Displaying reports 68841-68860 of 83224.Go to page Start 3439 3440 3441 3442 3443 3444 3445 3446 3447 End
Reports until 16:50, Friday 31 October 2014
H1 AOS
evan.hall@LIGO.ORG - posted 16:50, Friday 31 October 2014 (14785)
PR3 oplev now aligned

Doug, Sheila Evan

We used the stage controller to align the PR3 oplev to <0.1 urad in yaw and pitch.

The dip switch board for PR3 now has the serial number H202. There are already H201, H203, and H204 in the oplev cabinet by the PSL. Other unlabeled boards should probably be assigned serial numbers accordingly.

H1 SUS (AOS, SEI)
jeffrey.kissel@LIGO.ORG - posted 16:17, Friday 31 October 2014 (14782)
End-station Optical Lever Configuration Switch Status
J. Kissel

I've collected all the information necessary to reproduce the corner-station optical lever status report (see LHO aLOG 14749) for the end-station levers. I attach pictures, and tabulate info as before below.

Rack          Board      Optical Lever    Config Board  |------------------ Switch Status ----------------|    Centered?    Raw Segment Counts
              Number                       Installed?    Board    Switch                                        
                                                        CH Name   CH Name    Function    HI   LO    ON/OFF       

SUS H1-R2       1          ETMX               Yes          B0       1       +24 [dB]     X            OFF          No*      *SUS is Misaligned, 
  (pg 1)                 (pgs 2-3)                         B1       2       +12 [dB]     X            OFF                   so can't get info
                                                           B2       3       +6  [dB]          X       ON                
                                                           B3       4       +3  [dB]          X       ON
                                                           B4       5       (1:10)       X            OFF
                                                           B5       6       (1:10)            X       ON
                                                           B6       7       (1:10)       X            OFF
                                                           B7       8       Latch        X            OFF
                                                              Total ETMX TF = (1:10), G = +9 [dB]
 
                2          none               Yes          N/A                                                     N/A

SUS H1-R2       1          ETMY               Yes          B0       1       +24 [dB]     X            OFF          No*      *SUS is Misaligned
  (pg 4)                 (pgs 5-6)                         B1       2       +12 [dB]     X            OFF                   so can't get info
                                                           B2       3       +6  [dB]     X            OFF               
                                                           B3       4       +3  [dB]     X            OFF
                                                           B4       5       (1:10)            X       ON
                                                           B5       6       (1:10)            X       ON
                                                           B6       7       (1:10)       X            OFF
                                                           B7       8       Latch        X            OFF
                                                              Total ETMY TF = (1,1:10,10), G = 0 [dB]
 
                2          none               Yes          N/A                                                     N/A

I can confirm that any whitening stages have been correctly compensated for digitally. In addition, recall that ETMX is compensating for the gains shown above, but it's not necessary. Will fix all the levers and compensation on some (glorious) day (hopefully soon) when the IFO isn't needed.
Non-image files attached to this report
H1 General
jeffrey.bartlett@LIGO.ORG - posted 16:05, Friday 31 October 2014 (14783)
Ops Shift Summary
LVEA: Laser Hazard
Observation Bit: Commissioning

08:00 Alarm on Mid-X Instrument Air; informed the vacuum group
08:18 Aidan – In LVEA to check TCS laser
08:40 Travis – Going to both end stations to work on PCal cameras
08:55 Robert & Sudarshan - End-X to work on PEM
09:00 King Water – On site for water sampling
09:25 Bubba – Repaired Instrument Air compressor at Mid-X
09:30 Filiberto – End-X to work on PEM cabling 
10:05 Jodi & Gary – At Y-End
10:45 Betsy & Sheila – In LVEA for quick survey
13:05 Alistar – Working on TCS in LVEA
13:30 Dave – DAQ restart
14:38 Jeff K. – Going to X & Y end stations to take pictures of OpLevs
15:18 Robert – In the beam tube enclosure between Mid and End-Y
H1 PEM (PEM)
dale.ingram@LIGO.ORG - posted 15:52, Friday 31 October 2014 (14781)
Friday Seismic Forecast
Hanford transportation will operate during swing shift tonight, 10/31.  There's no indication that site crews will work over the weekend.  Over the last two weeks there's been some day-to-day variation in the number of containers moving in and out of ERDF because of high winds.  Transportation and rubble pit operations apparently aren't affected much by rain.
H1 SEI
hugh.radkins@LIGO.ORG - posted 15:39, Friday 31 October 2014 (14780)
WHAM2 HEPI Cartesian Plant Changes with corrected Matrices

In preparation to correcting the Matrices on HEPI for HAM2, I generated new Plants to see if they'll be too different for the generic controllers.  Here are the Symmeterized L2L & C2C,the latter equivalent to the plant with a HEPI Position loop blend (1,0.)  The L2Ls are the same as the previous (data from 4 Sept 2013) since I did not collect new data.  But the C2C are different.  Attached are two pdf with all the plots to compare.

