kyle.ryan@LIGO.ORG - posted 16:40, Monday 06 February 2012 (2166)
CP1 alarms are the result of an earlier reboot -> PID response is typical -> Pump level should return to normal range tonight
New 5-channel 4.5" CF ESD feedthrough flanges leak! -> Douglas D., Justin B. and I tested (2) each of these, one of which was to be installed and BSC8 today prior to pumping down the YBM. Helium responses were large and fast but we did not record the actual peak numbers as we were in a "pass/fail" mindset-these definitely FAIL! We may repeat test tomorrow and record leak rates for the record.
Travis, Jason and I spent most of the day down at EY struggling with the mechanics of ETMy as the chains are not well set in yaw and are proving a pain in the a$$ to align. In fact, we had to pull the reaction chain away from the main (via EQ stops) just to work on the main without reaction pushing on main. After ~5 iterations of Top Stage blade tip alignment, we finally ended the day with the main chain hanging at some 500urad out. Jason reports that this is roughly where we started this morning... We also fought a differential pitch between the ERM and the PenRe above it - due to the loop. We attempted to move the loop along the barrel a bit to see if that would help. It didn't appear to, so that's when we opted to clamp it off away from the main anyways.
Pictures are in ResourceSpace: https://ligoimages.mit.edu/?c=961 Original picture names describe what area the picture is capturing.
I've updated H2 SUS ITMY's compensation filters such that they contain all compensation for all stage's electronics. The coil driver compensation filters (found in the COILOUTF banks) are arranged in filter modules according to T1100507. The SatAmp whitening compensation filters (found in the OSEMINF) remain in FM1. I've also removed any old, erroneous, and/or unused filters in these banks. Note that the "to_nm" filter in FM5 of the OSEMINF banks is a calibration filter for the OSEM sensors (just a gain of ~40 nm/ct), but is untested and should not yet be used. Details ---------------- The new filter file, /opt/rtcds/lho/h2/chans/H2SUSITMY.txt has been copied over to the userapps repo, /opt/rtcds/lho/h2/userapps/release/sus/h2/filterfiles/ Because the updated coil driver compensation scheme involves different filter modules than the previous scheme, I've also updated the burt snapshot files, /opt/rtcds/lho/h2/userapps/release/sus/h2/burtfiles/h2susitmy_damped.snap /opt/rtcds/lho/h2/userapps/release/sus/h2/burtfiles/h2susitmy_safe.snap capturing them from the autoBurt.req file found in /opt/rtcds/lho/h2/target/h2susitmy/h2susitmyepics/
Witness plates, which are 4" diam. silicon wafers, were installed in BSC8 and nearby beam tubes. The first two attached images show the installation as of Feb. 1, and as installed on Feb. 2. Locations match, but the second images includes the detail, that may or may not effect the results, that a witness plate was broken and replaced in one location. Location for witness plates were chosen to give information about migration of particulate from beam tubes to the BSC8 chamber. Additionally, I chose locations to look at specific areas of interest. 1) both sides of the bellows in the Y arm beam tube (West) and the beam tube that is on the North side of the chamber - (bellows effect on particulate migration) 2) gate valves - in North beam tube and East beam tube - (gate valve effect on particulate) 3) directly under the gap between the ACB and ITMY - (to measure what particulate is falling in front of the optic) 4) directly in the center of the chamber - requested by Jodi for ICC - (to measure overall BSC8 particulate) I've chosen to aLog witness plate info under LHO, VE, and I've included the specific chamber in the title, i.e. Title -> "specific chamber" Section -> LHO Task -> VE I've also attached two in-chamber photos of witness plates placed on Feb. 1 - North Beam Tube and East Beam Tube.
One image attached here, and the rest found in ResourceSpace. https://ligoimages.mit.edu/?c=959
One image attached here, and the rest found in Resource Space: https://ligoimages.mit.edu/?c=958
After saving a new version of a wiki page, you see the new version of the page with a message at the top that says:
For my instance in the Pcal wiki, I finish editing the wiki and arrive at this page:
https://awiki.ligo-wa.caltech.edu/aLIGO/pcalWiki#preview
If I click through a link and come back, I get popups.
But if I go through the normal wiki page:
https://awiki.ligo-wa.caltech.edu/aLIGO/pcalWiki
...everything works as expected.
The default nds2-client software for Mac OS X workstations for H2 has been changed to use nds2-client-0.8.2. Users of Matlab should execute matlab from a terminal window rather than clicking on the matlab icon in order to get the environment set up properly. Note that there are a few machines (end Y, psl enclosure) that have not been configured to run matlab from the command line yet. This will be done on a normal Tuesday maintenance schedule.
Following the test whereby h2fw0 and h2fw1 had their QFS file systems switched: the Sataboy QFS in the LDAS server room continued to have problems. We have decided to rebuild the /ldas-h2-frames file system. Since h2fw1 is currently writing to this system, I have put h2fw1 into partial mode. It is running, but not writing any frames at all. The /ldas-h2-frames file system has been unmounted from h2fw1.
I've mounted the /cds-h2-frames file system to both NDS machines during the rebuild and repopulation.
Attached are plots of dust counts > .5 microns.
