 Wed May 16 21:02:22 2018, Kevin, Update, PEM, ADC common mode rejection with new seismometer connections 
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As described in this elog, the ADC for the seismometers now has the signals wired directly
to the ADC instead of going through an AA board or other circuit to remove any common mode noise. This
elog describes one test of the common mode rejection of this setup. Guantanamo suggested comparing directly with a recent spectrum taken a few months |
 Wed May 16 21:47:17 2018, Kevin, Update, PEM, Seismometer Noise Spectra
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Earlier today Kira and I reconnected the EX seismometer. I just took some spectra of all three seismometers, shown in the attachments, to compare with
past data and to do a rough check of the calibration.
This elog has a spectra from 2010 (GUR1 |
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Thu May 17 09:14:38 2018, Steve, Update, General, Stack measurement setup decommissioned
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The final set-up of stack measurment with 3 load cells and 4 leveling
wedge mounts as Atm 1
Sensor voltages BEFORE and AFTER this attempt. |
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Thu May 17 11:56:37 2018, gautam, Update, General, EPICS process died on c1ioo
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The EPICS process on the c1ioo front
end had died mysteriously. As a result, MC autolocker wasn't working, since the autolocker control variables are EPICS channels defined in the c1ioo model. I restarted the model, |
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Thu May 17 15:38:19 2018, Kira, Update, PEM, test setup with seismometer
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I've moved my setup to the actual seismometer. I attached the temperature sensor to the seismometer (attachment 1) with duct tape, though this is
temporary. I will be monitoring the temperature fluctuations of the seismometer for a whole day then take the can off and repeat the test. The can isn't
clamped down so the insulation isn't perfect, so I'd expect to see some noticeable fluctuations even with the can on. I've also labeled the |
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Thu May 17 18:05:01 2018, gautam, Update, SUS, SR785 near 1X5
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I'm working near 1X5 and there is an SR785 adjacent to the electronics rack with some cabling running along the floor. I plan to continue in the
evening so please leave the setup as is.
During the course of this work, I noticed the +15V Sorensen |
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Fri May 18 07:41:01 2018, steve, Update, SUS, clipping ITMX oplev
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The ITMX oplev still clipping
Quote:
The ITMX oplev beam is clipping. It will be corected with locked arm |
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Fri May 18 09:13:41 2018, Pooja, Update, SUS, Colored GigE image
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To obtain a colored version with good contrast of the grayscale image of scattering of light by dust particles on the surface of test mass, got using
GigE camera. The original and colored images are attached here.
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Fri May 18 14:33:34 2018, Kira, Update, PEM, test setup with seismometer
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Here is the result of my test. I think I'll leave the can on over the weekend because there's a long period of time where the seismometer heated
up by 0.8 degrees so I can't fully see the fluctuations over a full 24 hour period. |
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Fri May 18 19:10:48 2018, keerthana, Update, General, Code for adjusting the oscillator frequency remotly
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Target: Phase locking can be acheived by giving a scan to the oscilator frequency. This frequency is now controlled using the knobe
on the AM/FM signal generator 2023B. But we need to control it remotely by giving the inputs of start frequency, end frequency and the steps.
The frequency oscilator and the computer is connected with the help of GPIB Ethernet converter. The IP address of the converter I used is '192.168.113.109' |
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Fri May 18 20:03:14 2018, Pooja, Update, Cameras, Telescopic lens solution for GigE 8x
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Aim: To find telescopic lens solution to image test mass onto the sensor of GigE camera.
I wrote a python code to find an appropriate combination of lenses to focus the optic onto the camera keeping in mind practical constraints like
distance of GigE camera from the optic ~ 1m and distance between the lenses need to be in accordance with the Thorlab lens tubes available. We have to |
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Sun May 20 17:43:01 2018, rana, Update, Electronics, How to choose resistors
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Article from EE Times, describing
why metal foil (NOT metal film) resistors are really better than wirewound when it comes to everything except high power dissipation.
Need to do some diggin to see if we can find ~1k metal foil resistors which can handle ~1W of heat. |
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Sun May 20 23:43:50 2018, gautam, Update, IOO, Coil driver noise re-measurement
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Summary:
In the IMC actuation chain, it looks like the MC1/MC3 de-whitening boards, and also
all three MC optics' coil driver boards, are showing higher noise than expected from LISO modeling. One possible candidate is thick film |
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Mon May 21 10:15:35 2018, gautam, Update, PEM, test setup with seismometer
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I guess it's fine for now while we are still finalizing the setup at EX, but we should eventually line up the seismometer axes with the IFO axes.