Bottom line--asside from the VP dof at DC, they all look pretty much the same and I think the generic loops will be fine.

Non-image files attached to this report
H1 SEI (DetChar)
krishna.venkateswara@LIGO.ORG - posted 14:29, Friday 31 October 2014 - last comment - 10:19, Wednesday 05 November 2014(14779)
ETMX HPI controller change improved Stage 1 X low frequency performance

This is related to Hugh's log 14774. To elaborate a bit on Hugh's log, I made a measurement with Stage 1 Damped only and HPI isolated. The first plot shows the GND_T240_X ,  ST1_T240_X  and HPI L4C (out of loop witness). There was no coherence with ground below 0.1 Hz but there was significant coherence with HPI L4C. This meant that HPI was somehow introducing excess low-frequency motion.

We then did the same measurement on ETMY and saw no such excess motion. The second pdf shows the corresponding measurement. Stage 1_Y was very coherent with ground_Y. Jim mentioned he had modified the HPI controllers on ETMY as described in Hugh's log, so we decided to try the same on ETMX in X and Y.

This has made a significant difference to the low frequency performance of Stage 1 as shown in the third file. Performance below 0.1 Hz is much closer to ground motion now.

Non-image files attached to this report
Comments related to this report
jim.warner@LIGO.ORG - 08:06, Monday 03 November 2014 (14784)

Some more plots of the old vs new isolation filters, per Jeff's request. I dug into the foton file to find numbers to back up what I thought the original design was. The gains of the old and new foton filters are shown in the first image, they show that not much was done to the filter design, just that the gain was reduced. Solid lines are the old design(higher gain, UGF), dashed lines are the current design. Second and third images are the currently installed plant design and a reconstruction of the orignal design (no plots were found from the original design from earlier this year). The solid and dashed orange lines tell most of the story, mostly we just cut the UGF to 2hz, and modified the boost to get more phase margin. No idea why this affect the very low frequency noise, Jeff and Krishna suggested maybe we were re-injecting IPS noise with the higher gain.

Images attached to this comment
hugh.radkins@LIGO.ORG - 08:04, Monday 03 November 2014 (14803)

Here is another look at the controller with the amplitude scale zoomed out to see the lowest frequencies of the open loop.

Images attached to this comment
krishna.venkateswara@LIGO.ORG - 10:19, Wednesday 05 November 2014 (14863)

J. Warner, K. Venkateswara

We repeated this measurement today and did not see the same results. Sensor correction was off. The attached pdf shows the before (old controller) and after (new low gain UGF controller) data. Very strange. We may have been fooled by different ground motion or perhaps by sensor correction. There is good coherence with ground till ~60 mHz in either controllerconfiguration.

Jim has reverted to the new low gain UGF controller as it should help with ringing of HEPI at 9 Hz.

Non-image files attached to this comment
H1 CDS
david.barker@LIGO.ORG - posted 14:06, Friday 31 October 2014 (14776)
SUS-DRIFTMON: h1susauxh34 modified, DAQ restarted

Dave, Jeff [WP 4927]

the h1susauxh34 model  was modified to add EPICS channels to support the SUS Drift Mon program. The model was restarted at 13:22 and the DAQ was restarted to resync at 13:32. It was not a clean DAQ restart, mx-streams had to be restarted on h1pemmx, h1pemmy, h1susex and h1susauxex.

I reverted out my local changes to the driftmon files (changes needed when we didn't have the supporting epics channels) and svn updated this code to the latest version.

The Driftmon MEDM is linked to the SITEMAP via the SUS button on the left-hand block (see attached)

The python script to update the alarm levels is in the general search path. To run it to update all suspension the command is

driftmon_update.py H1 -H nds2.ligo-wa.caltech.edu -P 31200 -l 3600 -d 600 --minor-stdev=4 --major-stdev=5 --all

This gets data starrting one hour ten minutes ago up to one hour ago.

This closes out WP 4927.

Images attached to this report
H1 DAQ (CDS, DAQ)
keith.thorne@LIGO.ORG - posted 14:00, Friday 31 October 2014 (14775)
Commissioning and science frame fast-data rates at LHO (corrected)
The ever eagle-eyed Peter Fritschel found some duplicate PEM channels in my list of science-frame channels (see earlier aLOG entry 14718).  I had failed to remove an old channel list (H1PEML0.ini) from the compilation.  I redid all the files and tables after that change (see attached rate, channel list files). The commissioning-only counts did not change, as all PEM are in both frames)

I have posted the updated FrameRates spreadsheet and PDF of science, commissioning frame counts.

