TITLE:  12/13 EVE Shift:  00:00-08:00UTC (16:00-00:00PDT), all times posted in UTC     

STATE of H1:   4+ Hrs of locking (Almost 3hrs in Observing) at around 80Mpc.

Incoming Operator:  Jeff B.

Support:  Sheila On Phone at beginning of shift

Quick Summary:

We shook the PSL table and all chambers at the corner station except ITMY individually. By far the greatest up-conversion was at the BS. The figure shows that even a 20% increase in 1-80 Hz GS13 BLRMS produces bumps at higher frequencies. The up-conversion from injected peaks is not broadband like magnet domain changing noise, and is not a harmonic series like from scattering or saturation, but, instead produces peaks that look like intermodulation products.

Robert, Jordan

• useism still high, & winds are low.
• Performed an Initial Alignment & locked up H1 with Sheila's assistance over the phone.
• Robert has completed injection work for the night.
• H1 taken to Observing at 4:52utc with a range hovering between 75-80Mpc.

After the Initial Alignment, it took about 60-90min of attempts with H1 falling out at various points (as noted in newsreel posts earlier).  Finally made it on this current attempt.  No real issues, other than needing to engage the ISS 2nd ISS Loop by hand (per Kiwamu's alog 22449).  So, the latter causes the range to look low (~30Mpc a few minutes) while engaging 2nd Loop.  I actually took a little time here to read the alog, and put the output channel on a striptool, so I would have a better idea of when to turn ON the 2nd Loop.

• useism is still high...LVEA's average is about 0.8um/s with some data points above 1um/s every once in a while.   
• Wind has noticeably died in the last 90min to mainly under 5mph

range is has been hovering at a shy 80Mpc.  NO SDF diffs

Observatory Mode is now:  COMMISSIONING (this is due to Robert beginning chamber-shaking injections; he said on the order of ~1hr.)

Off to make supper.

Making notes from Initial Alignement work, locking and chatting with Sheila:

Initial Alignment:

• Started another Initial alignment
• ALS already looked good, so Offloaded GREEN WFS.
  • While offloading, Yarm dropped.  So, offloaded by hand (tweaked ETMy Yaw slider until the M0 LOCK OUTPUT went from -14 to ~0.)
• PR3 Adjustment:  COMM Beatnote was low so adjusted PR3 a bit in mainly Pitch.  (went from 2.4 to 4.7, want to be between 4-5).
• Input Align
  • Not locking
  • Flashes mainly up to 0.55 seen on dv
  • Camera seems to show misalignment off diagonally
  • Increased XARM gain from 0.05 to 0.15 (no luck), and then to 0.2...Xarm locked after about a minute.  Went from 0.8 to about 1.0 via WFS.  Looked at the StripTool on the wall, and those channels looked to converge to 0.  
  • Offloaded...as I did this I watched PR2 & IM4's M1 LOCK OUTPUTS go to zero = GOOD!
• PRM Align, no issues.
• Dark Michelson, no issues (minor BS tweaks)
• SRC Align, no issues
• On to locking, & crossing fingers.

Locking

DRMI locking:  POP18 & 90 looked good with flashes flashing up to 150-200 on dataviewer, BUT the AS camera would have some ugly modes every min or so.  Have had a DRMI lock...but only for a about 20sec and then 18 & 90 dropped.  Might look at PRMI....oh wait, DRMI LOCKED....Stay tuned!

TITLE:  12/13 EVE Shift:  00:00-08:00UTC (16:00-00:00PDT), all times posted in UTC     

STATE of H1:  DOWN

Outgoing Operator:  TJ

Quick Summary:

After getting hand-off from TJ, will take another look at Input Alignment (will watch x-arm power on DV & also the AS camera to look for obvious misalignment...if needed, will tweak PR2.  Will also increase XARM digital gain to see if this helps as well [these were suggestions Sheila gave me over the phone]).  If this does not work, I might look at Input Pointing over the last few weeks/months to see what our current state looks like compared to the past.  

Conditions look decent (no winds, under 10mph), but useism is still roaring (LVEA is hovering around 1um/s).

• TITLE: 12/13 Day Shift: 16:00-00:00UTC (08:00-16:00 PDT), all times posted in UTC"

• STATE Of H1: Down

• SHIFT SUMMARY: I managed to relock the IFO for about 4hrs, but then after I haven't had such a good time. Robert and Jordan went in to relocate some shakers, but this tripped the ISI's for ITMX, BS, and HAM3. After that I had to redo the initial alignment, but I couldn't get INPUT_ALIGN to work. I have trended values to see where they were before the WD trip but this hasn't made anything better (worse probably). Hopefully Corey has some more tricks up his sleeve.

• INCOMING OPERATOR: Corey

• ACTIVITY LOG:

• 18:56 Robert to LVEA starting inj
• 21:15 Lockloss
• 21:28 Start IA
• 21:52 IA done, Robert to LVEA to move shakers
• 22:30 Redo IA; ISI's for ITMX, BS, HAM3 WD tripped from shaker relocation
•  

Really similar to alog24151 from yesterday. Saw the oscillation buid up and had no idea how to stop it.