Is there a photo of the orientation of the seismometer pre heater can tests? If not, probably good to make some sort of markings on the granite slab /
seismometer to allow easy lining up of these axes... |
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Mon May 21 14:17:28 2018, Kira, Update, PEM, test setup with seismometer
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I have attached the graph for the seismometer temperature fluctuations over 3 days. As we can see, there is a noticeable fluctuation in daily temperature
as well as a difference between days in the maximum and minimum temperatures. I will repeat this test but take the can off to see if there's any difference
between having the can on or off. |
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Mon May 21 17:36:00 2018, pooja, Update, Cameras, GigE camera image of ETMX
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Today Steve and I tried to to capture the image of scattering of light by dust particles on the surface of ETMX using GigE camera. The image ( at gain
=100, exposure time = 125000) obtained has been attached. Unlike the previous images, a creepy shape of bright spots was seen. Gautam helped us lock
infrared light and see the image. A similar less intense shape was seen. This may be because of the dust on the lens. |
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Mon May 21 18:02:55 2018, keerthana, Update, General, Testing of the new mini-circuits frequency counter
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Today, I tested the new mini-circuit frequency counter by connecting it with the beat signal output. The frequency counter works fine. Now I am trying
to get a display of the frequency in the computer screen using python programming. I have made the code for remotely changing oscilator frequency and it
is saved in the folder 'ksnair'. A picture of the new mini circuits frequency counter is attached below. Part no: UFC-6000, S/N: |
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Tue May 22 14:49:03 2018, Kira, Update, PEM, test setup with seismometer
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It appears that one of the wires was disconnected overnight or this morning so I wasn't able to gather data over a full 24 hour period. Perhaps someone
accidentally kicked it. I placed some cones in that area so hopefully the wires won't be in the way as much and I can get the data tomorrow. From the
data I do have it seems that the seismometer is at a colder temperature when the can is not on, though it is difficult to see by how many degrees the temperature |
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Tue May 22 17:26:25 2018, gautam, Update, IOO, MC1 Coil Driver pulled out
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I have pulled out MC1 coil driver board from its Eurocrate,
so IMC is unavailable until further notice. Plans:
Thick film --> Thin Film
AD797 --> Op27
Remove Pots in analog actuation path.
Measure noise
Route |
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Tue May 22 17:29:27 2018, keerthana, Update, elog, MEDM Diagram for the auxilary laser system control and display.
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(keerthana, gautam, jon)
In the morning, Jon gave me an overview of the Auxiliary laser system which we are planning to setup. Based on the diagram he uploaded in the
elog, I have made the MEDM diagram for controlling and displaying the parameters. Here the parameters which we will be controlling are temperature (in |
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Tue May 22 23:28:01 2018, gautam, Update, IOO, MC1 Coil Driver pulled out
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This work is now complete. MC1 coil driver board has been reinstalled,
local damping of MC1 restored, and IMC has been locked. Detailed report + photos to follow, but measurement of the noise (for one channel)
on the electronics workbench shows a broadband noise level of 5nV/rtHz ( |
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Wed May 23 14:50:33 2018, Kira, Update, PEM, test setup with seismometer
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This time the test went without issue. The first attachment is the data for the past 24 hours and the second attachment is the full data over 6 days.
The average temperature fluctuations (from highest point to lowest point) for the can on was 0.43 C and for the can off it came out to 0.55 C. In addition
the seismometer with the can off is about 1 C cooler than with the can on. I'd like to leave the can off until the end of the week so we can get a |
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Wed May 23 17:58:48 2018, gautam, Update, IOO, MC1 Coil Driver pulled out
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Marked up schematic + photo post changes uploaded to DCC page.
There was a capacitor
in the DAQ monitor path making a 8kHz corner that I now removed (since the main point of this front panel HPF monitor point is to facilitate easy coil
driver noise debugging, and I wanted to be able to use the SR785 out to high frequencies without accounting for an additional low pass). Transfer function |
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Thu May 24 10:16:29 2018, gautam, Update, General, All models on c1lsc frontend crashed
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All models on the c1lsc
front end were dead. Looking at slow trend data, looks like this happened ~6hours ago. I rebooted c1lsc and now all models are back up and running to their
"nominal state". |
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Thu May 24 15:18:12 2018, Kira, Update, PEM, PID loop restarted
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Rana said that it wasn't necessary to gather more data on the temperature fluctuations so I have reconnected the heater circuit and restarted the
PID loop with the can on the seismometer. |
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Thu May 24 16:08:12 2018, Kira, Update, PEM, parts list
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We will need to order a few things for our final setup.