The science-frame H1 PEM rate drops from 6.79 to 4.19 MB/s (uncompressed). This is still equal to all the ISC channels (LSC,ASC,OMC,OAF,ISC).
Non-image files attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 13:52, Friday 31 October 2014 - last comment - 14:26, Friday 31 October 2014(14774)
WBSC9 ETMX EndX HEPI X & Y Isolation Loop Boost's Gain 'UGF' Lowered

Jim Krishna Hugh

The gain was too close to the UGF and there was very little margin.  The zero in the boost where it meets the main controller was lowered from 1.75 to 0.75 hz.  This lowered the boosted gain but it is only a position loop anyway.

Comments related to this report
hugh.radkins@LIGO.ORG - 14:17, Friday 31 October 2014 (14777)

Here is  before and after plots--it seems pretty obvious that this was a problem.  Very interesting how it affects things below 100mHz--see Krishna's alog.  The first is before, the second after the change.--Need to svn the foton file.

Images attached to this comment
H1 CDS (SUS, SYS)
david.barker@LIGO.ORG - posted 10:56, Friday 31 October 2014 (14772)
Created Suspensions Guardian States Overview MEDM screen

I have created an MEDM showing the Guardian states for each suspension. It is linked from the SITEMAP screen through the GRD pull down menu.

Images attached to this report
H1 SEI
jim.warner@LIGO.ORG - posted 10:33, Friday 31 October 2014 (14771)
Tilt Decoupling revisited at ETMX

Earlier this week I revisited tilt decoupling at ETMX. I thought that maybe since the local to cart matrices had been modified since the tilt decoupling was done, maybe the align elements would need tweaking. Happily (or not as I had hoped this would explain why Krishna's tilt subtraction wasn't working as well as it could) everything stil looks pretty good. Attached plots are for X, first is the tilt measurement, red off, blue on. Second pic is the flex modes from the T240s for the tilt off measurement, they didn't appear to change for on or off. I did Y as well. Everything is in the ETMX/Misc/TIlt_Decoupling folder of the SVN.

Images attached to this report
H1 General
jeffrey.bartlett@LIGO.ORG - posted 10:06, Friday 31 October 2014 (14770)
08:30 Meeting Minutes
TCS: Aidan is leaving today. Alistar will continue TSC commissioning next week.
PEM: Filiberto pulling PEM cables at both end stations.
PCal: Travis will be working on PCal cameras at both end stations.  
Commissioning: In addition to general commissioning, Keita is working on the PR2 clipping problem.     
Charge Testing: Rai W. continues working on charge testing experiment at End-Y. 
H1 SEI
jim.warner@LIGO.ORG - posted 09:39, Friday 31 October 2014 (14769)
Something strange with BS HEPI sensor correction

Last night, we tried Z HEPI sensor correction on the BS. It did not go well. When I look at the data this morning, I didn't see the usual reduction in Z motion on the ISI seismometers, with low frequency re-injection. Instead, all we got was bad low frequency reinjection. The attached PDF shows performance from last night on the first 2 pages, with perfromance from the previous night on the last 2. The attached png shows the coherence between the ground STS and the ISI's St1 T240's. The solid lines are with sensor correction on, dashed are with sensor correction off. For some reason turning on Z sensor correction reduces coherence in the Y direction. Jeff and Fabrice have both suggested that maybe the op-lev damping is interfering with the sensor correction. The ground STS that was used for the sensor correction also is having issues, which Hugh has noted before. We'll keep digging.

Images attached to this report
Non-image files attached to this report
H1 SEI (SEI)
fabrice.matichard@LIGO.ORG - posted 09:31, Friday 31 October 2014 (14767)
Some near 10 nRad angular motion results...

