PSL Status: 
SysStat: Green 
Output power: 33.7w  
Frontend Watch: Good
HPO Watch: Red  

PMC:
Locked: 5 days, 1 hours, 31 minutes
Reflected power:    2.1w
Power Transmitted: 23.2w 
Total Power:       25.4w 

FSS:
Locked: 0 days, 0 hours, 25 minutes
Trans PD: 1.802v

ISS:
Diffracted power: 8.779%
Last saturation event: 4 days, 18 hours, 43 minutes  

here is a summary of the recent windows issues we had with the Beckhoff IOCs. At today's slow controls meeting we found that the alog record was incomplete.

Thursday 28th August, 03:15PDT. h1ecatx1 rebooted after auto update. h1ecatx1plc2 came back up with bogus EPICS values. System was rebooted. Details in alog.

Tuesday 2nd September, 07:05PDT. h1ecatx1 stopped running, all EPICS data frozen. A restart was made late morning which only ran for a few minutes. System was restarted again later in the afternoon and made statble.

Attached is a plot with the HAM5 CPS magnitudes from July 18 (at air HEPI locked) and from 6 Sept when we are under vacumm and the HEPI has closed position loops.  The things we believe are SUS resonances are cleaner now and the HEPI structure modes are lowered in frequency and Q. 

The feature just below 6hz is decidedly softer than the one seen on WHAM4--see comparison in the second attached plot.  All these 'HEPI' features are positioned/shaped differently between HAMs 4 & 5.  Maybe this is external mechanical and I should give everything a good hand-on look-see.

~0915 - 0930 hrs. local 

The HAM6 turbo and its scroll backing pump were accidentally de-energized this morning resulting in the maglev turbo "crashing" onto its emergency bearings -> Chris M. was cleaning the floor near where the pumps were plugged in and accidentally tugged/shifted the shared power cord causing it to lose electrical connection -> I was in the LVEA at the time and heard the "characteristic" sound of the non-levitated turbo spinning down from 48,000 rpm on its unlubricated bearings (not unlike a steel garbage can full of rocks rolling down a steep hill) -> I was able to isolate HAM6 while the rotor was still spinning -> Both of the in-series foreline safety valves worked as intended and the scroll pump was isolated upon the loss of AC -> I was able to restart the pumps without difficulty and was able to resume pumping after ~15 total down time -> HAM6's pressure was perturbed with the loss of pumping and saw a pressure rise from 1 x 10-6 torr to 6.5 x 10-6 torr while the pump was isolated  

This is the second "crash" of this turbo due to loss of power.  This first happened years ago and was also the result of a "wiggled" power cord.  Back then the power cord to the pump cart was removable via an unreliable 1/4-turn twist lock connector.  As a result of this first crash the twist lock connector was abandoned in favor of permanently terminating the cord internal to the cart's control box.  

Note to others:  

Are energized PZTs in HAM6 vulnerable to rough vacuum?  If so, are there protection systems?

There are a few features in the ISI TFs around the resonances of HAM5 but not seen on HAM4.  Jeff suggested TFs with the SUS off.  Attached is the result.  The only thing that stands out without deeper study is a small feature at ~1.5hz on V1.

I reran the TFs completed Saturday but with only 1/4 the averages and just between 0.5 & 5hz.  And, Kiwamu turned the SUS damping back on for the last 15 minutes or so.  This should only affect the V3 results.

Sheila, Alexa, Kiwamu

Even though we swapped the oplev laser for BS recently. The BS optical level laser power started showing another power modulation, which resulted in kicks on BS through the damping loops.

For now, we recentered the beam on the QPD to reduce the intensity coupling.

The power modulation looks more like a step which randomly shows up as a function time as shown in the attached screenshot. The modulation depth is roughly 1%. This was actually big enough to cause BS angle agitation which was visible at the dark port digital camera. The coupling seemed bigger in the horizontal direction presumably due to a bigger off-centering in the horizontal direction on the QPD. After the re-center, the coupling seemed to have become lesser, but it is still kicking BS in its angle. This needs to be fixed.

Alexa, Kiwamu ( a report from this past Friday)

We started checking out the REFL WFSs again. The misssion of the day is to engage the DC centering servos and check out the demod phases.

(REFL WFS DC centering servos)

We applied some modifications on the DC centering servo so that the servo basis REFL_A and REFL_B QPD signals. This had been adjusted to be some other basis (alog 9966), but we wanted a simpler basis. The attached is a screenshot of the new centering servo configuration. The input matrices are simple diagonal matrices so that the servo basis is simply REFL_A and REFL_B. In order to actuate on those basis through RM1 and RM2, we did some algebra based on the number reported in the previous alog (alog 9966). After the adjustment, we tuned up the gains to have a few second impulse repose time scale in every servo loop. Also, the sign of the output matrix were chosen such that all the servo gain consistently has negative sign.

(REFL_A_RF9 looked not great)

While we could easily re-adjust the demodulation phases on REFL_B_RF9, we could not perfectly adjut the demod phase on segment 1 of REFL_A_RF9. In addition, segment 4 of REFL_A_RF9 showed no reliable signals. This looked as if a cable was unplugged or something. Indeed the noise floor of segment 4 was lower than everyone else. We need to check REFL_A_RF9 at some point.

We did not check RF45 because we ran out the commissioning time.

   With installation ramping down, Vern will be chairing the morning meeting for the Detector Group. Meetings will be on Monday, Wednesday, and Friday, starting at 08:30.

OpLevs – Need laser safe to continue work on HAM5. 
               Ongoing alignment and problem resolution work at ITMX and ITMY. 
               Glitches with the BS OpLev laser are being looked into.

Seismic – Continuing work on ITMX control loops stability.
                Commissioning on the various HAM HEPIs.
 
Electrical – Pulling cables and power distribution configuration in the LVEA. 
                  Work on the Chiller 3 tripping problem. 
                  Reconnecting Staging Building fire system to the alarm distribution panel in the OSB 
		 

Some features in TF we'd like to confirm are SUS peaks.  Will desist if needed.

model restarts logged for Sun 07/Sep/2014
2014_09_07 12:28 h1fw1

unexpected restart of h1fw1

no restarts reported

The matrices described in 13703 were installed. This caused a noticable improvement in the shape of the QPD alignment OLGs. They are now more clearly a clean 1/f shape.

I also tuned the OMC LSC demod phase and set the gain for a 80Hz UGF. (This was done by opening the LSC loop and sitting on the side of a resonance and tuning the phase until the Q signal was 0)

Nic, Jamie, Lisa

With the QPD alignment engaged, we did a scan of the OMC in ITMY single bounce configuration. Data are being sent to Koji right now for a careful analysis, but our rough estimate is that indeed the matching to the OMC is around 90%, so slightly better than for ITMX, as expected. 

Scan data: Sep 9, 2014 21:10:08 - 21:12:00 UTC

no restarts reported

Alexa, Sheila, Kiwamu, Nic, Jamie, Lisa

After some ITMX ISI work, PRY initial alignment work and more Guardian work, variable finesse technology has been used to bring the PRMI close to the dark fringe. This time the normalization of the error signals is done with POPAIR_A. The success is only in principle because once we arrived at the final step to transition to RF for MICH, an earthquake sadly hit us..the bad timing of this earthquake is unbelievable (#%$#&*&!). 
The positive news is that with this new alignment the recycling gain is somewhat higher than before. We don't have precise measurements because we haven't really locked stably on the dark fringe yet, but we think we had a recycling gain around 10 at some point during the MICH offset reduction sequence when the alignment was good.

Jim's ITMX ISI measurements are about to start, and they will last until tomorrow around lunch time.