TITLE: 12/03 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:
LOG: Quiet shift, been locked for just about 10 hours. DIAG_MAIN has been notifying "PSL ISS diffracted power is low" its around 2.8 right now.

J. Freed,

On Wednesday Nov 20th, the Double Mixer topology for SPI D2400315-x0 was taken, and it works how we intended as a way to gerenrate a 80MHz - 4096Hz signal it to but with alot of noise.

DMPrototype.png Is a diagram of the Double Mixer Design

DM_First_Test.png Is a diagram of the test done on the Double Mixer, this inital test was just to check that the Double Mixer produces the expected output signal frequency, as such, the amplifier was ignored. 

DM_FT_Result.png Shows the output on the scope.  Blue is the double mixer output. White is a reference of SRS SG382 (sync with 80 Mhz OCXO via 10 MHz Timing) with a frequency of 79,995,904 Hz and power of -0.91 dBm. The SRS signal, timed with the OCXO, and the double mixer correctly locks with eachother. This gives credance that this design will work for the goal of the double mixer; a 79,995,904 Hz signal frequency locked to a 80MHz OCXO. However there is a lot of noise in the double mixer signal. An ongoing investigation is currently underway to find and reduce this noise.

ZMSCQ_Wave_Shape.png Shows a possible source of the noise, the Double Mixer requires phase delayer for the Sin path, we used a MiniCircuts ZMSCQ-2-90B for this. I tested the ZMSCQ-2-90B by puggining the input of the signal and the signal from the 2 ports into osciloscope. I split off the input signal with a Minicircuts ZMSC-2-1BR+ (Summer/Splitter) and I had to normalize input power pickoff in postprocessing by a factor of 0.68 due to the power difference. The results show that the output of the ZMSCQ-2-90B has a sligtly different shape than what was plugged in. With the delay port (orange) having a slight "hump" on the rise. Will retake with a faster osciloscope, as the signal is very noisy.

The investigation is continuing with the next step of checking the double mixer output signal with a network anaylizer to check the frequencies around 79,995,904 Hz. A Phase noise measurement would also work with the caviot that the phase adjust to destructivly interfere the double mixer signal with the reference signal would have to be adjusted manually.

Sheila and I were looking at one of the most recent ETMX glitch locklosses and found something interesting. About 150ms before this particular lockloss there is a glitch that saturates L3, which seems to be between a few hundred hz and 1khz. The glitch is big enough to propagate to L2 and L1 very quickly. The IFO rides out one glitch, but seems to lose lock during a similar glitch immediately after. There were also 4 other glitches that looked kind of similar during this lock, that didn't cause a lockloss. The open loop for the ESD is around 70 hz, so we think it might be possible to add some more low pass to reduce the drive on the ESD, and reduce the chance of saturating the dac. I'm looking at that.

While trying to understand the path to the dac on this SUS, Sheila and I had a hard time finding the custom screen for the parts added to the top of the ETMX sus model for the 32-bit (-ish?) DAC on that suspension. It lives on the WD tab on the sitemap, it's called DAC_TEST. Shown in the second image. There are calibration gains of 275.310 applied to top level filter banks on the output of the model, these filter screens can be opened by clicking on the rows of black OUT GAIN and OUT VAL epics readbacks on the bottom of the screen. I don't think clicking any of the 0|1 buttons in the middle of this screen is safe.

TITLE: 12/03 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  Currently Observing at 157Mpc and have been Locked for 4.5 hours. Today we had some trouble getting DRMI to lock, and a lockloss from TRANSITION_FROM_ETMX, but nothing too difficult to fix and bypass.

LOG:

15:30 Observing at 157Mpc and have been Locked for over 2 hours

16:33 Out of Observing for Commissioning
16:58 Lockloss due to commissioning activities
    - During relocking, stopped at DRMI_LOCKED_CHECK_ASC because SRM M3 and M1 LF/RT were railed. Clearing SRCL1 history fixed M3, but not M1 LF/RT. We cleared the history on the M1 locking filters, leading to a lockloss and SRM trip. This issue happened because during the commissioning before the lockloss, SRM was accidentally moved so far out of alignment that during DRMI, ISC_LOCK thought that the lock it caught was DRMI when it was actually PRMI, which caused it to push super hard on SRM
    - Lockloss from LOWNOISE_ESD_ETMX
        - Next time we finished TRANSITION_FROM_ETMX, I waited 9 seconds after it completed before moving on to LOWNOISE_ESD_ETMX
    - Multiple locklosses from lower states like ALS and IR

20:02 NOMINAL_LOW_NOISE
20:08 Observing                                                                                                                                                                                                                                                                                                                                    

TITLE: 12/03 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 0mph Gusts, 0mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.34 μm/s
QUICK SUMMARY: Observing for over 4 hours, calm environment.