The table below shows a comparison of the optical levers motion meaured during the five mornings of this week. We used ETMX to evaluate several configurations:

- Monday Oct 27, 3am - 4am, ETMX Stage 1 Z in Low Blend, Sensor Correction Off

- Tuesday Oct 28, 3am - 4am, ETMX Stage 1 Z in Low Blend, Sensor Correction Off

- Wednesday Oct 29, 3am - 4am, ETMX Stage 1 Z in High Blend, Sensor Correction Off

- Thursday Oct 30, 3am - 4am, ETMX Stage 1 Z in Low Blend, Sensor Correction On

- Friday Oct 31, 3am - 4am, ETMX Stage 1 Z in Low Blend, Sensor Correction On.  BS sensor correction also ON (BS servo still engaged)

 

(Jim, please correct if my description of the controls configurations is inacurate)

 

Results: optical levers RMS motion

                               ETMX  (Pitch/Yaw)       Other test masses average (Pitch/Yaw)           BS - Op Lev servoed (Pitch/Yaw)

Monday                    15nrad /20nRad                     30nrad / 30nRad                                      20nrad / 10nRad

Tuesday                    20nrad / 35nRad                   35nrad / 35nRad                                      15nrad / 35nRad

Wednesday               100nrad / 15nRad                  40nrad / 35nRad                                      15nrad / 10nRad

Thursday                  12nrad / 10nRad                   30 nrad / 40nRad                                     13nrad / 10nRad

Friday                       30 nrad / 10 nRad                30 nrad / 30 nRad                                     50 nrad / 50 nRad  

 

Comments:

- On Monday and Tuesday, ETMX pitch motion was better than the other test masses, even though using the same configuration

- Wednesday results on ETMX show why we need to blend low on Stage 1 Z to reduce the pictch motion (at the cost of amplifying Yaw)

- Thursday results on ETMX with Sensor Correction On are excellent. The angular motion is as low as on the BS that is servoed.

- Friday results on ETMX are not as good in Pitch as the night before, but it is still much lower than usual in Yaw.  The angular motion BS is very high. We might want to disable the op lev servo while testing the sensor correction on this unit. Jim is about to comment on BS sensor coreection activities.

H1 AOS
krishna.venkateswara@LIGO.ORG - posted 08:58, Friday 31 October 2014 (14766)
October 14th Earthquake's effect on BRS

M. Coughlin, K. Venkateswara

Michael noticed the earthquake on October 14th (M7.3 off of Nicaragua) was nicely visible in the seismometers and the BRS. I have attached the timeseries plots. I've also attached ASD plots of about 2 hours of data during the earthquake. GPS time = 1097293900.

The first ASD plot shows the T240X and the BRS RY out signals. Our guess for the horizontal displacement coupling was about 2e-4 rad/m. Multiplying this number with the T240 displacement output gives the red curve in the second plot. This seems to explain the signal in the BRS very well. The plot also shows the approximate estimate of the expected tilt signal assuming

theta ~ (2pi/wavelength) * X  

where wavelength = velocity / frequency (assuming sound velocity of 5 km/s). This gives the light blue curve, which is a factor of ~5 below the displacement coupling in the 50-100 mHz range.

The third plot also shows the residual between the BRS RY out and the displacement coupling which is close to the light blue curve, but without knowing the displacement coupling in an independent measurement, we cannot estimate the tilt component. The fourth plot shows the coherence between the two instruments.

This is a good confirmation of the expected horizontal displacement coupling in the BRS and a measurement of the distance between the COM and the pivot, which appears to be 30 +/-5 micrometers. If |d| had been <3 micrometers, this would have enabled a direct measurement of the tilt component of earthquakes.

Non-image files attached to this report
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 08:23, Friday 31 October 2014 (14765)
CDS model and DAQ restart report, Thursday 30th October 2014

no restarts reported.

H1 AOS
edmond.merilh@LIGO.ORG - posted 16:00, Thursday 30 October 2014 - last comment - 08:22, Friday 31 October 2014(14723)
Daily Ops Summary

08:00 resarted Alarm Handlers; CDS overview: noticed some conflicting counts on fw1 and some timing flags at the mid station; Vacuum: noticed IP-01 flashing red. Sent out emails to the corresponding folks for a check-out.

08:30 ISS loop coming in and out of saturation. Diffracted power all over the place. I bumped the refsignal up a click and the diff power stabilized. I tried a series of clicks following and got the diff power back up to ~7.6%  

09:09 Betsy and Travis out to West bay to work on 3IFO Quad.

09:10 Andres out to W Bay

09:20 Peter F out to LVEA

09:55 J Bartlett, also Andres out of LVEA

10:25 Ryan reported a possible network outage lasting ~10 minutes maybe upstream of PM&L

? Alastair putting power meter on TCS X arm table (WP 4925)

11:12 Robert working in beamtube between mid Y and end Y (shaking tests)

11:21 Dan to end X to look for equipment

11:56 Shivaraj to end X and end Y to mount magnetometers on tripods

12:38 ISS first loop went erratic again until ~

13:19 Karen at end Y

13:51 Karen out of end Y

14:30 Dan H out to HAM6

15:20 Rana brought to my attention folks entering VEA areas. Not everyone is reporting their desire to enter to the operator. Cleaning personell are calling after they've arrived at end stations.

