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ID Date Author Type Category Subject Text Attachments
  14548   Wed Apr 17 00:50:17 2019 gautamUpdateALSLarge 2kHz peak (and harmonics) in ALS X no moreI looked into this issue today. Initially,
my thinking was that I'd somehow caused
clipping in the beampath somewhere which
 EX_PDHnoise.pdf 
  14547   Wed Apr 17 00:43:38 2019 gautamUpdateFrequency noise measurementMZ interferometer ---> DAQ
Delay fiber was replaced with 5m
(~30 nsec delay)

The fringing
of the MZ was way too large even with the
  
  14546   Tue Apr 16 22:06:51 2019 gautamUpdateVACVac interlock tripped againThis happened again, about 30,000 seconds
(~2:06pm local time according to the logfile)
ago. The cited error was the same -
 Screenshot_from_2019-04-16_22-05-47.pngScreenshot_from_2019-04-16_22-06-02.png 
  14545   Mon Apr 15 22:55:34 2019 gautamFrogsThermal CompensationLab thermostat adjustedIt is feeling cold in the office area.
According to the digital wall clock near
the coffee machine, it is 19C. Rana bumped
  
  14544   Mon Apr 15 22:39:10 2019 gautamUpdateFrequency noise measurementAlternate setup with PSL pickoff[anjali, gautam]

just main points, anajli is going
to fill out the details.
  
  14543   Mon Apr 15 18:29:07 2019 ranaSummaryComputersnew laptop setup: ASIA - yum issueshad trouble using YUM to update. This turned
out to be a config problem with our Martian
router, not the new laptop. Since I've
  
  14542   Mon Apr 15 18:13:23 2019 ranaUpdateComputer Scripts / ProgramsAutomated suspension testing with susPythonif this gonna be general for everybody,
maybe it oughta be called IFOtest
(like the last incarnation that was tried
  
  14541   Mon Apr 15 10:20:44 2019 gautamUpdateOptical LeversBS Oplev PIT was oscillatingThe AS spot on the camera was oscillating
at ~3 Hz. Looking at the Oplevs, the culprit
was the BS PIT DoF. Started about 12 hours
 BS_OL_oscillating.png 
  14540   Fri Apr 12 01:22:27 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron sourceThe alignement was disturbed after the
replcement of the beam splitter. We tried
to get the alignment back . But we are
  
  14539   Thu Apr 11 17:30:45 2019 JonUpdateSUSAutomated suspension testing with susPythonSummary

In anticipation of
needing to test hundreds of suspension
signals after the c1susaux upgrade, I've
  
  14538   Thu Apr 11 12:57:48 2019 JonUpdateSUSStarting some scripted SUS tests on ITMYTesting is finished.




  
  14537   Thu Apr 11 12:21:01 2019 not KojiUpdatePSLPSL fan is noisyI could probably install the new fan if
we have one.  Can you do without the
laser for a while?
  
  14536   Thu Apr 11 12:04:43 2019 JonUpdateSUSStarting some scripted SUS tests on ITMYWill advise when I'm finished, will
be by 1 pm for ALS work to begin.
  
  14535   Thu Apr 11 11:42:10 2019 KojiUpdatePSLPSL fan is noisyThis thread: ELOG
10295

My interpretation of these ELOGs
  
  14534   Thu Apr 11 09:05:06 2019 AnjaliUpdateIOOSpooled fiber
Attchment #1,2,3 and 4 shows the
results with frequency modulation of 32 Hz,
140 Hz , 300 Hz and without frequency modulation.
 Frequecy_modulation_32_Hz.pdfFrequecy_modulation_140_Hz.pdfFrequecy_modulation_300_Hz.pdfWithout_modulation.pdfNew_fiber_spool.JPG 
  14533   Thu Apr 11 01:10:05 2019 gautamUpdateALSLarge 2kHz peak (and harmonics) in ALS XThese weren't present last week. The
peaks are present in the EX PDH error monitor
signal, and so are presumably connected with
 EX_PDH_2kNoise.pdf 
  14532   Wed Apr 10 23:37:59 2019 gautamUpdatePSLPSL fan is noisyAttached is my phone recording of what
it sounds like right now in the PSL enclosure
- not good for frequency noise measurement!
 New_Recording.m4a 
  14531   Wed Apr 10 22:59:22 2019 gautamUpdateIOOSpooled fiberSteve had showed me some stock of long
fibers a while back - they are from Oz Optics,
and are 50m long, and are already spooled
  
