The first half of the shift has been good observing time. IFO is locked in Observing mode, with 22.1w and a range of 79Mpc. Environmental conditions are good. There have been three ETM-Y saturations during the first half of the shift. These were NOT RF45 events.
Reset L4C WD saturation counters on HAM4 and HAM5
Title: 11/09/2015, Day Shift 00:00 – 08:00 (16:00 – 00:00) All times in UTC (PT) State of H1: 00:00 (16:00), The IFO is locked at NOMINAL_LOW_NOISE, in Observing mode Outgoing Operator: Ed Quick Summary: IFO locked in Observing for the past 1.25 hours. Winds are a light breeze (4 – 7 mph), seismic activity is quiet; microseism is centered around 0.4 um/s.
Most of this work was done in September. I thought this stuff was going into one über PEM injection report, but I'll post it here for now. Pieces of this have already been posted in other locations, where relevant. Summary: the only frequency where we have observed coupling from external RF to the interferometer is 45MHz, where the SNR would need to be over 100 in the PEM channel before it shows up in darm.
----------------
We injected RF at specific frequencies where coupling to the interferometer was thought possible. The injections were done using dipole antennas and RF amplifier located by the water tank on site (site chosen for easy access and because its 'far away'). For those injections the 9 MHz and 45 MHz injections were picked up by the PEM radio channels in the corner station electronics bay ~1000x louder than the background. Of the frequencies chosen only the 45MHz injection showed up in the gravitational wave channel.
For the 45MHz injection we saw a PEM antenna SNR of ~1000 and a small peak in darm with an SNR of ~4 when viewed at a ~0.1 Hz resolution. From this we can say that an SNR of 200 in the auxiliary channel would be necessary to produce an SNR of 1 in DARM.
The frequencies chosen are posted at the bottom of the report (in most cases we performed the actual injection at the frequency of interest +100Hz, then looked in DARM for a beat frequency at 100Hz).
Figure 1 shows the 45Mhz injection that appeared in darm. Figures 2 and 3 show a later followup from Oct 23 with a better oscillator source but similar results (at 45 and 9 MHz). The final attachment (pdf) has a summary with more plots.
Future work will include repeat injections with a higher power amplifier and more stable oscillator source.
RF Frequency List (MHz)
9.100230
10.000000
21.500000
24.078360
35.500000
45.501150
71.000001
79.200000
80.000000
TITLE: Nov 6 DAY Shift 16:00-00:00UTC (08:00-04:00 PDT), all times posted in UTC
STATE Of H1: Observing
SUPPORT: Keita, Cheryl, Vern, Richard
LOCK DURATION: ≈2 hrs (this shift)
INCOMING OPERATOR: Jeff B
END-OF-SHIFT SUMMARY: IFO Locked and Observing 78Mpc.
Handing off to Jeff B.
ACTIVITY LOG:
16:00 Peter and Richard going into H1 PSL to troubleshoot RF45 problem
16:05 45MHz issue seems to have corrected itself upon my arrival. I adjusted the RF out gain back to original value as noted in Nutsinee’s aLog(LSC-MOD_RF45_AM_RFSET) aLog #23222
16:06 6.2Mag quake in Aleutians has eq bands up to 10µm/s. Terramon lagged this information ≈33 minutes.
16:15 Joe and Chris headed down X-Arm for beam tube work
17:31 Kyle headed out to X-2-8 to drop off some hardware and then returning.
17:48 Bubba back from EY but heading back for a quick round trip.
18:00 Kyle back
19:19 Keita and Vern will be going into LVEA to further investigate 45Mhz trouble.
20:07 Joe and Chris back from X-arm for lunch
21:12 Keita tell me that I can have the IFO in about 5 minutes!
