to this report
douglas.cook@LIGO.ORG - 12:04, Friday 28 February 2014 (10411)
Forgot to mention that the particle counts were 3-4 counts on the .3 microns scale and 1-2 counts on the .5micron scale at the spool while we occupied that area.

Kudos to the folks that keep the VEA clean and well stocked with garb and cleanroom supplies.
jason.oberling@LIGO.ORG - 12:55, Friday 28 February 2014 (10414)

The vertical position is actually high by 0.9 mm, not by the 0.35 mm originally stated.

LHO VE
kyle.ryan@LIGO.ORG - posted 11:25, Friday 28 February 2014 (10409)
PT499 instrument air alarm -> people working in vacinity accidently closed valve to transducer -> opened valve -> OK


			
			
H1 SEI
jeffrey.kissel@LIGO.ORG - posted 11:02, Friday 28 February 2014 (10408)
The Three new Sets of ST1 Blend Filters for BSC-ISIs
J. Kissel, for F. Matichard,

As mentioned in LHO aLOG 10397, Fabrice has installed a clean set of three blend filters on ETMX, ITMX, and BS. (I loaded ITMX filters this morning). Here're plots of the new blend filters for ST1 BSC-ISIs. 
"TCrappy" is exactly the same -- a version virtually identical to Ryan DeRosa's very-low-blend filters, 
"Start" are an improved "750mHz" that *actually* rolls off at high-frequency and does not include the T240s. 
"TStart" has the same displacement sensor / inertial sensor 750mHz crossover, but includes the T240s to get rid of L4C noise at low frequency.

The plan is to use "TCrappy" when possible, and "TStart" under high wind conditions.

7:00 pm PT EDIT:
I've now added the filters for both stages in all degrees of freedom for a BSC-ISI. I've done this using a newly committed version of
/ligo/svncommon/SeiSVN/seismic/Common/MatlabTools/plot_current_blends.m
Use it. All the time. When ever you install a new set of blends.
Non-image files attached to this report
H1 PSL (PSL)
thomas.vo@LIGO.ORG - posted 08:20, Friday 28 February 2014 (10403)
2014-02-28 PSL Check
At 16:20:23 UTC

PSL-Status:
- Laser is on
- Output Power = 28.8 W
- Watchdog is good.
- System Status is good

PMC:
- Locked for 2 days 20 hours
- PowerRefl = 1.1  W
- PowerTran = 10.8 W

FSS:
- Locked for 1 h 12 m, relatively unstable yesterday afternoon
- Resonant Threshold = 0.7 Volts

ISS:
- Diffracted Power = 6.134%
- Last saturation event was 1h 14 mins ago.
H1 IOO
yuta.michimura@LIGO.ORG - posted 07:31, Friday 28 February 2014 (10402)
MC WFS has gone crazy over night

Stefan, Kiwamu, Yuta  (Yes! I have ligo.org account now!)

Last night, MC could not acquire lock after the guardian update for HAM2 and HAM3. So, Evan and I turned off the MC WFS loop and tweeked MC2 alignment offsets to lock MC. After that, we turned on the MC WFS loop and it seemed OK. H1:IMC-MC2_TRANS_SUM_OUT was ~635 and H1:IMC-IM4_TRANS_SUM_OUT was ~1600.

However, the WFS loop for MC2 was actually not turned on because the switch in the filter bank H1:SUS-MC2_M1_LOCK_(P|Y) was turned off. This was actually the cause of MC2 misalignment. Also, MC input PZTs were turned off (H1:IMC-PZT_(PIT|YAW)). So, MC WFS went crazy over night.

So this morning, we relieved the feedback for MC2 (H1:IMC-MC2_PIT|YAW) to be zero. This MC WFS relief should be added to MC guardian.

H1 SEI
kiwamu.izumi@LIGO.ORG - posted 06:18, Friday 28 February 2014 (10401)
engaged HEPI and ISI for ITMX and ITMY

Stefan, Kiwamu

We noticed that HEPI and ISI for ITMX and ITMY had been down. So we brought them back up. We didn't investigate why they had been down.

Also, engaging the ITMX ISI was rather difficult -- we had to take out the offsets in the T240 signals by manually changing the bias targets.

