Nico and Ed have the IFO back up to Nom Low Noise.  Calibration sweeps are currently running.

Daniel, Fil, Nutsinee

FEMTO LCA-S-400K-SI-FST was installed today (replace the unamplified Thorlabs diode that was in place). The following changes has been implemented on the concentrator board 7. Here's the transfer function.

The response of the diode has also been measured (falls off at ~400kHz as advertised).

Nutsinee Daniel

Asymmetric limits have been added to the green power servo to allow for lower power but limit the injected power to 20mW.

A new photodetector, Femto LCA-S-400K-SI-FST, has been installed in the OPO transmitted path.

The screenshot shows the updated servo screen.

Plot 1 shows the transfer function of this servo using the OPO reflected power (blue) and the OPO transmitted power (red).

Plot 2 shows the spectra of the OPO transmitted and reflected powers for servo off & optimized PDH offset (green), old PDH offset (blue), servo on using the transmitted power (brown), using reflected power (red) and the dark noise (black).

Plot 3 shows the coherence.

Richard Fil Ed Daniel

All VCOs and FDDs were equipped with the piggy-back board, which implements a relay to the power off the 1-GHz VCO, the RF dividers and the RF amplifiers. This required updated slow controls code and screens. There is a new button on the medm screen that turns on and off these RF parts. This replaces the excitation enable button which is now only available in hardware. So, there is still a readback of the state of the excitation switch. There are also new readbacks of the power state for VCO and FDD sections (corresponds to the two front panel power switches).

All VCO/FDD chassis have been upgraded in place with the exception of the squeezer VCO (s/n S1200565) which has been replaced with the spare (s/n S1700242).

Per work permit 8142  we removed the 8 VCOs on site and added ckt board D1900056 to the chasis.  This is a switch that allows them to be turned off remotely. https://dcc.ligo.org/DocDB/0159/D1900056/001/D1900056-v1.pdf..  Reinstalled the units and Daniel tested the software to make sure the switches worked.

    Laser Status:
    Front End Power is 31.67W (should be around 30 W)
    70W Output Power is 70.37W
    Front End Watch is GREEN
    70W Watch is GREEN

    PMC:
    It has been locked 0 days, 0 hr 0 minutes (should be days/weeks)
    Reflected power = 9.829Watts
    Transmitted power = 54.48Watts
    PowerSum = 64.31Watts.

    FSS:
    It has been locked for 0 days 0 hr and 0 min (should be days/weeks)
    TPD[V] = 3.516V (min 0.9V)

    ISS:
    The diffracted power is around 2.1%
    Last saturation event was 0 days 0 hours and 5 minutes ago (should be days/weeks)

    Possible Issues:  This looks good, up time is reflecting the end of Maintenance.

Both buildings were swept per the Sweep wiki/document.

WP8118 DAQ switch upgrade

Dave:

At EY I removed the old netgear switch and mounted the new Brocade switch in its place (last week I had installed the Brocade temporarily, resting on top of the Netgear). This took longer than anticipated due to inaccessible screws severely torqued down.

I have some more data points on what happens to DAQ data when an end station is shutdown. Last week powering off the netgear caused all FECs on h1dc0-card1 to go bad (both end stations, and most of corner ISC). This morning I tried just disconnecting a single front end (h1iscey) from the switch, again this hosed everything on h1dc0-card1. So I gave up trying to nicely and slowly remove FECs and powered down the EY switch, this time only EY went bad, as originally expected. I'm not sure why this behavior is inconsistent.

fmcs-epics-cds upgrade/reboot

Carlos:

The FMCS EPICS IOC machine fmcs-epics-cds was rebooted. The code did not automatically restart. I stopped the alarms, restarted the FMCS IOC and restored the alarms. The IOC was burt restored to 7am.

WP8141 h1sqz model change

Nutsinee, Daniel:

a new h1sqz model was installed. DAQ restart was required.