1U box to place the heater circuit and temperature circuits in. The minimum depth that will fit all the electronics is 10 inches
according to my sketch.
I found two possibilities online for this. I don't know exactly what our budget is, but this |
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Fri May 25 14:55:33 2018, Jon Richardson, Update, Cameras, Status of GigE Camera Software Fixes
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There is an effort to switch to an all-digital system for the GigE camera feeds similar to the one running at LLO, which uses Joe Betzwieser's
custom SnapPy package to interface with the cameras in Python and aggregate their feeds into a fancy GUI. Joe's code is a SWIG-wrapping of
the commercial camera-driver API, Pylon, from Basler. The wrapping allows the low-level camera driver methods to be called from within Python, and |
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Tue May 29 16:22:43 2018, Kira, Update, PEM, parts list
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I've updated the parts list to be an excel document and included every single part we will need. This is ony a first draft so it will probably
be updated in the future. I also made a mistake in hole sizing for the front panel so I've updated it and attached it as well (second attachment).
Edit: re-attached the EX can panel fpd file so that everything is in one place |
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Tue May 29 16:33:04 2018, Steve, Update, PEM, air cond filters replaced
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Chris replaced some air condition filters and ordered some replacement filter today.
Quote:
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Wed May 30 10:17:46 2018, gautam, Update, IOO, MC1 Coil Driver pulled out
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[rana,gautam]
Summary:
Last night, Rana fact-checked my story about the coil driver noise measurement. Conclusions: |
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Wed May 30 12:13:13 2018, rana, Update, Computers, NODUS: rsyncd + frames
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To get our rsync back to LDAS back up, I followed instructions from Dan Kozak:
mounted /frames from fb1: I modified /etc/fstab
modified /etc/rsyncd.conf to allow access from LDAS
restarted |
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Wed May 30 23:57:08 2018, gautam, Update, PEM, Burning smell in office area / control room
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[koji, gautam]
We noticed quite a strong burning smell in the office area and control room ~20mins ago. We did a round of the bake lab, 40m VEA and the perimeter
of the CES building, and saw nothing burning. But the smell persists inside the office area/control room (although it may be getting less noticeable). |
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Thu May 31 02:04:55 2018, johannes, Update, PSL, AUX laser state of mind
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The AUX laser is down to 5.4 mW output power
What's worse, because we wanted those fast switching times by the AOM for ringdowns, I made the beam really small, which |
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Thu May 31 10:19:42 2018, gautam, Update, SUS, MC3 glitchy
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Seems like as a result of my recent poking around at 1X6, MC3 is more glitchy than usual (I've noticed that the IMC lock duty cycle seems degraded
since Tuesday). I'll try the usual cable squishing voodo.
gautam 8.15pm: Glitches persisted despite my usual cable squishing. I've left PSL shutter closed and MC watchdog |
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Thu May 31 15:36:59 2018, gautam, Update, General, New camera channels
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Jon informed me that there are some EPICS channels that JoeB's camera server code looks for that don't exist. I thought Jigyasa and I had added
everything last year but turned out not to be the case. I followed my instructions from here,
did the trick. While cleaning up, I also re-named the "*MC1" channels to "*ETMX", since that's where the camera now resides. New |
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Thu May 31 15:48:16 2018, Kira, Update, PEM, running PID script with seismometer
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I have attached the result of running the PID script on the seismometer with the can on. The daily fluctuations are no more than 0.07 degrees off from
the setpoint of 39 degrees. Not really sure what happened in the past day to cause the strange behavior. It seems to have returned back to normal today. |
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Thu May 31 17:47:12 2018, Koji, Update, Computers, megatron process cleaning up
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megatron had full of zombie medm processes due to some of the screenshot scripts.
I also found that apache2 is running on megatron without any configuration. I just disable it by
sudo update- |
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Thu May 31 19:51:06 2018, Koji, Update, General, WiFi router firmware update / rebooting
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The model of our martian wifi router (NETGEAR R6400) was found in the FBI router list to be rebooted asociated with the malware "VPNFilter"
issue.