H1 SUS
kiwamu.izumi@LIGO.ORG - posted 05:32, Friday 28 February 2014 - last comment - 08:54, Friday 28 February 2014(10400)
save misaligned command doesn't work

Help us, Arnaud. crying

The "save misalgined" command in IFO_OVERVIEW screen doesn't work for ITMX. I didn't check other suspensions. Please have a look when you have a chance.

Comments related to this report
arnaud.pele@LIGO.ORG - 08:54, Friday 28 February 2014 (10405)

The script align_save script running behind medm seems to work ONLY when the sitemap is opened from the terminal.

H1 SEI (SEI)
fabrice.matichard@LIGO.ORG - posted 01:47, Friday 28 February 2014 (10397)
SEI Status

I am summarizing here recent progress on SEI units, and providing guidelines regarding what needs to be done next week.

Besides Guardian work on HAM-ISI (see Jamie's reports),  most of the work has been focused on BSC-ISI units:

 

Blend Filters for the BSC-ISI

We have started to standardize the blend configurations. There are three sets of blend filters that we selected as useful for commissioning and/or operations. They are:

- A set of blend filters called "Start". This filter has a 750 mHz blend frequencies in all degrees of freedoms. It doesn't include the T240. It will be used to turn on the BSC-ISI units. Unlike other "750 mHz" blend filters used in the past, this one provide adequate CPS low pass filtering to not short cut passive isolation.

- A set of blend filters called "T750 mHz". It is based on the same set of complementary filters as "Start", but includes the T240s.

- A set of blend filters called "Tcrappy". This set of blend filters is based on Ryan's noise analysis and filter design work. It has been slightly degenerated to fit into one filter bank and therefore be compatible with our "turn on scripts". Rich  named it "TCrappy"  to emphaisze that it still needs to be refined.

All other sets of blend filters previously tried at LHO can't provide adequate isolation. We are in the process of removing them from all BSC-ISI units filter banks (see status chamber per chamber below).

 

BSC-ISI Conrtrol configs

We currently have two pretty good configurations that we are populating in all chambers:

Config 1:  TCrappy on Stage 1 and Stage 2

Config 2:  TCrappy on Stage 1, T750 mHZ on Stage 2, and sensor correction form Stage 1 to Stage 2.

See ETMX for an example of results comparison.

 

ETMX

- The three standard set of blend filters have been loaded in FM0, FM1 and FM2 respectively. All other blend filters have been removed.

- The sensor correction from Stage 1 to Stage 2 has been installed. Preliminary gain matching has been done. I found a gain of 1.15. A 15% calibration is a bit surprising. To be checked. It gives good results anyhow.

The top left plot of "ETMX.png"  shows Stage 2 motion measured by the GS13s  in the X direction.

The bottom left plot attached shows optical lever pitch motion, amplitude spectrale density.

The bottom right plot attached shows optical lever pitch motion, RMS.

The red curves are references with damping only.

The brown curves show the motion with the "config 1" (Tcrappy everywhere). It reduces the optical lever RMS motion from 600 nrads to 40 nrads.

The magenta curve shows the motion with the "config 2" (Tcrappy, T750 and Sens Cor). It reduces the optical lever motion from 600 nrads to 30 nrads.

It is interesting to note that the two configs offer very different compromise as seen by the GS13s. TCrappy provides better isolation at the Quad's pitch frequencies (~0.45Hz), but the sensor correction config provides a slithly lower RMS. It makes me think we have room to improve the compromise between the feedback and feedborward controls parameters.

No big winds in the past few days, so we'll have to wait to find out wether config 2 behaves well under high wind conditions.

To be done next on this unit :

- tilt decoupling on Stage 2. I have made a template in data/transfer_functions/Isolated. It uses filtered white noise designed to increase the SNR at frequencies of interest and speed up the measurement.

- gain matching optimization for the sensor correction

- Control levels 3

 

ITMX

The blend filters have been written into the filter file tonight. However, the filters have not been loaded yet to not disrupt ongoing decoupling measurements on the quad.

To be done next on this unit :

- loading the blend filters and  test them

- Stage 2 tilt decoupling

- Sensor correction gain matching

 

BS Status

- The three standard sets of blend filters have been loaded in FM0, FM1 and FM2 respectively. All other blend filters have been removed..

- The sensor correction from Stage 1 to Stage 2 has been installed, but no gain matching has been done yet.