Pat Meyers, Nelson Christensen, and I have been investigating coherence lines between H1 and L1 in the 20-45 Hz band (data generated from stochmon, found here). We cross-referenced these lines with using results from STAMP-PEM and the coherence tool.

You can find results for our analysis around 25 Hz here. Attached is an analysis of coherence lines at H1 from 36-42 Hz. There are interesting lines at approximately 41 Hz and 38.7 Hz.

Our corresponding results at L1 can be found here.

Pat, Nathaniel, Nelson

Back to Observing, Robert is done for now. Wind <20mph, useism 1um/s, lights off, CW inj running, 21.9 W. 

LLO is still down and will probably be for some time, they have a large storm coming through. 

C. Cahillane

Here is the uncertainty budget for LHO.
PDF 1 contains the C01 uncertainty budget.  PDF 2 contains the C02 uncertainty budget.  C01 leaves the kappas uncorrected, while C02 is the "perfect" calibration with kappas corrected.  Both C01 and C02 have the static systematic errors corrected. C00 is the so-called "Nominal" model.  
To see the differences between C01 and C02, see PDF 5.
The uncertainty budget is dominated by the magnitude sensing function.  This is due to its nonlinear systematic error at low frequencies.  You can see this in PDF 4.  The actuation fits are in PDF 3.

LHO has strain uncertainty of under 5% and 3 degrees.   (See Plots 8 and 9 in PDF 1 or 2)

Made it to NLN, I think I got lucky with the winds dropping to 20mph.

Robert will start his inj here in a min.

The diffracted power for the ISS was going from 0 to 20% on the MEDM screen and both Travis and
Jeff were having problems getting the servo to lock.  I tried the following steps to see what the
behaviour was:
 - the autolock was dis-engaged
 - decreased the gain from 16.0 dB to 3.0 dB -> no effect
 - increased the magnitude of REFSIGNAL from -2.02 to about -2.30 -> no real improvement
 - turned off the integrator -> no real improvement
 - turned off the second loop -> no improvement

Then it was onward to some signal tracing ... The ISS acousto-optic modulator (AOM) gets its 80 MHz
RF input from one of the oscillators in the ISC.  According to the ISC_CUST_REMOTERACKS MEDM screen
it'd be the VCO in slots 24 and 25.  Its output is amplified by the amplifier in slot 23.  The output
of the RF amplifier was relatively stable, so it was not the cause of the behaviour observed with the
diffracted power.

From the ISS MEDM screen, there were no indications of any signal injections.  Switched AUTOLOCK off
and went to manual mode.  Turned off the integrator.

If it were a loop oscillation, reducing the gain slider ought to help.  The gain slider was reduced
back down to 3.0 dB.  The output AC of PD B indicated that the loop was sporadically locked but the
diffracted power was still varying wildly.  Moved REFSIGNAL in the other direction, dropping it as
low as ~ -0.8.  It was here that the loop showed signs of it being solidly locked according to the
output AC of PDB.  However the diffracted power was around 50%.  REFSIGNAL was then slowly adjusted
to bring the diffracted power to about 16%.  The servo gain was then increased back to its nominal
value of 16 dB.  Everything seemed fine at this point, so the reference signal was adjusted to -1.98
which brought the diffracted power to ~ 7%.

The integrator was engaged, which resulted in a decrease in the diffracted power.  The second loop
was turned on, but not engaged, without any detrimental effects.  AUTOLOCK was restored.
(see ISS-Summary1.png)

At one point the diffracted power did vary and this coincided with the IMC dropping out of lock
(see ISS-medm1.png and ISS-Summary2.png).  One can see in the summary plot three small peaks
in the diffracted power, AOM driver monitor output and PD B output that coincide with when the IMC
dropped out of lock.

So now the question remains as to why this was happening.  The location of the photodetectors for the
first loop ISS is after the pre-modecleaner.  Obviously in order for them to see light, the pre-modecleaner
must be locked.  Which in turn relies on laser frequency excursions to be slower than the response
time of the PZT and its high voltage driver.  Left to itself, the laser frequency does not change
much however it is driven by the need for the IMC to be resonant.  This is split between the frequency
shifting AOM in the FSS and the IMC suspensions.  So if the IMC length changes, for whatever reason,
one would expect to see changes in the ISS.  A quick inspection of H1:IMC-L_OUTPUT to me suggests that
it spent a fair amount of time swinging (see IMC-L.png).

I have edited the ISC_LOCK guardian so that it now turns violin mode damping off before the interferometer reaches nominal low noise. This will hopefully allow us to collect ringdown data on the violin mode fundamentals.

Violin mode damping is still turned on as usual in BOUNCE_VIOLIN_MODE_DAMPING, but it now is turned off in the COIL_DRIVERS state. Thus the modes will still receive a few minutes of damping before DARM is switched to dc readout.

If this behavior needs to be reverted, there is a flag in the main() function of COIL_DRIVERS called self.turnOffViolinDamping which can be set to False.

Violin mode damping in full lock will be re-enabled once sufficient data have been collected.