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ID Date Authorup Type Category Subject
  12928   Tue Apr 4 17:27:58 2017 ranaUpdatePSLPSL NPRO PZT calibration

good cal. I wonder if this data also gives us a good measurement of the cavity pole or if the photo-thermal self-locking effect ruins it. You should look at the data for the positive sweeps and negative sweeps and see if they give the same answer for the cavity poles. Also, maybe we can estimate the PMC cavity pole using the sidebands as well as the carrier and see if they give the same answer? 

  12934   Mon Apr 10 14:21:57 2017 ranaUpdateOptical Leversoplev laser RIN test planning

I'm suspicious of this temperature sensor comparison. Usually, what they mean by accuracy is not the same as what we mean. I would not buy these yet. How about we just use what Caryn used several years ago (elog search) ?

  PS  Steve LM34             

  12935   Mon Apr 10 15:22:46 2017 ranaConfigurationWikiDokuWikis are back up

AIC Wiki updated to latest stable version of DokuWiki: 2017-02-19b "Frusterick Manners" + CAPTCHA + Upgrade + Gallery PlugIns

  12942   Thu Apr 13 19:54:07 2017 ranaUpdateDAQcheckup on minute trends

Our minute trends are still not available through NDS2 from the outside world due to the bad config of the DAQ, but I can confirm that we still have the minute-raw capability. This is 111 days of Seismic BLRMS.

However, it seems we're only able to get ~1 week of lookback on our second trendssadno and that is low-down dirty shame. We used to have over a month of second trend lookback before the last decade of 'upgrades'.

Attachment 1: BRLMS-trend.png
  12943   Thu Apr 13 21:01:20 2017 ranaConfigurationComputersLG UltraWide on Rossa

we installed a new curved 34" doublewide monitor on Rossa, but it seems like it has a defective dead pixel region in it. Unless it heals itself by morning, we should return it to Amazon. Please don't throw out he packing materials.

Steve 8am next morning: it is still bad The monitor is cracked. It got kicked while traveling. It's box is damaged the same place.

Shipped back 4-17-2017

Attachment 1: LG34c.jpg
Attachment 2: crack.jpg
  12946   Tue Apr 18 23:37:15 2017 ranaUpdatePSLPMC OLTF measured, DAQ channels calibrated

What's the reasoning behind setting the the gain to this new value? i.e. why do these 'margins' determine what the gain should be?

  12955   Fri Apr 28 13:56:26 2017 ranaUpdateGeneralDRMI locking

one of these signals does not look like the others: explanation?

  12959   Sun Apr 30 13:24:00 2017 ranaUpdateCamerasAttempting to Load Camera Client

We ought to put the camera software on the shared disk; I don't think there's any speed reasons that it needs to be local.

Its OK to use optimus as the camera server for testing at the moment, but once we have things running, we'll install a few more cameras. With ~4-5 GigE running, we may not want to share with optimus, since we're also using it for comsol and skymap calculations.

  12969   Wed May 3 18:45:45 2017 ranaUpdateGeneralDRMI locking

Comparing counts doesn't get you anywhere; each PD has different whitening gain which may vary from measurement to measurement. The better thing to compare is Volts coming out of the demod board, since this (hopefully) only changes when we touch the PD or analog signal chain; this is what I used for the most recent DRMI sensing measurements. (ELOG 11589) We have calibrated actuator channels in the CAL model, which will give you the control signal in m for the DRMI lengths. Perhaps you can convert your sensing matrix measurement to demod board output volts per meter to compare with the last measurement.

Also, the monitor ports are the LEMO ports to the left; the SMA ports where the signal is coming from are from a daughter board that has a better output opamp that the nominal output; we're using the same output on the REFL11 and AS55 demod boards.

Wrong! RTFS.

SMA outputs are the bare, passive outputs of the mixer/lowpass.
TNC outputs are the low-noise, acti amplified outputs via the daughter board.
LEMO outputs are the high noise, G=2, LT1125 buffered outputs
  12971   Thu May 4 09:52:43 2017 ranaConfigurationComputerscatastrophic multiple monitor failures

That's a new failure mode. Probably we can't trust the power to be safe anymore.

Need Steve to order a couple of surge suppressing power strips for the monitors. The computers are already on the UPS, so they don't need it.

