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Reports until 11:00, Thursday 17 April 2014
H1 AOS (AOS, SUS)
thomas.vo@LIGO.ORG - posted 11:00, Thursday 17 April 2014 (11405)
ETMX OptLev Gain Settings
With a small break in commissioning, I thought it would be a good time to try to optimize the ETMX optical lever since we're really close to hitting the noise floor at low frequency (f<2Hz). Previously, we had two levels of 1:10 whitening in analog land and it was good enough for a while until we fully commissioned the ISI.  With TBetter blend settings, the suspension resonances seen in the low frequency regime are getting closer and closer to not being visible at all, which will be a problem if we want to use the optical lever for active damping.

This is the premise for changing the gain settings in order to amplify the suspension mode signals at low frequency using the whitening chassis gains we also wanted to add more laser power to match the other optical levers on site and at LLO:

Old:
2 levels of 1:10 whitening
9,000 counts on the QPD

New:
1 level of 1:10 whitening
1 level of 1.414 gain
1 level of 2.0 gain
15,000 counts on the QPD


We've also had their respective anti-whitening and anti-gain stages in software in:
H1:SUS-ETMX_L3_OPLEV_SEG1_Name2
H1:SUS-ETMX_L3_OPLEV_SEG2_Name2
H1:SUS-ETMX_L3_OPLEV_SEG3_Name2
H1:SUS-ETMX_L3_OPLEV_SEG4_Name2

I've attached the pitch, yaw, and the counts on each individual segments to show if the gain switching is working.  The REFs are the old configuration.  You can see that it really doesn't help the situation at all when it comes to the low frequency stuff which means we might have to be more clever on how to make the optical levers more useful in the future.  In fact, one could argue that Yaw got worse, but it's hard to compare since the data sets differ by about 12 hours in time.  Jeff Kissel suggested looking at the laser intensity noise as well as the electronics chain to see if that could be a limiting factor in our spectra, this means that the adding extra laser power could be the cause of the increase in noise floor.
Non-image files attached to this report
H1 CDS
cyrus.reed@LIGO.ORG - posted 09:09, Thursday 17 April 2014 (11404)
Driver Updates on opsws4,7

I have changed the X11 driver on opsws4 and 7 to use the proprietary AMD version; this matches the configuration of the other workstations.  These were originally kept on the open source driver due to problems using RDP with the other driver, at the expense of MEDM running slow - switching to rdesktop instead of remmina for RDP seems to have fixed this.

H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 08:31, Thursday 17 April 2014 (11403)
CDS model and DAQ restart report, Wednesday 16th April 2014

model restarts logged for Wed 16/Apr/2014
2014_04_16 03:22 h1fw1
2014_04_16 05:30 h1fw1
2014_04_16 06:08 h1fw1
2014_04_16 06:26 h1fw1
2014_04_16 09:16 h1fw1
2014_04_16 11:22 h1fw1
2014_04_16 18:23 h1fw1
2014_04_16 21:18 h1fw1
2014_04_16 23:13 h1fw1
2014_04_16 23:25 h1fw1

all restarts of h1fw1 are unexpected. We might try a reboot of the solaris QFS server h1ldasgateway1 today if this persists.

h1nds1 (the default NDS) reads frames written by h1fw1. This will show data gaps when h1fw1 restarts. If this poses a problem, the user has the option to switch to h1nds0 which has continguous data.

H1 ISC
keita.kawabe@LIGO.ORG - posted 18:42, Wednesday 16 April 2014 (11402)
ISCTEY today

Green beam was almost clipping on PZT1 mirror and 1" fixed steering mirror downstream. This is because the path was set up before the arm was open. Now that we know a good angle of TMS, I changed the table path such that the beam was safely inside the mirror.

Restarted WFS path work but one problem is that the waist of the beam rejected by FI was much smaller than Bram's design (measured [91, 77]um P and Y, should be about 200-250um for the design to work).

The beam size injected into the chamber was [P,Y]=[2.09, 2.72]mm radius,  measured at around the splitter for Hartman (should be about 2.2 or so). The return beam size was matched to injection only in PIT ([P, Y]=[2.0, 1.7]). 

I adjusted the lens position (between PZT1 and PZT2) to split the error. Injeciton [P,Y]=[2.10, 2.66], return =[2.4, 2.1].

This made the waist of the FI-rejected beam larger (about 100um) but not enough. I'll see if I have a space to move things around to make it work.

