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Reports until 13:11, Thursday 16 June 2016
H1 CDS
patrick.thomas@LIGO.ORG - posted 13:11, Thursday 16 June 2016 - last comment - 13:26, Thursday 16 June 2016(27775)
Updated Conlog channel list
Added 184 channels. Removed 8 channels. (see attached)
Non-image files attached to this report
Comments related to this report
david.barker@LIGO.ORG - 13:26, Thursday 16 June 2016 (27776)

I remembered that generating the Guardian autoBurt.req file is very hands-on at the moment and was very much out of date (from early O1)

I re-created the autoBurt.req, which allowed conlog to stop attempting to connect to the removed node and now connects to the new nodes. For the record, we now have 97 Guardian nodes running.

Procedure to update /opt/rtcds/lho/h1/target/h1guardian0/h1guardian0epics/autoBurt.req file:

edit the create_guardian_autoburt.py script to get the node listing correct (I use 'guardctrl list')

save the current autoBurt.req into the archive directory

./create_guardian_autoburt.py > autoBurt.req

Then test with

burtrb -f autoBurt.req

H1 IOO (IOO, SUS)
cheryl.vorvick@LIGO.ORG - posted 13:05, Thursday 16 June 2016 (27773)
noise on IM2 OSEM LR vs noise (or lack of) on IM1 OSEM LR

IM2 shows more motion in pitch and yaw than IM1, IM3, or IM4. Below is a chart showing the p-p amplitude of the oscillations in the damping signals, in urad, for pitch and yaw.

  DAMP_P_IN (urad) DAMP_Y_IN (urad)
IM1 0.5 0.5
IM2 3.0 2.5
IM3 0.7 0.6
IM4 1.0 0.5

Attached is a power spectrum taken today showing OSEM LR, DAMP L, and COIL OUT LR for IM1 and IM2.

See also: alog #26502, alog #25955, alog #25811

Images attached to this report
H1 General (PSL)
edmond.merilh@LIGO.ORG - posted 09:35, Thursday 16 June 2016 - last comment - 16:05, Thursday 16 June 2016(27772)
PSL Weekly 10 Day Trends FAMIS #6100
Images attached to this report
Comments related to this report
jason.oberling@LIGO.ORG - 16:05, Thursday 16 June 2016 (27781)

Everything looks alright except for one slightly worrying trend.  On the Weekly Chiller attachment, the diode and crystal chillers (H1:PSL-OSC_XCHILFLOW and H1:PSL-OSC_DCHILFLOW) both see a slow loss in flow, as does the FE water circuit (H1:PSL-OSC_AMPFLOW) and the HPO power meter water circuit (H1:PSL-OSC_PWRMETERFLOW).  In addition, the flow meter for the laser head 1 water circuit (H1:PSL-OSC_HEAD1FLOW) is also showing a slow drop in flow rate.  As there is no coinciding increase in humidity (found on the Weekly Env attachment) I don't think we have a water leak.  Also, it looks like the Diode chiller flow has leveled off, while the crystal chiller flow does not appear to be doing so.  Combine this with the slow increase seen in the pressure of the crystal chiller water circuit (H1:PSL-OSC_PRESS1 and H1:PSL-OSC_PRESS2, sensors located respectively at the entrance and exit of the HPO water manifold underneath the PSL table), this may be an early indication of a flow issue (for example a small obstruction restricting but not blocking the flow) in the crystal chiller water circuit.  There's no way to know for sure right now, but this is something we are going to keep a very close eye on.

H1 General
edmond.merilh@LIGO.ORG - posted 08:03, Thursday 16 June 2016 (27771)
Shift Summary - Day Transition
TITLE: 06/16 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 7mph Gusts, 3mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.12 μm/s 
QUICK SUMMARY:
Curious, there's a spike in the EQ band up to .1um/sec less than 1 hour before I arrived. Now some more time has passed and there's no sign of anything having happened on USGS.
H1 ISC
stefan.ballmer@LIGO.ORG - posted 03:37, Thursday 16 June 2016 - last comment - 03:37, Thursday 16 June 2016(27769)
SRC ASC work

Evan, Sheila, Stefan

For now we decided that we need to go back to a SRC alignment scheme similar to the O1 one - while not great it kept the machine running with the existing hardware. And we know that was at least reliable enough to do other work.

