This morning all the valves that could be closed were closed to isolate the piping for tracking the very slow downward trend in the pressure. Since Wednesday afternoon there has been a drop of 3psi. This is way too much to be temperature related. Hopefully it will just be a loose fitting; wish me luck!
Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Feb. 14 to 5 PM Feb 15. Also attached are plots of the modes to show when they were running/acquiring data. Data was taken from h1nds0. 1440.0 minutes of trend displayed
Attached are power spectra of PRM for Phase 2b checking.
-Damping seems to be working looking at 2013-02-14_1500_H1SUSPRM_**_ALL_Spectra.pdf
-Comparison between PRM L1 Phase 2a (Jan 2013) X1 (Sept 2012) and H1 (Feb 2013) has been plotted for damping on and damping off
(allhstss_2013-02-14_Phase2b_H1PRM_ALL_Spectra_Doff.pdf and allhstss_2013-02-14_Phase2b_H1PRM_ALL_Spectra_Don.pdf )
**Frequencies of the main DOFs for M1, M2 and M3 are matching the model and L1 power spectras.
**An extra peak appears at ~5Hz on several curves from L1 (ex : allhstss_2013-02-14_Phase2b_H1PRM_ALL_Spectra_Doff.pdf --> M1_DAMP_L_IN1 on page 7). Noisier environment there ?
**The amplitude of some power spectra from H1 PRM is higher than the ones from L1 (ex : allhstss_2013-02-14_Phase2b_H1PRM_ALL_Spectra_Doff.pdf --> M1_DAMP_Y_IN1 on page 12), and most of them are higher at low frequencies.
A reason would be that the PRM was uncovered during measurements (figured out afterwards) and "wind" could have made it moving. Will run power spectra again to check this, now the cover is back on.
Ran new power spectra over the week end, to confirm why the low frequency amplitude was high on Thursday's PRM power spectra (2013-02-14). Now the suspension is covered again, the power spectra looks better. See one of the two first attached documents (allhstss_2013-02-15) comparing L1 PRM power spectra (Jan 2013) H1 PRM uncovered (Feb 14th 2013) and H1 PRM covered (Feb 15th 2013), the difference can be clearly seen.
**the data have been commited on the svn and can be found here :
/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/Data/allhstss_2013-02-15_Phase2b_H1PRM_ALL_Spectra_Doff.pdf
/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/Data/allhstss_2013-02-15_Phase2b_H1PRM_ALL_Spectra_Don.pdf
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PRM/SAGM1/Results/SAGM{1,2 or 3}/2013-02-15_1700_H1SUSPRM_M{1,2 or 3}_ALL_Spectra.pdf
**Only the "good" data (=Feb 15th 2013) will be added to the plotallhsts_spectra.m script. Will commit the script with new data right after this log.
Weekly trends. Next week we may need to increase the current on pump diodes 3 and 4 as they've dropped to 90% of their nominal value, and the output power of the 35W laser has dropped below 95% of its nominal value.
Kyle, Gerardo Replaced PT343B gauge head -> The 1.5" metal angle valve (in series with the 1.5" O-ring valve) was found to be over torqued (closed) as its depth indicator was "off scale" combined with the observation that nominal applied torque resulted in no perceivable stem rotation -> We couldn't demonstrate that this valve's over torqued knife-edge seal leaked appreciably after replacing PT343B -> the rate of pressure rise indicated by PT343B when isolated from the BT and the pump cart (while rising through the 10-6 - 10-5 torr range) did not change noticeably when the O-ring side of the re-closed metal valve was vented versus when it was under vacuum We helium leak tested all joints of X1-9 prior to opening to the BT (baseline 1.5 x 10-9 torr*L/sec) Note: the indicated pressure value is not calibrated -> we will use neighboring gauges/history to adjust new gauge when time permits
During the last few days of vent activity in BSC1 late last month for the ITMy alignment, I parked the BSC1 particle counter inside the chamber with us. Attached is a plot noting the events that the particle counter witness (thx, Justin!). Things to say about the plot:
1) The particle counter has small spikes to ~15 counts/cub.ft during the quiet nighttime hours while no activity was taking place anywhere in the LVEA. Note, we'll take a second monitor into the chamber during our next study such that we can confirm counts.
2) The highest counts seem to be during the soft cover activity. My guess is that the settled particulate in the chamber gets quickly stirred up by the soft cover (or has even collected in the soft cover since that is the direction of "out") and gets re-tossed around in the chamber.
3) There is a longer than expected ringdown of particulate counted for the hours after people have left the chamber and the soft cover had been restored to the door. It takes many hours for the particulate to settle back to the floor or horizontal surfaces after getting kicked up from traffic.