21:16 Joe and Chris going back out to X-Arm
21:35 begin intial alignment
21:50 Kyle headed back to x-2-8
22:39 IFO locked at NLN
22:48 Robert into LVEA to do injections (≈20min) Then we will proceed to Science Mode
23:34 Joe and Chris back from working on x-arm
2:59UTC
Snapshot before I accepted changes is attached.
I have created a more detailed CDS overview screen customized for O1 operations. It shows the same data as the non-detailed screen and additionally:
SDF data (number of differences and reference file name)
Test Points (number of testpoints opened on the model)
If the SDF diff number is not zero, a red circle is shown. If the numer of testpoints is not zero a blue circle is shown. Note: calibration models are permitted 2 TPs before the circle is shown.
Non-zero CRC accumulated numbers are highlighted with a blue rectangle. A button has been added which permits the operator to clear the accumulated CRC counters.
The screen has been attached to the SITEMAP under the "O-1" pull down.
note that the "DAQ Clear Accumulated CRC" button communicates with the DAQ data concentrator. It would be preferable to only press this when H1 is not in observation mode. The same goes for the command button next to the EDCU red/green status (labled with a single exclamation point) which lists non-connected EPICS channels.
Tagging OpsInfo
MID-SHIFT SUMMARY: The ongoing struggle for 45MhzRFAM stability is the order of the day so far. We’ve been down from a strong Alaskan earthquake since early this morning. The mode cleaner was successfully relocked after a 2µ radian pitch adjustment was made to MC2. There were no ISI nor HEPI trips. I’m awaiting the “go-ahead” to start the re-locking process upon Keita’s approval.
With the control room watching the glitch monitor for the 45MHz. I went through the connections of the RF chain. It seems that the most likely cable the could cause a problem is the run from the Rack by the PSL to the EOM driver in the enclosure. I was able to produce glitches while moving this cable. We have replaced the Cables and the 1db attenuator for this run. This new cable also replaces the short loop used for phasing at the rack end. Hopefully this will fix our problem. If it does not the next move will be the driver itself.
It still glitches once in a while.
I'll install a coupler and a mixer to demodulate the PSL-45MHz signal by the 45MHz distribution amplifier output and monitor it using one of the ADC channels.
Done, nothing was fixed, need to watch out for the next episode (Vern, Keita).
In the attached left, at the beginning after Richard and Fil swapped the cable, RF45 was still glitching. After 19:03:50 mark there was a large glitch, that's when I decided to go in, and I wrote the above alog. The hope was to see if the glitch is likely to come from the upstream or not.
Of course, right after the glitch, it stopped glitching but I didn't know as I was preparing for the incursion.
I and Vern inserted a 20dB coupler to the PSL-45MHz line on the balun on the ISC rack, demodulated it using 45MHz distribution amplifier output from the ISC rack next to it, used a 1.6MHz(?) LPF, a 50 Ohm terminator, and finally SR560 to condition the signal.
SR560 setting was DC in, output zero at 1Hz and pole at 10kHz, with the gain of 2E4 with high dynamic reserve mode. (When DC coupled, the output was 2.3V with DC gain of 200).
The output of SR560 was connected to H1:LSC-EXTRA_AI_1 channel.
We waited for 40 minutes for a glitch but it did not happen (attached, middle and right).
Coupler was disconnected from the ISC rack, 45MHz distribution amplifier output was terminated, but the coupler/mixer/SR560 are left on the floor so it's easily put back on next time.
45MHz phase adjustment
Since RF cable was swapped (and the coil removed), I measured the RF phasing again. Using free swing MICH and measuring the TF from H1:LSC-ASAIR_A_RF45_I_ERR to Q, the phase was measured to be atan(3.45)=73.8deg.
I added a female-female and male-male N barrel in series and it was atan(4.50+-0.04)=77.5+-0.1 deg.
We are shooting for 76.4deg, and last time we adjusted it we ended up 77.3+-0.03, so I decided to go with 77.5+-0.1 deg.
IFO is currently down due earthquake. IMC/FSS stability is still erratic.
