Mark B. Need to get a set of TFs for BSFM02 with damping on. Starting now.
There seems to be some pretty good Vertical to Pitch coupling we need to hunt down tomorrow on this sus. TFs look OK in some DOFs, but not this one.
We've corrected for some observed pitch error in the tablecloth which mounts the top BOSEMs. This has seemingly corrected the P-V coupling so I'll rerun the TFs tonight-ish.
There seems to be some pretty good Vertical to Pitch coupling we need to hunt down tomorrow on this sus. TFs look OK in some DOFs, but not this one.
Last Friday I spent most of the morning compiling, testing and modifying the code to read and control the dust monitors. This interrupted the data read from end X. I ended up reverting back to the old code sometime before 12:30 PM. Today I spent most of the morning doing the same, except it interrupted the data read from end Y. I ended up reverting back to the old code around noon. This afternoon Michael R. swapped the dust monitor in the H1 PSL Anteroom (LVEA location 16), to investigate if the high counts for particles > .3 microns read last night might be due to an error in the instrument. I ended up restarting the code for all the dust monitors in the LVEA after this was completed. I received an error trying to plot the particle counts, so I do not have plots to attach yet.
Dave, Hugo,
Sometime around 4.30pm today, HAM2-CPS-H1 showed ~ +32000cts. The Watchdogs were then tripped. We turned off the master switch on the medm screen and the coil-drivers electronics, the readouts remained the same.
Dave and I restarted the h1iopseih23 and the computer/frontend. No change.
Connecting the faulty channel on another sensor interface showed that the signal was following the channel.
I went upstream and checked the voltage outputted by the ADE box of the CPSs:
-over 13V for this sensor.
-Within +/- 1V for the other ones
I tried connecting CPS-H1 on its neighboring ADE board. I also tried swapping the FeedThrough-to-ADE in-air cables between H1 and V1. The readout of CPS-H1 came back to normal during this process. It seems like the in-air FeedThrough-to-ADE cable of HAM2-CPS-H1 is faulty. I left it ON keeping in mind the symptoms we saw.
Check ResourceSpace for the photo collection of Keita, Cheryl, Deepak and Corey inserting the sled. You can call it a breadboard if you want. Bonus: A couple shots of Travis working on PR2.
Mark B. After Travis tweaked the BSFM02 on the solid stack, I retested it. I gave up on the Matlab script for data taking and used some DTT templates that Jeff K pointed me to. The data is at ^/trunk/BSFM/X1/BSFM02/BUILD01/SAGM1/Data/2012-09-25_1100_X1SUSBSFM02_M1_*_WhiteNoise.xml I modified the standard analysis script to use H2:FMY in the channel names but X1:BSFM02 for the data directory and plot labels. The modified version is ^/trunk/BSFM/Common/MatlabTools/plotBSFM_dtttfsBSFM02.m The data is a tiny bit noisy, having been taken in the middle of the day, but all the peaks are in the right places and the spurious 11 Hz peak is gone.
The Apollo crew stood down from ICC to work on BSC8 cartridge de-install staging. They positioned the leg-jacks near the appropriate legs and checked for orientation; installed four leg-jacks on the chamber cleanroom; located three BSC dome flats and two HAM ISI storage covers to use in place of BSC Dome Tall; retrieved the dome counterweight from X-end; and removed the dome.
In addition to the backsight error I've been fighting against since 17Sept, see aLOGs 4223 & 4242, and disclosed in yesterday's log 4286; this morning I realized all this time I had failed to correct my target elevation for the HAM1 global to local level difference. This now puts the Optical Table ~5mm low and this is well explained by the modeled vs measured compression of the Viton Springs which has put the Table 5.33mm lower than planned. I will correct the incorrect payload noted in aLOG 4242 (11.25lbs) but this won't do too much to change the height and then we'll adjust the vertical to within spec using HEPI. Thank to everyone for patiently helping me for the past week.
Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot. Note high particle counts > .3 microns in the H1 PSL Anteroom (H0:PEM-LVEA_DST16_3). The > .5 micron counts are 0. The cause of this is as of yet unknown.
