Stuart A. Jeff K. Arnaud P.
Today, after HAM5 chamber closeout, we took tfs measurements on all degrees of freedom of SR3 and SRM, using dtt. The suspensions were NOT damped during the measurement. SRM looks healthy (cf first pdf, compared with last tf taken in may), but unfortunately we think SR3 is rubbing, looking at the V2V transfer function (3rd page of 2nd attachment, black curve). The first vertical mode at 1.07Hz is unexpectedly damped, and does not look similar as the previous tf taken on July 15th, after the magnet repair. We tried to run the same vertical tf applying offsets in different directions hoping to find a configuration were the resonance would come back to a high Q, but without any luck (cf screenshot). We will run long tfs overnight using matlab to make sure it's not some kind of measurement artefact (which we doubt), and see how it looks tomorrow.
We also noted SR3 M3 osem alignment UL is not ideal (cf 2nd screenshot), which might have been exacerbated by this morning's HAM5 ISI rebalancing.
Measurements were added to the sus svn :
-----------SRM-----------
Data/2014_07_21_1400_H1SUSSRM_M1_WhiteNoise_L_0p01to50Hz.xml
Data/2014_07_21_1400_H1SUSSRM_M1_WhiteNoise_P_0p01to50Hz.xml
Data/2014_07_21_1400_H1SUSSRM_M1_WhiteNoise_R_0p01to50Hz.xml
Data/2014_07_21_1400_H1SUSSRM_M1_WhiteNoise_T_0p01to50Hz.xml
Data/2014_07_21_1400_H1SUSSRM_M1_WhiteNoise_V_0p01to50Hz.xml
Data/2014_07_21_1400_H1SUSSRM_M1_WhiteNoise_Y_0p01to50Hz.xml
----------SR3------------
Data/2014_07_21_1400_H1SUSSR3_WhiteNoise_L_0p1to50Hz.xml
Data/2014_07_21_1400_H1SUSSR3_WhiteNoise_P_0p1to50Hz.xml
Data/2014_07_21_1400_H1SUSSR3_WhiteNoise_R_0p1to50Hz.xml
Data/2014_07_21_1400_H1SUSSR3_WhiteNoise_T_0p1to50Hz.xml
Data/2014_07_21_1400_H1SUSSR3_WhiteNoise_V_0p1to50Hz.xml
Data/2014_07_21_1400_H1SUSSR3_WhiteNoise_Y_0p1to50Hz.xml
Phase 3a DTT TF measurements continued for the lower stages of SRM as follows:- - SRM M2-M2 undamped results comparison (see allhstss_2014-07-21_Phase3a_H1SRM_M2_Doff_ALL_ZOOMED_TFs.pdf below) - SRM M3-M3 undamped results comparison (see allhstss_2014-07-21_Phase3a_H1SRM_M3_Doff_ALL_ZOOMED_TFs.pdf below) ISI Status: ISI unlocked, not damped, no isolation for the duration of these measurements. SRM alignment: Zero pitch and yaw offset. Summary: SRM L DOF TFs for both stages appear a little ratty, but this is most likely due to turbulent purge air flow in chamber. However, both lower stage TFs appear consistent with other H1 HSTSs and the model, therefore raising no concerns. All data, scripts and plots have been committed to the sus svn as of this entry.
Dont tell me SR3 is rubbing. Thats enough to crush my spirit today............I could of sworn I checked all EQ stops. And I dont remember altering any vertical ones on SR3...excpet ones below the IM mass and they are still a logn way away. *sigh*. My fingers are crossed for measurement artifact.
Mike V, Rick S, Darkhan T
This afternoon the alignment of the ETMX PCal IR path was finalized. The upper/inner beam did not require adjustment of the periscope optics. The outer/lower path required realignment of two mirrors.
The alignment of the camera optics was finalized. The paths from both camera viewports were adjusted. The camera and enclosure that were installed in the upper viewport on the West side of the beamtube has been removed for this work, and will be re-installed at its final position in the lower viewport on the east side, next to the OpLev transmitter.
Particle counts were taken before, during, and after the in-chamber work. After entering the chamber, Rick wiped the floor plates to reduce stirring up dust. The actual counts will be posted as a comment, but the cleaning reduced the after-chamber-work particle counts from ~2000 cts to ~350cts for 0.3 micron/c.f.. A great improvement.
08:55 Daniel and Sheila working on optics table at end Y ? 09:00 Jodi reports H1 PSL chiller is alarming 09:02 Hugh to HAM 3,4,5 to balance check seismic 09:05 Jeff B. and Andres going to HAM 4 and 5 for contamination control closeout work 09:09 Paul and Jordan to end Y to work on PEM 09:10 Jeremy B. and Matt H. going to HAM 4 and 5 for closeout work 09:12 Jeff B. added 200 mL of water to the H1 PSL chiller 09:12 Nathan starting unattended work in optics lab with laser on 09:16 Mike V. to end X, PCAL work? 09:23 Rick called from end X, looking for Mike V. 09:30 Doug C. to ITMY, spool area to calibrate survey equipment 09:37 Jason heading out for ITMY alignment 09:46 Aaron to end Y to install illuminator chassis in SUS rack 09:52 end X is in laser hazard 09:53 Travis to ITMY to work on reaction chain alignment 11:15 Stewart and Arnaud to HAM 4 and 5 to better communicate with closeout team on transfer functions 12:48 end X is laser safe 12:59 Aaron to end Y with power cord for illuminator chassis, and then to end X to install illuminator chassis there ~13:30 Dale leading tour in control room 14:00 start of putting doors on HAM 4 14:11 Jeff K. to end X to measure cable tray lengths 14:12 Stewart into LVEA to start work on SR2 14:46 Hugh to electronics room to check coil driver chassis 14:56 Mike L. going to HAM 4 to talk to closeout team 15:05 Jeff K. back from end X 16:01 Nathan done unattended work in optics lab 16:30 Fred taking 2 visitors on tour through the LVEA 16:30 standing down on putting door back on HAM 4, reapplying first contact
Mike V, Rick S, Darkhan T
This morning Rick and Mike went into chamber to continue with the alignment of the PCal transmitter and periscope, with Darkhan outside. Alignment now looks good.