Closes FAMIS26449 ,last checked in alog80350

BRS-Y temperature looks to be slowly trending upwards since ~10/22.

Mon Dec 02 10:12:17 2024 INFO: Fill completed in 12min 13secs

Gerardo confirmed a good fill curbside.

WP12223 FRS32776

Jonathan, Erik, Dave:

cdslogin is currently down for a rebuild following a disk failure yesterday. Alarms and Alerts are currently offline. EDC has 58 disconnected channels (cdslogin epics_load_mon and raccess channels).

Sheila, Dripta, Camilla. Repeat of 78776

Turned off H1:LSC-SRCL1_OFFSET with ramp time at 10s. Offset off made the FCC drop ~2%. See attached plot. Left H1:LSC-SRCL1_OFFSET off.

Turned SRC1 ASC loops inputs off (would have quickly with ramptime 0.1s turned off offsets too but offsets were already off). Set the ramp to 10s, turn gain to 0, clear history, gain back to 4.

We then started stepping SRM Y in steps of 0.5. This was too big, we lost lock (sorry). It seems we actually moved 500+ urad rather than the expected 0.5urad and this caused a lockloss <0.5s latter, plot attached. Sorry. I moved the alignment slides back while Oli was locking as they are getting SRM saturations.

We would have aimed to increase H1:CAL-CS_TDEP_F_C_OUTPUT with SRM moved (SRC2 was left closed and would have moved SR2 to compensate). Then this SRM location could have been used as the SRSCL1 ASC offsets.  Then we could have taken a SQZ FIS dataset (eg 80318) to find the best SRCL offset.

Lockloss @ 12/02 16:58 UTC after 3:39 locked due to commissioning activities

TITLE: 12/02 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.46 μm/s
QUICK SUMMARY:

Observing and have been Locked for over 2 hours. Secondary useism looks to be going up a bit in the past few minutes.

TITLE: 12/02 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 142Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: A long relock today from DRMI locking struggles and lock losses at Transition_From_ETMX. Once back up to observing the range hasn't been very stable, hovering between 140-150Mpc. I was waiting for a drop in triple coincidence before trying to tune squeezing, but that didn't happen before the end of my shift. The 15-50Hz area in particular looks especially poor.
LOG:

• Relocking notes
  • MICH and PRMI caught no problem, but DRMI would not catch. I tried moving SRM but nothing seemed to work. MICH and SRCL were triggering and flashes looked good. I ended up doing an initial alignment but skipping green alignment since this looked good before.
  • DRMI had basically no flashes after initial alignment. Odd. Did MICH and then couldn't lock PRMI. Trying a full initial alignment.
  • Flashes better this time, but it still took 4 min to lock. Finally locked DRMI though.
  • Lost lock at Transition_From_ETMX
  • And again.
  • One more lock loss at Transition_From_ETMX. I had it sitting in this state for 5 min while I was looking at the state code, then there was an ASC pitch ringup. I'm not sure which was the worst of the ASCs.
  • Another initial alignment. Another struggle for DRMI after PRMI and with seemingly great flashes.
  • Bumped SUS-ITMX_L3_LOCK_BIAS_TRAMP to 25 from 30 during the transition to ETMX state, similar to what Sheila did on Nov 22. The hope was to move faster to a safer place and avoid the CHARD P ringup.

We've now had two lock losses from the Transition from ETMX state or immediately after while trying to reacquire. Unlike back on Nov 22 (alog81430), SRCL seems fine. For the first one, the locklost tool 1417133960 shows the IMC-SERVO_SPLITMON channel is saturating ~5sec before lock loss, then there is some odd LSC signals 40msecs before the tool tagged the lock loss (attachment 1). This might just be the lock loss itself though. The second one (locklost tool 1417136668) hasn't tagged anything yet, but ETMY has a glitch 2.5 sec before lock loss and ETMX seems to move more from that point (attachment 2).