- The "BS.png" plot shows Stage 2 motion measured by the GS13s  in the X direction. The red curves show the motions with both stages damped. The blue curve shows all the badness that was induced by the old set of blend filters. The green curve shows what we have with the new set of "Start" filters. The brown curve shows the motion in the "Tcrappy" configuration. The pink curve shows the motion with the "Sensor Correction".

- We have studied the BSC-ISI saturations occuring during the lock acuisition process. It has been reduced for the level 1 controller. We have good insight as for making further improvements.

To be done:

- tilt decoupling on Stage 2

- gain matching for the sensor correction

- Control levels status -> to be checked with Jim and Hugh

 

ITMY

Sheila encourages us to work on this unit as soon as possible, before it gets extensively used for IFO activities. It should be one of the top priorities for next week.

 

Control Scripts:

I have made V4 folders for BS, ITMX and ETMX

Made and commited modifications to routine 6.

 

A general comment I am posting here for the records:

We need indicators at the top level screens showing whether electronigs are in the good gain and whitening states. I got caught several time in the past days.

 

Hugh and/or Jim, Jeff, Arnaud would know details I may not have captured here. Sebastien will be there to help next week.

Images attached to this report
H1 SUS
arnaud.pele@LIGO.ORG - posted 23:30, Thursday 27 February 2014 - last comment - 05:14, Friday 28 February 2014(10396)
ETMX and ITMX TF

Top length to test mass pitch/yaw measurements for L2P and L2Y decoupling on ETMX and ITMX were (re)started and will run overnight. The cavity is curently locked on green with ITMX and ETMX BSC-ISI running with ST1 Isolated in level 3. ITMX measurement is running in the background (with the diag -f command) on opsws1, and ETMX is running on opsws6 with DTT open.

RED TEAM : ITMX measurement should be done before 5am tomorrow. If ETMX is still running PLEASE PAUSE THE EXCITATION before misaligning it

Thanks to Alexa's instructions, locking the cavity with the green laser was fairly easy. Although few things to notice in the process :

- IMC guardian should handle turning on MC2 M2 and M3 length feedback switches. They were off when Evan and Yuta tried to lock the mode cleaner.

- Since the green beam was nicely centered when the ITMX BSC-ISI was damped, the ST1 CPS offsets were reset and stored as targets. (Otherwise it would ring up the T240 when isolating, and trip the WD).

Comments related to this report
kiwamu.izumi@LIGO.ORG - 04:59, Friday 28 February 2014 (10398)

ETMX TF measurement is done -- I don't see any excitation in the MEDM screen and there is no active diag process running on opsws6.

So I misaglined it by the guardian.

 

ITMX TF is still running. Note that opsws1 crashed but the process is still running. You can see it runing by sshing to the workstation.

kiwamu.izumi@LIGO.ORG - 05:14, Friday 28 February 2014 (10399)

We found that the excitation at ITMX was still at 10 Hz which means the measurement didn't progress over the past hours at all. We determined that diag was not a healthy state and therefore we killed the process.

H1 AOS
douglas.cook@LIGO.ORG - posted 16:11, Thursday 27 February 2014 - last comment - 10:54, Friday 28 February 2014(10393)
IAS euipment ready for the first look at ETMy
Jason and I are ready for the lateral and longitudinal ETMy position measurements in the AM. We won't know whether we will need to tweak the ACB position for any line of sight issues until the first look. Thanks Betsy and Travis for setting the ACB for us (temporary setup). We will not release the optic suspension for the fine positioning until we are satisfied that no large moves are needed.
Comments related to this report
travis.sadecki@LIGO.ORG - 08:52, Friday 28 February 2014 (10404)

Credit where credit is due: Mitch and Jim "installed" the ACB.  Betsy and I just uncovered the SUS and mounted the corner cube.

betsy.weaver@LIGO.ORG - 10:54, Friday 28 February 2014 (10407)

For posterity - the ACB is sitting on the ACB "table" in the tube section between the chamber and the spool.  This is to enable the IAS sighting of the ETMy optic without the ACB blocking the view while it is parked in the tube before install.  We chose not to install the ACB on Stage 0 because it blocks access to the 3rd blocked side of the QUAD making alignment and sensor tuning extremely difficult.  The ACB will be installed on Stage 0 after a few rounds of this is complete.

