Installation of the ALS periscope mirrors done

 Both the upper and lower mirrors of the ALS-PSL periscope were installed this morning.
Also I have spent some times to align the entire ALS path on the table so that the beam can nicely climb up the periscope and hit the center of the penetration hole and duct on the PSL enclosure wall (see attached picture). This work required the WP #3723 and the metal cap of the penetration hole was put back on afterward. The ALS beam is ready to enter the HAM1 chamber (although a light pipe will be required).

/* some notes on the beam power */
before ALS-Faraday = 125.8 mW
after ALS-Faraday =  123.9 mW

started dust monitor 9 in the LVEA

It is in the clean room in front of the west door of HAM1.

HEPI Plumbing Leak Testing Update

Since Wednesday when the welder completed the gross leak fix, the system had been losing about 1psi per day.  On Saturday all the valves to the distribution manifolds (at Chambers) were closed.  The pressure loss trend continued and yesterday a small leak was found and stopped on a Swagelok fitting under BSC1 where a 1/4" valve provides bleeding at a high point.  This morning the pressure was found to be holding so the main line valves have again been opened.  No pressure drop was observed so I am optimistic things are now leak free.  I may vent a couple small sections to install pressure transducers.  Otherwise will monitor the pressure for another day or so before calling it good.

plots of dust counts

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Feb. 18 to 5 PM Feb 19. Also attached are plots of the modes to show when they were running/acquiring data. I'm not sure why dust monitor 4 in the LVEA stopped. I have restarted it.

Data was taken from h1nds1.
2880 seconds worth of data was unavailable on this server
1440.0 minutes of trend displayed

CDS Maintenance Summary

lhocds. changed nat routing for ports 22 and 2222 such that SSH now routes to the 2fa server.

h1seih16. IO chassis power supply swap out and restart of front end. Dolphin problems meant we had to restart almost all MSR models which have Dolphin IPC.

h1dc0. went down a few times this morning in order to clone its boot disk in order to build h1dc1.

worked with PSL and HAM ISI groups to revert some recent SVN file changes.

Changed the NAT configuration of marble/h1dmt0 to route to the new ligo.org auth login server as part of its install process

Performed OS upgrades of some CDS servers.

Inspection in HAM2:

Jodi and I inspected HAM2 withness plates and surfaces, and found a lot of articulate.  Wafers also have visible finger prints, that I put there installing them - good reason to use our nifty wafer tweezers.  Particulate found on all wafers.  Examples include but are not limited to white fibers, black flecks, white flecks, metal flecks, bright red stuff, and a bit of First Contact.

- Jodi, Cheryl

Observations of witness plates and other in-chamber surfaces goes as follows:

Every surface we looked at had particulate, including table top, optic structures, etc.  Optics, both small fixed 2" and the larger 4" IM2 and IM4, show particulate.

Witness Plates:

- Worst contamination: 
One 4" witness plate on the HAM2 table top:
Exposed during IO installation, pump down and vent.  
Significant particulate, and my gloved hand print.

- Competing for the next worst contamination:
Two 4" witness plates in the beam tube, North and South of HAM2:
Exposed during pump down and vent.  
Large particulate easily seen from about 1.5m away.

Two 4" witness plates in the bottom of HAM2:
Exposed during pump down and vent.  
Large particulate easily seen from about 1.5m away.

- The winners, showing the least contamination:
4" witness plates in the beam tube, West side of HAM2 on ISI level-0, positioned North, Center, and South:
Exposed during pump down and vent.  
Small particulate easily seen by eye.

- The three 1 optics had some particulate but were very hard to evaluate in-chamber, so hard to say how much contamination is on their surfaces until we can pick them up.  There was a piece of First Contact, about 1mm square, on one of the 3 optics - it was missed by at least two sets of eyes before pump down.  The up-side is that this does show that FC stayed put on an optic during pump down and venting.

Current State of Witness Plates in HAM2:
We did not have containers to remove wafers or 1" optics, so new wafers were installed along side the old wafers, (in every position, the new wafer is installed in the counter-clockwise direction from the old wafer).  Two new wafers replaced the old table top wafer, and the old wafer was moved across the table, to prevent it from contaminating the new wafers.

