3-30 mHz noise in BRS and T240

K. Venkateswara

I have attached ASD plots from 30k second-data from the BRS and the ground T240 seismometer x channel measured last night, when wind-speeds were fairly low. The first plot is in angle units and the third is in meters. I have also shown the tilt-subtracted ground super_sensor in red.

Both BRS and T240 look similar, but have no coherence. The amplitude of BRS looks lower between 8-20 mHz than the T240X, while it looks higher below that. Note that I have corrected for the transfer function of the T240 (double pole at 4.3 mHz).

The noise level between the two instruments also seems to vary with ground motion. Last Friday, Brian Latnz had suggested that it might be cross-coupling between different axes. This made me wonder if it was due to down-conversion from higher order modes of the beam-balance. I had seen similar issues with it in the lab at UW, which were mitigated when I added some vibration isolation in the form of rubber pads under the platform. So, I tried the same thing under the BRS platform on Monday morning. However, there was no change in the "noise" level as seen in the plots. It may still be cross-coupling in BRS or T240, but it doesn't seem to be the same type of down-conversion that I observed in the lab.

Added 250 mL H2O to the H1 PSL chiller

WHAM3 ISI Conversion Matrices Changed & Snapped

Changed the Local to Cartesian to Actuator matrices on HAM2 ISI  to as per T1000388.  Unlike HAM2, Guardian had no problem reisolating.  Repeated several times, all good.

WHAM2 ISI Taken down to Collect Safe.Snap

Committed to SVN. New Local to Cartesian to Actuator Matrices (Changed Monday but I didn't get snapped) saved.

UIM Coil Driver returned to Quad Test stand electronics rack

The UIM coil driver S0900300 was modified as per E1400164. It was retested for noise and transfer function. The new, raw data will be zipped and posted to it's DCC record. Please inform me of any malfunction due to the removal/replacement of this chassis.

EMTX ISI cart matrices updated, safe.snap committed

While preparing to revisit tilt decoupling at ETMX, I used the opportunity to correct the input and output matrices for the ISI. A new safe dot snap has been made and committed to the SVN. I will also be changing the guardian configuration and changing the blends, it will take a couple minutes to revert if anyone needs it back.

morning meeting notes

Aidan to check coupling between ITMX and ITMY Hartmann sensors
Aidan to check alignment of the X arm CO2 laser on the compensation plate
Richard checking Beckhoff for illuminators at the end stations
Cable work in the LVEA
Jim W. and Krishna to run tilt/decoupling measurements for ETMX SEI
Doug to look at optical levers
Jeff B. to bring in table from staging building on pallet jack
3IFO quad suspension assembly work continuing
Rai W. running purge air and scrollpumps at ETMY for ionizer test
end Y to be transitioned to laser safe

ITMX RH heating/measurement test successful

The heating test of the ITMX with the RH and coincident HWS measurement was successful. The usual negative thermal lens was observed to form in ITMX in response to 4.035W total electrical power into the RH.

t = 0 is defined as when the RH was turned on. tmax is defined as when the value of spherical power peaks.

• The difference in SPHERICAL_POWER from t0 to tmax was -135 micro-diopters
• The difference in PRISM_X (YAW) from t0 to tmax was approximately  -0.25 micro-radians.
• The difference in PRISM_Y (PITCH) from t0 to tmax was approximately +2.1 micro-radians

The center of the lens is located at -[+2.1, -0.25]/(-135) m = [+16, -2]mm 

CDS model and DAQ restart report, Monday and Tuesday 27th,28th October 2014

model restarts logged for Mon 27/Oct/2014
2014_10_27 09:15 h1iopseih45
2014_10_27 09:17 h1hpiham4
2014_10_27 09:17 h1hpiham5
2014_10_27 09:17 h1isiham4
2014_10_27 09:17 h1isiham5

restart of IOP to reset DAC enable error. No unexpected restarts.

