Installed Trillium Interface Chassis S1101837 in Rack SEI-C1 (slot U18). Trillium was placed close to southwest side of BSC9. Outputs from Trillium were connected to AA Chassis U30, CH21-26 (Port 5). Trillium may need to be zero-ed. Filiberto Clara
Seismometer installation completed at 12:06. Patrick had earlier returned from EX.
Seismometer installation completed at 12:06. Patrick had earlier returned from EX.
The dust monitor at end X has stopped communicating. From trending back it appears to have stopped sometime around Jan. 31 2014 17:46 - 17:55 UTC (9:46 - 9:55 PST). It is odd. The dust monitor itself acts as though it is receiving commands (the front panel goes into remote mode), but the software times out waiting for a response. I checked the front panel settings, the cabling, turned the dust monitor on and off, restarted the IOC and power cycled the Serial to Ethernet converter, all to no avail.
Rich will begin evaluating the low frequency performance of the beam splitter ISI.
Rich M, Richard, Dave Between the times 11:11 and 11:22 local I power cycled the h1seih16 front end and IO Chassis as part of the investigation of the intermittent 0.5Hz noise on HAM6 ISI CPS. The procedure followed was: in MSR Kill all user models and then the IOP model remove unit from Dolphin fabric power off the CPU from the console in CER power down h1seih16 IO Chassis using front panel switch remove 24V power cord for about 15 seconds reapply 24V power cord power up IO Chassis using front panel switch, verify timing slave start correctly in MSR power up h1seih16 CPU, verify no error on console
There's a huge 0.038Hz oscillation in ITMX OL laser intensity.
It's not compromising the OL PIT and YAW performance much if at all, but needs to be fixed at some point anyway.
Per WP #4422, Filiberto and Aaron have arrived at EX (11:00 AM local) to install the Trillium seismometer. Patrick is there also investigating the dust monitor.
This morning I can see that the drip is forming at the Valve Cover and not at the Valve/Manifold seal. The valve may still be working fine but it should be changed out and repaired. This could be delayed if the glitches and being offline for a few hours tomorrow is untolerable but I'd prefer to get it done sooner rather than later.
Here is the list of commissioning task for the next 7-14 days:
Green team:
Red team:
TMS:
ISCTEY:
SEI/SUS team:
(Alexa, Daniel, Stefan)
The RD rotation was adjusted to 120deg. This was determined such that the sideband signal was seen in only I, with nothing appearing in Q.
Note: the RF9 frequency is set to 9099471Hz (only 300Hz from the FSR). We still see RF AM.
Bubba reports that the installation arm is now attached at HAM4. Jeff B is preparing to install SR2. They hope to have the optic inside HAM4 by lunchtime.
If anyone was looking at data from PRMI overnight, I just realigned the etm, causing it to drop lock.
apologies, that was sheila, not stefan. PRM is also in its parking position.
The MC2 roll mode notch (FM6 in ISCINF) was left off overnight, resulting in a rung up 28Hz peak in MC_L, which was producing a huge signal in PRCL. Once on the peak slowly disapeard. PRMI locking is now quite reliable. However we still have relatively big power fluctuations. I recorded today's settings in a setup script: sballmer/tempfixes/setPRMI Really, this should be fed to a guardian.
I left the PRMI locked tonight.
PRMI stayed locked for 9h with only 1 lock loss in the middle. 1st lock: 2014/02/03 05:03:00 to 08:39:00 (duration 3h36min) 2nd lock: 2014/02/03 08:41:00 to 14:31:00 (duration 5h50min) All times UTC.
The coherence analysis using STAMP-PEM revealed strong correlation (0.5 Hz) between H1_SUS-ITMX_L3_OPLEV (YAW and PIT) and H1:ALS-X_ARM_IN1_DQ. The coherence plots produced by Patrick can be accessed from here. Josh did follow up studies confirming the presence of 0.5 Hz strucutre in ITMX oplev signals and also saw strong correlation between ITMX oplev and POPAIR signals. The coherence plots Josh made can be accessed from here.
In an effort to help the ISC crew use the seismic platforms I looked at ITMY performance today with the various blends and levels. That is still ongoing though. Meanwhile, since Stefan is able to lock his PRMI with the ISIs off, I propose that the ISI position loops do not do enough positioning to matter (HEPI is another story.) So in an effort to make the ISI turn on more 'one button', with the ISI off I loaded the current positions in to the position loop targets. With the position loops not doing much then, the Isolation can be turned on with the one button. That isn't to say the ISI won't drift somewhere again too far, but for the moment at least it is 'one button.' You can look at the first plot of trends to see what changed. Most changes are very small but RZ is maybe 2urads. Maybe significant but again, if the alignment is OK with the position loops off, these should be just fine.
So I brought the ISI up to Hugo's configuration of 6 Dec. Not that it can't be improved or that there are no problems but at least the BLRMS looks pretty good, I think a lot better than turned off. This configuration is 250mHz blends on Stage2 with T250 blends on stage1 except X & Y with T100mHz.44NO. This is with level3 controller. The script actually engages the boost2 rather than boost3 (heard that before haven't ya) but I really didn't see a difference at higher blends when I switched it to boost3 so I don't think it matters.
Again, we certainly need to improve these ISI performance, another day.
Spent some time looking at the noise of the CPS on the BSC after rerouting the sync signals
One figure is a matlab plot of some calibrated signals using a fixed target on which there are some VERY bad BS channels
the second plot is a dtt screen of all of the BSC CPS channels in counts, (BS-V3 is looking at a fixed target, all other channels are looking at motion) with all of the ISIs OFF.
there are a number of icky channels
Phil rewired the CPS distribution box ( i think that it is now identical to what is at LLO) and the really horrible noisey channels got better
there is still some excess noise in ITMY stage 2 corner three and may itmx stage 1 H3 although that might not be real
I measured the noise floopr of the HAM-6 CPS. This is in the configuration that seemed best at LLO, a ground from the electronics rack and a local ground.
The gold colored line is twice our noise model which is what we were getting at LLO. I have been using two different targets which are at +/-4Volts and since the noise goes as the square of the
distance we would expect the noise from the channels using the different targets to be (1+0.4)^2 and (1 -0.4)^2 (there is a 1mm offest) which is more or less what we are seeing at high frequencies.
At low frequencies (were we use then in the control) it is clearly steepper then the noise model
there is also a noise spike at 0.5Hz in H2 and V2, I chased this a bit last night and found
- It doesn't look like it is coming from the CPS electronics, I turned of the power to the CPS (unplugging the calbe in the electronics room) and it was still there
- when I shorted out the inputs to the HAM SEI interface on channels #1 and 2 it popped up in channel H3 and V3
- as far as I can tell it has always been at exactly 0.5Hz
the low freqeuncy excess noise might not be real. After doing some more measurements it looks like the theremal time constant is more like a 1/2 hour (guess) then a few minutes (2" x 2" X 1/2" aluminum wrapped in foam) so I probably didn't wiat long enough for these measurments