New RIN and SUM channel for ASC-OMC_A and B

New RIN filter modules have been added to the ASC-OMC_A and ASC-OMC_B QPDs. The calculation divides the SUM input by the SUM output. The SUM filter modules by default load a 1 Hz 2nd-order Butterworth low pass.

New filters:

• H1:ASC-OMC_A_RIN
• H1:ASC-OMC_B_RIN

New frontend channels:

• H1:ASC-OMC_A_RIN_OUT (testpoint)
• H1:ASC-OMC_B_RIN_OUT (testpoint)
• H1:ASC-OMC_RIN_OUT_DQ (DAQ, sum of above 2 channels)
• H1:ASC-OMC_NSUM_OUT (testpoint, sum of the 2 NSUM channels)

Replaced GV18's annulus ion pump

I forgot to attach a label indicating the date of pump replacement -> will do this at the next opportunity. Also, I had started the instrument air compressor for use with the pump cart's pneumatic isolation valve but didn't de-energize this until after 1400 hrs. local.  The Y-end instrument air pressure will decay slowly and will remain "RED" until pressure falls below ??? threshold.   Operators please ignore the "RED" MEDM field. 

ETM charge measurements from today

Patrick did the charge measurements today for the ETMX and ETMY. Later, Betsy and myself made the Matlab plots of the same (shown below). The data shows some excess noise for today's measurement. According to Patrick, he observed some noise in the OPLEV, hence we will do the measurements tomorrow once again. There were lots of activity at the end station today, hence this could also be one of the reason for excess noise.

Shift Summary - Day

TITLE: 01/22 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
INCOMING OPERATOR: None
SHIFT SUMMARY: Maintenance day
LOG:

15:15 Chris chewing tumbleweeds- X&Y

16:12 Kyle out to EY - GV18 work

16:32 Norco onsite - Dewar #77 (X-Mid)

16:33 Niko, Rick and Dimitri out to EX for PCal work

16:40 TVo and Daniel out to HAM5 to align the SRM heater/laser

16:51 Fil out to EX to install patch panel on VEA rack.

16:42 Vanessa to LVEA

16:56 Cheryl and Kara out to LVEA - HAM2

17:01 Peter out to Optics lab

17:10 TJ out to LVEA to join TVo and Daniel

17:14 Corey out to tend TCS chillers

17:23 Corey back

17:30 TCS team back

17:37 Karen out to EY

17:41 Travis out to EY to check status of work platform on BSC- PEM coupling

18:05 Travis back

18:11 PCal called - another 30 minutes should do it

18:14 Norco on site - Dewar #80 (EX)

18:25 Nutsinee out to ISCT6 - no IMC lock please

18:38 Peter back

18:50 PCal finished - EX is LASER safe

19:36 Dick out to CER for RF measurements

20:17 Chandra out to EY

20:18 Nutsinee back

20:20 Fil back

20:21 Kyle back from EY

21:12 Cheryl out to the LVEA

21:20 FIl out to LVEA

21:21 Peter out to Optics Lab

21:40 Cheryl need to re-align her camera on HAM2 while Patrick finishes the charge measurements

22:10 DAQ restart

22:25 IA started

22:26 Nutsinee out to ISCT6

23:21 it seems that approx 21:10 PRM sliders were moved to radically different positions. The cause is unknown.

23:48 Glitching in ALS slowing things down

 

HAM2 camera

Installed the zoom lens, and got a good focus on the 2" REFL steering mirror, but once the enclosure was shut, the camera shifted, and once I revisited the camera/enclosure, the focus was not easy to re-find, so I looked at all available options, and ended up reinstalling the original lens, stopping down the aperture, and focusing on the IR light that's visible on the DKDP, which I'll use to evaluate the alignment of the output of the IO Faraday.

Upgraded imaged attached show the DKDP with the illuminator on, and the same optic with the illuminator off.

- Kara, Cheryl

EtherCAT software updates

A couple of smaller fixes:

• Fixed the save/restore for some of the whitening channels in the squeezer (copy paste error).
• Removed the whitening channels for SQZ-OPO_IR_PD (don't exist).
• Added ALS frequency channels which use the beat note readbacks rather than the VCO readbacks.

