HughR, FabriceM, MitchR, JimW

Follow up on the bad BSC6 CPS's found yesterday. This morning we investigated more fully and decided that it was most likely the probes that were bad, so there was some scrambling to find replacements. This was complicated by the fact that all of the CPS bake data in ICS had been purged and has not been reentered, so the only information we had on clean CPS's was buried in bake lab notebooks (many thanks to C&B for keeping this information handy!). We found some replacements in storage in the staging building and set about replacing the bad units with good as follows:

-St1V2 Bad CPS 13620 replaced with 12902
-St2V1 Bad CPS 13573 replaced with 12894

After that was completed (including switching phases on the cards for both replacement CPS's) we proceeded to rebalance the ISI. It is currently floating and TMS (I think, Dan and Aiden, anyway) is currently in chamber, unlocking their stuff (I think). SUS will unlock in the morning.

The attached pics show the current disposition of the cables and balance masses on corner 1,2 and 3 respectively.

Fabrice, Hugo,

HAM-ISI Unit #4 - Testing Report Phase 1 has been reviewed and validated. We can now proceed with the storage of this Unit.

Reports regading the previous units tested/validated (Phase I) at LHO are also available on the DCC:

HAM-ISI Unit #1
HAM-ISI Unit #2
HAM-ISI Unit #3

Chris Soike and I pulled two optics and placed them in cake tins so that they are ready for disposition. We put the suspensions in the front room on the big table: I assume they are destined for recycling.
2ITM02
FM01-A

-Cleaning (Completed 10 April 2012) Terry and crew 
*Note-ML waived second cleaning. Terry S. et al reported that the chamber was very clean when they did first cleaning.
-Door removal (Completed 10 April 2012) Apollo
-Retrieve witness plates(Completed 10 April 2012) Travis and Jodi
*Note-These five plates were put in place just before BSC8 was closed up and pumped down. 
Locations: 
#1-GV1 nozzle=Witness plate 5 (6 particles on whole plate)
#2-GV3 bellows convolution=Witness plate 4 (11 particles on whole plate)
#3-YBM bellows convolution=Witness plate 3 (8 particles on whole plate)
#4-Face of quad optic/ACB face=Witness plate 2 (5 particles on whole plate)
#5-Center of BSC floor=Witness plate 1 (8 particles on whole plate)
They should give us some idea of the quantity and quality of particulate that gets moved around during one pump down/venting cycle. 
-ACB swing back (10 April 2012)Thomas and Travis  
-Install BSC repair arm, 5-axis table, and elevator(Completed 10 April 2012) Apollo, CIT-Buckland and Anderson 
-Quad implementation ring and hardware in staging room (10 April 2012) Jodi

Condition of chamber was documented. Support tubes were inspected for fibers and then fibers were picked. The tubes were wrapped in foil and C-3. Bellows protection was installed. Brushing commenced after lunch: the ceiling was oxide-free by 2:30. Up-stream nozzle and mid-section were completed by the end of the day.

Just because I realized that we don't have the latest and greatest written down anywhere:

Until further notice, the nominal values for the ALL SUS Watchdog thresholds for ALL OSEMs on ALL stages should be as follows:

(Sensors)
OSEM DC LO: -30000
OSEM DC HI: 30000

Justification: The DC watchdog watches the raw ADC inputs of the OSEMs. The possible DC range should be between 0 cts (when the flag is completely blocking the LED) and the open light current, close to the ADC limit of 32768. At DC, during normal operation, the OSEMs should be centered to around 15000 counts, and typically do not move +/- ~5000 from the centered position. However, the "DC" bandpass rolls of at 10 Hz. The analog whitening filter is a [zero:pole], [0.4:10] Hz filter, which means that above 0.4 Hz there is appreciable gain, maxing out a factor of 25. That means although the DC signal will not go negative, any AC signal that's above 0.4 Hz may go negative.


OSEM AC: 8000

Justification: Here, typical undamped RMS velocities are something around 1000 cts AC RMS, and during transfer functions, something like 5000 cts AC RMS. 3000 over that should be a sufficient buffer for non-sense.

(Actuation)
ACT AC: 25000


Justification: Here the OSEMs don't have the drive strength to really do any damage, and we have a 18 bit DAC, so 120000 cts to play with. Typical levels for damped system are ~2000 cts, and for drive during transfer functions, around ~10000 cts AC RMS. Note that yes, we *do* use the full 120000 cts range for a drive, but the band-limited (0.1 to 10Hz band) RMS of this excitation does not typically exceed 10000 cts.

There may be a bug in my code, where the dust monitors that are set to beep are not having the data recorded when the dust monitor beeps.

I replaced the dust monitor at location 15 in the LVEA (in the clean room over BSC8) with the dust monitor at location 7 in the LVEA. The dust monitor at location 15 in the LVEA had a sensor failure.

We installed the properly-handed mirror mount for the upper periscope mirrors of the ALS green path on the in-air table.  The slots in the baseplate for the 1/4-20 bolts were just a hair too narrow for the bolts, so we used the initial baseplate (which is right-handed, if you think of the extra tab as a 'thumb').  Pictures attached.