Not 100% sure but it seems to me that after this morning's activities, the reference cavity reflected spot (as monitored on video3 in the Control Room) has moved from something close to 12 o'clock to around about 2 o'clock. The reference cavity transmission seems to have increased a little. One can clearly see the effect of the HEPA fan units.
Tidal and ASC (PRCL1, DHARD) was running away.
The ifo is locked at NLN but not observing. RF45 still glitching.
Lockloss again at 07:00 UTC
DHARD ran away again. I lowered the gain as soon as I noticed the oscillation. The amplitude of the oscillation didn't seem to decrease. Maybe I didn't catch it quick enough?
I also couldn't connect to the nds sever. So no dataviewer.
I will be taking a few minutes to grief.....
Dataviewer seems to work on a different computer. Resume relocking.
Hmmm, maybe we just should always be using the lower DHARD gains when we're on the 45mHz ISI blends? I think DHARD Pit is usually 10, and should go to 7. DHARD YAW is usually 15, and should go to 10.
I don't think that the oscillation that nutsinnee shows in the screen shot is the one that can be fixed by lowering the gains, that is around 0.6Hz, while the screenshots show an something happening at around 20mHz. This large low frequency motion of DHARD yaw was happening durring earthquakes durring ER8.
I would be more inclinnded to leave DHARD gains alone or try to increase the low frequency gain for Yaw, depending on what was really happening (was this ground motion or a loop oscillation?). I think that lowering the gain could actually make things worse in either case.
For a rough model of DHARD yaw loop with thee new boost added, see https://alog.ligo-wa.caltech.edu/aLOG/uploads/21768_20150921225603_DHARDYAWOLGwithboost.png
NOTE: This entry is related to 22847 and 22959
This entry is a summary of the 3rd and 4th harmonic frequencies of the QUAD suspensions violin modes. The frequency identification was done through 2 stages;
1) First looking at a 1mHz resolution spectrum of channel H1:OMC-DCPD_SUM_OUT_DQ on 10800 seconds from 2015-10-28 12:00:00 (before the test mass injections described in 22959), total of 20 averages and 50% overlap. See plots attached. This gave a first approximate value of the frequencies.
3rd harmonics (32 modes identified): Attached file: '3rd_Harmonics_from_Spectrum.txt'
4th harmonics (30 modes identified): Attached file: '4th_Harmonics_from_Spectrum.txt'
2) Second, feed the above frequencies to a line tracker (iWave) for a more accurate identification and over different data. In particular 21 hours of data with detector in Observing mode and with damping filters turned off, from 2015-10-21 21:30:00
3rd harmonics (22 modes identified, notice that the reason for the smaller number of modes being identified is the automation applied to the line tracker in order to be able to process the big number of modes being tracked over a long data stream. For this reason the line tracker sometimes locked to the wrong mode of higher amplitude and or was not able to separate modes of high amplitude and proximity. The number of modes identified may improve by more targetted application of the tracker): Attached file: '3rd_Harmonics_from_LineTracker.txt'
4th harmonics (25 modes identified): Attached file: '4th_Harmonics_from_LineTracker.txt'