  12976   Sat May 6 21:52:11 2017 ranaUpdateGeneralMICH NB questions

I think the most important next two items to budget are the optical lever noise, and the coil driver noise. The coil driver noise is dominated at the moment by the DAC noise since we're operating with the dewhitening filters turned off.

  12977   Mon May 8 21:53:56 2017 ranaSummarySEIattempt to get seismic BLRMS minute trend

I tried to get some minute trend data today, but was unable to get it from inside or outside the control room using our matlab or python tools.

It seems the NDS2 interface will not work anywhere since it needs our minute trends to be written as frames; in the last version that Jamie left us, our minute trend frame files are not being written since they lead to periodic daqd crashes.

From inside the control room, we can get the minute trend (only with DataViewer). I've attached 30 days of BS_X just to show its real.

We can get the numerical data from the Grace plot window using the menu option Data->Export->ASCII.

You must select all of the 'Write Sets' to get all of the traces in the plot window. The resulting ascii file is not in a great format, but its not terrible.

Attachment 1: BLRMS_trend.png
  12981   Wed May 10 16:53:38 2017 ranaUpdateGeneralMICH NB - OL coupling

That's a good find.

  1. The OL control signal can be gotten from the DQ error signal. You just need to multiply it by the digital filters and the gain. The state of the filters and the gain can be gotten using matlab tools like getFotonFilt.m. For python ChrisW wrote a tool called foton.py which is in the GDS SVN. You should ask him for it. It requires access to some ROOT libraries to run.
  2. We should have sub budgets for everything like OL and thermal, etc. They should be automatically produced each time you run the main budget and should be separate pages in the same PDF file. Jamie / Chris may have something going along these lines so check to see if they are already on it.
  12982   Wed May 10 16:57:52 2017 ranaUpdateCDSMCautolocker dead

I rebooted megatron around 12:20 today. It had dozens of stalled medm process (some of them there since February!). I couldn't kill them without them coming back like zombies, so I did sudo reboot.

  12985   Thu May 11 09:45:46 2017 ranaUpdateGeneralDAC / Coil Driver noise - SRM coil driver + dewhite board removed

I believe the ETMs and ITMs are different from the others.

  12991   Mon May 15 08:26:43 2017 ranaUpdateCDSSVN up in userapps/cds

I did an 'svn update' in userapps/cds/ which pulled in some changes from the sites as well as various CDS utilities in common/ and utilities/

This was to get Keith Thorne's get_data.m and get_data2.m scripts which I tested and they seem to be able to get data. No success with getting minute trend yet, but that may be a user error.

Update Monday 15-May: Our version of NDS client is 0.10 and we need to have 0.14 for this new method to work. Ubuntu12 lscsoft repo doesn't have newer nds client so we'll have to upgrade some OS.

  12993   Mon May 15 20:43:25 2017 ranaConfigurationComputerscatastrophic multiple monitor failures

this is not the right one; this Ethernet controlled strip we want in the racks for remote control.

Buy some of these for the MONITORS.


Surge protective power strip was install on Friday, May 5 in the Control Room

Computers not connected to the UPS are plugged into Isobar12ultra.


That's a new failure mode. Probably we can't trust the power to be safe anymore.

Need Steve to order a couple of surge suppressing power strips for the monitors. The computers are already on the UPS, so they don't need it.


  13007   Tue May 23 15:22:04 2017 ranaUpdateOptical LeversBeam Profiling Results
  1. Include several sources of error. Micrometer error is one, but you should be able to think of at least 3 more.
  2. There should be an error bar for the x and y axis.
  3. Also, use pdftk to put the PDFs all into a single file. Remove so much whitespace.
  4. Google 'beautiful plots python' and try to make your plots for the elog be more like publication quality for PRL or Nature.
  13031   Thu Jun 1 20:16:11 2017 ranaUpdateCamerasGigE installation in the IFO area

Good installation. I think the images are still out of focus, so try to resolve into some small dots at the low exposure setting.

  13037   Sun Jun 4 14:19:33 2017 ranaFrogsComputersNetwork slowdown: Martians are behind a waterwall

A few weeks ago we did some internet speed tests and found a dramatic difference between our general network and our internal Martian network in terms of access speed to the outside world.

