After some serious hunting, Richard tracked the ITMy L2 problem down to the connection on the external side of the feed thru. It was on the wrong 25 pin feed thru port. I will re-cable the insides tomorrow.
Hanford Fire Department on site Cleaning of OSB bake oven room Migration of CDS network to new hardware
GregG, JimW Today at BSC8 we hooked up the last of the HEPI actuators, mostly went off without a hitch. Greg should be posting our dial indicator shifts shortly. For future reference, making vertical adjustments to the horizontal actuators can be made with a small bottle jack. Just place the jack on top of the HEPI base clamp and put the top in contact with the underside of the actuator "shelf". After the actuators were hooked up, we went inside and looked at the level of the optical table. Need to confer with Hugh about the results, but it still looks pretty good. Could be as good as no more than a 0.1 mm difference across the table. I say "could be", as the measurement was a little difficult to make. It's hard to read a moving ruler through an auto-level.
A while back I complained about the fact that the chamber, after cleaning, becomes black-ish quickly to various people including Dennis and MikeZ, and was surprised to know that they didn't know.
I talked with MikeL, RobertS and Jodi since then. This alog just restates what was already known by some experts.
All chambers seem to be covered with black stuff. Attached is the picture of the glove with which I swiped the inside wall of BSC6 last week. Robert looked at it to confirm that it is quite similar to what he saw when he went into BSC8 some time after chamber cleaning to measure the particle count. Jodi also showed me her glove sample from BSC6, which looked quite similar. It's reasonable to say that we're seeing the same oxidization process. Jodi also say that she didn't see this right after the chamber cleaning, but it develops within a few days.
A few notes:
We don't know if this is going to become worse with time, though, and I think it's prudent to ask Jodi to make an assessment of the chamber surface once in a while, i.e. to go inside, swipe using a glove and a wipe and keep them as samples, and also measure the particle count. Of course she's done these things, but make sure that it's done repeatedly over some time. A perfect opportunity is before we pump down the Y arm, and after one arm test concludes.
There might be other things, e.g. Robert and I talked about wiping a part of the BSC thoroughly clean, have Jodi approve it, swipe using a glove right after that, and leave the glove for a few days to see if it becomes black.
One important thing to remember is this:
No worker should assume that the chamber wall is totally clean.
If your sleeve brushes the chamber wall, you need to at least be aware that your sleeve might become a carrier for the black thing to migrate to somewhere else in the chamber.
If possible at all, in-chamber workers should not touch the chamber.
I asked to be the first person into BSC6 so that I could check on this very thing! We noticed this phenomenon while cleaning BSC7, the first chamber cleaned with the production procedure. We had the whole chamber wiped down according to the procedure (last wipe for each section should have no visible color) and waited for FTIR results to come back (~7 to 10 days) before we continued to the 2nd vacuum and close out. After the FTIR results came back, we went into the chamber expecting to finish up in short order. But we found that we were seeing black "stuff" on our gloves when we touched the chamber, so the decision was made to wipe down the chamber a second time and then complete the chamber cleaning process. Later, we had to pull the door at BSC7 again (~10-14 days) to follow up on an FTIR result (false positive), and once again, we saw black "stuff" on gloves. FWIW, upon microscopic examination, Rai Weiss found no visible particulate on the "last wipes" that he examined. (If anyone needs me to firm up the number of days between "sampling events", let me know.) We'll have another good opportunity to assess re-oxidation (or whatever it is) when we do install at HAM 1-2-3. Chamber cleaning was completed at HAM1 on 20 April 2012, HAM2 on 13 April 2012, and HAM3 on 06 April 2012. I predict that enough time will have passed to observe re-oxidation and that initial assessment on re-entry will show black "stuff" on gloves. I have become interested in a vacuum-compatible fixative for chamber interiors: any one got a viable idea?
After lunch on Friday, a crew accessed BSC2 through BSC3 and removed the beamsplitter suspension. The operation went very smoothly: all but four dog clamps were removed, four people supported the sus, and then two people removed the four dog clamps. Slick! Sus was transported out through BSC3 and is now laying on the LVEA floor. Since John was in chamber, I asked him to inspect the gate valves so he could comment on their cleanliness.