4) The overall counts of ~100 cnts/cu.ft are in line with what Robert reported in his in-chamber particulate measurement last month:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=2071
For the record, I wiped the flooring in the chamber as I exited the chamber (not shown on the plot), pulling from the far side towards the door with many IPA saturated wipes.
Below are pictures of the witness plates and optics which I left in the chamber under the ITMy and in the beam tube section just +y of the BSC1 chamber. There is also a picture us performing B&K Hammer testing of the ITMy which happens to show the placement of the particle counter (blac box with red dot on the elevated foil to the right of the ITMy).
Apollo got the doors off HAM2 and I followed with locking the ISI--no difficulties. I took a few photos, mainly focused on the cabling coming off Stage0 to the electrical feedthrus. Lot's of work to do in this department; the NW corner is pretty good but the others, not so much. The last image is from the East (right) side and shows the PR mirror's dummy masses that will need to be removed.
Minor administrative changes to hpi pump controller h1hpipumpctrll0, configured resolv.conf to allow other computers on network to be found by name, and started the ntp daemon to keep the time up to date. Time was reset to current time (it was off by a few minutes).
There were no unacknowledged alarms ringing this morning. Channels that were in alarm status were the following:
After a restart of the alarm handler, the two CPU-MAX alarms and the two IOP-SUS_B123 alarms returned (yellow).
late entry
As part of WP3715 I added a DAC output part to h1pemmx and restarted the model. This removed the "DAC not in use" flag but added in the "18bit DAC does not have an AI chassis connected" flag. Since the DAQ status went to 0x2000 (ini file change) I reverted the model back to the original for now rather than restart the DAQ. We will install the AI chassis for the PEM to green-up these systems.
Not a show stopper, but darn unfortunate for a variety of reasons. After installing the glass PR3, I noted that you cannot easily adjust the middle mass AOSEM positions. After a call to LLO to confer, I discovered that they reworked the brackets just before installation of their PR3! Fortunately they made 1 set extra, so it was overnighted our way. The unfortunate part is that I need to remove 8 silver plated screws from the awkward position on the inside of the cage over the optic, rework the bracket assemblies, and then reinstall them. The attached picture shows the "old" brackets - a circle indicates the captured adjutment screw.
A second set of modified brackets is coming to Betsy today. Janeen
Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Feb. 13 to 5 PM Feb 14. Also attached are plots of the modes to show when they were running/acquiring data. Data was taken from h1nds0. 1440.0 minutes of trend displayed
Go the Last two Corners Leveled today with help from Mitchell and Ed. I'll report tomorrow on position changes. HAM1 HEPI has now been relocked. I also spent a lot of time securing the electronics cabling. After one round of cleaning and bolt loosening, I found several of the L4C cables unplugged. They had not been secured, my fault, so I dressed and secured them much better than they had been.
Attached PR2 and MC2 power spectra for a safety check. Ran after some installation work on HAM2, where the ISI table have been incidentally moved and the optics might have touched the earthquake stops.
Richard fixed a short on the HEPI pump controller. The fire department was testing smoke detectors in the OSB and at end X. Dust counts in the optics labs were elevated as a result of tests in these rooms. Hugh worked on HEPI L4C leveling at HAM1. Dale took a group of college students from WSU on a tour, including into the LVEA. Apollo removed the rigid section of spool BE-3A. Hugo took pictures of HAM3 from the north side. Michael R. tested turning of an AC unit in the H1 PSL enclosure. Greg worked at HAM5.
We pulled the soft cover off the North side of HAM3, and took a series of pictues in the chamber.
These pictures will be used to asses the state of the ISI payload when we measured the ISI transfer functions for the Viton Pads Efficiency Investigation.
Cheryl, Hugo,
The attached .pdf file shows what was installed on HAM3-ISI as of yesterday, which is the configuration we ran the IMC test under. All the small optics mentionend in the top-level drawing are installed here
Deepak and Bubba report they're done for the day, so commencing Matlab TFs on PR3.
Data taken, apparently successfully, plots pending. Undamped: ^/trunk/HLTS/H1/PR3/SAGM1/Data/2013-02-12-1044746361_H1SUSPR3_M1_0p01to50Hz_tf.mat Damped: ^/trunk/HLTS/H1/PR3/SAGM1/Data/2013-02-12-1044766428_H1SUSPR3_M1_0p01to50Hz_tf.mat
Plots finally - all good. This is a pass for Phase 2b TFs. Phase 2b spectra were waiting on some adjustments to the M3 OSEMs per alog 5499 (since fixed) and will be taken soon.