I checked the attached devices and found bunch of (legit) devices blocked to access the wifi router. This is not an immediate problem as most |
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Thu May 31 23:12:17 2018, gautam, Update, LSC, DRMI locking attempt
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Summary:
I wanted to recover the DRMI locking. Among other things, Jon mentioned that his mode spectroscopy can be done in the DRMI config. But I was
foiled last night by a rogue waveplate in the AS beampath, and today evening, I noticed the resurfacing of this |
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Fri Jun 1 01:22:50 2018, gautam, Update, LSC, DRMI locking restored
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As it happened last time, the problem apparently fixed itself - somehow the act of me disconnecting the cables and reconnecting them seems to solve the
problem, need to think about this.
Anyway, DRMI was locked a few times tonight |
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Fri Jun 1 19:25:11 2018, pooja, Update, Cameras, Synchronizing video data with the applied motion to the mirror
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Aim: To synchronize data from the captured video and the signal applied to ETMX
In order to correlate the intensity fluctuations of the scattered light with the motion of the test mass, we are planning to use the technique
of neural network. For this, we need a synchronised video of scattered light with the signal applied to the test mass. Gautam helped me capture 60sec video |
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Sun Jun 3 22:48:59 2018, johannes, Update, PSL, aux laser replacement
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I brought the NPRO from the Crackle experiment over to the 40m Lab and set it up on the PSL table to replace the slowly dying AUX laser. I also brought
along a Faraday isolator, broadband EOM, and an ISOMET AOM with driver electronics from the optics storage in the Crackle Lab.
This laser is a much newer model, made in 2008, and still has all its mojo, but we should probably keep up the practice of turning it off when |
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Mon Jun 4 02:52:52 2018, johannes, Update, PSL, aux laser replacement
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> While the laser output is going strong, the controller displays a power output of only 10 mW, which makes me think that the power monitoring PD
is busted.
NPRO internal power monitor often shows smaller value than the actual due to a broken PD or misalignment. I don't think we need to fix it. |
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Mon Jun 4 11:00:37 2018, gautam, Update, PSL, aux laser replacement
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Quote:
I couldn't locate an appropriate heat sink for the driver, which is still in factory condiction, but since
the PSL AOM also runs on 80MHz I used that one instead. |
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Mon Jun 4 11:34:05 2018, Jon Richardson, Update, Cameras, Update on GigE Cameras
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I spent a day trying to modify Joe B.'s LLO camera client-server code without ultimate success. His codes now runs without throwing any
errors, but something inside the black-box handoff of his camera source code to gstreamer appears to be SILENTLY FAILING. Gautam suggested a call
with Joe B., which I think is worth a try. |
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Mon Jun 4 19:41:01 2018, keerthana, Update, , Finesse code for cavity scan
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The cavity scan data obtained from the Finesse simulation is attached here. Fig1 indicates the cavity scan data in the absence of induced misalignment.
In that case only the fundemental mode is resonating. But when a misalignment is induced, higher order modes are also present as seen in Fig2. This is
in the absence of surface figure error in the mirrors. Now I am trying to provide perturbations to the mirror surface in the form of zernike polynomials |
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Tue Jun 5 02:06:59 2018, gautam, Update, PSL, aux laser first (NULL) results
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[johannes, gautam]
Johannes aligned the single bounce off the ITM into the AUX fiber on the AS table, and also the AUX beam into the fiber on the PSL table.
Mode
matching isn't spectaular anywhere in this chain.
But we have 2.6mW of light going into the SRM with the AOM deflection into the 1st order |
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Tue Jun 5 20:31:42 2018, rana, Update, Cameras, Update on GigE Cameras
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Aha! Video is back!
I think it would be good to add a flag whereby the video can be saved to disk in some uncompressed video format (ogg, avi, ?) instead of displayed
to a matplotlib window. We could then use the default to just display video, but use the save-to-disk flag to grab a few minutes of video for image processing. |
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Wed Jun 6 10:02:52 2018, Steve, Update, VAC, RGA scan
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Wed Jun 6 10:44:52 2018, gautam, Update, VAC, Annulus pressure channels added to frames
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[steve, gautam]
We added the following channels to C0EDCU.ini and restarted the daqd processes. Channels seem to have been added successfully, we will check
trend writing later today. Motivation is to have a long term record of annulus pressure (even though we are not currently pumping on the annulus). |