Overnight fw0 became unstable again. We have two things to try: [1] offloading NDS QFS-NFS data using the new h1ldasgw2 machine, and [2] upgrading a frame writer's NFS network from 1GE to 10GE.

We just did the item [1]. We restarted the h1ldasgw2 solaris machine and hooked it back up to both QLogic switches. This solaris server sees both file systems (h1-ldas-frames and cds-h1-frames), and exports them as read-only NFS mounts. We reconfigured both h1nds0 and h1nds1 to only NFS mount h1ldasgw2, and set up their /frames symbolic links to both see /cds-h1-frames (i.e. the frames written by h1fw1).

So now on the h1fw0 system, h1ldasgw0 is only serving h1fw0 and not h1nds0, and no one is reading its frames except for LDAS disk-to-disk which is archiving the science frames (remember commissioning frames are archived from h1fw1).

State of H1: not able to make it through Locking ALS

Activities:

• early AM, Peter King tweaked up the alignment on the PSL
• I arrived and tried locking
• locking the arms in green went well, and arm powers in green are good
• unable to get through the stage Locking ALS
• Tidal and MC_F are running away each attempt
• with help from JeffK, TJ, and Jenne, track this down to what appears to be a misalignment into the Ref Cav
• plan is to revisit the PSL alignment - Jason and Peter

No significant site activities.

Chris B. noticed that the PINJ_TRANSIENT filter modules were all turned off. I have turned them back on, and updated the Guardian state so that these filters are monitored and set to be on in the observe mode.

Was ~23% and brought it down to 2%.

ALS X was also at 2%

Attached below are the past 10 day PSL trends. The trends reflect, largely the incursion into the enclosure due to the diode failure that occurred on Tuesday morning (July 5)

As usual refer to more in depth analysis to Jasoin O or Peter K.

In depth Chiller analysis can be referred to Jeff B

Came in and engaged the ISS.  Found it was in manual mode.  Left it in auto.  The integrator engaged straight
away.  This was before I did any temperature tuning of the laser diodes.

    Attached is the average diffraction over the past week.  I don't know why the spread was larger over the
past ~4 days and wonder if it was/is a portent of diode troubles.  Things seem okay at the moment.

After yesterday's front end diode box replacement, the diode temperatures were left at the values
from the old diode box.  The diodes are now temperature tuned for what I think is close to the
optimum values.  Optimum being decided by the output power of the front end.

Trouble keeping MC and FSS locked.

23:14 UTC Chandra to CP3
23:17 UTC Jenne and Sheila to LVEA to measure MC open loop gain
00:07 UTC Jenne and Sheila back
00:37 UTC Sheila to LVEA to plug in SR785 for analog measurement of MC open loop gain
00:44 UTC Sheila back
00:50 UTC Sheila to LVEA
00:54 UTC Sheila back
01:44 UTC Sheila to LVEA to set up RF analyzer
01:59 UTC Sheila back

[Sheila, Keita, Jenne, Patrick]

We have been struggling to lock anything at all today.  Sheila is going to post about the loop measurements that we made today, but this alog is a cry for help with regard to the ISS. 

The ISS average diffracted power has been much more noisy than usual, ever since Friday.  Since today's PSL work, it's even worse.  We suspect that this may be bad enough that we are unable to lock.  We can no longer keep the integrator for the first ISS loop engaged for more than a few minutes before the loop starts to oscillate.  But, with or without the integrator on, the diffracted power is moving around like crazy.

At this point, we are leaving the IFO in Down, and hopefully someone from Team PSL will come in and look at the ISS tomorrow, and then maybe locking will be possible.

As a side note, it appears that everything in the PSL is misaligned by a bit.  Both the PMC and RefCav transmissions are about 25% lower than normal, with corresponding increases in their reflected powers.  This is probably the reason that we've had to increase the FSS loop gain earlier today to make locking even the IMC possible (see Sheila's alog).

Evan G., Jeff K., Kiwamu I., Darkhan T.

Summary:
We have processed the DARM open loop gain and sensing function measurements and built a model of the loop that we believe sufficiently represents our knowledge of the parameters. In addition, the actuator coefficients have been remeasured using the Pcal. In summary, our model reproduces the DARM open loop transfer function to within +/-10% in magnitude and within +/-5 degrees in phase from 10 Hz to 1 kHz. Caveat: we have not yet assessed how this translates to the overall calibration uncertainty. Actuation coefficients for L1, L2, and L3 are within +/-5% of their O1 values. This model is used in the recently updated CAL-CS model (alog 28178).

Details:
The DARM measurements made recently (alog 28107) were processed using the updated DARM model code. Included in this new model is a functional form for the SRC detuning (alog 28150), and the fit to the measured data gives updated cavity gain, cavity pole frequency, time delay, and detuning spring frequency. The uncompensated OMC whitening filters are updated (alog 28087). Since the L1, L2, and L3 driver compensation has been updated (alogs 27150 and 27180), we removed all the measured and compensation zeros and poles, except for the uncompensated high frequency zeros and poles of the L3 stage (alog 27619). The AA/AI downsampling filters are using the RCG 3.0 64-16k filter coefficients (alog 27173).

Attached are figures showing (in order) the measurement and model comparison DARM open loop gain transfer function, the measurement and model comparison of the sensing function, and the L1/L2/L3 actuation coefficient measurements calibrated using the Pcal.

