A big maintenance day today. While the DC power to the front end IO Chassis was being worked on, we shutdown all the CDS frontends with the exception of h1pemmx.

We then reconfigured the fibrer optics ports of the timing system. The MSR master, the two H1CER fanouts and the EY fanout were recofigured to the standard as agreed between LHO and LLO. The temporary fanout in the LVEA for the test stands and the MX fanout were not changed.

All the front end machines were powered down for this work. The MSR front ends were powered up in the order:

h1psl0

h1seib1,h16,h23

h1susauxh2

h1susb123,h2a,h2b,h34

h1lsc0,h1asc0, h1oaf0

EY front ends

LVEA Test Stand Front Ends

Some problem with h1pemey IO Chassis timing, moving the tcs SFP over to the pem IO Chassis fixed this.

All system should now be burt restored and switch on.

Completed the last three attachments.  No real problems encountered.

Post attachment Dial Indicator readings suggests only a little bit of shift:

Level/Tilt--The West and South sides dropped down ~0.1mm; how this actually translates into the suspended ISI tilting is difficult to deduce but I'd say the effect is less.  If it does fully tilt the Optical Table, using my level observations of the ISI table Thursday 24 January, we are still in spec; runout of 0.2mm.  It may possibly cause some grief to SUS though, SEI's condolences.

Horizontal position--I see about 0.1mm of maximum translation with most readings 1/2 or even less than that.  I would forecast a maximum rotation of 50urad CCW.

So all & all pretty good; thanks to Randy Thompson.

There is one issue with this system though.  The South Crossbeam is only about 1mm away from the HEPI Housing on the SE Corner.  This is enough room for nominal operation but over time if the system walks North for what ever reason, we may have to address that.  Attached is a photo.

The laser shut down earlier today due to a communication failure between the control boxes and the Beckhoff computer. What I think happened is the power to the ethernet to fiber converter for the LVEA control box was lost - this is plugged into an AC outlet and the prongs were barely in, so it probably got bumped. I'll wait until the CDS work is done to bring the laser back up.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Jan. 27 to 5 PM Jan. 28. Also attached are plots of the modes to show when they were running/acquiring data. Dust monitor 10 in the H1 PSL enclosure is still indicating a calibration failure.

The data was taken from h1nds0.
1260 seconds worth of data was unavailable on this server
1440.0 minutes of trend displayed

Transfer functions were measured during the week-end. Stage 1 and stage 2 look good (cf TF_L4C & TF_GS13). On the other hand, the TFs from stage 1 actuators to T240s in corner 2 and corner 3 don't look right (gain and resonance). These 2 instruments don't seem to work properly.

Matt, Keita

As noted in entry 5279 we had some trouble with changing MC2 acuation after the MC2 model change/restart.  It is not clear if the state before the change was the "right" one, and no explanation for the change was found (all MC2 coil driver bits were flipped, with no apparent change).  This should be looked at again with a model of the system in hand so that the measurements can be compared with expectations.  Since the "new" MC2_M2 TFs make the L1 filters stable, I am inclined to guess that we have returned to the "right" state.

In this state I changed the M2 stability filter to be very simple (zero at 2Hz, pole at 8Hz).  This gives the M2 cross-over resonable phase margin for all UGFs below 10Hz.  The attached images show the MC2 TFs with the M2 gain set to zero (no M2 actuation), M2 gain set to 0.03 (generally enough, and good for locking), and M2 gain of 0.1 (good for ISI work or high seismic times).  The maximum "good" value of the M2 gain is about 0.2, more than 0.3 is unstable.

Note that in the TFs involving MC2_M3, this system is working with heirachical control, so the measurement includes M3 and M2 (e.g., the whole MC2 actuation, or combine MC2 M2 and M3 actuator).  These TFs show that the M3 gain has about 8dB of gain margin, so gains more than about -2000 are likely to cause problems (-1000 is the nominal value).

Mark suggested to modify the "plot****_dtttfs.m" scripts for QUAD HLTS HSTS HAUX and BSFM. 
From now, it will automatically create a Results folder in the right path (if it is not already existing) to save the pdf figures.

For example .../SusSVN/sus/trunk/HAUX/Common/MatlabTools/plotHAUX_dtttfs.m 
line 108 to 113 :

DIR=exist(resultsDir,'dir');
if DIR==7
else
    system(['mkdir -p ' resultsDir])
end

We (Randy & I) got the 4 Vertical Actuators attached along with the SE Horizontal.  Hopefully we'll wrap this up mid-day tomorrow.

Ready to vent Y-end

LVEA laser safe all day

1030 Dave B restarting  PEMs and DAQ
1030 Cheryl and Kiwamu working in HI PSL enclosure
1040 Kyle to Y-end to prep for venting
1100 Corey G to LVEA then Y-end looking for "stuff and things"
1200-1245 Cheryl doing viewport work on HAM2, PSL shutter closed (see other aLog entry)
1240 RDO tractor onsite dropping repaired John Deere
1415 Jim B working in H1 EE room
1500 GV18 closed


Ongoing:
-No horseplay around Doug Cook's transit parked near termination slab of YBM. Marked with caution tape.
-ITMY watchdogs tripped all day. Optic seeing motion as a result of SEI actuator work on adjacent chambers.

   We have completed taking Phase 1b transfer functions and spectra testing data for the India HLTS SR3. The results data looks positive. The data files are posted below. We will wait for the review of the results by Jeff K and Stuart A before doing anything more to I1-SR3.   

- Cheryl, Kiwamu, Slim and Mark (Apollo)

A camera was installed on the REFL beam viewport where the REFL beam will exit the vacuum system through a baffle and viewport.  The camera view is available in the Control Room, and the IOT2L IMC REFL beam camera view was replaced by the IFO REFL camera view.  The hope is that the IFO REFL beam view will allow us to align the REFL beam through the baffle.  I got the beam to clip on the edge of the baffle aperture, and currently Kiwamu is working to improve this alignment.

Unassisted nominal ion pump current on-scale for the past three days -> OK

I have installed the latest PEM models into h1pemey, h1peml0 and h1pemmx. There were some naming errors and the MAG BLRMS channels which were mistakenly added have been removed. The DAQ was then restarted.

The DAC and ADC numbers for the simulink models of HAM2-HEPI and HAM3-HEPI  were adjusted. Models are re-compiled and commited to the SVN.

The ground STS that will help evaluating SEI controls performance on the IMC was wired in these models (STS A). Its readouts initially looked like the sensor was railed. We re-cetered the sensor's test mass by pushing the centering button of its interface. Readouts make more sense now. 

We measured a spectrum of the ground motion with this STS and compared it with the same measurement performed with the STS that is set on the ground at EY. Spectra have similar shape but different amplitude which make sense since the perturbation level is higher in the LVEA during work day (Friday, early afternoon), than it is at EY.

Folder arborscence was adjusted for HAM2-HEPI commissioning. HAM2-HEPI comissioning scripts were created from ETMY templates and added to these folder. Input filters and coordinate transform matrices are loaded. Same operations will be performed for HAM3-HEPI.