  14530   Wed Apr 10 16:58:54 2019 ranaUpdateIOOfiber MZ for NPRO freq noise measurementsCan we get some panel
mount FC/APC connectors and put them on a
  
  14529   Wed Apr 10 00:33:09 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron source
Attachement #1 shows the input
(ch4-green) modulation frequency and
the photodiode output (ch1-yellow) when the
 Modulation_frequency_100Hz.jpgModulation_frequency_30Hz.jpgModified_setup.JPG 
  14528   Tue Apr 9 19:07:12 2019 gautamUpdateALSIR ALS noise budgetUpdated the noise budget to include the
unsuppressed frequency noise from the EX
laser. It does not explain the noise
 ALS_noiseBudget.pdfALS_noiseBudget.pdf 
  14527   Tue Apr 9 18:44:00 2019 gautamUpdateALSEX Green PDH discriminant measurementI decided to use the more direct method,
of disconnecting feedback to the EX laser
PZT, and then looking at the cavity flashes. 
 cavityFlashes.pdfmodelPDH.pdf 
  14526   Tue Apr 9 00:18:19 2019 gautamUpdateALSEX Green PDH error monitor calibratedwrong assumption - i checked the gain just
now, it is G=10, and is running in the "low-noise"
mode, so can only drive 4V. fixed elog, filter.
  
  14525   Tue Apr 9 00:16:22 2019 ranaUpdateALSEX Green PDH error monitor calibratedG=10 or
G=100?
  
  14524   Mon Apr 8 23:52:09 2019 gautamUpdateALSEX Green PDH error monitor calibratedSome time ago, I had done an actuator
calibration of ITMX. This suspension
hasn't been victim to the recent spate
 errMonCalib.pdferrMon.pngOLTF.pdfEX_frequencyNoises.pdf 
  14523   Mon Apr 8 18:28:25 2019 gautamUpdateALSEX Green PDH checkoutI worked on characterizing the green PDH
setup at EX, as part of the ALS noise budgeting
process. Summary of my findings:
 IMG_7393.JPGgreenModeMatch.pdf 
  14522   Mon Apr 8 11:53:17 2019 gautamUpdateCDSc1oaf needs debuggingI tried restarting c1oaf this weekend to
see if turning on the MC length FF would
affect the ALS noise performance. I burtrestored
 c1oaf_sat.pngMCL_FF_TF.pdf 
  14521   Mon Apr 8 00:04:08 2019 gautamUpdateALSIR ALS noise budgetTo start the noise budgeting, I decided
to measure the "DFD noise", which
is really the quadrature sum of the following
 DFDnoise.pdf 
  14520   Sat Apr 6 02:07:40 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron source
The alignment of the output beam
from the delayed path of MZI to the photodetector
was disturbed when we did the polarisation
  
  14519   Fri Apr 5 11:49:30 2019 gautamUpdateALSPSL + X green beat recoverySince we haven't been using it, the
PID control was not enabled on the doubling
oven on the PSL table (it is disabled after
  
  14518   Fri Apr 5 11:40:57 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron source
Attachment #1 shows the present
experimental setup. The photodiode is now
replaced with PDA255. The farther end of
 Modified_experimental_setup.JPGChecking_polarisation.pdfChecking_the_polarisation_alignment_of_the_delay_fiber.pdfSetup_to_test_the_polarisation_alignment_of_delay_fiber.JPG 
  14517   Fri Apr 5 01:10:18 2019 gautamUpdateVACTP3 forepump is also noisyIs this one close to failure as well?   
  14516   Fri Apr 5 00:33:58 2019 gautamUpdateALSPromising IR ALS noiseSummary:

I set up a free-space
beat on theNW side of the PSL table between
 IMG_7388.JPGfreeSpace_IR_beat.pdf 
  14515   Wed Apr 3 18:35:54 2019 gautamUpdateVACPSL shutter re-openedPSL shutter was re-opened at 6pm local
time. IMC was locked. As of 10pm, the main
volume pressure is already back down to the
  
  14514   Wed Apr 3 16:17:17 2019 JonUpdateVACTP2 forepump replacedI can't explain the mechanical switching
sound Gautam reported. The relay controlling
power to the TP2 forepump is housed in the
 IMG_3180.jpg 
  14513   Wed Apr 3 12:32:33 2019 KojiUpdateALSNote about new fiber couplersAndrew seems to have an integrated solution
of PBS+HWP in a singe mount. Or, I wonder
if we should use HWP/QWP before the coupler.
  
  14512   Wed Apr 3 10:42:36 2019 gautamUpdateVACTP2 forepump replacedBob and Chub concluded that the drypump
that serves as TP2's forepump had failed.
Steve had told me the whereabouts of a spare
  
  14511   Wed Apr 3 09:07:46 2019 gautamUpdateVACVac failureOvernight pressure trends don't suggest
anything went awry after the initial interlock
trip. 
 vacFailOvernight.png 
  14510   Wed Apr 3 09:04:01 2019 gautamUpdateALSNote about new fiber couplersThe new fiber beam splitters we are ordering,
PFC-64-2-50-L-P-7-2-FB-0.3W,
have the slow axis working and fast axis
  
  14509   Tue Apr 2 18:40:01 2019 gautamUpdateVACVac failureWhile glancing at my  vacFail.png 
  14508   Tue Apr 2 15:02:53 2019 JonUpdateCDSITMY freed    
  14507   Tue Apr 2 14:53:57 2019 gautamUpdateCDSc1vac added to burtI deleted references to c1vac1 and c1vac2
(which no longer exist) and added c1vac to
the autoburt request file list at 
  
  14506   Mon Apr 1 22:33:00 2019 gautamUpdateCDSITMY freedWhile Anjali is working on the 1um MZ setup,
the pesky ITMY was liberated from the OSEMs.
The "algorithm" :
  
  14505   Mon Apr 1 12:01:52 2019 JonUpdateCDS I brought c1susaux back online this morning
for suspension-channel test scripting. It
had been dead for some time. I followed
  
  14504   Sun Mar 31 18:39:45 2019 AnjaliUpdateAUXAUX laser fiber moved from AS table to PSL table

Attachment #1 shows the schematic
of the experimental setup for the frequency
noise measurement of 1 um laser source.
 Schematic_of_experimental_setup_for_frequency_stabilisation_of_1_micron_source.png1_micron_setup_for_frequency_noise_measurement.JPG1_micron_setup_for_frequency_noise_measurement_power_levels.png 
  14503   Sun Mar 31 15:05:53 2019 gautamUpdateALSFiber beam-splitters not PMI looked into this a little more today.


Looking at the beat signal
between the PSL and EX beams from the
 IMG_7384.JPG 
  14502   Fri Mar 29 21:00:06 2019 gautamUpdateALSBeatMouth with NF1611s installed
Newfocus 15V current limited supply
was taken from bottom NE corner of the ITMY
Oplev table to power the BeatMouth on the
 IMG_7384.JPGIMG_7385.JPG 
  14501   Fri Mar 29 15:47:58 2019 gautamUpdateAUXAUX laser fiber moved from AS table to PSL table[anjali, gautam]

To facilitate the 1um MZ frequency
stabilization project, I decided that the
  
  14500   Fri Mar 29 11:43:15 2019 JonUpdateUpgradeFound c1susaux database bugI found the current bias output channels,
C1:SUS-<OPTIC>_<DOF>BiasAdj,
were all pointed at C1:SUS-<OPTIC>_
  
  14499   Thu Mar 28 23:29:00 2019 KojiUpdateSUSSuspension PD whitening and I/F boards modified for susaux replacementNow
the sus PD whitening bards
are ready to move the 
 IMG_7474.JPGD000210_backplane.pdfScreenshot_from_2019-03-28_23-28-23.png 
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