H1 SEI (SEI)
hugo.paris@LIGO.ORG - posted 17:55, Wednesday 16 April 2014 - last comment - 18:05, Wednesday 16 April 2014(11400)
ETMX Blend Filters - TCrappy VS. TBetter

JeffK, SheilaD, HugoP

We currently have 2 sets of optimized BSC-ISI blend filters that we are trying to choose from: TCrappy and TBetter. 

We produced the plots for these filters as installed on ETMX* in order to asses their strengths and weaknesses. Plots are attached:

TBetter filters feature more inertial sensor signal in the blend, at low frequency, on the rotational degrees of freedom.

TBetter blends allows getting more performance ~0.5Hz, and the trade off is more low frequency motion amplification (see upcoming plots from Sheila).

 

*: TBetter was loaded into TCrappy, and it was unclear which filters loaded in TBetter due to file shadowing in the folder tree. This was fixed on ETMX, and we now load the TBetter blend filters from the common part of the SEI svn:
/ligo/svncommon/SeiSVN/seismic/BSC-ISI/Common/Complementary_Filters_BSC_ISI/aLIGO/some_modified_bend_crappy_filters_040914.mat

Non-image files attached to this report
Comments related to this report
sheila.dwyer@LIGO.ORG - 18:05, Wednesday 16 April 2014 (11401)

Here are spectra of the OpLevs for ETMX.  For all of these plots there is no sensor correction.  

THe first plot is saved as sheila.dwyer/ALS/HIFOX/ISIs/ETMX_APril16.xml, this template also has the data for ISI and ground sensors.  The references (dashed lines) are with Tcrappy on, the solid lines are Tbetter.  As expected, Tbetter is better for pitch at half a Hz, but adds large yaw at low frequencies. 

Next I tried Tbetter for every DOF excpet moved Rz to Tcrappy on both stage 1 +2.  This gets us the benfit in ptich, without the low frequency yaw penalty. In the second plot the dashed lines are Tcrappy again, the solid lines are Tbetter on all DOFs expcept for RZ.  This first plot is saved as sheila.dwyer/ALS/HIFOX/ISIs/ETMX_APril16_TcrappyRZ.xml

Images attached to this comment
H1 SUS
arnaud.pele@LIGO.ORG - posted 17:47, Wednesday 16 April 2014 - last comment - 15:25, Thursday 15 May 2014(11399)
ETMY measurements for filter design

This afternoon, after Jeff balanced the coils, I took measurements on the main chain of ETMY for filter design.
Results attached are showing Length/Pitch/Yaw drive to Pitch/Yaw Response for the top mass, UIM and PUM. Y axis is in urad/cts

Templates live in the usual sus path H1/ETMY/SAGL1/Data/2014-04-16_H1SUSETMY_P2PY_WhiteNoise.xml
 

Non-image files attached to this report
Comments related to this report
arnaud.pele@LIGO.ORG - 15:25, Thursday 15 May 2014 (11919)

Corrected version (without mistakes !)

Non-image files attached to this comment
H1 ISC
stefan.ballmer@LIGO.ORG - posted 17:40, Wednesday 16 April 2014 (11398)
h1iscex control state definition running
But the xml file still needs updates.
H1 CDS (SEI, SUS)
david.barker@LIGO.ORG - posted 17:39, Wednesday 16 April 2014 (11397)
bringing IOP SUS Watchdogs Alarms up to date and simplifying them

I simplified the IOP software sus watchdog alarms, only alarming on the DACKILL status. I added all missing SUS and SEI systems (the current system was essentially the Y-arm one-arm-test version). I found some IOP safe.snap files had incorrect alarm levels, which I fixed and updated all safe.snap files as some were RCG2.7 versions.

I added guidance text to the alarms.

IOP Watchdog alarms should now be valid and acted on if raised.