Updating IM4 & MC2 Trans calibration

Both of these QPDs acquired an NSUM channel. The medm screens reached from the IMC overview have been updated to also include the whitening.

The calibration is now according to alog 46482. The segments are in mW, whereas the new NSUM channels is in W incident to the mirror.

The IMC trigger had to be adjusted to account for the change in the MC2 TRANS SUM.

Updated IM4 Trans NSUM calibration to be input power W:
IM4 Trans NSUM Out = True Input Power [W] = IM4 Trans NSUM In [mW] * R_IM4/(T_IM4 * 0.1) * 1e-3 = IM4 Trans NSUM In [mW] * 4.157 [W/mW]
T_IM4 (aka T_SM2) is 2400 ppm.

State of the faster guardian machine

The new h1guardian1 machine has been running for a week now. Here are the latest statistics.

Network errors vs front-end restarts

Here is a trend of the ethernet errors (10 minute sample, baseline Rx Overruns=1048) referenced to this morning's front end and DAQ restarts

Tue Jan 22 11:29:34 PST 2019
        RX errors 0  dropped 0  overruns 1048  frame 0
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
Tue Jan 22 11:39:34 PST 2019
        RX errors 0  dropped 0  overruns 3890  frame 0
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
Tue Jan 22 11:49:34 PST 2019
        RX errors 0  dropped 0  overruns 4461  frame 0
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
Tue Jan 22 11:59:34 PST 2019
        RX errors 0  dropped 0  overruns 4461  frame 0
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
Tue Jan 22 12:09:34 PST 2019
        RX errors 0  dropped 0  overruns 4461  frame 0
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
Tue Jan 22 12:19:34 PST 2019
        RX errors 0  dropped 0  overruns 4461  frame 0
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Restarts:

• 2019_01_22 11:35 h1pemcs
• 2019_01_22 11:35 h1seiproc
• 2019_01_22 11:35 h1tcscs
• 2019_01_22 11:36 h1lsc
• 2019_01_22 11:36 h1omc
• 2019_01_22 11:38 h1ascimc
• 2019_01_22 11:38 h1asc
• 2019_01_22 11:40 h1alsex
• 2019_01_22 11:40 h1iscex
• 2019_01_22 11:40 h1pemex
• 2019_01_22 11:42 h1alsey
• 2019_01_22 11:42 h1iscey
• 2019_01_22 11:42 h1pemey
• 2019_01_22 11:43 h1broadcast0
• 2019_01_22 11:43 h1dc0
• 2019_01_22 11:43 h1fw0
• 2019_01_22 11:43 h1fw1
• 2019_01_22 11:43 h1fw2
• 2019_01_22 11:43 h1nds0
• 2019_01_22 11:43 h1nds1
• 2019_01_22 11:43 h1tw0
• 2019_01_22 11:43 h1tw1

CPU/core usage:

See attachment for today's htop listing, compare with htop from last week

More GDS channels which no longer exist

During this morning's DAQ restart the following channels were removed from the GDS_DMT broadcaster because they no longer exist:

• H1:ASC-ODC_CHANNEL_OUT_DQ
• H1:CAL-PCALX_FPGA_DTONE_IN1_DQ
• H1:CAL-PCALX_IRIGB_OUT_DQ
• H1:CAL-PCALY_FPGA_DTONE_IN1_DQ
• H1:CAL-PCALY_IRIGB_OUT_DQ
• H1:ISI-GND_STS_EYBURIED_X_DQ
• H1:ISI-GND_STS_EYBURIED_Y_DQ
• H1:ISI-GND_STS_EYBURIED_Z_DQ

Following today's changes there are further channels being 'sent' to GDS which no longer exist. Someone from the GDS/DMT group should verify that these channels are not used by GDS monitors, and perhaps look to see if any other channels should be removed from or added to the broadcaster.

• H1:ALS-Y_ODC_CHANNEL_OUT_DQ
• H1:IMC-ODC_CHANNEL_OUT_DQ
• H1:LSC-ODC_CHANNEL_OUT_DQ
• H1:OMC-ODC_CHANNEL_OUT_DQ
• H1:TCS-ODC_CHANNEL_OUT_DQ

I will removed these from H1BRAOADCAST0.ini and this change will go into effect on the next DAQ restart.