model restarts logged for Tue 28/Oct/2014
2014_10_28 07:08 h1lsc
2014_10_28 07:14 h1susetmx
2014_10_28 07:14 h1susitmx
2014_10_28 07:16 h1susetmy
2014_10_28 07:16 h1susitmy
2014_10_28 07:30 h1broadcast0
2014_10_28 07:30 h1dc0
2014_10_28 07:30 h1fw0
2014_10_28 07:30 h1nds0
2014_10_28 07:30 h1nds1
2014_10_28 07:31 h1fw1
2014_10_28 08:03 h1susauxex
2014_10_28 08:04 h1susauxey
2014_10_28 10:09 h1hpiitmx
2014_10_28 10:09 h1iopseib3
2014_10_28 10:09 h1isiitmx
2014_10_28 10:24 h1hpiitmx
2014_10_28 10:24 h1iopseib3
2014_10_28 10:24 h1isiitmx
2014_10_28 10:41 h1hpiitmx
2014_10_28 10:41 h1iopseib3
2014_10_28 10:41 h1isiitmx
2014_10_28 13:14 h1fw1
2014_10_28 13:14 h1nds1
2014_10_28 13:15 h1nds1
2014_10_28 16:11 h1broadcast0
2014_10_28 16:11 h1dc0
2014_10_28 16:11 h1fw0
2014_10_28 16:11 h1fw1
2014_10_28 16:11 h1nds0
2014_10_28 16:11 h1nds1
2014_10_28 16:35 h1broadcast0
2014_10_28 16:35 h1dc0
2014_10_28 16:35 h1fw0
2014_10_28 16:35 h1fw1
2014_10_28 16:35 h1nds0
2014_10_28 16:35 h1nds1

Maintenance day: SUS, LSC and SUSAUX model work (with DAQ restart). h1seib3 bad ADC interface card/cable investigation. h1ldasgw1 raid work. DAQ restart to support HEPI pump ctrl and Beckhoff changes.

ETMX ISI is in a test configuration

I ran the script that Hugo prepared for me at around 7:34:30 in UTC or 0:34:30 in PDT. I confirmed that it successfully switched the blend filter for Z in ETMX ISI to the one he wanted to test. I am leaving it in this configuration as requested by Hugo.

Those who perform X arm comissioning tomorrow should not forget to switch it back to the nominal configuration by running:

/ligo/svncommon/SeiSVN/seismic/BSC-ISI/H1/Common/Misc/Test_Configuration_Scripts/Switch_To_Comm.py

 

Note:

before running the script, I steered ETMX to an angle which is far enough from the aligned value so that it does not interfer with the corner locking but still gives an OK centering for oplev. This resulted in  (PIT bias, YAW bias) = (403, 86).

arm cavities increases SRC mode hops ?

Alexa, Sheila, Kiwamu,

We are concluding that the DRMI seems to have a high rate of the SRC mode hops when the arm cavities are present. At this point, it is unclear why.

 

(A comparison test with and without arm cavities)

We locked the DRMI while holding the arm cavities at a off resonance point (750 Hz away from resonance in IR) by ALSs. The number of the mode hop was as high as once a second or so. As usual, a SRCL offset of -800 cnts could help reducing the mode hops and also aligning the DRMI helped it as well. However we could not completely get rid of the mode hops at the end. So we quickly switched back to a simple DRMI by misaligning ETMs to determin whether if it is an issue only when the arms are resent. Indeed, the simple DRMI locked and stayed without a mode hop. So the arm cavities really increase the rate of the mode hops.

Note that there was a good DRMI stretch starting at Oct-29 7:00 UTC.

We also tried engaging the ASC loop that had been tuned up for a simple DRMI. This did not look very promising as it was not able to reduce the number of mode hops. It may have been a situation where the ASC was not able to correctly work because of too many hoppings. We don't know what exactly was going on yet.

(Some ETM suspension adjustment for DIFF loop)

The roll mode rang up tonight as well in ETMY. We decided to use only ETMX until the roll mode settles down. Also we changed the L3 gain from 0.8 to 1.1 in ETMX because we saw an oscillation at the cross over frequency at around 2-ish Hz when the gain was at 0.8 and ETMY was disabled. We could not push the UGF of the DIFF loop to 10 Hz because of saturation in the ETMX ESD supposedly due to the roll mode dominating the rms. We decreased the overall LSC UGF by a factor of 2 or so in order to avoid the saturation.

At some point, we were suffering by an issue of the X arm being misaligned as the LSC feedback got bigger. This turned out to be a bad L2P decoupling in the L2 stage which Sheila turned off (alog 14428) because the filter was thought to be bad. We have no idea what has changed since then, but it was obvious tonight that the L2P decoupling filter really helped the decoupling and improved the stability of the DIFF loop a lot. We now enabled it.

(SR3 opelv damping loop was off)

When locking the DRMI, we noticed that a pitch mode of an optic was too large that it was inducing more mode hop in the SRC. We identified it to be SR3 whose oplev pitch loop had been switched off. So we switched it back on and this helped the stability of the DRMI.

maintence day recovery

Sheila, Patrick, Daniel, Alexa, Chris, Kiwamu, Evan

Before we started commissioning tonight, we had to recover from some maintenance day activities. 