H1 SUS
betsy.weaver@LIGO.ORG - posted 15:42, Thursday 27 February 2014 - last comment - 10:07, Friday 28 February 2014(10389)
WBSC10 ETMy SUS cables

While in the chamber, we also connected the 5 SUS and 1 ring heater cables to the feedthru and confirmed signal throughput on the 5 sus.  We pulled the C3 covers from both of the ETMy and TMSy suspensions before installing the corner cube. 

 

Jason and Doug should have a clear shot of the corner cube (and probably the edges of the optic) through the ACB from the spool.  We await X,Y,Z measurements.

Comments related to this report
betsy.weaver@LIGO.ORG - 10:07, Friday 28 February 2014 (10391)

In-vacuum ETMy SUS cable serial numbers:

 

Floor 1 of CB  D1000225-S1104879 to D1000234-88"- 941

Floor 2 of CB  D1000225-S1l04881 to D1000234-88" - 942

Floor 3 of CB  D1000225-S1104882 to D1000234-88" - 940

FLoor 4 of CB  D1000225-S1104880 to D1002522 - 924

 

Floor 1 of CB  D1000225-S1104883 to RH cable

Floor 2 of CB  D1000225-S1104878 to D1002522 - ? (ETMy L2 stage)

 

All are plugged into feedthrus on the F3 port of the chamber as per the WBSC10 D1200111 cable routing doc.

H1 TCS (TCS)
thomas.vo@LIGO.ORG - posted 14:14, Thursday 27 February 2014 - last comment - 13:08, Friday 28 February 2014(10378)
ITMY Ring Heater
The readback channels for the corner station ring heaters seem to not have been working properly since last Friday.  I've attached a graph that shows that the ring heaters seem to have turned off at 02-21-2014 22:5:32 UTC.  Judging from the ALOG around that time, there were a lot of reboots going on in software, I'm not sure about hardware reboots.  However, Kiwamu says that the PRC power level is looking like the ring heaters are on just based off of the amount of loss he measured.  He also advised that since the system is working well, I should hold off on trying to power cycle the TCS chassis until a later time but at the first chance I get, we should try to resolve this issue.

The ITMX ring heater is also displaying similar weirdness, which is expected since they share the same chassis and PLC.
Images attached to this report
Comments related to this report
thomas.vo@LIGO.ORG - 13:08, Friday 28 February 2014 (10415)
Kiwamu, Sheila, Thomas

This morning seemed to be a good time to investigate this issue.  At first we saw that the PLC3.pro was connected to EPICS but not to the System Manager, i.e. the ADC channels were not getting from the hardware to the TwinCAT software.  We tried re-running the install scripts but it did not fix the problem but it did help us figure out that there were some channels deleted recently.  Daniel let us know that if there are some additions or deletions, we should re-map the configuration before recompiling.  This solved the problem!
H1 ISC
jaclyn.sanders@LIGO.ORG - posted 13:07, Thursday 27 February 2014 - last comment - 10:19, Friday 28 February 2014(10382)
COMM PLL repairs

(Alexa, Jax, Stefan)

Alexa was trying to hunt down a missing gain factor for her model and instead found a busted COMM PLL board (serial number S1200564). The op-amp for the VCO compensation stage (U37) was blown. I recalled replacing the same op-amp on the DIFF PLL about a month ago, suggesting that there's something that makes this particular op-amp vulnerable. After discussing with Richard McCarthy, we opted to change resistor R96 from 0 to 2k ohms to protect the poor thing. Lab tests show that it's in good shape, and it'll be back to the ISC rack as soon as we're done with the ISC meeting.

Comments related to this report
peter.fritschel@LIGO.ORG - 13:51, Thursday 27 February 2014 (10384)

Should this resistor change be propagated to all PLL boards?

jaclyn.sanders@LIGO.ORG - 13:56, Thursday 27 February 2014 (10385)

No, we're still thinking about it. It's going in as modified and if it keeps having problems, we'll burn that bridge when we get to it.

jeffrey.kissel@LIGO.ORG - 10:19, Friday 28 February 2014 (10406)
This smells of an ISC integration issue so we don't forget...
Displaying reports 72961-72980 of 83068.Go to page Start 3645 3646 3647 3648 3649 3650 3651 3652 3653 End