Hepi Pump Trends - Monthly FAMIS# 8058

PSL Status Report - Weekly FAMIS# 10996

Laser Status:
Front End Power is 32.22W (should be around 30 W)
70W Output Power is 70.5W
Front End Watch is GREEN
70W Watch is GREEN

Laser Status:
Front End Power is 32.22W (should be around 30 W)
70W Output Power is 70.5W
Front End Watch is GREEN
70W Watch is GREEN

PMC:
It has been locked 5 days, 2 hr 55 minutes (should be days/weeks)
Reflected power = 10.53Watts
Transmitted power = 54.47Watts
PowerSum = 65.0Watts.

FSS:
It has been locked for 0 days 1 hr and 34 min (should be days/weeks)
TPD[V] = 3.202V (min 0.9V)

ISS:
The diffracted power is around 2.3%
Last saturation event was 0 days 3 hours and 57 minutes ago (should be days/weeks)

Possible Issues:

Optical Levers Inspection FAMIS# 11201

Centering on the OpLevs looks to be fine. The usual cast of characters still needing attention with no backups for relief. Images of Centering below as well as the ever noisy ITMX OpLev and slightly glitchy ETMY.

PSL Weekly Report - 10 Day Trends FAMIS #10593

Further RIN investigations

Koji, Craig

Tonight we investigated intensity noise further.  We locked the OMC on just the 45 MHz at 30 watts with 18 dB whitening gain, and then locked it on carrier at 20 W with 0 dB whitening gain.  This is a repeat of here.

We found that carrier and 45 MHz noise levels are similar.  (See attachment one, carrier RIN is Blue, 45 MHz RIN is Brown)

We were confused about why 100 and 1000 Hz the carrier noise is lower.  We believe that this is mostly a shot noise effect.  
For 45 MHz we have 0.5 mA on the OMC DCPDs, while for carrier we had 34.3 mA.  This corresponds to RIN shot noise levels of 2.5 × 10-8 1/rtHz and 3.1 × 10-9 1/rtHz.
- The carrier is mostly limited by the ISS second loop sensing noise, as seen from the green curve in attachment one.  
- The 45 MHz flattens out right around our shot noise limit around 100 Hz.
- Both carrier and 45 MHz have similar RIN spectra below 100 Hz.

Recap:
We know that the 9 MHz modulation depth has a real effect on the DARM noise, seen here as well.  During the holiday party we were able to improve DARM noise by increasing the DARM offset, which could be due to increased carrier drowning out the 9 MHz noise.
We also know that our OMC measured RIN in the sidebands cannot be explained from the noise in our RF AM stabilization scheme, or the ISS.
We are pretty sure that the IMC FSR is reasonably close to our 1f modulation frequency.

Conclusions:
We here note that our shot noise from the OMC sideband measurements is not good enough from 80 Hz onwards to be able to tell what our actual 45 MHz sideband RIN noise level is.  
Below 100 Hz, carrier and 45 MHz RIN seem to be limited by the same mechanism, we don't know what it is.  
9 MHz is not ever limited by shot noise in the OMC RIN measurement, and is overall worse than both carrier and 45 MHz RIN after 20 Hz, where it starts falling much more slowly. (Attachment three)

-------------------------------------------------------------------------------------------------------------

Past OMC carrier RIN measurement

Learned how to import in DTT.  Shown is carrier, 9 MHz, and 45 MHz together.

CHARD P, DHARD P swept sines

We took some CHARD, DHARD P measurements tonight, neither seem responsible for the 1 Hz oscillation reported earlier.
We lost lock due to a 6.4 earthquake five hours ago.

9 MHz RIN measurement

Jenne Sheila

Summary:

We measured the RIN on the 9 MHz sideband 00 mode through the OMC, and see that it is about a factor of 10 higher than the RIN predicted by the RF AM monitor.  