LHO General
patrick.thomas@LIGO.ORG - posted 17:28, Wednesday 16 April 2014 (11379)
Ops Summary
08:50 David H. working around TCSY
08:56 Thomas V. working on ETMY optical lever
09:06 Hugh R. working on HAM5 HEPI
09:23 Jodi F. inventorying 3rd IFO baffle parts in LVEA west bay
09:23 Greg G. to crane dewers over X arm (WP 4570)
09:55 Mark B. to LVEA to take pictures of SRM and SR3
10:02 Travis S. to LVEA to take pictures of clean room HEPI interference in beer garden
10:24 Richard M. to end X to work on restoring weather station
12:15 David H. breaking for lunch
12:58 Karen to clean at mid Y
13:28 Jeff B. and Andres to LVEA test stand area to look for parts
13:45 Jeff B. and Andres done
14:01 Karen done
14:49 Thomas V. working on optical levers at end X
15:08 Arnaud P. starting measurements on ETMY
15:44 Thomas V. back from end X
16:27 David H. done work on TCSY

mid X weather station started
tour in the control room
dust monitor at end X resumed communication, possible side affect of work to restore weather station
LHO VE
kyle.ryan@LIGO.ORG - posted 17:21, Wednesday 16 April 2014 (11396)
"Full Try-cock" line clogged at CP5 LN2 dewar
Praxair drivers had noted this on previous occasions -> I installed a 3/8-1/4 tube adapter to the line and briefly applied 40psi of helium (only because it was "handy") and cleared the line out -> seems to be working fine now
H1 AOS (TCS)
david.hosken@LIGO.ORG - posted 17:08, Wednesday 16 April 2014 (11395)
TCS Signet 2537 paddlewheel flow sensor settings
DavidH/Greg

The calibration factors for the TCSX and TCSY paddlewheel flow sensors were adjusted so that their digital displays matched the measured flow rates for the in-line flow meters. Each chiller operated at ~60psi, while a flow rate of ~3.5GPM was displayed.

Initially a K-factor value of 335.000 was used, given the molded Tee fitting that houses the sensor. This resulted in the digital display to read high.
 
The flow sensor settings can be changed by using the menu function on the sensor itself. The following settings are now being used, and are the same both TCSX AND TCSY.

Model 2537 4 to 20mA Output
Flow Unit = Gallons per min (G/m)
K-Factor (PULSES per VOLUME UNIT) = 385.000
Average = 0 seconds(Default factory setting)
Sensitivity = 0 (Default factory setting)
4 Set (Set flow RATE to be represented by 4 mA) = 0.0000
20 Set (Set flow RATE to be represented by 20 mA) = 10.000
Contrast (Adjust visibility of liquid crystal display) = 3

Sample displays for the paddlewheel sensor/inline flow meter after this adjustment to the K-factor are attached.  
Images attached to this report
H1 SEI
stefan.ballmer@LIGO.ORG - posted 16:53, Wednesday 16 April 2014 (11394)
ETMX ISI tripped
While switching blends back to TCrappy

It continues to trip as I am trying to bring it back, basically as soon as I reset the watchdog it trips again.  

this is sheila

Images attached to this report
H1 SEI
hugo.paris@LIGO.ORG - posted 16:03, Wednesday 16 April 2014 - last comment - 14:37, Friday 18 April 2014(11391)
BSC-ETMY - Performance

JimW and I worked on getting the performance of BSC-EY comparable to the performance of BSC-EX, before handing off to SUS.

BSC-EY now has the following control tools installed:

We compared the performance of BSC-EY with the performance of BSC-EX, with both platforms under BSC-EX's most used configuration:

Attached Plots show comparable performance of the ISIs, at the projected suspension point, for similar ground motion at both end stations. (plots calibrated in nm and nrad).

One can notice a 10Hz peak, on BSC-EY spectra. We went ahead and took performance spectra at EY with the Isolation off. The peak is also there when the isolation and damping loops are off. Hence, the peak seen at 10Hz is neither caused, nor amplified, by the ISI active controls.

Since SUS provides plenty of isolation at 10Hz, we decided to give them the go ahead to start their testing.

 

 

Meanwhile, JimW and I kept investigating. We noticed that HEPI L4Cs were seeing the 10Hz peak too, and that it is mostly seen on the vertical L4Cs (see Page 1 of last attachment). We were able to reduce this peak's amplitude by a factor of ~10 by simply turning HEPI position loops off (see Page 2 of last attachment). It looks like HEPI-EY position loops are somehow amplifying the 10Hz peak, but they are not its source, as the peak still appears clearly with HEPI off.

Non-image files attached to this report
Comments related to this report
hugo.paris@LIGO.ORG - 14:37, Friday 18 April 2014 (11442)

I previously wrote that the ~10Hz peak was mostly seen on the vertical L4Cs, while it is actually seen on the Horizontal L4Cs.

