Laser Status: 
SysStat is good
Output power is 27.5 W (should be around 30 W)
FRONTEND WATCH is Active
HPO WATCH is red

PMC:
It has been locked  d, 11 h 40 minutes (should be days/weeks)
Reflected power is 1.2 Watts  and PowerSum = 11.0 Watts.
(Reflected Power should be <= 10% of PowerSum)

FSS:
It has been locked for 0 d 0 h and 3 min (should be days/weeks)
Threshold on transmitted photo-detector PD = 0.56 V (should be 0.9V)

ISS:
The diffracted power is around 12.4 % (should be 5-15%)
Last saturation event was 0 d, 0 h and 2 minutes ago (should be days/weeks)

   On Monday 04/145/2014 We partly removed the soft covers on the North and South door of HAM5. Particle counts before the covers came off were generally zero, with an occasional 1 to 20 counts in the 0.3 and 0.5 micron range. I took several counts inside the chamber. Most were zero, which occasional spikes in the 100 0.3 micron range. I did see one spike with over 500 0.3 micron counts, and corresponding lesser counts in the larger particle sizes. These counts cleared within a few minutes and return to the normal ranges.      

I installed the latest OS updates on the digital video camera servers, and also did some minor updates to the EPICS IOC processes, as specified in WP4566.  No issues, other than a typo that took a little time to track down that prevented the settings from being automatically restored (fixed).

we don't know why, it is windy out.  Sensor correctioin was off

We are trying Tcrappy

Here are spectra of the ETMX and ITMX oplevs.  All blends are on Tbetter, sensor correction was on for ETMX and off for ITMX. 

We are bothered right now by large amplitude motion (around 1urad pp) in yaw at very low frequencies.

I was setting the stage 1 blend filters (one at a time and slowly like we were instructed to), and the ISI tripped due to the ACT limit.

These plots show that it is possible to completely damp out the fundamental L and P modes of the quad, that are causing the cavity pain. The damping method here is called 'full state feedback'. It is like modal damping in that it uses an estimator to compensate for a shortage of sensors around the quad. However, the controller is a matrix rather than a set of filters. The advantage of the matrix feedback is that you can solve the matrix for a set of desired closed loop poles. So here I have specified that the first two modes will have a Q of 0.67 in the closed loop. The others I specified between 10 and 50.

The price you pay for this controller is absolutely terrible noise performance. Also, it is not AC coupled. But, if the RMS test mass motion is a real problem for the cavity, this can be used to suppress it.

The hydrogen outgassing rate measured is 75% of that measured in 2000. The atmospheric accumulation is about
6.9 x 10^-8 torr liters/sec and seems high relative to that in y1 and the accumulations made at LLO. The value suggests
a small leak. If this is in the beamtube it is at the threshold of not being able to be found with our
current techniques.

The results of the accumulation were more difficult to calculate and have more uncertainty due to the method of 
connecting the RGA to the beamtube. The connection was made by a corrugated small diameter tube rather than a mount
directly on the beamtube. The pumping speed of the tube and the pumping speed of the RGA as an ion pump need to
be accounted for. The attached pdf file shows the influence of the connecting tube and presents the results.

[Kyle Sheila Arnaud]

This evening, we took a close look at the ETMY optical lever spectra, which showed interesting features in the pitch and yaw signal, as well as in the sum, (cf first screenshot)
Thinking it might be due to the laser, we went down to EY, and tried recycling it, but unfortunately it didn't change anything (red and blue = before, brown and pink = after). Maybe we should try the same thing with the electronics.

Second attachement shows the current difference between EX and EY in the oplev pitch. EY signal still looks very noisy from 1Hz certainly because of the current ground activity (fans, pumps...)

Finally, this morning Kyle turned off the turbo vacuum pump to make sure it was causing the 29.57Hz peak in the ISI T240 and the oplev spectra. Third attachment shows difference on/off (orange ON, purple OFF) in the oplev pitch spectra.

There was no clear reason for this trip, no one was in the lvea at the time.

Sheila, logged in as Alexa

No touching.

I started this last week, finished it today. Not going to give a lot of details of the measurement, but we drive the ISI hard at low frequency in one direction and adjust some cps align elements until a hooked line becomes mostly straight. This will give us some gains in the low frequency region. St2 still needs to be done, but should go relatively quickly. Also need to add sensor correction, which I'm starting to look at right now. Posting a screen of the St1 cpsalign values here for posterity.

I went back to the end station today to look into the beam quality.  At Keita's suggestion I put a retro reflector in to look at the beam without having to worry about what happens in the chamber.  With the retroreflector after the last steering mirror on the table, I set up the nanoscan in the path to WFS B and the thorlabs beam scan in the path to the HWS, whic doesn't double pass the Faraday.  Using the two profiles, I tried to move the Faraday around to find a position where both the beam in the HWS path  (the first pass beam) and the beam in the WFS B path (double passed) were good.  Although there were many positions that gave a good beam after the single pass, I didn't find anything that gave a nice gaussian profile in the rejected path.  I swapped the Faraday with a simliar one, and the beam quality was immediately better.  With a small adjustment I found beams that look guassian in both the WFS path (measured at 3 different positions) and the HWS path, using the retroreflector.  Reflecting off the ETM the beam is a little bit worse, but still bassically a guassian beam.