Last week (Sept. 30th) I set CP4 in manual mode and doubled the LLCV to double nominal value (up to 66% open). Fill from 92% to 100% full took about 17 min. and another hour to see LN2 spew out the exhaust. Then I set LLCV back to nominal 32% open (actually slightly less than nominal probably given the level of the Dewar) to see how long it would take to boil back to 92% full. Answer is ~ 26 hrs. 

Today I remembered to set the CP4 PI lower limit setting back to 20% (important when Dewar gets filled).

2:30pm local

20 sec. to overfill CP3. Left bypass exhaust valve open.

Next fill due Wednesday.

* PSL down all shift for troubleshooting *

15:09 UTC Jeff B. opening rollup door between cleaning and receiving area
15:48 UTC Jim B. taking down h1lsc0 frontend to allow Filiberto to turn off IO chassis. (WP 6197)
16:13 UTC Ed starting WP 6198
16:24 UTC Filiberto done
16:33 UTC Filiberto to end Y EE room to look at remote reset for STS2 seismometer. (Hugh reports it is not working)
16:40 UTC Jeff B. starting check of dust monitors in LVEA
16:42 UTC Cheryl to TCSY table to check for water leaks
16:43 UTC Betsy starting ESD charging measurements on both ETMs
16:51 UTC Peter to PSL rack to look at connectors and signals related to chiller
16:59 UTC Hugh going to ITMX for CPS work (WP 6207)
17:05 UTC Jeff B. moving to end Y (compressor room and VEA)
17:15 UTC Gerardo to LVEA to check TCS chiller pipes for water leaks
17:16 UTC Richard transitioning LVEA to laser safe
17:19 UTC Filiberto's work on STS seismometer at end Y tripped ISI. Jim W. turned off sensor correction. Betsy restarting ESD charge measurements.
17:29 UTC LVEA transitioned to laser safe
17:29 UTC Jeff B. moving to end X (compressor room and VEA)
17:37 UTC Hugh back to ITMX
17:37 UTC Cheryl done, checked both TCS tables, no signs of water.
17:47 UTC Betsy turning TCS laser back on (tripped, cause unknown). Holding off on charge measurements due to multiples ISI trips at both end stations
17:53 UTC Jamie starting guardian update (WP 6208)
17:54 UTC Gerardo done
17:59 UTC Ed done
18:06 UTC Jeff B. done
18:12 UTC Hugh to end Y to look at CPS
18:22 UTC Chandra going for jog on X arm
18:28 UTC Filiberto done
19:04 UTC Peter and Jason breaking for lunch
19:52 UTC Betsy restarting charge measurements
20:19 UTC Peter and Jason back to LVEA PSL racks
20:34 UTC Hugh to LVEA to check CPS for BS
20:52 UTC ETM charge measurements done
20:55 UTC Chandra to mid Y to fill CP3
22:00 UTC Betsy to optics lab
22:05 UTC Vern to LVEA to check on Peter and Jason
22:50 UTC Photographer for Science magazine through gate

Forgot to log time: Karen and Christina to LVEA to swift

Since the PSL was being worked on this morning, I took the opportunity to take the ETM charge measurements so that we don't have to take up time tomorrow.  The coherence data looks good, however NDS is whining about something and won't let me produce the long trend.  Show me the money!

Soooo, TBC...

(Note, I had to restart the measurements a few times this morning since the ISIs kept tripping unexpectedly with expected SEI work.)

I updated the lockloss tool to take advantages of some features of the new guardian release.  It can now find lockloss times over the last two days faster by using NDS instead of guardlog to look for the times.  The log display is also fixed.

Also included is a zoomed view of the OSC-DCHILTEMP channel which shows periods of oscillations. THought this may be of interest. Not much out of the ordinary otherwise, barring the excessive trips.

I upgraded guardian to v1.0.2, which is a minor upgrade to fix a couple of small issues and make some small UI improvements:

• fix to medm --states screen
• fix NDSSERVER env var parsing error
• fix guardutil archive-clone checkouts, open gitk by default
• fix guardlog time parsing issues, better server error handling
• include state indices by default in graphs opened from medm screens
• improved ability to edit individual code objects

   Did quarterly Zero Count and Flow Testings for the vacuum connected dust monitors. NOTE: Did not go into the PSL enclosure. Will check these dust monitors on next PSL entry.