For reference, here are the compilations of tentative 3rd/4th quad harmonic frequencies from 104.5 hours of early O1 data, using 0.5-mHz binning: Q 1456.1793 1.109279e-18 ******* Q 1456.8448 4.093626e-19 ***** Q 1461.4125 3.152596e-19 ***** Q 1461.7318 1.663059e-17 ********** Q 1461.8627 2.275449e-19 ***** Q 1462.0311 9.120542e-17 ************ Q 1462.3129 1.442451e-16 ************* Q 1462.5991 1.951920e-18 ******* Q 1463.0994 1.613099e-17 ********** Q 1467.4759 9.898746e-18 ********* Q 1467.9648 1.940260e-16 ************* Q 1470.3809 7.576511e-17 ************ Q 1470.8263 1.099916e-16 ************* Q 1471.9279 1.821525e-16 ************* Q 1472.4505 9.761998e-17 ************ Q 1472.5268 7.321176e-18 ********* Q 1474.0800 1.401120e-16 ************* Q 1475.0976 3.710737e-17 *********** Q 1475.2510 2.168896e-16 ************** Q 1476.3779 4.452248e-18 ******** Q 1478.1701 2.011867e-16 ************* Q 1478.6459 2.489583e-18 ******** Q 1482.5840 6.298267e-16 *************** Q 1484.0765 3.847696e-16 ************** Q 1484.4293 7.193998e-18 ********* Q 1484.5241 2.194240e-16 ************** Q 1484.5731 1.033684e-17 ********** Q 1484.6685 2.331379e-16 ************** Q 1922.9259 4.402502e-18 ******** Q 1923.6124 2.213001e-17 *********** Q 1923.8550 3.272046e-18 ******** Q 1923.8610 1.089465e-17 ********** Q 1924.6739 2.196115e-17 *********** Q 1924.9150 1.129535e-17 ********** Q 1926.2402 9.830786e-17 ************ Q 1927.4652 5.627035e-18 ********* Q 1927.4662 5.627035e-18 ********* Q 1928.4620 1.166487e-17 ********** Q 1929.3128 2.991775e-18 ******** Q 1931.5738 2.536072e-18 ******** Q 1932.1391 1.111758e-17 ********** Q 1932.3359 3.306404e-17 *********** Q 1932.6117 3.029987e-17 *********** Q 1940.3232 3.044162e-18 ******** Q 1940.6643 2.881532e-17 *********** Q 1941.3501 9.968986e-17 ************ Q 1942.1270 1.072596e-18 ******* Q 1942.1751 6.163310e-17 ************ Q 1942.3900 6.222474e-17 ************ Q 1943.7780 1.641306e-17 ********** Q 1944.1332 3.131086e-18 ******** Q 1946.7318 4.684879e-17 ************ Q 1947.7089 1.957731e-18 ******* Q 1954.4574 1.942626e-17 ********** Q 1955.9208 2.102610e-17 ********** Q 1957.3347 3.023210e-17 *********** Q 1959.0215 4.312900e-17 *********** where the 2nd number is the inverse-noise-weighted average displacement ASD, and the asterisks are a crude log-scale depiction of the ASD value. This table is a subset of this earlier alog attachment: https://alog.ligo-wa.caltech.edu/aLOG/uploads/21982_20150926195339_Lines_H1-CAL-DELTAL-EXT_O1-week1.txt Although the frequencies are given to 0.1 mHz precision, I have seen them vary in the past by as much as a few mHz over months time scales.
Thank you Keith. I was aware of this frequency list however I noticed that several modes were missing. In principle if mode frequencies do not overlap then we should expect 32 modes per harmonic. In my manual check of the 3rd harmonic frequencies I identified 32 frequency candidates with a few others of small amplitude. In comparison with your list I can confirm that your list misses several 3rd harmonic modes:
There are two very close modes at 1463.097 and 1463.101 Hz, your list only identifies one mode from this pair at 1463.0994Hz. Also your list misses the mode at 1472.217Hz.
In relation to the 4th harmonic: Your list shows a repeat peak at 1927.465Hz, although it assigns a 1 mHz difference between the 2 peaks the amplitude is identical so it looks as if it is actually a single peak.
Notice that the main reason of my analysis is not just to identify the violin mode frequencies but to actually measure their Q (through exponential decay) which I will report in another aLog which I am writting at the moment.
UPDATE ON ORIGINAL ENTRY:
Some of the peaks I originally identified as 3rd and 4th harmonics from the 1mHz resolution spectrum plots are not violin modes, as verified after careful analysis of their exponential decay with a line tracker (iWave).
3rd harmonic identified modes: 30 with Spectrum of 1mHz resolution, the line tracker locked properly to only 25.
