Richard told (or reminded) us this morning that the resonant circuit of the RFPD for locking the IMC had been adjusted for 21 MHz rather than the actual modulation frequency of 24 MHz. So I went ahead to the IOT2L optical table and measured the RFPD response using the AM diode laser. As shown in the attached figure, the RFPD is indeed configured for 21 MHz. Because the resonance at around 21 MHz is so broad, 24 MHz is well within the resonance with a slightly bigger response than 21 MHz by a few dB. The notch seems to be adjusted to 42 MHz. The ratio of the response at 48 MHz over 24 MHz was found to be about -20dB.

The raw data is also attached.

We are working several issues at the moment, here is an executive summary:

bogus second trend data: Some vacuum channels were showing bogus data in their second trends if data over Thursday lunchtime's DAQ restart is requested. Work around is to ask for data up to and beyond the restart time.

BACnet EPICS FMCS data froze around 1pm Sunday (fixed by restarting code)

CP3 overfill did not proceed, thermocouples out of -20C to +40C range (mid 40C). Code will be changed to increase upper limit to 60C. WP6649

Air compressors were turned off at both end stations, Alarm system reconfigured to ignore these channels (WP 6647)

Jeff K. reported that the FMCS channels at end Y had flatlined. I restarted the IOC and they seem to be updating again. I do not yet know why. I burtrestored to 6 AM local on May 20.

Reference alog: 6294

FRS8170

Jonathan, Dave

The DAQ was restarted at 19:06 Thursday 5/18 UTC (for vacuum controls IP6 work). If an NDS1 request for second trend data for certain channels is sent which spans the restart time, then the data preceding the restart is correct, but post data is bogus. In the case of H0:VAC-EY_Y3_410_PIRANI_INTLK, data at the tail end of the 19:00-19:10 second trend file is a static 2.2, and from 19:10 onwards is a noisy 2.2

We conclude that only the second trend frame from 19:00-19:10 is suspect. Both framewriters wrote the same frame, both nds servers show the same issues if spanning this frame. Investigation continues. I've saved the frame and its md5 file under h1nds1 control's homedirectory (dave subdirectory).

-rw-r--r--  1 controls controls 434M May 22 11:27 H-H1_T-1179169200-600.gwf
-rw-r--r--  1 controls controls   33 May 22 11:27 H-H1_T-1179169200-600.md5

After making sure all the view ports on HAM1,2, and 3 are covered (all the ones that Robert could have used), I opened the PSL light pipe for commissioning work. The LVEA is still LASER SAFE.

Starting CP3 fill. TC A error. TC B error. Fill aborted.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 2620 seconds. TC B did not register fill. LLCV set back to 36.0% open.

WP6647

Bubba, Dave:

The end station instrument compressed air signals from both EX and EY were removed from the cell phone alarm system. Two channels per building, the signal channel and its error channel. Alarm system was restarted at 11:24 PDT.

Kyle 

(Tasks part of WP #6644)

~1015 hrs local -> I valved-in the Vertex RGA to the combined vacuum volumes of the Vertex+YBM+XBM while these volumes were being pumped by their respective turbo pumps.  PT120's response is attached (1 hour of second data).  "From my head" 10-9 torr/10-5 L = 10-4 torr/L of gas accumulated in the unpumped ~5L RGA volume in 14 days?  So, no significant air leaks in the RGA joints.

~1045 hrs. local -> I energized the Vertex RGA filament (note: I am confused with the Pfeiffer software's naming of my connect/scan session with the included phrase "Airdemo..".  The other versions of this software don't do this and I makes me question as to whether I am actually connected to the Vertex RGA (h0rgacs) or am I connected to their "Simulator" or virtual RGA in this connect/scan session?  

Laser Status: SysStat is good Front End Power is 33.98W (should be around 30 W)

HPO Output Power is 165.2W

Front End Watch is GREEN

HPO Watch is GREEN

PMC: It has been locked 5 days, 23 hr 12 minutes (should be days/weeks)

Reflected power = 16.97Watts

Transmitted power = 62.97Watts

PowerSum = 79.94Watts.

FSS: It has been locked for 3 days 18 hr and 40 min (should be days/weeks)

TPD[V] = 2.846V (min 0.9V)

ISS: The diffracted power is around 2.7% (should be 3-5%)

Last saturation event was 5 days 4 hours and 57 minutes ago (should be days/weeks)

Possible Issues:

Nothing unusual to report.

The HVAC controls upgrade install has been completed at both end stations, therefore I have turned off the air compressors at both end stations. Sorry for all the alarms.

Note that the tour that I had scheduled (see WP #6641) is canceled.

At some point, I expect to be in the LVEA, the VPW, the Control Room and my office.  I expect to be here approximately 2 hours and will make a comment to this entry when I leave.  

J. Kissel, NOVA Film Crew

I've modified the main displays on the front wall at the request of the NOVA film crew. The lower screen is displaying the GW150914 waveform and the background of the DTT session showing the Live Sensitivity on the Upper screen has been changed to black.

There is zero intention of this being permanent, but I figure there will be no harm in leaving it as such over the weekend since the content normally displayed on these screens only has meaning when we have light in the arms, no one is intending to commission the corner station over the weekend, and there'll be no operations specialists on shift over the weekend. So, it should just be the film crew, Dr. Levin, and their site liaison, and they all want it this way!

I'll restore the displays to normal Monday.

Interesting pressure trends on X & Y beam manifolds. See my previous aLOG about rate of rise test followed by pumping on just turbos (IPs valved out). PT180 (y-arm) trend has shifted and headed up! Does this mean the fault is in IP6 and not a leak?