   All monitors were Zero Count. Had to run the Zero Test a couple of times to clean and zero the dust monitor at HAM6. 

   All monitors are with in flow range (2.8l/m +- 5%). The flows on the dust monitor at HAM6 and in the Biergarten are a bit on the low side. Will check the trend on the next inspection, and adjust the flows as necessary. 

   All vacuum pumps checked out: temperatures all <150f and vacuum readings with in range (19inHg +-5%). Made minor by-pass flow adjustments on the CS and End-X vacuum pumps.     

WP 6207

Nutsinnee plotted the CPS sensor noise and we see there are a few with elevated levels. So this morning we unplugged the probes and unseated/reseated all the corner3 cards several times.  The St1 noise on H3 cleared up but the Stage2 H3 was still noisy.  So, returned to the floor and reseated St2H3 card several times.  Now it seems much better--see attached.  The low frequency noise (below 20 Hz) is from the stages not being isolated.

Gerardo and Vern

TCS-X: Full no water added, 3.9 gal/min, 20.0 deg C.

TCS-Y: found water level to be 6.6, added 750 mL to raise gauge to 8.6, 4.0 gal/min, 19.8 deg. C.  Unusual fill pattern, first 500 mL showed no sign on gauge then suddenly the gauge ball droped to 5.0 and climbed with the addition of the last 250 mL of water.

Noticed the icons on the two chiller control panels were different. TCS-X displayed horizontal bars. TCS-Y displayed chevrons pointing up. 

I have done a cross correlation analysis of the two OMC DCPDs in order to study the spectral shape of the broad band noise that has been limiting the sensitivity in 200-1000 Hz band. Here are some results.

The red curve is cross-correlated noise of the two DCPDs in terms of the DCPD current in mA (with DARM loop effect removed).The data I used is a lock stretch from Sep. 26th which lasted for 6 hours in undisturbed. The frequency resolution or bandwidth is set to 0.1 Hz. The data length is 3 hours starting at 9:00:00 UTC of the day. The DARM suppression is taken out from OMC DCPD SUM. I have used the latest PreER10 DARM model (29931) to obtain a reasonable DARM suppression function. As we all know, there is high noise in 200-1000 Hz whose level is as high as shot noise (or null stream shown in green) in this frequency band.

I also made another plot, which is an overlay of 11 cross correlated spectra each of which is from different time but from the same lock stretch. See below.

This time, the frequency resolution is set to 1 Hz, so that we can get several FFTs out of the same lock stretch. Each spectrum is produced by an 18 minutes integration. As shown in the plot, there was one spectrum which is polluted by some kind of glitch. Otherwise, the shape of noise stayed almost unchanged over 3 hours. Also fig files are available.

Here is a frequency noise coupling transfer function during tonight's lock.

I calibrated REFL9 into watts using a the factor 2900 V/W (from the diode to the output of the demodulator) and 12 dB, −21 dB, and 2 V/V for the analog and digital signal gains.

If the loop is shot-noise-limited (with 4.6 mW on the diode), this implies a noise of about 40 pW/Hz^1/2. This would imply a noise in DARM that is more than a factor of 10 below DARM shot noise.

I have created a new GDS calibration FIR filters file.  The included filters are designed to correct output of the front-end CALCS calibration, improving accuracy at high frequencies on ~10% level.  This new filters file contains more aggressive high-pass filters with a cutoff of 9 Hz and contains accurate values for EP1-9 for use in the kappa calculations.  The new filters file can be found in the calibraiton SVN:

aligocalibration/trunk/Runs/PreER10/GDSFilters/H1GDS_1156183417.npz

This filter was created using calibration SVN version #3295 and following instructions outlined here.

Attached are plots of the corrections applied to DELTAL_RESIDUAL and each of the DELTAL_CTRL_PUM/UIM/TST/ channels (all DELTAL_CTRL_* channels receive the same corrections).  Attached are also plots comparing the h(t) spectrum for some ER9 data (1152076416-1152076544) calibrated using this filters file with output of the front-end CALCS model.  The agreement is at the expected level given the corrections include in the GDS filters.