Apollo crew

Moved cleanrooms in south bay per request from Betsy with approval from Jodi. Started ICC at BSC 10, documented chamber, pictures, wraped support tubes, covered RGA per instruction from Kyle. Ran compressor to blow out cobwebs and ready to start brushing tomorrow. John and I glued measurement spheres for reference before and after removal of coupon on sample beamtube and started setting up for coupon cut with plasma cutter.

HAM2 dummy payload removed

HughR, JimW, some Apollo

This afternoon, after Jodi and Cheryl did their in-chamber cleanliness assessment, we removed the dummy payload from the HAM2 optical table (6x 50lb masses and 3 10kg masses). No other components were touched, so there maybe other components to be removed from the table before PR's are installed.

Phase 1b M1 Transfer Functions for I1-MC2

   Attached are the plots for the M1 level transfer functions for MC2. This is the first of the India HSTS suspensions to be tested. The plots look good. While Stuart Aston and Jeff Kissel are reviewing these results, we will install the AOSEMs and prep MC2 for the power spectra tests.      

PR3- M2 AOSEM Brackets swapped

Late last week, Deepak and I precariously swapped the problematic and AOSEM brackets described in my previous alog:

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=5499

 

I use the word precarious because the operation meant that tools, small fasteners, and hands were wedged inside of the suspension above the optic and extremely close to fragile wires in order to replace the 4 brackets.  This did not make me happy.  See some pictures below, but the collection is also posted  ResourceSpace: https://ligoimages.mit.edu/?r=23901

HAM3-ISI - Level 3 Controllers

HAM3-ISI level 3 controllers were designed on Jan 16th 2013. Controllers are shown in the first .pdf attahcement of this post, and saved in the SVN under: /seismic/HAM-ISI/H1/IMC_Test/Isolation_Filters/HAM3/

Those controllers were designed on in-air measurements. In-air VS In-Vacuum comparisons show that the major resonances we account for during ISO loops design are not affected by switching from in-air to in-vacuum.

cdsfs0 and h1seih16

cdsfs0 was reset. I verified from the control room that I could recover this system "remotely" via the administration port. If it fails again before Tue I'll try to remotely recover it, but for now it appears to be a Saturday problem.

h1seih16 When I got to the control room at 15:30 I noticed that h1seih16 had been frozen from 13:15. I took it out of the Dolhin fabric and tried restarting the models, but no I/O cards are detected. I took a quick look at the IO Chassis and found it without power (front panel switch is ON, 24V power strip has +24V LED ON). It looks like  a power supply issue so I'm leaving this till Tuesday. I'm running the models to "green up" the EDCU, but no useful data is coming from HEPI HAM1.

/ligo file system is in read-only mode

For the second saturday in a row the /ligo file system at LHO has issued a scsi error and switched to read-only mode. I'll drive to the site later this afternoon to reboot it. We will work on replacing the scsi controller card next week to see if we can fix this problem.

The error occurred at 08:06 today, at at 00:05 last sat.

LHO LVEA HEPI Piping Valves Closed for leak checks

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!

plots of dust counts

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

PRM Phase 2b

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.
 

Friday Summary

• See the entry by Kyle and Gerardo about their MX vacuum gauge changeout
• The HAM 2 east door appears to be off
• Rick and Kyohei operated the 10W laser in the LSB lab
• Three alarms from dust monitor 4 occurred mid-morning while Cris was cleaning the work platform and the floor in the BS test stand clean room
• Betsy:  Changeout of PR3 SUS brackets
• Sheila:  Worked on picomotors at EY
• Justin:  Heavy lifting at clean and bake
• Keita, Kyohei, Gregorio:  Inspected the OMC in the H2 PSL enclosure
• The CDS channels listed in the morning entry remain yellow
• Work permits signed by ops today:  3717 (HAM 2 cleanings), 3718 (10W laser), 3719 (MX vacuum gauge)

PSL plots

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.

PR3 Phase 2b Power Spectra

Attached phase 2b power spectra for PR3.
The two first pdfs show a comparison of the power spectra between L1-PR3 (June 2012),X1-PR3 (June 2012) and H1-PR3 (Feb 2013) respectively damping off and damping on.
The three others show the effect of damping for the top, middle and lower masses of PR3

New power spectra will be taken tomorrow since Betsy has to change some of the OSEMs.