We started with SRC1_Y. The combination
        ezca['ASC-INMATRIX_Y_6_3']=-1.5   # AS_A36I to SRC1_Y
        ezca['ASC-INMATRIX_Y_6_7']=1      # AS_B36I to SRC1_Y
gave a reasonable error signal with about zero offset, and we could close the loop - with a gain of -30 for now.

As in the past pitch is a bit more tricky. AS_B36I has a nice signal but also quite the offset. We lost lock before finding a good value for this, and had an episode of lock losses most likely due to bad initial alignment. (below).
On the next round the following gains seemed to work for now:

       #set input matrix
        ezca['ASC-INMATRIX_P_6_3']=0 # off for now
        ezca['ASC-INMATRIX_P_6_7']=1 # good enough for now
        ezca['ASC-INMATRIX_Y_6_3']=-1.5
        ezca['ASC-INMATRIX_Y_6_7']=1
        ezca['ASC-INMATRIX_P_6_1']=0
        ezca['ASC-INMATRIX_P_6_5']=0
        ezca['ASC-INMATRIX_Y_6_1']=0
        ezca['ASC-INMATRIX_Y_6_5']=0

 

 

As mentioned, in the meantime we had a number of most likely initial alignment related locklosses. They first occured in the CARM ASC engagement, and later even DRMI phase..

I did a full  initial alignment, and also noticed that the QPD offsets on the red X TR photodiode offset was unreasonably high. I re-zeroed this offset.

 

With that the IFO saw a two Watts, DC readout for 2+h.

Next on the menu was more violin damping. I focused on EX, which currently has 3 moned intermingling; 505.587Hz, 505.707Hz and 505.710Hz.

505.587Hz: Damps with H1:SUS-ETMX_L2_DAMP_MODE1, FM1, FM4, gain=100.

The other two are simply too close to each other (beat signal of 5min!) - we need to damp with the same filter.. I focused on 505.710Hz., which is the big peak.
 I deleted the narrow bandstop filters, and significantly widened the band-pass filter FM1, and tried with

505.710Hz    H1:SUS-ETMX_L2_DAMP_MODE6, FM1, FM4, gain=200.

which seems to work.

The next mode (which actually grew while I paid attention to the other 3) is 507.194Hz, together with 507.159Hz.

507.159Hz seems to damp with H1:SUS-ETMX_L2_DAMP_MODE6 FM1 FM3 FM4, gain=50 (later gain=10). But currently 507.194Hz still bleeds through this filter, which makes it hard to damp.

I left 507.194Hz in H1:SUS-ETMX_L2_DAMP_MODE7 FM1, FM4 gain=50, which seems to provide a wee bit of damping.

After that, ITMY also needs more attention.

 

I leave the interferometer running at 2Watts - I would recommend focusing on getting the violins under control - they prevent other work.

 

 

Comments related to this report
stefan.ballmer@LIGO.ORG - 03:37, Thursday 16 June 2016 (27770)



Also, we noted that the large DC offsets in the AS_B_RF36_I singals can be removed by adding DC pointing offsets - another hint that all this SRC mess is related a centeriong problem.
The offsets were
H1:ASC-DC4_P_OFFSET -0.13
H1:ASC-DC4_Y_OFFSET  0.33

H1 ISC (SUS)
carl.blair@LIGO.ORG - posted 03:09, Thursday 16 June 2016 (27768)
Violin Modes and test mass Bulk modes

The violin mode harmonics overlap with the ~15070Hz test mass bulk modes.  This may explain the mystery modes that have been rung up in the vicinity at Hanford alog27659 15063Hz and Livingston LLO alog20100 15085Hz.
This spectrum was taken from these measurements alog27743.  Two violin mode harmonics are visible between 15kHz to 15.1kHz and 15.5kHz and 15.6kHz.  Several test mass modes are also visible.  The violin modes were elevated and we were actuating on 15077Hz ITMX mode and 15072 ITMY mode (which are very large and far off the top of the plot).
 