It was realized that since we no longer read out H1:CAL-DARM_ERR_WHITEN_OUT_DQ for the for the Pcal to DARM transfer functions--instead we are reading out H1:LSC-DARM1_IN1_DQ--the measurement to model comparison for the sensing function should not include the 1 16k clock cycle delay. However, the model for the sensing function should include this 1 16k clock cycle delay.

We tried a few different values for unknown sensing and actuation delays but did not attempt to optimize this any further.

There are 1 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -2.072 [V]

(full results attached)

Evan G, Darkhan,

Summary

EPICS records that will be used by GDS pipeline for calculation of the DARM time-dependent parameters in ER9 were updated on 05-Jul-2016 17:44:57 PDT (06-Jul-2016 00:44:57 UTC).

Details

The H1 DARM model parameters used for generation of the EPICS values are

• IFO dependent param file: Runs/PreER9/Common/params/IFOindepParams.conf
• IFO dependent, H1, param file: Runs/PreER9/H1/params/H1params.conf
• Measurements param file: Runs/PreER9/H1/params/H1params_2016-07-01.conf

Output files: raw epics values, a verbose log and a Matlab file with EP# variables (see T1500377-08, Table 2) were committed to the calibration SVN directory (the verbose log is also attached to this alog):

Runs/PreER9/H1/Scripts/CAL_EPICS

./20160705_H1_CAL_EPICS_VALUES.txt
./20160705_H1_CAL_EPICS_verbose.log
./D20160705_H1_CAL_EPICS_VALUES.m
./callineParams_20160705.m
./writeH1_CAL_EPICS.m

Runs/O2/Common/Scripts/CAL_EPICS/writeO2_TDEP_EPICS.m

J. Kissel, E. Goetz, K. Izumi, D. Tuyenbayev

Evan will post the details of the work we've had to do to get the model running, but in the interest of time, I've taken what we needed from the Matlab model to update the CAL-CS front-end filters. Since early results indicate that the only low-frequency (sub-Nyquist) things that have changed from the O1 model are in the sensing function (see LHO aLOG 28171):
   - Lower optical gain = 9.071e5 [ct/m],
   - Lower frequency DARM coupled cavity pole frequency, f_c = 328.7 Hz, and
   - New SRC-detuned optical spring frequency, f_s = 9.831 Hz.
I only needed to update the H1:CAL-CS_DARM_ERR inverse sensing function filter (see further discussion below). 

The new settings have been captured in the SDF system.

Details of the design:
Foton Design String --
       zpk([9.831;-9.831;328.7],[0.1; 0.1;7000],1,"n")gain(9574.81)*gain(1.102e-6)
The gain of 1.102e-6 is 1 / 9.071e5 [ct/m], this lives separately in FM4, called "ER9gain." In FM3, in the filter called "SRC D-2N" for "Signal Recycling Cavity De-Two-Ne" there lies:
- The pair of real poles at 9.831 Hz, one of which is in the right-half-plane, reflect the detuning dynamics. Note that we've rolled of these inversion zeros at low frequency of two real poles 0.1 Hz. 
- The 328.7 Hz is the new f_c, and we retain the same high-frequency roll off of 7000 Hz.  
- The gain of gain(9574.81) which is the correct normalization gain to get the over-all gain to be unity at 100 Hz, which is the frequency at which I matched the no-detuning gain of the (unused) 329:7000 filter in FM3.
The attached PDF shows that the ER9 gains agree between detuning and no detuning, and as expected, the overall optical gain is ~20% lower that O1 because we've not yet digitally compensated for the ~20% lower optical gain (because of 20% lower PRC gain; see LHO aLOG 28133) in the DARM loop.


Further Discussion on why I've only updated the Sensing Function:
All actuation strengths are within ~5% of there O1 values (see LHO aLOG 28130), and we've compensated all electronics better (see LHO aLOGs 27180, 27150, and 28087), so we need not update anything in the actuation chain. Rana and Evan H. have changed the local, top-mass damping loop filters for the QUADs, so nominally the QUAD dynamics have been changed, but that should be a small effect in the GW band. We'll update for O2, but no need for ER9. There have been several changes to effects at high-frequency, but all of those are covered in the GDS FIR filters which absorb the CAL-CS output and acausaly correct for these super-Nyquist frequency effects.

Carlos, Jim

After installing Ubuntu 12 on h1tw0 and performing a file system check, the h1tw0 is now writing minute trend files.

Rana, Evan

WE measured the SRM to SRCL TF today to find the frequency and Q of the internal mode. Our hypothesis is that the thermal noise from the PEEK screws used to clamp the mirror into the mirror holder might be significant contribution to DARM.

The attached Bode plot shows the TF. The resonance frequency is ~3340 and the Q ~150. Our paper and pencil estimate is that this may be within an order of magnitude of DARM, depending upon the shape of the thermal noise spectrum. If its steeper than structural damping it could be very close.

"But isn't this ruled out by the DARM offset / noise test ?", you might be thinking. No! Since the SRCL->DARM coupling is a superposition of radiation pressure  (1/f^2) and the 'HOM' flat coupling, there is a broad notch in the SRCL->DARM TF at ~80 Hz. So, we need to redo this test at ~50 Hz to see if the changing SRCL coupling shows up there.

Also recall that the SRCLFF is not doing the right thing for SRM displacement noise; it is designed to subtract SRC sensing noise. Stay tuned for an updated noise budget with SRM thermal noise added.

** see  https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=27455  for pictures of the SRM compsoite mass.