[Stuart A, Jeff B, Jeff G, Jim P, Dave, B, Filiberto C,] In this entry I aim to capture the status of the triple test stand as it was left, following my week at LHO. After the initial set-up of the triple test stand (see previous aLOG entry 2639) alignment of the BOSEMs could now be carried out on the M1 stage of PR3 (HLTS), using the real-time medm screen meters. Note that the medm screens are available on the triple test stand under the alias of "sitemap2". Once aligned, the complete suspension was covered with a canopy to isolate it from the turbulent air flow in the staging building assembly room. It should be noted however, that even after being left for over an hour to settle, during the day watchdogs were still being tripped, M1 OSEM position watchdog occasionally, and OSEM AC watchdog continually. To proceed with testing (actuation and sign checks etc) it was necessary to increase the OSEM AC watchdog from 8000 to 16000 counts. In preparation for running transfer functions, the following steps were taken:- - Configured coil output filters in medm screens (taking note of signs T1200015-v1). - Generating necessary SUS svn infrastructure for testing scripts, templates, data and results directories for SAGM1, SAGM2, and SAGM3 etc. However, while running actuator and sign checks a number of issues were uncovered, such as the default visual representation of the "drivealign" matrices not agreeing with the active functional blocks, resulting with unintentional cross-couplings between dofs. This and other issues resulted in the model being reverted to the last functional LLO version from 5th Jan 2012 (svn up -r 1709), since this is what is believed to be in actually in operation on the LLO triple test stand. All supporting common models were reverted too, compiling and installing went smoothly. n.b. both variants of the model have been compiled on the LHO triple test stand, x1sushxts27 and x1sushxts05 - with the later just needing to be installed when required. The largest obstacle encountered by far was the inability to actuate. The user model and IOP models both indicated that coils should be actuating, but no drive signals actually reached the coils. In-line break-out tests were conducted chasing signals from the AI chassis coil outputs to the coil drivers, where the drive signal was being prevented from passing through by the BIO. Configuring the BIO correctly proved problematic and so they were ultimately circumvented (for now) by feeding the coil driver signals directly through the "Test" inputs of the coil drivers chassis. This enabled testing to proceed:- - Successfully setting coil output filter offsets (actuating) and checking sensor sign was consistent. - The required M1 DQ channels were added do the x1sushxts27.ini file, to enable DQ channels for DTT transfer functions to be taken. - DTT TF templates were updated for X1 sensor and X1 excitation channels. During working hours it was impractical to try to obtain a full set of M1-M1 TFs. However, post 18:00 (Pacific) environmental noise had dropped sufficiently to allow the first complete set of TFs to be taken. These M1-M1 TFs for the un-damped PR3 suspension can be found below (2012_04_20_1730_X1SUSPR3_M1_ALL_TFs.pdf). Following the first set of successful TF functions, damping loops were closed, and another set of TFs taken (2012_04_20_1830_X1SUSPR3_M1_ALL_TFs.pdf). The PR3 TFs obtained look mechanically sound and in good agreement with the model. There is however some excess environmental noise coupling in from 5 Hz and above for some dofs. To wrap-up the first set of results for this suspension (and test stand), the data, scripts and plots have all been committed to the SUS svn. Also, a BURT snapshot has been taken of this functional triple test stand configuration called "20120420_x1sushxts27_PR3" which has been saved at /opt/rtcds3/tst/x1/cds_user_apps/trunk/sus/x1/burtfiles. To avoid any confusion, all other BURT snapshots were deleted, with the changes being committed to the SUS svn. Finally, I wish to thank the efforts of all those involved at LHO (LLO and elsewhere) in getting this test stand up and running! Pic 2012-04-19-499 shows the iMac interface to the test stand and PR3 under test (under canopy). Pic 2012-04-20-509 shows the test stand electronics rack in the staging building lobby.
Attached are plots of dust counts > .5 microns. I have also included a plot of H0:PEM-LVEA_DST12_MODE to show when the dust monitor in the H2 chiller room was disconnected.
[Jeff B, Deepak K, Andres R and Gerardo M2]
Friday 20th April 2012
- Assembled all the wire clamps neceesary.
- The wires for the upper blades were tensed and added to the clamps. Then the were assembled to the intermediate mass.
- The wires for the lower blades were also assembled in the same manner to the lower blades.
Eric got the last of the Feed Thrus protected along with the cable strain relief installed. The HEPI Pier Pods needed to be all plugged in and now that is done. The dial indicators are in place and we are ready to read them and float the system--Maybe Tuesday...