Images attached to this report
H1 ISC
sheila.dwyer@LIGO.ORG - posted 00:20, Thursday 16 June 2016 (27767)
attempt at gain matching for AS45

Jenne, Sheila, Peter, Evan, Stefan

We had been using AS45I for SRM signal in the last two days, and they seemed to not work well for yaw today.  Peter and Jenne noticed that the violin modes showed up more strongly in some quadratns of the AS45 WFS than others, so we drove a line in DARM to check the balancing of the AS45 WFS. We drove DARM at 21 Hz, and  looked at the transfer functions to the individual quadrants before the phasing.  We set the gains so that the signal amplitudes would all match quadrant 1.  For AS A, we ended up with gains as different from 0 as 0.69

We then attempted to phase these signals in the same way that the LSC AS45 detector is phased, by turning on and off the DARM offset and making sure that all the DARM signal was in the Q phase.  To do this we changed some phases by up to 20 degrees.  We had to use a step size of 0.5degrees on AS A which is in loop for DHARD to avoid loosing lock.  

After doing this we tried moving the SRM alingment to see if the AS45 signals were better for SRM.  We saw that pit and yaw were cross coupled, and we didn't have much pitch signal at all.  We reverted these changes since we don't really think that the gains in the electronics can be this badly matched.  

Non-image files attached to this report
H1 CAL (CAL)
craig.cahillane@LIGO.ORG - posted 21:20, Wednesday 15 June 2016 - last comment - 23:59, Friday 17 June 2016(27765)
LHO Calibration Uncertainty - Now With Covariance
C. Cahillane

I have revamped the uncertainty budget to include covariances between all stages of actuation and all time-dependent parameters.
I computed each parameter's covariances in real and imaginary coordinates to provide a consistent basis.  I then compiled an 6 x 6 Actuation Covariance Matrix C_A, a 2 x 2 Sensing Covariance Matrix C_S, and an 8 x 8 Kappa Covariance Matrix C_K.  Then I compile them into a giant covariance matrix C:

     _             _
    |  C_A  0   0   |
C = |   0  C_S  0   |
    |_  0   0  C_K _|     

Then, I multiply by some conspicuous Jacobian vectors J(f) to get the final 2 x 2 uncertainty matrix σ_R^2(f):

σ_R^2 = J * C * J'

where J looks like:

        _                            _
       |  d Re(R)    d Im(R)          |
       | ---------  ---------   ....  |
       | d Re(p_i)  d Re(p_i)         |
J(f) = |                              |
       |  d Re(R)    d Im(R)          |
       | ---------  ---------   ....  |
       |_d Im(p_i)  d Im(p_i)        _|

(I was able to use complex differentiation and Cauchy-Riemann here to make the derivatives easier.  Recall that R = 1/C + D*A.  Now I can compute dR/dA = D and dR/dC = -1/C^2 to form J(f), thanks to 200 year old mathematics)

Finally, to make the uncertainties readable by humans, I divide σ_R^2(f) by |R(f)|^2, rotate σ_R^2(f) by angle(R(f)) via a rotation matrix, and read off the square roots of the diagonal of the rotated σ_R^2(f) to get the magnitude and phase uncertainties plotted below.

I have plotted the uncertainty at GPSTime = 1135136350, the time of the Boxing Day Event.

The plot shows an overall increase in magnitude uncertainty of about 1% at low frequency.
Phase uncertainty increased by about 0.5 degrees at low frequency.