H1 SUS (AOS, ISC, SYS)
jeffrey.kissel@LIGO.ORG - posted 15:26, Wednesday 16 April 2014 - last comment - 15:47, Wednesday 16 April 2014(11392)
H1 SUS ETMY UIM & PUM Coils Balanced
J. Kissel

Thanks to Thomas' incremental improvements to the H1 SUS ETMY optical lever (see LHO aLOGs 11356 & 11387), he got the noise low enough that we were comfortable pushing forward with the large suite of measurements needed to get the QUAD ready for ISC use. the first on this list is the coil balancing on the middle two stages, which has now been completed (following instructions in LHO aLOGs 9453, 9079 and parameters taken from LHO aLOG 10493) with the results below.

The final balanced gains are

H1 SUS ETMY
Channel     Balanced COILOUTF Gain
L1 UL            -0.957
L1 LL            +1.021
L1 UR            +0.976
L1 LR            -1.042

L2 UL            +0.964
L2 LL            -1.039
L2 UR            -0.959
L2 LR            +1.034

The SNR was particular good this time around (thanks to TBetter instead of TCrappy filters on the ISI? [Less wind/ better ground motion]), so I was able to determine these values to 0.25% (instead of the usual 0.5%). The first page of each attachment shows the ASDs of the optical lever signals during a pringle drive at each respective stage, before and after balancing. The second page compares the coherence between blanaced and unbalanced. In summary,

   DOF                  Reduction Factor @ 4.1 [Hz]
L1 Pringle to L3 P           > 9.4               (peak is in the noise, and only ~70% coherent)
L1 Pringle to L3 Y             38 

L2 Pringle to L3 P           > 1.8               (peak is in the noise, totally incoherent)
L2 Pringle to L3 Y             33

Now we begin measuring L P Y of each stage to P&Y of the test mass, to gather all data necessary for 
- iStage L to test mass P&Y for frequency dependent length to angle decoupling, 
- iStage P to test mass Y & iStage Y to test mass P for frequency dependent alignment decoupling, and 
- iStage P to test mass P & iStage Y to test mass Y for alignment plant compensation.
Non-image files attached to this report
Comments related to this report
jeffrey.kissel@LIGO.ORG - 15:47, Wednesday 16 April 2014 (11393)
Measurement Details
-------------------

Coil Driver Configuration:
       BIO State    Compensation
UIM        1             ON
PUM       -2            OFF

Demodulator filters used:
SIG band pass: BP4.0Hz = butter("BandPass",2,3.5,4.0)
DEMOD I & Q low-pass: CLP50mHz = cheby1("LowPass",2,3,0.05)

Demodulator Drive Parameters (for both measurements)
   Freq [Hz]     Amp [ct]     Sin [ct]    Cos [ct]
P   4.0          115000         10000     10000
Y   4.0          115000         10000     10000

SEI Configuration (for both measurements):
HPI: Level 1 Isolation, "Pos" position sensor only blend filters
ST1: Level 3 Isolation, "TBetter" blend filters (in all DOFs)
ST2: Level 3 Isolation, "TBetter" blend filters (in all DOFs)

Measured using a 200 second average (shorter than yesterday) of the demodulated signals, i.e.
tdsavg 200 H1:SUS-ETMX_LKIN_P_DEMOD_I_OUT H1:SUS-ETMX_LKIN_P_DEMOD_Q_OUT H1:SUS-ETMX_LKIN_Y_DEMOD_I_OUT H1:SUS-ETMX_LKIN_Y_DEMOD_Q_OUT

H1 ETMX L1
     Demod Phase [deg]          Unbalanced Value [ct]    Balanced Value [ct]
P       77            I         +1.311 pm ~0.2           -0.017 pm ~0.2
                      Q         -0.157 pm ~0.2           -0.132 pm ~0.2
Y       78            I         -9.510 pm ~0.2           -0.063 pm ~0.2
                      Q         -0.243 pm ~0.2           -0.236 pm ~0.2

H1 ETMX L2
     Demod Phase [deg]          Unbalanced Value [ct]    Balanced Value [ct]
P       -33.5         I         -0.243 pm ~0.5           -0.044 pm ~0.5
                      Q         -0.060 pm ~0.5           -0.003 pm ~0.5
Y       -33.5         I         -3.874 pm ~0.5           -0.041 pm ~0.5
                      Q          0.267 pm ~0.5           -0.121 pm ~0.5
note that the quote pm values are the by-eye, peak-to-peak amplitude of the demodulated signal which oscillates with a ~25 sec period. I quote values to a much higher precision because I'm averaging over 200 seconds.