As you can see, the speed from nodus is consistent with a Gigabit connection. But the speeds from any machine on the inside is ~100x slower. We need to take a look at our router / NAT setup to see if its an old hardware problem or just something in the software firewall. By comparison, my home internet download speed test is ~48 Mbit/s; ~6x faster than our CDS computers.

controls@megatron|~> speedtest
/usr/local/bin/speedtest:5: UserWarning: Module dap was already imported from None, but /usr/lib/python2.7/dist-packages is being added to sys.path
  from pkg_resources import load_entry_point
Retrieving speedtest.net configuration...
Testing from Caltech (
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Race Communications (Los Angeles, CA) [29.63 km]: 6.52 ms
Testing download speed................................................................................
Download: 6.35 Mbit/s
Testing upload speed................................................................................................
Upload: 5.10 Mbit/s
controls@megatron|~> exit
Connection to megatron closed.
controls@nodus|~ > speedtest
Retrieving speedtest.net configuration...
Testing from Caltech (
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Phyber Communications (Los Angeles, CA) [29.63 km]: 2.196 ms
Testing download speed................................................................................
Download: 721.92 Mbit/s
Testing upload speed................................................................................................
Upload: 251.38 Mbit/s

Attachment 1: Screen_Shot_2017-06-04_at_1.47.47_PM.png
Attachment 2: Screen_Shot_2017-06-04_at_1.44.42_PM.png
  13042   Mon Jun 5 15:04:33 2017 ranaUpdateCamerasAttempt to run camera server Python code

Right - we want to be compatible with new version of the code, so instead of moving the files to where the code wants them you should make symlinks. The symlinkks go in the place that the code wants and points back to the place where we have the files now.

For the textoverlay, you can just comment it out for now. We can add it back in later once we decide on how to label the video.

  13044   Mon Jun 5 21:53:55 2017 ranaUpdateComputersrossa: ubuntu 16.04

With the network config, mounting, and symlinks setup, rossa is able to be used as a workstation for dataviewer and MEDM. For DTT, no luck since there is so far no lscsoft support past the Ubuntu14 stage.

  13061   Mon Jun 12 22:23:20 2017 ranaUpdateIMCIMC wonkiness

wonder if its possible that the slow glitches in MC are just glitches in MC2 trans QPD? Steve sometimes dances on top of the MC2 chamber when he adjusts the MC2 camera.

I've re-enabled the WFS at 22:25 (I think Gautam had them off as part of the MC2 glitch investigation). WFS1 spot position seems way off in pitch & yaw.

From the turn on transient, it seems that the cross-coupled loops have a time constant of ~3 minutes for the MC2 spot, so maybe that's not consistent with the ~30 second long steps seen earlier.

  13100   Fri Jul 7 14:34:27 2017 ranaUpdateCamerasHDR images of ETMX

i wonder how 'HDR' these images really are. is there a quantitative way to check that we are really getting more bits? also, how many bits does the PNG format allow for monochrome images? i worry that these elog images are already lossy.


  13102   Sun Jul 9 08:58:07 2017 ranaUpdateGeneralETMY TRANS QPD anomaly

Indeed, the whole point of the high/low gain setup is to never use the QPDs for the single arm work. Only use the high gain Thorlabs PD and then the switchover code uses the QPD once the arm powers are >5.

I don't know how the operation procedure went so higgledy piggledy.

  13119   Sat Jul 15 13:40:59 2017 ranaUpdateCamerasBRDF Calibrations

Power meter only needed to measure power going into the paper not out. We use the BRDF of paper to estimate the power going out given the power going in.

  13128   Wed Jul 19 18:24:15 2017 ranaSummarySUSoplev laser summary updated

The $1000 HeNe should not be used for illuminating fibers.

You should purchase these (total price per laser less than $6):

  1. 10 red laser diodes for $2.39 total
  2. 3-5 Vdc adapters
  13140   Tue Jul 25 00:03:01 2017 ranaOmnistructureTreasurecoffee pot lid

I have recommissioned the Zojirushi coffee pot lid. You may, once again, align the dots in order to make the carafe pourable.


The Zojirushi lid is a two part mechanism:

  1. The top part of the lid must be removed for cleaning.
  2. When replacing the lid the two components must be aligned to < 3 mrad precision so that the "teeth" are able to land in the groove.
  3. There is a 4-fold degeneracy in this process. To break the degeneracy, align the dot on top with the spout gap (visible from the bottom view).
  4. After proper alignment and mating, the two parts should snap together and the relative alignment wiggle available should be < 2 mrad.
  5. After screwing the two-piece lid onto the carafe, ensure that the 2 dots are separated by < 170 deg in the closed position.
  13155   Mon Jul 31 23:39:02 2017 ranaUpdateCOCCavity Scan Simulation Code

Hiro Yamamoto has updated SIS (Static Interferometer Simulation) to allow us to do the MCMC based inference of the 40m arm cavity mirror maps. 