The effects are more dramatic at Livingston.  Check out LLO aLOG 26542.  
Images attached to this report
Comments related to this report
craig.cahillane@LIGO.ORG - 12:33, Thursday 16 June 2016 (27774)CAL
C. Cahillane

I have reproduced the uncertainties including covariance for GW150914 for the calibration companion paper.  We will have to update the associated uncertainty calculation sections of the paper.  
I have also attached two .txt files for the R_C01/R_C03 response comparison and the associated uncertainty.

Something I failed to emphasize above: Our uncertainties in the response function are now fully covariant... the plots I show of the magnitude and phase are only approximations to the true uncertainty.  
I have looked at the 3D plots of the covariant ellipses, and it's a fairly good approximation in this case. 
Images attached to this comment
Non-image files attached to this comment
craig.cahillane@LIGO.ORG - 23:59, Friday 17 June 2016 (27829)CAL
C. Cahillane

I have attached and printed my relative covariance matrix.  Please see DCC T1600227 for an explanation of the relative covariance matrix.  
Basically, the below is percentage covariances.
 

             Re(A_U)   Im(A_U)   Re(A_P)   Im(A_P)   Re(A_T)   Im(A_U)   Re(C_R)   Im(C_R)   Re(K_T)   Im(K_T)   Re(K_P)   Im(K_P)   Re(K_C)   Im(K_C)   Re(f_C)   Im(f_C)
Re(A_U)       0.0166    0.0083    0.0139    0.0079    0.0146    0.0067         0         0         0         0         0         0         0         0         0         0
Im(A_U)       0.0083    0.0209    0.0091    0.0169    0.0071    0.0178         0         0         0         0         0         0         0         0         0         0
Re(A_P)       0.0139    0.0091    0.0163    0.0052    0.0157    0.0066         0         0         0         0         0         0         0         0         0         0
Im(A_P)       0.0079    0.0169    0.0052    0.0181    0.0057    0.0156         0         0         0         0         0         0         0         0         0         0
Re(A_T)       0.0146    0.0071    0.0157    0.0057    0.0251    0.0047         0         0         0         0         0         0         0         0         0         0
Im(A_T)       0.0067    0.0178    0.0066    0.0156    0.0047    0.0187         0         0         0         0         0         0         0         0         0         0
Re(C_R)            0         0         0         0         0         0    0.0207    0.0079         0         0         0         0         0         0         0         0
Im(C_R)            0         0         0         0         0         0    0.0079    0.0208         0         0         0         0         0         0         0         0
Re(K_T)            0         0         0         0         0         0         0         0    0.0025   -0.0002    0.0019   -0.0018   -0.0004         0    0.0004         0
Im(K_T)            0         0         0         0         0         0         0         0   -0.0002    0.0025    0.0017    0.0019    0.0001         0    0.0001         0
Re(K_P)            0         0         0         0         0         0         0         0    0.0019    0.0017    0.0035   -0.0003    0.0002         0   -0.0003         0
Im(K_P)            0         0         0         0         0         0         0         0   -0.0018    0.0019   -0.0003    0.0035    0.0006         0   -0.0005         0
Re(K_C)            0         0         0         0         0         0         0         0   -0.0004    0.0001    0.0002    0.0006    0.0037         0   -0.0036         0
Im(K_C)            0         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0
Re(f_C)            0         0         0         0         0         0         0         0    0.0004    0.0001   -0.0003   -0.0005   -0.0036         0    0.0054         0
Im(f_C)            0         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0

H1 ISC
terra.hardwick@LIGO.ORG - posted 20:55, Wednesday 15 June 2016 - last comment - 22:13, Friday 17 June 2016(27752)
ITM charge measurements, alpha calculation

Jenne, Peter, Jeff, Terra

We took charge measurements on the ITMs by driving 20.1 Hz into H1:SUS-ITMX/Y_L3_DRIVEALIGN_L2L_EXC with 100k cts and looked at the coupling to DARM. We stepped up and down the ESD bias voltage from zero and found the bias that gave zero coupling to get charge measurements, where Vcharge= (20/218) * bias * 40. ITMX zeroed with bias = 3k, ITMY zeroed with bias = 2.5k. See bias stepping ITMX and ITMY spectra attached. 