• The timing system had some problems, which was difficult to diagnose at first because there were many erroneous error messages from the timing system.  Once we got rid of most of these (by going into the master visualizations in the PLC on the beckhoff machine, and clicking on the icons for each fanout that doesn't have anything connected) The remaining errors were for End Y VCXO control voltage (this has been this way for a year or so according to Daniel) and a missing communication for the End Y Fanout.  Daniel fixed this by restarting PLC1, it is not clear what caused the problem or why restarting the PLC would fix it.  It would probably make understanding/maintaining the timing system easier if we had some more complete medm screens for it.

• /sus/common/scripts/sustools.py was edited today, apparently in a way that made our save alignment script no longer work.  We reverted to the version in the SVN, which fixed that problem.  The SUS guardians also complained about invalid syntax on line 63.  the version which was edited today is saved as sustools_oct28.py

• the new version of cdsutils seems to have a nonfunctional avg function, or at least a version which has different usage than the old version, which we could not decipher from the help.  We also recovered from this by reverting to the old version.  (some of our guardians use this, so if the usage is changing we need to be aware ahead of time).

• Apparently after the quad model changes the value of L3_LOCK_INBIAS was set to 0 (it should be 9.5) and the filter which was previously loaded in FM1 (a calibration into volts) disappeared.

• The pop shutter was closed, this might not be related to maintenance.

peek at PR2 baffle

Alexa, Kiwamu,

In response to Keita's alog about the PR2 baffle, we took a peek at the PR2 baffle by opening some of the viewports on HAM3 and HAM2 spool.

Conclusions:

• The aperture hole on the baffle looks centered.
• The baffle in front of PR2 looks the right one.

 

(PR2 baffle check out)

We opened up a viewport on the East side of HAM3 which the leftmost one with an illuminator attached on. This was the only available viewport to open up. We removed the illuminator and looked at the baffle through the viewport. We confirmed that there was no cross bar structure on the side of the baffle unit as shown in the DCC document (D1000328). We could not see the top part of the baffle where it supposed to have a cross bar structure. We took some pictures and I attach them to this entry.

(Peek at the aperture position)

Then we tried a different zooming in the PR2 digital camera in order to have a better view so that we can determine if the aperture hole is in the middle of the baffle unit or not. With a help of flash light illuminating the PR2 baffle from the HAM2 East side viewport, we could clearly see the edge on both right and left sides of the unit as well as the edge of the aperture. It looked like the hole is centered with respect to the right and left edges of the unit. We took several pictures of it via the digital camera so that one can evaluate the position later if necessary.

(MC2 scraper baffle check out)

Then we opened up another viewport on the West side of HAM3 in order to see both MC2 and PR2 baffles. Though, the MC2 baffle was completely occulting the PR2 baffle and therefore we could not see it. We could still confirm that the MC2 baffle has a cross bar structure on the side as shown in the design document (D1000327).

HAM-ISI & HEPI MEDM Overview Screens Updated

Similar to what was rolled-out earlier today for the Suspensions (see LHO aLOG entry 14657), I've now svn'd up the latest HAM-ISI & HEPI MEDM Overview screens, which includes the embedded Guardian mini control-panel providing access to requestable states, as was developed at LLO (see LLO aLOG entry 15010).

The following MEDM screens were updated:-

/opt/rtcds/userapps/release/isi/common/medm/hamisi/
U        ISI_CUST_CHAMBER_OVERVIEW_LARGE.adl
U        ISI_CUST_CHAMBER_OVERVIEW.adl

/opt/rtcds/userapps/release/hpi/common/medm/hepitemplate/
U    HPI_CUST_CHAMBER_OVERVIEW.adl

Screen-shots of the updated HAM-ISI & HEPI MEDM Overview screens are attached below.

updated conlog channel list

added 802 channels
removed 524 channels

RHX test scheduled to run at

I've scheduled a RH-X test to run from around 2:45AM for 5 hours. 

CDS maintenance summary

SUS and LSC model changes. Jeff K

many sus models and LSC were changed. New IPC added between them. susaux models at end stations also changed.

HEPI Pump Controller. Hugh R

new EPICS databases started on EX and EY HEPI pump controllers. MEDM changed accordingly.