The latest version is in git.ligo.org: IFOsim/SIS/

In the examples directory I have put 3 files:

  1. mcmcCavityScans.m - runs many cavity scans using parfor and saves the data
  2. plotCavityScans.m - loads the .mat file with the data and plots it
  3. plotCavityScans.py - python file which also loads & plots, but nicer since python has a transparency option for the traces.

Attached is the plots and the data. The first attached plot is a low resolution one: 200 scans of 100 frequency points each. Second plot is 200 scans of 300 points each.

The run was done assuming perfect LIGO arm params with a random set of Zernike perturbations for each run. The amplitude of each Zernike was chosen from a Normal distribution with a standard deviation of 10 nm.

We need to come up with a better guess for the initial distribution from which to sample, and also to use the more smart sampling that one does using the MCMC Hammer.

Attachment 1: manyCavityScans-SIS.pdf
Attachment 2: manyCavityScans-SIS.pdf
Attachment 3: MonteCarlo_CavityScans.mat
  13157   Tue Aug 1 19:23:06 2017 ranaUpdateALSX - arm alignment

Rana, Naomi

We dither locked the X arm and then aligned the green beam to it using the PZTs. Everything looks ready for us to do a mode scan tomorrow.

We got buildup for Red and Green, but saw no beat in the control room. Quick glance at the PSL seems OK, but needs more investigation. We did not try moving around the X-NPRO temperature.

Tomorrow: get the beat, scan the PhaseTracker, and get data using pyNDS.

  13162   Thu Aug 3 10:51:32 2017 ranaUpdateCDSNDS2 server restarted, /frames mounted on megatron

same issue on NODUS; I edited the /etc/fstab and tried mount -a, but it gives this error:

controls@nodus|~ 1> sudo mount -a
mount.nfs: access denied by server while mounting fb1:/frames

needs more debugging - this is the machine that allows us to have backed up frames in LDAS. Permissions issues from fb1 ?

  13166   Fri Aug 4 09:07:28 2017 ranaUpdateCDSCDS system essentially NOT fully recovered

Tried getting trends with dataviewer just now since Jamie re-enabled the minute_raw frame writing yesterday. Unable to get trends still:

Connecting to NDS Server fb1 (TCP port 8088)
Connecting.... done
Server error 18: trend data is not available
datasrv: DataWriteTrend failed in daq_send().
unknown error returned from daq_send()T0=17-08-04-08-02-22; Length=28800 (s)
No data output.

  13169   Mon Aug 7 16:00:41 2017 ranaUpdateGeneralBilinear noise coupling

These are not the angular test parameters that we're looking for:

 recall that what we want is the low frequency beam spot variations and the feedback to be limited to a small high frequency band.

e.g. only inject noise at 40-50 Hz, not loud enough to find at 2x the injected frequency.

It should NOT be the case that the high frequency injected noise be dominating the RMS.

The coupling should be ~1e-3; some combination of beam spot mis-centering and beam spot motion.

  13176   Wed Aug 9 12:05:57 2017 ranaUpdateElectronicsdata archiving

This kind of data fitting and analysis is really useful. We should figure out a way to archive it. Perhaps the data files and fitting stuff can be put into GIT in some smart way? The fit results can be added to the 40m MC electronics DCC tree. Then the links can be added to this elog.

  13179   Wed Aug 9 16:34:46 2017 ranaUpdateVACVacuum Document recovered

Steve and I found the previous draft of the 40m Vacuum Document. Someone in 2015 had browsed into the Docs history and then saved the old 2013 version as the current one.

We restored the version from 2014 which has all of Steve's edits. I have put that version (which is now the working copy) into the DCC:  https://dcc.ligo.org/E1500239.

The latest version is in our Google Docs place as usual. Steve is going to have a draft ready for us to ready be Tuesday, so please take a look then and we can discuss what needs doing at next Wednesday's 40m meeting.