Details:

The first time I tried this measurement, we were limited by the OMC DCPD dark noise 46197.  These are the steps we followed this time:

• engage 3 whitening stages + 18dB whitening gain on OMC DCPDs, measure DCPD dark noise with IMC offline (18:51 UTC Jan 17)
• Lock IMC at 2 W, request guardian to ISS_ON (we have to engage ISS before powering up, but can't DC couple it until we are powered up, don't use ISS_AC_COUPLED state)
• increase power to 30W using Power guardain
• ISS DC coupled
• Align IFO for single bounce, engage AS centering loops, OMC ASC
• reduced 45MHz modulation depth to 3.3dBm on driver, increased 9 MHz to 27dBm
• turn off OMC whitening (no filters, 0dB gain), and reduce OMC length dither line to 0 to take OMC scans to identify 9MHz modes
• turn dither line and whitening back on, lock OMC on 9 MHz mode
• measurement with no excitation: 19:25 UTC
• enable excitation on EOM driver, measurement with excitation at 19:31:59 UTC

The OMC DCPD signals (and dark noise) are calibrated into RIN here taking into account the extra 18dB of whitening gain.  The EOM driver channel is normally calibrated into RIN assuming that the drive level is 17dBm according to Daniel, so this is divided by 3 because we are using 27dBm out of the EOM driver here. 

The measurement with the excitation on shows good agreement between the RF AM monitor and the measured amplitude noise, so these calibrations are OK.  We also have OK clearance above dark noise and the intensity noise seen by the ISS. So there is some additional source of intensity noise on the 9 MHz sidebands.  

 

initail ODC removal work

ODC removal (as per ECR 12045) has begun.  Summary:

• All ODC IPC senders were removed from all CS ISIs, HAM1 HPI, h1asc, h1iscey, h1caley front end models.
• All existing INJ logic was left in place, including the full INJ ODC monitoring path from h1calex -> h1iscex -> h1odcmaster (see subsequent log on INJ changes).
• All IPC receivers were removed from h1odcmaster, and all inputs were grounded, except the IPC receiver from h1iscex (see below).
• OBSERVATORY READY/INTENT/OBSERVE logic was removed from ODC.  This will be replaced by functionality in the guardian system (to be done).

Detailed front end changes:

• h1odcmaster: All IPC receivers were removed, and the corresponding inputs to the ODC MASTER block were grounded, EXCEPT the H1:ODC-X_CHANNEL_RFM IPC receiver from the X end (h1iscex).  All GRD EPICS channels were removed.  All OBSERVATION READY/INTENT logic was removed.  The primary H1:ODC-MASTER_CHANNEL_LATCH channel was left in place.
• h1iscey: All ODC blocks and related IPC senders/receivers were removed.
• h1iscex: All ODC-related IPC senders/receivers were removed, and the corresponding inputs to the ODC block were grounded, EXCEPT the  H1:CAL-X_ODC_SHMEM IPC receiver from h1calex.
• h1caley: The PINJY block was completely removed, including all PINJY ODC logic.  The IPC SHMEM sender to h1iscey was also removed.  A new IPC RFM receiver from the h1calinj model was added (see subsequent log about INJ changes).
• h1asc: All ODC blocks and related IPC senders were removed (see subsequent log about ASC model changes).
• SEI: All ODC-related IPC senders were removed from all corner station ISI models, and the HAM1 HPI model (see subsequent log about SEI model changes)

Further removal of ODC from the rest of the system (ISC, SUS, PEM, etc.) is deferred to later maintenance. 

Keita and Rahul

Keita showed me how to make changes to the front end model of SUS. We made changes to MC_MASTER library parts to remove ODC. We complied h1susmc2 successfully, however we didn't install it. 

Anemometer lowered at EndX Wind Fence

Back in Sept, the locations of the anemometers up by the EndX wind fence were shown on a sketch.  Today ChrisS help move the Wind_Speed_3 sensor from 12' up to 2' AGL; the horizontal location is within a foot, coord +3,-9.  That height above ground level puts the sensor in the middle of the gap between the bottom of the wind cloth and the ground.  We want to study the wind profile as we move from in the middle behind the cloth to in the gap below the cloth.  We expect it to be higher than behind the cloth but is the velocity actually higher than the free stream wind (Wind_Speed_1)-is it accelerated?  So, we'll see.  Report later after we have some wind in the ~right direction.