Attached are plots of dust counts requested from 5 PM June July 2 to 5 PM July 3.
Attached are plots of dust counts requested from 5 PM July 1 to 5 PM July 2.
Attached are plots of dust counts requested from 5 PM June 30 to 5 PM July 1.
From now on, the gain value will be included in the "rolloff" filter, and the extra "lock" filter is included in "boost". The sign convention is -1 (cf attached picture).
Attached is a spectra of top mass osem sensors in the longitudinal degree of freedom, comparing damped spectra with old set of filters, new one and with the suspension undamped.
Tomorrow, I will take an open loop transfer function and plot it against the model. Also, I will need to update the ODC "M0 damp state" bit status.
A new safe.snap has been commited on the svn.
The filters were installed in foton using the matlab "autoquack" function in the script "prepare_toplevel_damping_filters.m" located in /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ETMY/SAGM0/Scripts/
For now the script ONLY works for etmy top level damping filters, but will soon be modified to become more generic.
The pdf attached shows spectra of the same test with the optical lever sensors, in pitch
I created new models for the X-arm: h1susitmx, h1susex, h1susetmx and h1sustmsx, liaising with Vincent to get some SEI IPC signals defined. All four models have been successfully compiled and installed. They will not be started until tomorrow. Details are as follows.
h1susitmx:
h1susauxex:
h1susetmx:
h1sustmsx:
This puts these Actuators in their final configuration regarding the fluid regime. Of course there is still attachment & release...after Initial Alignment.
No issues here. Waiting for models before turning things on to check out systems--maybe tomorrow.
HIFO-Y crew asked for Isolation loops to be turned ON, on the IMC ISIs.
Those Level 2 Isolation loops were stable, and gave good performnce, in the past, under the same conditions. When turned ON today, they worked as expected on HAM2-ISI. There was however an unstability issue (drive growing exponentially) when turned ON, on HAM3-ISI.
Transfer Functions will be running overnight on HAM3-ISI to assess this issue.
The LLO Y-arm Pcal Periscope was taken out of the pre-alignment cradle and wrapped with two C3 HAM-DOOR fabric, see picture. Tomorrow will be wrapped, crane, and put in a crate ready to be delivered to LLO.
pablo
After correcting the routine (Routine 6 used since OAT) used to build the blend filters, I reloaded the new blend filters for all BSCs (1,2,6). With the new set of blend filters, less L4C noise should be introduced when the T240s are used in the stage 1 super sensors.
Test Stand cables run at EX (Filiberto & Crew)
GV5 closed (Kyle) & Dome Spreader moved over beam tube (Apollo)
TMS SUS crew working on Upper Mass at EX (Jeff & Andres)
Manifold Cryopump Baffle staging (Thomas)
hard power reset of SUS BSC123 to clean up noise from suspected power glitch (Vincent)
HAM6 doors being removed
SEI crew working on HAM6-ISI
New filters installed on ETMy Suspension (Arnaud)
PCal work in H2 PSL continues, no crane work today (Pablo, Colin, Rick)
2.8 x 10-7 torr*L/sec before opening GV5 -> 1.8 x 10-7 torr*L/sec 15 mins after GV5 open
Both cleanings at HAM5/6 completed before lunch. Door removal started after lunch. North door removed first and particle count taken. Cleanroom moved to the north. South door removed and particle count taken. Soft covers on both doors.
Attached is a comparison between the measured and modeled open loop of the control applied to the top mass of ETMY in long. The configuration during the measurement was similar as the one took previously (cf aLog 6969), with the damping/filter gain set to 3 instead of 1 for L (config used for running the interferometer). Once again the measurement matches the model, and surprisingly, even with a phase margin of 13º, the system stayed stable for days.
Now that we trust our model, the 2.1 filters will be installed today on ETMY.
Good data starts at 07/07/2013, 03:57:00 UTC H1:ASC-Y_TR_A_NSUM_OUT_DQ should hover around 250cts, which is half of the full 500cts.
Noise plot for tonight. The decrease around 1Hz is real, probably partly due to VCO noise, and partly due to alignment. The increase above 100Hz is due to the loop shape - I am running with a higher UGF tonight.
The good stretch lasted from 03:57 to 08:22 UTC on 7/7/2013.
Some relaxing filtering work brought the >100Hz contribution down a bit. We get 5Hz RMS across the whole band. Also, the 0.5Hz-2Hz suspension stuff is likely an artefact of using the transmitted DC light. It improved significantly with alignment. And it is about the same order of magnitude when we sit exactly on fringe (with 500cts), and should have significantly reduced frequency coupling. Again left it running, starting at 02:26 (July 8 2013).
HI Stefan, I think turning off the pump near HAM3 has removed a sharp line at 65.5Hz, but the rest of the structure around 60-70Hz was unchanged. The plots below show: 1) A coherence plot between ASC-Y_TR_A_NSUM_OUT_DQ and ISI-HAM3_BLND_GS13X_IN1_DQ from one of your early locks last week (June 29) and from this weekend's lock (July 7). The major difference is that the big coherence peak at 65.5Hz is gone. The coherence at 3.5, 5, and 41.5 looks a tad higher, but maybe just due to differing seismic conditions at the time (will check some more times). 2) Uncalibrated spectra of ASC-Y_TR_A_NSUM_OUT_DQ for the same two times. Here you can see that the 65.5Hz peak is gone. We'll keep searching in other places for stronger coherence in the 60-70Hz range. Josh
FWIW, while Michael Coughlin and I were searching in coherence we found two more ASC-Y_TR_A_NSUM_OUT_DQ peaks that are coherent with HAM motion. The peak at 58.5Hz is coherent with HAM2 ISI and the peak at 41.5 with HAM3 and HAM2 (also in CS MICs). These don't have much contribution to your RMS though. The first plot shows the coherence peaks, the second plot shows which peaks in the ASC-Y_TR spectrum these correspond to.