WP8137 remove PSL-DBB Jitter IPC from h1lsc

Dave:

I installed a new h1lsc model, removing the Dolphin IPC receiver for the PSL-DBB Jitter signal (which has been unavailable since mid-2018 when the Dolphin card was removed from h1psl0). This has greened up the IPC status, allowing me to show it again on the CDS overview. DAQ restart was required.

DMT Nat router upgrade

Carlos, Ryan, Dan:

A new nat router was installed for marble in place of the aging X2200 which was showing a failure LED. The original 10G SFPs did not work in the new hardware, and downgrading the SFP to various types of 1GB was unsuccessful. The original X2200 was put back into place for now. It is no longer showing a failure LED.

Beckhoff upgrades

Daniel, Dave:

Daniel installed new Beckhoff code, resulting in new DAQ-INI files for C1PLC[2,4], Y1PLC[1,2], X1PLC2. DAQ restart was required.

Some of the Beckhoff SDF faux-models were unresponsive, I restarted them all on h1ecatmon0. For each new channel which was not initialized, I (ACCEPT+MONITOR)'ed them.

Not Done This Week:

Ran out of time due to unexpected difficulties meant that external EDCU, DMT cable cleanup and EX switch upgrade will be deferred to next maintenance or TOO.

Maintenance activities ended around 12:30, a few of the items have been deferred.

Going through initial alignment now.

Pep Covas, T. Shaffer

Started the HIGH_FREQ_LINES Guardian node to sweep H1:CAL-PCALX_PACALOSC1_OSC_FREQ from starting frequency to 2000Hz by 500Hz steps. The steps will happen every 12 hours, but it will wait until we are not locked to change the frequency, so it could be longer than the 12.

Line amp = 35000

Starting freq = 5950.0Hz

Step size = 500Hz

FRS8295 Closed

After a myriad of minor issues for the past ~5 Tuesdays, I finally have the new RTD working.

I've restarted the FMCS-EPICS IOC and burt restored to 07:00 PDT. There should be no further alarms.

Sheila, JeffK, Betsy

With the IFO set to Down after a fresh lockloss, we tackled setting the SAFE SDF files across all SUS, LSC, ASC, etc files (in prep for lsc, tcs, sqz, guardian to all be restarted this am).  We generally accepted all things that guardian had newly set this morning, accepted all new Damping matrices settings, reverted some A2L settings from an errant script run over the weekend, and Sheila hand accepted/reverted a handful of things that were not well logged but that she thought seemed appropriate.

We found new ETMY_M0_TEST_OFFSETS changed Feb 13, but not logged.  We decided to leave them, but are unsure of where they came from.  See snapshot.

Once IMC setting files were sorted, Jeff set the IMC to OFFLINE for the VCO cards to be pulled (scheduled maint item).

I accidentally ACCEPTED 3 settings on the HAM2 ISI OBSERVE file, so those will pop back up in OBSERVE and will need ACCEPTING to get them back to the correct state.

We ignored all Beckhoff SDF files since Daniel had already started work on them and didn't want us changing the files.

Craig, Georgia, Nutsinee

It seems like we have non-linear coupling from CLF to DARM. The coherence plot wasn't very obvious but we clearly saw out injection showed up everywhere in DARM as we swept. Lockloss before we could inject more squeezing measurement (it's not the squeezer!).

Given that H1 is still in commissioning mode, I hesitate to report on lines that may be due to ongoing work, but I'm seeing a very strong 1-Hz comb in DARM as of last Wednesday, which I suspect is unintended. Below are spectra of 20-120 Hz and its 20-Hz sub-bands from yesterday's data (typical of daily spectra since Wednesday). 

Note that the lines are on exact 1-Hz multiples (to ~0.5 mHz resolution), but they have flat shoulders of O(0.01 Hz) full width. An arbitrary but typical example at 34 Hz is shown.

Also, the amplitudes of the lines do not fall entirely monotonically with frequency. There are clusters of lines with a spacing of roughly 7-8 Hz.

Any ideas on what changed, perhaps during the last Tuesday maintenance?