To perturb the PIT or YAW balancing by 5%, 1%, 0.5%, and then by 0.25%:
/ligo/svncommon/SusSVN/sus/trunk/Common/PythonTools/perturbcoilbalance_fourosem.py H1 ETMX L1 [PIT/YAW] [0.05/0.01/0.005/0.0025]
/ligo/svncommon/SusSVN/sus/trunk/Common/PythonTools/perturbcoilbalance_fourosem.py H1 ETMX L2 [PIT/YAW] [0.05/0.01/0.005/0.0025]

Exact balanced values:
Measured using a simple command line caget, i.e.
caget H1:SUS-ETMX_L2_COILOUTF_UL_GAIN H1:SUS-ETMX_L2_COILOUTF_LL_GAIN H1:SUS-ETMX_L2_COILOUTF_UR_GAIN H1:SUS-ETMX_L2_COILOUTF_LR_GAIN

H1 ETMX L1
 Coil     COILOUTF Gain
UL         -0.957006
LL         +1.02136
UR         +0.976339
LR         -1.04199

H1 ETMX L2
 Coil     COILOUTF Gain
UL         -0.964279
LL         +1.03047
UR         +0.95947
LR         -1.03428
Of course, these values are set at arbitrary precession, they're rounded to the values quoted in the main entry (a) because the measurement uncertainty is no better than 0.25%, and (b) the MEDM screen does not display out to higher precession, so further precision would not be visible.
H1 PSL
sheila.dwyer@LIGO.ORG - posted 14:13, Wednesday 16 April 2014 (11390)
PSL back to science mode


			
			
H1 SEI (INS)
hugh.radkins@LIGO.ORG - posted 13:44, Wednesday 16 April 2014 (11389)
WHAM5 SEI HEPI Activities/Status--6 Actuators Attached, 2 to go

Scott & I got the last Horizontal L4C leveled and then a few more Actuators attached.  Should complete this initial install tomorrow morning.  IAS in the afternoon.  I say initial because commissioning may find some details that need addressing.

H1 ISC
sheila.dwyer@LIGO.ORG - posted 12:33, Wednesday 16 April 2014 (11381)
X arm transmission increased

Since the Faraday swap on monday, we have more green power. 

On the table we measured 50mW going towards the chamber, where previously we had measured 47mW (6% increase).  On QPD A we had a 10% increase in the sum, on QPD B a 30% increase in the sum.

Alexa and I measured 19uW arriving on ISCT1, compared to 12 uW measured in alog 9191 ( 60% increase from January)

We also noticed that the beam quality was better than it had been.  We measured some profiles, it is a guassian beam, they will be attached to this post later.

When the arm is locked we see a 35% increase in the transmitted power measured by the COMM BBPD, compared to last week. 

Non-image files attached to this report
H1 ISC
daniel.sigg@LIGO.ORG - posted 11:49, Wednesday 16 April 2014 (11385)
VCO Phase Noise

We measured the phase noise of the low noise VCO. We used the COMM PLL which deploys a single stage frequency-difference divider (FDD). The PLL was locked to a fixed frequency oscillator (ifr locked to GPS running at 78.95 MHz). The output filters of the PLL were: boost engaged, generic disabled, VCO comp off and low pass off. We added a SR560 with 3 kHz low pass and a gain of 10 to clean up the high frequency part. We then looked at the error point of the common mode board (H1:LSC-REFL_SERVO_ERROR). The calibration is as follows:

25kHz/V (VCO sensitivity) / 25 (boost gain) * 5 (gain divider in VCO output path) / 10 (SR560 gain) / 100 (gain in ERROR readback) * 1V/3200cts = 0.0016 V/cts

For the SSB (single-sided sidebands) we divided by an other sqrt(2). This plot matches nicely to the high frequency SSB curve measured in T0900451. Above 100 Hz we see some excess phase noise which is most likely due to the ifr. The two curves together characterize the low noise VCO all the way from 1 mHz up to 100 kHz. To get the phase noise of the VCO without the FDD we can just multiply the attached curve by 10.

The rms frequency noise of the VCO was previously measured in alogs 6972 and 6865. The numbers were 2 Hz rms for a VCO with FDD and 16 Hz for a VCO without. This is in good agreement with the current measurement.

Non-image files attached to this report
Displaying reports 72161-72180 of 83228.Go to page Start 3605 3606 3607 3608 3609 3610 3611 3612 3613 End