  13188   Thu Aug 10 21:22:06 2017 ranaSummaryPEMtemperature sensor
  • Should we use the AD590 or the AD592? They're sort of the same, but have slightly different packages and specs.
  • Given the sensitivity of the AD590 to power supply drift, I would recommend using a precision voltage reference like the AD581 or AD587. Take a look at the datasheets and order a few different varieties so we can see what works best for us. I believe that the voltage regulators have too much drift to use for precision temperature control.
  • The AD590 datasheet has a few example circuits showing how we can subtract off the offset which comes the 1 uA/K coefficient of the AD590 (i.e. we would have 295 uA at room temperature, trying to stabilize to +/- 0.1 K)
  • For the first prototypes its fine to use some solderable protoboard assembly, but we will eventually have to figure out how to package this thing and interface it with our Acromag slow controls system.

also, I've attached some temperature noise spectra from the LISA group at the AEI in Hannover. It will be interesting to see if we get the same results.

Attachment 1: tempsensnoise2.pdf
Attachment 2: tempnoise_final.pdf
  13193   Fri Aug 11 11:56:02 2017 ranaUpdatePEMtemperature sensor

Might as well order several of a few different varieties today. Its good to have some extra in stock; we don't always want to have to wait days for parts to show up. If you give Steve a list of parts to buy he can order them today or Monday.

There should also be some precision 5V sources (e.g. AD586) that you can try.

  13200   Sat Aug 12 22:35:22 2017 ranaUpdateSUSGlitches stay on MC1

To add to Gautam's entry: we swapped the cables at the coil driver side (these are the ones that go from coil driver to sat box). In this state, damping is not useable since the MC1 servos would drive MC3.

~70 counts in the sensor means ~70 microns of motion. Since the watchdogs are off and the coil drivers are swapped, this can't be laser beam getting in to the sensors.

WE have to consider that these are some real strain release type events happening in the suspension wire or wire standoff, so may require a vent to inspect and possible repair MC1.

  13244   Tue Aug 22 23:27:14 2017 ranaUpdateALSALS OLTFs

Didn't someone look at what the OLG req. should be for these servos at some point? I wonder if we can make a parallel digital path that we switch on after green lock. Then we could make this a simple 1/f box and just add in the digital path (take analog control signal into ADC, filter, and then sum into the control point further down the path to the laser) for the low frequency boost.

  13255   Fri Aug 25 17:11:07 2017 ranaUpdateALSFiber ALS noise measurement

Is it better to mount the box in the PSL under the existing shelf, or in a nearby PSL rack?



Further characterization needs to be done, but the results of this test are encouraging. If we are able to get this kind of out of loop ALS noise with the IR beat, perhaps we can avoid having to frequently fine-tune the green beat alignment on the PSL table. It would also be ideal to mount this whole 1U setup in an electronics rack instead of leaving it on the PSL table


  13257   Sun Aug 27 11:57:31 2017 ranaUpdateALSFiber ALS noise measurement

It seems like the main contribution to the RMS comes from the high frequency bump. When using the ALS loop to lock the arm to the beat, only the stuff below ~100 Hz will matter. Interesting to see what that noise budget will show. Perhaps the discrepancy between inloop and out of loop will go down.

  13270   Tue Aug 29 20:04:09 2017 ranaUpdatePSLPSL table auxiliary NPRO

I don't understand why the 1st order diffracted beam doesn't go to zero when you shut off the drive. My guess is that the standing acoustic wave in the AO crystal needs some time to decay: f = 40 MHz, tau = 1 usec... Q ~ 100. Perhaps, the crystal is damped by the PZT and ther output impedance of the mini-circuits switch is different from the AO driver.

In any case, if you need a faster shut off, or want something that more cleanly goes to zero, there is a large (~1 cm) aperture Pockels cell that Frank Siefert was using for making pulses to damage photo diodes. There is a DEI Pulser unit near the entrance to the QIL in Bridge which can drive it.

  13277   Wed Aug 30 22:15:47 2017 ranaOmnistructureComputersUSB flash drives moved

I have moved the USB flash drives from the electronics bench back into the middle drawer of the cabinet next to the AC which is west of the fridge. Drawer re-enlabeled.

  13279   Thu Aug 31 00:46:57 2017 ranaSummaryCDSallegra -> Scientific Linux 7.3

I made a 'LiveCD' on a 16 GB USB stick using this command after the GUIs didn't work and looking at some blog posts:

sudo dd if=SL-7.3-x86_64-2017-01-20-LiveCD.iso of=/dev/sdf


Debian doesn't like EPICS. Or our XY plots of beam spots...Sad!