Cheryl, Keita, Deepak installation in HAM3 Corey taking packaged box of lasers from corner station to mid Y Pickup of pallet Corey to EY to look for parts Bubba to end Y to bring toolbox to corner station Jonathan H. to LVEA to look for GC wireless access points Dave B. to set settings for H1 PSL ODC channels Dave B. to install Apache on DAQ test stand Pickup of cardboard container Return of cardboard container Very high > .3 micron counts in H1 PSL Anteroom. Unknown case at this time.
This come down to me cutting an inch from my backsight but I should have cut 2. Maybe you put the 15mm & 9mm together and come up with 1". Yes, my instrument was 1" higher than I thought putting my results 1" lower than reality. I'll give the show and tell to anyone who cares. My apologies to anyone fretting over this. However, we are still 9mm high which is closer than 15 but still a lot and maybe too much for HEPI. We are now waiting to hear from ISC to learn what they can tolerate. See aLogs 4223 & 4242 if you need.
Sadly, the 2" lens on the QPD sled for HAM3 was scratched during the transport from the lab to the LVEA. When we took the sled assembly out of the bag and unwrapped, under a strong lighting it was clear that the center of 2" lens surface that faces outside was scratched, most probably by the aluminum foil that was used to cover the entire assembly. We couldn't blow it off using nitrogen gun, so it's not just particulates.
We have more of these lenses and we'll have one class-A-ed ASAP so the impact on schedule is minimal, but next time we transport any super polished optics, I'll make sure that I first cover it using Vectra Alpha 10 wipe for protection befure wrapping it in the foil. The reason why it was not done was because I couldn't find Vectra wipes in the lab, but it seems like no wipe = no transport.
It is worth noting that in most cases, we prefer to cover larger items with a C-3 cover for transport. A BSC door cover would probably work well for this task.
I'm going to run these TFs from home tonight.
The chamber cleanroom was moved over BSC5 and bolts were pulled from the doors and the dome. The crew was pulled off t work on BSC8 de-install.
Mark B. Picking up where I left off on Friday, aiming towards getting TFs.
Mark B. Done for the day. Had chronic problems trying to get TF scripts to run, so reverted to a free-swing test to at least get the mode frequencies. Most of the LF modes seem to be where they're supposed to be but there's a huge anomalous peak at 11 Hz in all DOFs but especially V and R.
I went in to diagnose what might be causing the anomalous 11Hz peak and found that the Top Stage blade EQ stop (aka the goalpost) was locking the right side blade down. I released this, then made a few small adjustments to correct for the now fully suspended chain/BOSEM alignment.
There appears to be a favorable slope change starting ~ Aug 8 (65 days on this log/log plot) Browsing the aLOG I find that near that time there were ring heater operations, and one week prior to this Kyle disconnected a small turbo pumping the BSC6 annulus. I don't think either of these explain the slope change. I also looked at the big ion pump voltages during this period - there were no step changes anywhere near this time.
GV18 was cycled on August 7-8 -Rai might have been making RGA measurements?
John, You are correct I was making measuremants and moving the gate valve on both August 7 and 8. It seems that the slope became 1/t after the measurements. It is not easy to understand this. The first thought would have been a leak in the valve between the RGA and the chamber with a poor vacuum in the RGA. This is not the case as the 2 liter/sec ion pump was holding the pressure in the RGA volume below that in the chamber. Another possibility is that the annulus system was leaking but you rule this out from Kyle's measurements. I am stumped. RW
Kyle decoupled the annulus turbo pump on July 31 - probably not this.
A signal we do not yet have is the BSC 6 annulus ion pump current as this chamber and it's pump were brought from the mid station. - I'll ask Dave about this.
Kyle recalls that he disconnected the annulus turbo pump for noise reasons at the request of Robert rather than for vacuum reasons. Some days later he was surprised to find that the annulus ion pump had "come on scale" as if the pressure had fallen in the annulus space to the point where the ion pump could start.
This suggests that there may be an inner oring leak from the annulus to the BSC6 chamber which might explain the slope change. Once the annulus ion pump began pumping, this gas load was removed from the chamber.
Richard has our electrician working at connecting up our new annulus ion pumps to the CDS system so that in future we will be able to trend these signals. At the time we did not assign any priority to this work.