Comments related to this report
edmond.merilh@LIGO.ORG - 08:22, Friday 31 October 2014 (14764)

The ISS loop was sporadic all afternoon

H1 TCS (TCS)
aidan.brooks@LIGO.ORG - posted 13:31, Thursday 30 October 2014 - last comment - 11:10, Friday 31 October 2014(14742)
Required central heating to correct ITMX static lens: 201mW

Based on the TCSX central heating calibration (62.3 micro-diopters single-pass per Watt) and the calculated static lens of -80213m, we require:

+201mW of central heating on ITMX to correct this static lens.

Edited 31-Oct-2014: this isn't correct because of an error in the laser power calibration

Comments related to this report
aidan.brooks@LIGO.ORG - 11:10, Friday 31 October 2014 (14773)

The calibration of defocus vs delivered power is incorrect as the delivered power channel, H1:TCS-ITMX_CO2_LSRPWR_MTR_OUTPUT, was not calibrated correctly.

I went back and reviewed the delivered power for this measurement:

Before thermal lens: H1:TCS-ITMX_CO2_LSRPWR_MTR_INMON = 172.7 counts

During thermal lens H1:TCS-ITMX_CO2_LSRPWR_MTR_INMON = 2113.4 counts

The new gain through the filter banks is 7.2087E-4 Watts per count.

This means 1.399 Watts was applied to ITMX during the thermal lens measurement.

Further analysis of the HWS measurements of the thermal lens show:

  • the (double-passed) change in spherical power was 78.7 micro-diopters after 4.5 hours (close to steady-state).
  • the applied power was 1.399 mW

Therefore, the single-passed ITMX steady-state thermal lens coefficient is 28.1 micro-diopters per Watt

Based on the TCSX central heating calibration and the calculated static lens of -80213m, we require:

+444mW of central heating on ITMX to correct this static lens.

H1 AOS (AOS, SUS)
douglas.cook@LIGO.ORG - posted 16:20, Wednesday 29 October 2014 - last comment - 09:16, Friday 31 October 2014(14711)
optical lever rack/chassis locations and whitening chassis status
Optical Lever Whitening Chassis Rack Locations and Chassis Locations and Current Binary Output Module Status at LHO: D.Cook 10/29/2014
Rack SUS H1-R1: Chassis cabled - Board 1- HAM 2 = No BOM installed
		  Chassis cabled - Board 2- HAM 3 = No BOM installed	
Rack SUS H1-R2: Chassis cabled - Board 1- HAM 2 = No BOM installed
		  Chassis cabled - Board 2- PR3  =  BOM installed
				B1, B2, B4, B9, B10, B12, 17, B18, B20, B25, 26, B28 set HIGH
				(the rest set LOW)
Rack SUS H1-R3: Chassis cabled - Board 1- HAM 5 = No BOM installed
				  Board 2- SR3 = BOM installed
				  B4, B12, B20, B28 set HIGH
 Rack SUS H1-R4: Chassis cabled - Board 1- HAM 4 = No BOM installed
		  Chassis not cabled - Board 2- Empty
Rack SUS H1-R5: Chassis cabled - Board 1- BSC 8 Pier (temp ?) = No BOM installed (jumpered connecter)
		  Chassis cabled - Board 2- BS  =  BOM installed
				B1, B3, B4, B9, B11, B12, 17, B19, B20, B25, 27, B28 set HIGH
				(the rest set LOW)
Rack SUS H1-R6: Chassis cabled - Board 1- ITMx =  BOM installed
				B4, B5, B12, 13, B20, B21, B28, B29 set HIGH
				(the rest set LOW)
   Chassis not cabled - Board 2- Empty
Rack SUS H1-R1 ETMy: Chassis cabled - Board 1- ETMy = BOM installed
				B4, B5, B12, 13, B20, B21, B28, B29 set HIGH
				(the rest set LOW)
		  Chassis not cabled - Board 2- Empty

Rack SUS H1-R1 ETMx: Chassis cabled - Board 1- ETMx = BOM installed
				B2, B3, B5, B10, B11, B13, B18, B19, B21, B26, B27, B29 set HIGH
(the rest set LOW)
Chassis not cabled - Board 2- Empty
Non-image files attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 09:16, Friday 31 October 2014 (14768)
This entry has several bugs making the data incorrect. A corrected status chart can be found in LHO aLOG 14749
Displaying reports 68841-68860 of 83224.Go to page Start 3439 3440 3441 3442 3443 3444 3445 3446 3447 End