So we made a tweak of the HEPI to drop the South side and improve our other DOFs in the process. Following that we reattached the Horizontal Actuators. This was more that trivial. The translational moves were large enough that we had to translate the actuators to be able to reconnect them without binding bolts. So simple but access is poor and it took our crew the rest of the afternoon. After all connected, a final read of the dial indicators shows we did no harm. Please hope that attaching the Horizontal Actuators will be similar. So Monday: Attach Horz Actuators (Jim & Greg most of morning), Confirm IAS shots & check Optical Table Level--Adjust with HEPI if required, SUS tweaks Pitch, ISI release Lockers & rebalance as needed, Recheck IAS shots & table level. Thanks for your support and understanding. GregG JimW MitchR & Hugh
We've gotten the Optic within tolerance but the Dial Indicators suggest we have pulled the Optical Table out of Level. We will make a slight adjustment with HEPI to address this level and hopefully further bring the Optic to 0,0,0 position. Greg, Jason, Hugh
(Corey, G2, Hugo, Jim)
Duration Of Activity: 9:00-10:45am
This is our first HAMISI that has functional & ready GS13's installed in it. It is boxed up and it sounds like it will be our first HAM ISI to be installed in the next couple of weeks. The box is now being filled with N2 (probably over the weekend), and should be ready to move out of here on Monday (to make way for HAMISI #6 plates for one of our next builds)
(note really sure why all my photos are upside-down. I flipped them & saved them in Photoshop, and they still are upside down. I took photos with my iPhone).
The plan of the day was to set a cleanroom over BSC2 so that we could pull the dome at that chamber and de-populate both BSC2 and BSC3, including SEI stacks prior to cleaning either chamber. Unfortunately, reality got in the way: turns out it is impossible to set two regular BSC cleanrooms side by side and have both cleanrooms center over the domes. If the short-sided BSC cleanroom was available, the plan would work but "the special" cleanroom is tied up at BSC8! In addition, there is a limited soft roof supply soooo.... We went with de-install lite: pull the beamsplitter from BSC2 and then de-install at BSC3. After lunch, Cheryl and I went in to document the condition of the optics and chambers. Cheryl took lots of pictures. The highlight (or low light) of the initial inspection was the elliptical baffles in BSC3 and BSC1. The side of the black glass facing away from the optic has both a very fine layer of particulate and then an overlying of larger particulate. There seem to be features associated with gloved fingertips touching the glass: it looks like the oxide from the chamber interior may be differentially attracted to these spots. (I'm sure Cheryl will attach pix when she gets a chance.) On a brighter note, the side of the glass that faces the optic looked quite clean. We found the usual metal fines, a few fibers, etc. on the suspensions. Of the three chambers, BSC2 appeared to be the dirtiest. I took a wipe sample from the chamber bottom and collected two clumps of fibrous material there. We looked at bellows convolutions: BSC1 was atrocious as it contained a couple areas that looked like chunky mucus and some small shards of what looked like black glass. We saw the usual mess at gate valves with particulate accumulated onto rollers, large particulate gathered up in all the low spots and lots of smaller particulate on all flat surfaces. There is even a very long fiber (~2 inches) down in BSC1's gate valve. (I'll try and collect it when we chamber clean there.) Once we were finished, Michael L, Chris S, and Kiwamu went in and retrieved the OSEMS and beamsplitter from BSC2.
Pictures attached in a pdf.
[Jeff B, Deepak K, Andres R and Gerardo M2]
Thursday 19th April 2012
- The Upper mass was weighed and additional weighs were added to match the weight of 3115g.
- The Intermediate mass was assembled and additional weights were added to match the weight of 2983g.
- The Lower mass was assembled and weighed to be 2891g. The weight was 12g lower than the mass from Nebula (2903g).
- The additional mass was added to the intermediate mass bringing its total weight to 2995g (2893g + 12g).
Attached are plots of dust counts > .5 microns. I have also included a plot of H0:PEM-LAB_DST3_MODE to show when it was invalid.
The airshower has been installed and is now working properly. We can get strong airflow inside, although the seams where the top and bottom join still need to be caulked. The laser and anterooms are being finished up, groove filler is installed and the wall panel gasket will be finished tomorrow. The certification process will finish tomorrow with dust and pressure readings.
Travis and I finished pay-loading the suspensions on the BSC8 ISI table (sleeve, cross braces, vibration absorbers). We left the QUAD hanging free, no shields in place, so be careful if you must enter the chamber. The reaction chain cabling is half undone due to some troubleshooting needed on the L2 OSEM signals (looks like a shorted cable somewhere - ugh). So, don't look at the reaction chain alignment. I believe Hugh is up next for HEPI work, followed by some more IAS X,Y,Z alignment.
We'll have to get some Benzodiazepine for the next time we have to take levels. Attaching the horizontals went fairly smoothly. As Jim stated using a bottle-jack worked well for setting the vertical position. The SE corner horizontal actuator has a bound bolt and was somewhat more difficult to set but it went into place without too much trouble as well. A little bit of prying happened on the actuators to get them centered within their bellows. This caused a bit of movement on the support tubes, but not much. in thousandths of an inch NW SW SE NE ΔV 1d 3d 7d 5u ΔX 5s 3s 6n 5n ΔY 2e 3w This should hopefully translate to less than 25 μrads of cw* movement. *Edited from ccw Hugh showed me the error of my ways. This is good though because we were out 70 μrads ccw, so we should now be even closer.