4th harmonic identified modes: 26 with Spectrum of 1mHz resolution, the line tracker locked properly to only 25.
For completion I provide next the frequencies of the identified modes, on a table of 3 columns, the first column are the frequencies given by Keith, the second column are the frequencies as per the 1mHz spectrums shown in this entry and the third column are the median frequency tracked by a line tracker on 21 hours of data. The zeros are missing information from each list:
Keith_table 1mHz_res_spectrum Line_tracker_21hours_data
1.0e+03 *
1.456179300000000 1.456180344722471 1.456177151198640
1.456844800000000 1.456847712651581 1.456842618595428
1.461412500000000 1.461413707108750 1.461409317387718
1.461731800000000 1.461733620917401 1.461732469282266
1.461862700000000 1.461861606048793 1.461859532596437
1.462031100000000 1.462032270322383 1.462031865574721
1.462312900000000 1.462313909933999 1.462313301797892
1.462599100000000 1.462599872305624 1.462596623730558
1.463099400000000 1.463097080131224 1.463096689345246
0 1.463100546759006 1.463100039151534
1.467475900000000 1.467476228900213 1.467475846153371
1.467964800000000 1.467965366395409 1.467964868969873
1.470380900000000 1.470381699013083 1.470380789546349
1.470826300000000 1.470827285183412 1.470826225123052
1.471927900000000 1.471929276656110 1.471928631371064
0 1.472217057788634 1.472216372878212
1.472450500000000 1.472451085888389 1.472450299085779
1.472526800000000 1.472528816242792 0
1.474080000000000 1.474080396944674 1.474079862541953
1.475097600000000 1.475099020030272 1.475097416001178
1.475251000000000 1.475252651191380 1.475251394384721
1.476377900000000 1.476379150480257 0
1.478170100000000 1.478170077745102 1.478169573722027
1.478645900000000 1.478646456410533 0
1.482584000000000 1.482587879011576 1.482585385731902
1.484076500000000 1.484082047455499 1.484077440343936
1.484429300000000 1.484431224630876 0
1.484524100000000 1.484525638863272 1.484525699339724
1.484573100000000 1.484573390876472 0
1.484668500000000 1.484669984871669 1.484668763161195
1.922925900000000 1.922927022647360 1.922925588791648
1.923612400000000 1.923613112500675 1.923612097950808
1.923855000000000 1.923855111277119 1.923854588725318
1.923861000000000 1.923862018275805 1.923861256988942
1.924673900000000 1.924674100071188 1.924673358918374
1.924915000000000 1.924915873423103 1.924914735873632
1.926240200000000 1.926241192663720 1.926240582396548
1.927465200000000 1.927466117175330 1.927465533945791
1.927466200000000 0 0
1.928462000000000 1.928465010303079 1.928461858686449
1.929312800000000 1.929315906067996 1.929312798521826
1.931573800000000 1.931575488954602 1.931573475268973
1.932139100000000 1.932140403468284 1.932139817442099
1.932335900000000 1.932335886291686 1.932335653144635
1.932611700000000 1.932611738162179 1.932612502374920
1.940323200000000 1.940327437428355 1.940322842326236
1.940664300000000 1.940668395302165 1.940663844123977
1.941350100000000 1.941355862583405 1.941349656248626
1.942127000000000 0 0
1.942175100000000 1.942176424197661 1.942174876991754
1.942390000000000 1.942391628419225 1.942390477296026
1.943778000000000 1.943779225301499 1.943777686818187
1.944133200000000 1.944135400000000 0
1.946731800000000 1.946734993919390 1.946732788506648
1.947708900000000 0 0
1.954457400000000 1.954461746453794 1.954459288744910
1.955920800000000 1.955924562578534 1.955921817650888
1.957334700000000 1.957335449254732 1.957335075248596
1.959021500000000 1.959024110148374 1.959023577426715