GregG, MitchR, JimW

We intended to float and do some rough leveling on BSC6 today, but ran into a couple of road blocks. First off, the sync cables for the CPS's were found to be too short. One cable just barely made it, but the other cable was too short by a couple of feet. We found a 25ft cable, but realized a little late the it had the wrong gender on one end to be used by itself, so it is currently being used as an extension. After that was figured out and the CPS's were powered up, we found two sensors were railed. Preliminary investigations found no loose connections, but we did find a suspicious kink in one sensor cable. We will continue looking at this tomorrow.

So, instead of floating, we installed cable brackets. No pics right now, there's a bit of clean up still to be done there.

The PLX hollow transfer retro-reflector is nested in the spool at BSC6 and semi aligned.
Please be careful working around it as it is expensive, sensitive and replacement is 6-8 weeks out.

Greg and I installed the HWS electrical feedthrough panel on the D1200101-v2 on the in-air table. Unfortunately the panel was 5mm too long (which we fixed in the machine shop) and the Delrin insert for the 37-pin feedthrough butts up against the internal frame of the enclosure (see attachment). We'll need to rev the panel design to solve these issues. 

We're still assembling all the cables necessary for the install. Tomorrow we'll finish wiring it all up.

YBM is vented as of 15:00 today.

Rick, Michael R

We have shut down the PSL after discovering the diode chiller flow had dropped from 22 lpm to 13 lpm over the weekend. This appears to be caused by a collapsed water filter (photo is attached). The current filters in use are 1 micron, but we plan on swapping them out with 5 micron filters this week.

Lots of prep work so that the optic can go back into the chamber.
Work permits have been signed for staging and cleaning at BSC8 and for the venting of YBM. 
Below please find a checklist of items that need to be completed prior to entry,  (ETA) and whose responsible for those items. I'll *note items as they get completed.
-Garbing/staging cleanroom moved into place on west side of chamber cleanroom (*Completed 09 April 2012) Apollo-Dodson
-Engine hoist located and moved into position (*Completed 09 April 2012) Apollo-Dodson
-Locate BSC arm parts and stage (*Completed 09 April 2012) Apollo-Dodson, CIT-Buckland and Anderson
-Locate and move garbing/staging cleanroom contents into position. (*Completed 09 April 2012) Apollo-Dodson and me
-Vent BSC8 (~09 April 2012) Gerardo
-Stage special equipment (~09-10 April 2012) Travis
-Box up ITMy lower structure (~09 April 2012) Travis and Gerardo
-Cleanings (~10 April 2012) Terry and crew
-Door removal (~10 April 2012) Apollo
-Install BSC arm (~10 April 2012) Apollo, CIT-Buckland and Anderson
-Crane lower stucture in storage container to chamberside (~10 April 2012) Apollo?   

The doors were removed from the chamber and the support table was preserved clean for later use (if needed). The crew pulled off early.

The following list summarizes the latest phase of testing on the H2ETMY Quad.

Diagonalization of TOP stage OSEMs:
Alog #2448
Data:
'~/sus/trunk/QUAD/H2/ETMY/SAGM0/Results/2012-03-14_H2SUSETMY_M0_Vert_Diagonalization_1000cts.pdf

'~/sus/trunk/QUAD/H2/ETMY/SAGR0/Results/2012-03-14_H2SUSETMY_M0_Yaw_Diagonalization_25cts.pdf



Lower stage OSEMs are aligned and centered - all four L1 stage OSEMs are fairly well-aligned, but two of the remaining L2 OSEMs need to be adjusted.  The remaining two are within range, but about ~5000cts from the limits.


Damping loop functionality -  Damping loops close robustly, but performance has not been fine-tuned.  The QUAD has gone several continuous nights with the damping loops closed and not triggering watchdogs.  Closed loop transfer functions with damping enabled have been taken.

Alog #2482


Latest top stage TFs:
aLOG 2445

Data: 
- ~/sus/trunk/QUAD/H2/ETMY/SAGM0/Data/2012-03-14_H2SUSETMY_M0_0p01to50Hz_allDoFs_tf.mat
- ~/sus/trunk/QUAD/H2/ETMY/SAGR0/Data/2012-03-15_H2SUSETMY_R0_0p01to50Hz_allDOFs_tf.mat


Hammer tests of QUAD cage with vibration absorbers off + ISI unlocked:
Data:
~/sus/trunk/QUAD/H2/ETMY/Common/VA_Testing/2012_03_26_h2etmy_hammer_test/

In-chamber cleaning at HAM2 was completed on Friday and the doors were returned to the chamber.

Attached are plots of dust counts > .5 microns. The dust monitor at location 15 in the LVEA (under the clean room over BSC8) was reading a sensor failure for some time today. It seems to have gone away for now. I have included a plot of the mode (H0:PEM-LVEA_DST15_MODE) to show when it was not valid.