No, not confused on that point. We just will not be testing OS versions at the 40m or running multiple OS's on our workstations. As I've said before, we will only move to so-called 'reference' systems once they've been in use for a long time.

Ubuntu16 is not to my knowledge used for any CDS system anywhere.  I'm not sure how you expect to have better support for that.  There are no pre-compiled packages of any kind available for Ubuntu16.  Good luck, you big smelly doofuses. Nyah, nyah, nyah.

K Thorne recommends that we use SL7.3 with the 'xfce' window manager instead of the Debian family of products, so we'll try it out on allegra and rossa to see how it works for us. Hopefully the LLO CDS team will be the tip of the spear on solving the usual software problems we have when we "~up" grade.

  13290   Mon Sep 4 18:18:29 2017 ranaUpdateLSCdewhite switching: FOTON settings

not immediately necessary, since you have already got it sort of working, but one of these days we should optimize this for real. In the past, we used to do this by putting a o'scope on the coil Vmon during the switching to catch the transient w/ triggering. We download the data/picture via ethernet. Run for loop on tolerance to see what's what.

  1. Went into the Foton filter banks for all the coil output filters, and modified the "Output" settings to be on "Input crossing", with a "Tolerance" of 10 and a "Timeout" of 3 seconds. These settings are to facilitate smooth transition between the two signal paths (without and with coil-dewhitening). The parameters chosen were arbitrary and not optimized in any systematic manner.


  13315   Sat Sep 16 10:56:19 2017 ranaUpdateLSCCoil de-whitening switching investigation

The absence of evidence is not evidence of absence.

  13323   Wed Sep 20 15:49:26 2017 ranaOmnistructureComputersnew internet

Larry Wallace hooked up a new switch (Brocade FWS 648G) today which is our 40m lab interface to the outside world internet. Its faster.

He then, just now, switched over the cables which were going to the old one into the new one, including NODUS and the NAT Router. CDS machines can still connect to the outside world.

In the next week or two, he'll install a new NAT for us so that we can have high speed comm from CDS to the world.

  13326   Thu Sep 21 01:55:16 2017 ranaUpdateALSX End table of Shame

Image #1: No - we do not use magnetic mounts for beam dumps. Use a real clamp. It has to be rigid. "its not going anywhere" is a nonsense statement; this is about vibration amplitude of nanometers.

Image #2: No - we do not use sticky tape to put black glass beam dumps in place ever, anywhere. Rigid dumps only.

Image #3: Please do not ruin our nice black glass with double sticky tape. We want to keep the surfaces clean. This one and a few of the other Mickey Mouse black glass dumps on this table were dirty with fingerprints and so very useless.

Image #4: This one was worst of all: a piece of black glass was sticky taped to the wall. Shameful.

Please do not do any work on this table without elogging. Please never again do any of these type of beam dumping - they are all illegal. Better to not dump beams than to do this kind of thing.

All dumps have to be rigidly mounted. There is no finger contacting black glass or razor dumps - if you do, you might as well throw it in the garbage.

Attachment 1: 20170921_003143.jpg
Attachment 2: 20170921_002430.jpg
Attachment 3: 20170921_002243.jpg
Attachment 4: 20170921_001906.jpg
  13329   Sun Sep 24 20:47:15 2017 ranaUpdateComputer Scripts / ProgramsRF TF Uncertainties

I have made several changes to Craig's script for better pythonism. Its more robust with different libraries and syntaxes and makes a tarball by default (w/o a command line flag). These kinds of general util scripts will be going into a general use folder in the git.ligo.org/40m/ team area so that it can be used throughout the LSC.

I don't think we need/want a coherence calculation, so I have not included it. Usually, we use coherence to estimate the uncertainty, and here we are just plotting it directly from the dist of the sweeps so coherence seems superfluous.

Attachment 1: TFAG4395A_21-09-2017_115547_FourSquare.pdf
Attachment 2: TFAG4395A_21-09-2017_115547.tgz
  13363   Fri Oct 6 00:25:45 2017 ranaUpdateLSCFS725 for Marconi stabilization

Steve, can you please connect this fan to the rack power and remove this extra power supply?


Re-arranged the DC bench supply on the shelf in the PSL enclosure, whose only purpose seems to be to supply 12V to a fan attached to the rear of the PSL NPRO controller. Seems to be a waste of space! The fan was momentarily disconnected but has since been reconnected and is spinning again.

ELOG V3.1.3-