WP 5984--Addressing a couple month old bug, see SEI log 989 for details.  Summary: We had added a condition to turn off Damping if a platform trips but this code is common for HEPI and the ISI and the HEPI does not have a damping state so there was an error.  This was reverted and Friday Arnaud added a conditional to the code that excluded the HEPI from this action; it was tested at LLO.  I've updated the python code and restarted all the HPI nodes--no impact to the platforms.  See attached for keystrokes.  WP closed.

Diodes 3/4 are seemingly kaput.

Came in to find the laser was off due to the power watchdog being tripped.
Both chillers were still running.

I have turned the laser back on but it hasn't returned to where it normally
returns to.  Looking into what happened.

The beam position on the test masses is estimated from the a2l gains from the last minimization (method explained in alog 22426)

The gains values before and after the mimization are attached in a2l_gains_1151366417.mat.
The corresponding beam positions are reported in each suspension base in the Fig.1 attached. We can see that the beam is not more off-centered than previously.

However, we can observe that the beam hits the ITM and ETM in differents vertical places now in each cavity, suggesting an increase of the beam tilts in PIT with respect to the optical axes (HARD PIT).
That is what I tried to represent with the projection in Fig. 2, where you can imagine the cavities facing you: the figure axis orientation is the ETMs coordinates orientation.
The YAW tilts are reduced in both cavities. But their directions were opposite before the a2l minimization whereas now both cavity axes have a negative YAW tilt (in the ETM coordinates).

I don't know when the script was run for the last time before that, but it could give an indication that the beam is now more tilted in HARD PIT at 40W, and it enters the cavities from the lower area of the ITMs. 

Sheila, Jenne, Haocun

We took measurements on the C/DHARD yaw Loops with low bandwidth last Friday.

We firstly turned on the new filter to move compensation peaks for C/DHARD Yaw, then turn off the boost to win more phase. The gain was then lowered to ~half (CHARD_Y: -0.7 ---> -0.3, DHARD_Y: 40 ---> 19), and the new cutoff filters can be turned on.

These steps has been added in the Guardian, and we took measurements with the low noise loop, as attached below.

Both of the UGF are about 3.5Hz at 40 W now, which were ~5Hz before.

Engineering Run 9 (ER9) will begin next Wednesday. Here are some important details for operations:

• ER9 begins Wednesday July 6, 2016 8:00am PT, 15:00 UTC, 1151 852 417 GPS
  
• ER9 ends Friday July 8, 2016 23:59 PT, July 9, 2016 6:59 UTC, 1152 082 757 GPS
  
• Target input laser power: 40W operation. (This may be adjusted to deal with PI modes and to optimize observing time.)
• Only the H1 interferometer will be operational (a vent is on going at LLO)
• "Simulated" data for L1 and Virgo
• July 5th Maintenance:  A maintenance day will precede ER9 next Tuesday. Please consider the interferometer and its controls under a code freeze until after ER9.  Our focus is to have a stable,  running H1 for ER9.
• Plan for use of the calibration pipeline and DMT code running under SL7, with a fallback plan to run under SL6 if necessary.
• ER9 Daily Telecon:  Wednesday through Friday at noon PDT, 19:00 UTC, there will be ER9 Operational Status Telecons on the JRPC TeamSpeak channel.

Please see https://wiki.ligo.org/LSC/JRPComm/ER9 for more details.

Filled CP3 at ~ 1:50 UTC , 6:50 PM LOCAL Time Sunday.

Opened valve 1/2 turn and observed liquid after 5 minutes, 15 seconds. Windy on site.

Tried to use PRC1 input offsets in pitch and yaw ro recover recycling gain, instead of SOFT imput offsets. While the carrier recycling gain responds to PRC1 input offsets similarl to soft offsets, the POP_18 couldnt care less. Thus I suspect none of these offsets is able to tackle the core issue.

The next thing to do is to verify that the POP18 signal is actually trustable, and not saturating,  If trustable, it will be the best indication of recycling cavity losses.

TITLE: 07/02 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY: Commissioning continues. We have been sitting at NOMINAL_LOW_NOISE now for  1.5+ hours.
LOG:
fw1 has had at least a couple of restarts

Lost about 9.5hours on all DMT monitors.

23:40 - Gerardo to CP3

00:04 - Gerardo back.

Spent some time pulling together calibration numbers for AS, REFL and POP diodes, and makeing a total power budget.

Bottom line:

- The missing 20% power (8Watts!) is not coming out of any port, and thus must be absorbed in the interferometer.
- The way to distinguish loss in the recycling cavity and (280 times smaller) loss in the arms is to look at the sideband recycling gains.

Attached is a plot of power at each port, plus the power in the recycling cavity cast into cumulative arm loss (by multiplying with 279 power buildup and 95ppm round trip losses). Note that there is virtually no increase in AS power, and even a decrease in REFL power. the 8 missing Watts are absorbed in the interferometer.