ITMX charge: 9.15 V,   ITMY charge: 7.6 V

ITMX: 

BIAS offset  RMS AMPL (m) PEAK AMPL (m)  PHASE (deg)
0 4.9x10-15 6.9x10-15 37
50K 7.6x10-14 1.1x10-13 -142
100K 1.6x10-13 2.6x10-13 -142
-50K 8.5x10-14 1.2x10-13 38
-100K 1.7x10-13 2.4x10-13 38

ITMY:

BIAS offset RMS AMPL (m) PEAK AMPL (m) PHASE (deg)
0 5.4x 10-15 7.6x10-15 -142
50K 9.3x 10-14 1.3x10-13 38
100K 1.9 x 10-13 2.7x10-13 38
-50K 1.0 x 10-13 1.4x10-13 -142
-100K 2.0x 10-13 2.8x10-13 -142

 

Approximating alpha: The first term in the expression for the force produced by the ESDs is the attractive force between the ESD fringe fields and the test mass: F = alpha(Vbias - Vsignal)2, where alpha is a constant of proportionality. With the known bias voltage Vb, signal drive voltage Vs, drive frequency f, and now the peak amplitude xpp , we used the largest bias offset (100k) to approximate alpha for both ITMs. Work is attached

ITMX: alpha = 1.78 x 10-11 N/V2,   ITMY: alpha = 1.85 x 10-11 N/V2

Images attached to this report
Comments related to this report
terra.hardwick@LIGO.ORG - 22:13, Friday 17 June 2016 (27825)

These LHO ITM force coefficients agree with LLO's. Using Valera and Den's 2015 measurements (and assuming an 80 Hz ESD drive), I calculated alpha for LLO ITMX: alpha = 1.46 x 10-11 N/V2

H1 SUS (ISC)
nutsinee.kijbunchoo@LIGO.ORG - posted 19:52, Wednesday 15 June 2016 - last comment - 23:41, Wednesday 15 June 2016(27763)
Violin mode damping work update

Stefan, Nutsinee

So we found out that the ITMY vstop filter has been turned off. That's likely the cause of mysterious ring up of ITMY violin modes last night and tonight. I was able to damp the three highest modes (ITMY MODE2, MODE3, MODE5) with the settings on the table I confirmed on June 13. I haven't had a chance to re-comfirm all the settings. So until then I would either comment out IY violin mode damping guardian lines or just skip it for now.

 

Images attached to this report
Comments related to this report
nutsinee.kijbunchoo@LIGO.ORG - 20:04, Wednesday 15 June 2016 (27764)

Nevermind. I commented out every IY line except for MODE2, 3, and 5.

sheila.dwyer@LIGO.ORG - 23:41, Wednesday 15 June 2016 (27766)

Evan, Sheila

We tried the settings in the guardian (and in the new wiki) for ITMY mode 1 and mode 6, they worked so they are back in the guardian now.  ETMX mode7 (507.195Hz) is the largest violin mode now, and I don't see settings for this mode on the wiki, so I tried FM1, FM4, and a +30 gain (BP, 100dB, 0 degrees of phase).  This seemed to ring it up very slowly, so if we hadn't lost lock for unrelated reasons I would have tried a 60 degrees phase shift.  

LHO General
corey.gray@LIGO.ORG - posted 15:58, Wednesday 15 June 2016 (27750)
DAY Ops Summary

Wanted to get H1 to atleast DRMI before today's Press Conference, so jumped into locking first thing this morning, but no DRMI locks, and PRMI would not stay lock for more than a second, so opted for an Initial Alignment, but it wasn't trivial.  A few notes from locking & alignment:

  1. Noticed an unlabeled Red Box on the OPS Overview at EY (PVinfo showed me it was the BIO for ETMy).  Ed showed me what this comes from (on the ETMy SUS screen's L2 stage all the way on the right, an LR box was RED for the BIO MON.  So, for the "RMS WD RESET", I changed the 1.0 to 0.0 and then back again to 1.0.  This cleared it up.
  2. During the alignment, the IMC had issues:  1) Wasn't locking, 2) AOM Diffracted Power was a bit high over 12% (later found out this was ok), & 3) Cheryl noticed IO WFS YAW & PIT outmons were high.  For the latter, Cheryl hit "CH" for the YAW DOF filter banks (& also PIT).
    1. At this point, she noticed the PZTs were off, so she watched the MC2 Trans & video of MC REFL and walked the PZTs until she got the IMC locking.  This eventually brought back IMC locking
  3. On PRM_ALIGN, the ASC signals never converged after a few minutes, so went DOWN & back to PRM_ALIGN & it was fine.
  4. Also had issue with SRC_ALIGN, as noted yesterday, where once SRC_ALIGN_OFFLOADED looks to be complete, Guardian ramps the PSL down normally, but lately, it's been ramping it back up!  (anyway, took ALIGN_IFO node to DOWN & called it good).

Another IFO Note:  After the alignment, Krishna mentioned conditions were quiet so, we took the ITMs to the 90 blends and NO Sensor Correction.

BSC ISI Guardian Note:

Krishna noticed that Sensor Correction was turned off for ETMy & ETMx ISI's at around 1am last night by taking a gain from 1 to 0 by hand.  We want to get in the habit of not doing this (because Guardian does not monitor these gain channels -at the moment-), and use our fancy new Guardian medm (sitemap/O-1/ISI Blend Filters.adl)

Daily activity log attached as pdf.

Non-image files attached to this report
H1 PSL (PSL)
cheryl.vorvick@LIGO.ORG - posted 15:55, Wednesday 15 June 2016 (27760)
Weekly PSL Chiller Reservoir Top-Off

I checked the PSL chillers, per FAMIS work order 4155, assigned to me today, and found the chiller was filled yesterday, so did not need any water.

H1 FMP
bubba.gateley@LIGO.ORG - posted 15:46, Wednesday 15 June 2016 (27759)
E X Wind Fence
First post is in the ground and concrete is curing.
Images attached to this report
H1 ISC
terra.hardwick@LIGO.ORG - posted 03:11, Wednesday 15 June 2016 - last comment - 17:01, Wednesday 15 June 2016(27743)
PI ITMY actuation adventures

Carl, Terra, Rich A.

1. We used the never-before-tested LVLN ITMY ESD driver to ring up and damp two mechanical modes of ITMY, 15072 Hz and 14979 Hz. Below is the amplitude evolution of the 15072 Hz peak as we rang it up, allowed it to ring down naturally, rang it up again, and then damped it down fully with a gain sign flip. 

We drove and damped similarly for the 14979 Hz peak. 15072 Hz is the vertical differential drumhead mechanical mode; 14979 Hz is the horizontal version. For both cases, we tightly bandpassed the H1:OMC-PI_DCPD_64KZ_A/B signal, added a +60deg damping filter, and added gain to the damping filter until saturation. Positive gain drove up, negative damped down. 

I've fit the natural ring down with f(x) = a * exp(bx), where tau = - (1/b). Then Q = pi * 15072 * tau = 31.5 million.

2. Interestingly, we realized after the above tests that we had not turned the ESD bias on for either ITM. After turning on both to 100K cts (to DC offset), we just had time to ring back up the ITMY 15072 Hz mode before a lockloss. Below is a comparison of the ring ups (note we lost lock and did not damp for the ring down portion below). Green trace is the 15072 Hz ring up without bias, blue trace is with bias (time shifted for ease of comparison).  

A slight slope difference is visible but we'll look into this more. Thoughts are that we could use the difference in responses to measure test mass charge coefficients as discussed here and here.