This afternoon we will continue with alignment checks of the camera mirrors.
Particle counts were reasonable before work commenced (attached photo IMG_0086), however after exiting chamber counts were very high (attached photo IMG_0087).
This is most likely due to stirring up dust; we will wipe the floors as well as the PCal periscope and Manifold Cryo Baffle which are noticeably dirty.
Some odd noises were also coming from the clean air compressor (very low audible tone), Kyle is investigating.
High Potential (HIPOT) testing essentially applies a predetermined high voltage to a device under test. If a threshold current is detected, the tester shuts down and issues an audible and visual alarm alerting the operator. The following items associated with the HAM6 ISC Fast Shutter system have been HIPOT tested using the indicated DC voltage. The threshold current was set at 300uA for all measurements. (Refer to D1400225 for cable components and D1400078 for overall shutter details) 1. Air-side 35 foot, 6 conductor cable - Tested at 3kV in every possible wire permutation including the connector body 2. 6 Pin vacuum feedthrough (Military 5015 connector compatible feedthrough) - Tested to 1.5kV 3. In-vacuum 10 foot, wiring harness (from flange to shutter) - Tested to 1.5kV while attached to vacuum flange 4. Fast Shutter Coil - Tested to 1kV as a fully assembled unit (between coil and fast shutter body) The chosen voltages are somewhat arbitrary based on an internal dialog with myself, but the maximum system voltage for the fast shutter is 500VDC. The fast shutter operational peak current is just under 30 amperes with that peak lasting a few milliseconds.
While working around the ISC rack behind HAM6, we noticed a cable labelled ISC_410 falling off. Not sure if it was plugged or not before. tbd
We are still installing equipment in this rack and pulling cables.
Updated the dataviewer and command line nds tools on the DTS to test changes to read unsigned int values.
Got a couple sections, 5 to 800Hz Friday evening before Matt grabbed it Saturday morning. Yes the number of averages was too many. Matt relocked te ISI and Sunday night the .01 to 5hz was collected. See attached for the concatenated sections. They look identical to the In-Vacuum TFs run a year ago. I'll attach those too for anyone interested.
TFs completed. Relocked ISI; float/locked position comfortably within spec.
ISI left Locked.
Upon unlocking HAM4 there was a shift of just a few 100 counts vertically. Relocked to confirm lock position--still good. No balance mass adjustments required.
ISI left locked.
Upon unlocking the ISI, there was a 1200,-4100,2800 count vertical shift in the CPSs; spec is <1600. Relocked to confirm and yes, we have a out of spec unlock position.
Just a little weight shift to correct this, a few tenths of a pound, I don't think the total mass changed by more than a 0.1lbs.
ISI left locked.
LASER is on Frontend output power is 36.2 W, HPO output power is 29.9 W Watchdog is green 'LRA out of range' error is active [OUT OF SPEC] PMC: Locked for 1 day 19 hours Reflected power is 19.5% of transmitted power (should be 10% or less) [OUT OF SPEC] FSS: Locked for 1 day 19 hours Trans PD threshold is .4 V, should be at least .9 V [OUT OF SPEC] ISS: Diffracted power is ~ 9% (should be ~10%) Last saturation event was 1 day 19 hours ago
HAM2: Apply first contact, check cables into ISS array HAM5: Check seismic, clean chamber, pull first contact, run spectrum, close doors ITMY: Reaction chain alignment BSC3: Check issues with first contact end X: PCAL alignment end Y: Installation of hardware for illuminators, laser noise eater Install doors on HAM4 and HAM5
model restarts logged for Sun 20/Jul/2014
2014_07_20 11:00 h1odcx
2014_07_20 11:05 h1odcx
2014_07_20 11:10 h1odcx
2014_07_20 11:12 h1odcy
no unexpected restarts
These were not running when I came in. I burtrestored both to 07/18/2014 09:00.
Based on yesterdays FC troubles I went back and had a look at some of my alogs regarding humidity in chamber.
By looking at the various pics I posted of particle counts in links:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12874
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12873
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12866
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12859
You can see the humidity in chambers varies from 13%-33%. I was surprised at this, and I have to take back what I had said to Kate and Calum yesterday at how I said I had noticed that the humidity levels usually stayed pretty constant in chamber here at LHO
No surprise,
According to the weather station at PASCO airport (KPSC) the relative humidity on Sunday ranged from 71% at 5am to 21% at 6pm.
The indoor humidity is influenced by the outdoor humidity and temperature.
Inside a chamber the air near a door is a mixture of purge air and LVEA air. The purge air is nominally 0% RH but the LVEA has been ranging between 20 and 40 recently. In addition those water molecules are moving way faster than the purge air and are very happy to move upstream.