Note that it is very difficult to distinguish arm losses from PRC losses using the carrier. However the two cenarios are very different for the sidebands - for arm losses both sideband hardly see anything. However, for PRC losses, the 9MHz sideband responds quickest, since it starts off with a hight recycling gain. The 2nd attached plot illustrats this. My money is on PRC losses.

The signals I picked for calibration are:

'H1:LSC-REFL_A_LF_OUTPUT':
0.1*0.5^3*(1-800e-6)^3*1000 = 12.47  mWatt REFL (=cts) / Watt from IFO
10% beam spplitter
two 50% beam splitter
three 800ppm loss mirrors
50% beam splitter
1000mW/W

'H1:LSC-POP_A_LF_OUTPUT':
229e-6*0.1*1e6 = 22.9 uWatt POP (=cts) / Watt in PRC
229 ppm of PR2
10% beam splitter
1e6uW/W

'H1:ASC-AS_C_SUM_OUTPUT':
0.965*800e-6*0.48*0.8*997*10^(36/20)*1638.4 = 3.0554e+04 cts / Watt from SRM
0.965 Faraday transmission
800ppm transmission mirror
48% beam splitter
0.8 Quantum Efficiency
997 Ohm transimpedance
36dB whitening gain
1638.4 cts/V ADC
Note: This calibration has the most estimate factors in it. I don't rust it better than ~25%.

'H1:OMC-DCPD_A_OUTPUT' & 'H1:OMC-DCPD_B_OUTPUT':
0.965*(1-800e-6)^2*0.99*0.93*0.5*0.85817*0.9*1000 = 343 mA / Watt carrier 00 mode from SRM
0.965 Faraday transmission
two 800ppm loss mirrors
1% loss mirrir
93% OMC transmission
50% splitter
0.85817 A/Watt ideal
90% Quantum Efficiency (is this right?)
1000mA/A

I broke lock turning the ETMX ESD low pass filters on.  I put them on as I had a feeling that this help PI damping yesterday and the ETMX 15541Hz mode was out of control and would broken lock.
We have now put this change into the LOWNOISE_ESD_ETMY gaurdian state along with the request for the ETMX_PI_DAMPING state from the SUS_PI gaurdian. 

Between yesterday and today, Gerardo and I successfully bonded the ears to core optic mass ETM15, destined for LLO for post-O1 eventual replacement. 

Ear s/n 195 bonded to S3 flat of mass June 29, 2016

Ear s/n 196 bonded to S4 flat of mass June 30, 2016

The first ear (s/n 195) has a series of bubbles along it's edge, but the surface area of these do not add up to more than the allowed amount as per E1000277, so it passes, see pix attached.

The second ear (s/n 196) has no bubbles and is nice full bond. 

Richard, Filiberto, Ed, Betsy

Following on from Andy's probing alog 27841 regarding funny looking OSEM spectra, today we looked into a few fishy signals.  Based on spectra he took from before and after the early June power outage which show signal changes, he and Jenne identified the following set of problematic OSEM signals.  I've annotated the list with status as to what we found or fixed today:

ITMY L2 LR - Fixed after power cycling the Satallite Amp box (see alog below)

ITMY R0 RT - Signal looks funny before power outage, old problem, TBC...

MC1 M3 UL - Signal looks funny before power outage, old problem, TBC...

PRM M2 UR - Fixed after power cycling the Satallite Amp box (see alog below)

PR2 M1 T2 - TBC...

PR2 M3 UL - Giant nominal YAW Bias which has been on this SUS for over a year - very little signal on OSEM - mechanical fix when vent

PR2 M3 LL - Giant nominal YAW Bias which has been on this SUS for over a year - very little signal on OSEM - mechanical fix when vent

SR2 M1 LF - Funny comb feature, TBC...

SR2 M1 T1 - Funny comb feature, TBC...

SR2 M1 T3 - Funny comb feature, TBC... 

ETMX L2 LL - 50Hz turn up noise, TBC... Turn up is due to LOCK ACQ PUSHING, turn up not present during nominal SUS damping, no LOCK ACQ, see below plot

ETMX L2 LR - 50Hz turn up noise, TBC... Turn up is due to LOCK ACQ PUSHING, turn up not present during nominal SUS damping, no LOCK ACQ, see below plot

ETMX L2 UR - 50Hz turn up noise, TBC... Turn up is due to LOCK ACQ PUSHING, turn up not present during nominal SUS damping, no LOCK ACQ, see below plot

ETMY L2 UR - 50Hz turn up noise, TBC... Turn up is due to LOCK ACQ PUSHING, turn up not present during nominal SUS damping, no LOCK ACQ, see below plot

IM3 M1 LL - TBC...

We plan to pursue ITMy R0 and SR2 this week at next opportunity.