DAQ FW1 file system increase. Jim, Dave, Dan

h1ldasgw1 file system grown to use two raids.

Patch and Restart Workstations. Cyrus

All CDS workstations patched and restarted

Beckhoff changes. Patrick

Beckhoff systems for C1 (PLC1,3) X1 (PLC3) and Y1 (PLC3) modified.

DAQ reconfigured. Dave

DAQ reconfigured for Beckhoff and HEPI pump controller and susaux(ex,ey) changes. Restarted twice, needed start_streamers on various frontend after second restart.

Installing SUS DRIFTMON. Jim, Dave

Installing a test version of driftmon which doesn't require additional EPICS records. Testing NDS2 data collection parameters.

guardian/cdsutils upgrades

I upgraded the guardian core and cdsutils (python ezca) installs:

• guardian r1095: better error handling, minor bug fixes
• cdsutils r359: NDS interface improvements (handle channels without IFO prefix), fix avg function, add filter module decoding utility (cdsutils sfm)

I restarted most of the nodes, except for the following:

jameson.rollins@opsws2:~/src/cdsutils/trunk 0$ guardctrl list | grep -v 1095
node         s k m vers  state                                    message
----         - - - ----  -----                                    -------
ALS_COMM     o - -    -  -                                        -
H1ECATC1PLC2 *   E 1076  INIT                                     
H1ECATX1PLC2 *   E 1076  INIT                                     
H1ECATY1PLC2 *   E 1076  INIT                                     
H1ISCEX      *   E 1076  INIT                                     
H1ISCEY      *   E 1076  INIT                                     
H1LSC        *   E 1076  INIT                                     
H1LSCAUX     *   E 1076  INIT                                     
HPI_HAM2     * * M 1083  ROBUST_ISOLATED                          
IAS_INPUT    o - -    -  -                                        -
IAS_MICH     o - -    -  -                                        -
IAS_PRC      o - -    -  -                                        -
IAS_SRC      o - -    -  -                                        -
IAS_TEST     o - -    -  -                                        -
IAS_XARM     o - -    -  -                                        -
IAS_YARM     o - -    -  -                                        -
IFO_ALIGN    o - -    -  -                                        -
ISC_LOCK     o - -    -  -                                        -                            
ISI_HAM2     *   P 1083  WATCHDOG_TRIPPED_FULL_SHUTDOWN           WATCHDOG TRIP: FULL_SHUTDOWN (4)                       
LSC          *   E 1076  INIT                                     
LSC_PRMI_VAR_FINESSE *   E 1083  DOWN                                     MISALIGN PRM
LSC_PRX      *   P 1083  FAULT                                    check LSC input matrix, ITMY not MISALIGNED
LSC_PRY      *   P 1080  FAULT                                    PRM not ALIGNED, ITMX not MISALIGNED
SEI_HAM2     *   P 1083  ISOLATED                                   
SUS_MC1      * * E 1080  ALIGNED                                  
SUS_MC3      * * E 1080  ALIGNED                                  
SUS_PR3      * * E 1080  ALIGNED                                  
SUS_PRM      * * M 1083  ALIGNED  

The non-running nodes (s='o') had various errors on restart, so I shut them down until they can be fixed.  I shut down all the IAS nodes since I was told they're not in use.  The HAM2 nodes were not restarted because Hugh was in the middle of doing some SEI work on HAM2.  The nodes starting with "H1" are the "CSDEF" nodes (not sure what the status of those is).  I'll restart these nodes when I'm sure it's ok.

I noticed that there are a couple of "hidden" nodes, that are not listed in the Guardian overview screen:

H1ECATC1PLC2 *   E 1076  INIT                                     
H1ECATX1PLC2 *   E 1076  INIT                                     
H1ECATY1PLC2 *   E 1076  INIT                                     
H1ISCEX      *   E 1076  INIT                                     
H1ISCEY      *   E 1076  INIT                                     
H1LSC        *   E 1076  INIT                                     
H1LSCAUX     *   E 1076  INIT   LSC          *   E 1076  INIT                                     
LSC_PRMI_VAR_FINESSE *   E 1083  DOWN                                     MISALIGN PRM
LSC_PRX      *   P 1083  FAULT                                    check LSC input matrix, ITMY not MISALIGNED
LSC_PRY      *   P 1080  FAULT                                    PRM not ALIGNED, ITMX not MISALIGNED

We should be very careful about these.  If they're being used, they should be on the overview.  If they're not being used, they should be shut down.  Do not leave running nodes off of the overview screen