3. We turned ring heaters off and on for future mode-mass identification analysis. For the record (since RH messing with violin modes was a concern tonight):

Images attached to this report
Comments related to this report
carl.blair@LIGO.ORG - 13:59, Wednesday 15 June 2016 (27753)

We were also driving the ITMX mode at 15077Hz before and after the bias was turned on.  The data is a little more confusing.  As the phase was being varied before hand to try find the optimum damping phase.  In the plot the amplitude is made to coincide when the damping phase with no bias had the largest response.  There was no attempt to optimise the phase in the case where the bias was on other that to try the positive and negative of the previous 'best' phase.   Interesting points are: 
For the 15077Hz mode the phase that excited the mode was flipped whent he bias was engaged.  
The response with the bias engaged is relatively larger when compared to the ITMY 15072Hz mode.  
For the 15077Hz mode the amplitude response with bias is about twice the amplitude response without bias.

Images attached to this comment
carl.blair@LIGO.ORG - 17:01, Wednesday 15 June 2016 (27762)

Mode identification.  
In the attached plot the relative change in frequency of the four likely drum head modes around 15200Hz is plotted as a function of time.  The ring heaters were adjusted as follows:

ETMX 0.5W per segment to 0W  02:29
ETMY 0.5W per segment to 0W  03:00
ITMX  0W to 0.5W per segment  03:33
ITMX  0.5W per segment to 0W  04:02
ITMY  0W to 0.5W per segment  04:06
ITMY  0.5W per segment to 0W  04:36

The response in frequency shows that the 15218Hz mode is a cooling ETMX, 15219Hz is a cooling ETMY, 15197Hz a heating ITMX and 15192 a heating ITMY mode.  
As we were only operating at 2W input the signal to noise ratio of modes is a lot lower and many fewer modes are visible compared to Livingston measurements T1600141.



The following is the list of modes identified.

Measured Frequencies   Simulated Frequency        
ITMX ITMY ETMX ETMY ITMX ITMY ETMX ETMY Shape description
6044 6042 6055 6054 6057 6054 6053 6053 Butterfly  
8162 8160 8161 8158 8194 8190 8189 8188 Drumhead  
9812 9809 9829 9831 9827 9827 9832 9832 Drumhead Vertical
9860 9863 9881 9882 9879 9881 9885 9885 Drumhead Horizontal
  10415     10437 10434 10433 10432 3 point ripple  
10423 10419 10428 10426 10462 10460 10463 10462 Drumhead  
12992 12988 12999 13000 13022 13026 13035 13036 Drumhead Differential
15077 15072     15093 15096 15102 15103 Drumhead Horizontal
15197 15192 15218 15219 15227 15227 15232 15231 Drumhead  
    15540   15545 15541 15544 15544 Drumhead Vertical
  15627     15635 15632 15634 15634 Drumhead Horizontal
19555 19553     19589 19588 19595 19594 Drumhead  
Images attached to this comment
LHO VE
kyle.ryan@LIGO.ORG - posted 21:43, Tuesday 14 June 2016 - last comment - 16:11, Wednesday 15 June 2016(27741)
CP5 LLCV %open seems high


			
			
Comments related to this report
chandra.romel@LIGO.ORG - 16:11, Wednesday 15 June 2016 (27761)
Chandra, Gerardo

-Adjusted CP5 Dewar pressure regulator 1/4 turn CW to raise Dewar pressure (nominally at 15 psi). Will wait hours/days to see results. 
-Measured Dewar vacuum jacket pressure = 20 microns, satisfactory.
-Magnehelic readout is noisy - jumps from 35-40 in. of H20, even when CP5 is in manual mode.
-Manually tested full range of stroke of electronic actuator - looks OK.
-Tightened actuator support/brace nuts along unistrut.
-Noticed needle of valve has wiggle (more than CP6). Verified packing nut is adjusted properly and coupling nut and needle are fully threaded.

So now we wait to see if adjusting pressure of Dewar has an impact.
kyle.ryan@LIGO.ORG - 21:58, Tuesday 14 June 2016 (27742)
Not able to trend - was sitting around 100% but maybe just big swing?
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