The BSC8 HEPI was placed on the fixed stops during the Dome install as the crew can't help but stepping on the Crossbeams. Once the Dome bolts had been torqued, I suspended HEPI again and read dial indicators for a final delta from last alignment time. Of note, the before & after dial indicator readings captures the ACB swung back and in place and I saw a 2mil(.002") lower reading to the west while the ACB had a little more leverage on the system--may be within the noise of DI reading and robustness. Anyway, post final alignment numbers on Jan 19: Level--There is a 5mil tilt down on the northside. Our Dial Indicators are essentially at the Support Tubes so I put this tilt in the small category: 0.005"÷60"=80µrads Position: I see a <6mil shift to the South & <10mil shift West. Rotation: The dial indicators imply a CW (from above) of no more than 60µrads. This is worse case as the SE corner shifted South 9mils and the NW corner shift South 1mil. Averages would reduce the rotation amount. As this is a close out, I've attached 17 pages of my log book mostly showing dial indicator readings and elevation surveys while we adjust to IAS requests and install and center HEPI Actuators. I know it is a bit messy but it is a logbook. If you need clarification just ask. A couple notes: DI readings are in .001"(mils). Corner 1 is NE, 2 is NW, 3 is SW & 4 is SE---This is different from LLO established pier numbering. I'll try to conform to this in the future. V T & L corresponds to vertical, Transverse(N-S), & Longitudinal(E-W)
Due to the stellar performance of an assembly tech, the final numbers I report here are actually with the Vertical Actuators locked down. See a subsequent report on Tuesday 7 Feb that reports final floating position.
Jim & Corey (I helped a little) put the 600lbs on top of the H2 ETMY ISI Keel. We passed the Keel Mass components (50lbs each) from the floor to the man on a four foot ladder. In turn the mass was then passed to the man (Jim) standing on the Test Stand. The mass was placed as per D1000897-v2. This should put us very close to balanced when the mass is replaced after Cartridge install.
ETMY R0, L1, L2 Open Light counts, offsets, and normalising gain values. Offsets are calculated by dividing the open light counts by two and multiplied by (-1). The gain values are calculated such that the open light counts are normalised to 30,000cts. ----------------------------------------------------------- R0 controls@cdsws1:~ 0$ tdsavg 30 H2:SUS-ETMY_R0_OSEMINF_F1_IN1 H2:SUS-ETMY_R0_OSEMINF_F2_IN1 H2:SUS-ETMY_R0_OSEMINF_F3_IN1 H2:SUS-ETMY_R0_OSEMINF_LF_IN1 H2:SUS-ETMY_R0_OSEMINF_RT_IN1 H2:SUS-ETMY_R0_OSEMINF_SD_IN1 29408.9 26594.2 28718 28591 27628.8 29841.9 OSEMINF OFFSETS: F1 = -14705 F2 = -13297 F3 = -14359 LF = -14296 RT = -13815 SD = -14921 OSEMINF GAINS: F1 = 1.020 F2 = 1.128 F3 = 1.045 LF = 1.049 RT = 1.086 SD = 1.005 ------------------------------- L1 tdsavg 30 H2:SUS-ETMY_L1_OSEMINF_UL_IN1 H2:SUS-ETMY_L1_OSEMINF_UR_IN1 H2:SUS-ETMY_L1_OSEMINF_LL_IN1 H2:SUS-ETMY_L1_OSEMINF_LR_IN1 30801.6 26947.8 31350.3 32767 OSEMINF OFFSETS: UL = -15401 UR = -13474 LL = -15675 LR = -16384 OSEMINF GAINS: UL = 0.974 UR = 1.113 LL = 0.957 LR = 0.916 ------------------------------ L2 controls@cdsws1:~ 0$ tdsavg 30 H2:SUS-ETMY_L2_OSEMINF_UL_IN1 H2:SUS-ETMY_L2_OSEMINF_UR_IN1 H2:SUS-ETMY_L2_OSEMINF_LL_IN1 H2:SUS-ETMY_L2_OSEMINF_LR_IN1 23679.1 23181.5 26177.6 23786 OSEMINF OFFSETS: UL = -11840 UR = -11591 LL = -13089 LR = -11893 OSEMINF GAINS: UL = 1.267 UR = 1.294 LL = 1.146 LR = 1.261
Insulation work is finished. Next week the interior drywall will be attached, roof plywood installed, and feedthrus drilled.
This afternoon, after a quick consult between IAS/SUS (Dennis, Calum, Hugh, Gerardo, Travis, Doug, Jason, me), it was decided that we would proceed with translating the QUAD to bring the longitudinal measurement back into tolerance. So, we will mobilize to push the suspension ~4mm towards the corner station. Doug has confirmed that on Monday (and probably Tuesday) IAS/SUS together will: - fix pitch R0 - translate QUAD longitudinally, monitoring yaw, x, y --Need to insert possible "fix" to R0 roll/side shift if indeed we need to. Norna is checking on tolerances of these DOFs. - make IAS gap measurement - Adjust R0 to fix gap and yaw if needed. OSEM general health has been checked, and all open light voltages have been measured and set.
Shortly after my prompt alog, Dennis emailed the following: > Betsy et. al., I have discussed the 4mm longitudinal position error with Peter Fritschel. Peter and I both recall that the tolerance for the arm cavity length is more like centimeters. (The +/- 3 mm position may apply to the recycling cavity lengths.) Given this fact plus a possible change in longitudinal position related to the move into the WBSC6 chamber, we do not think it is worthwhile to correct this 4 mm positional error on the test stand. Once the cartridge is installed into WBSC6, a new IAS measurement of the longitudinal positional error will be made. It is likely that this error will be within the static correction range for HEPI, or at the very least well within the true allowable arm cavity length tolerance. Dennis Coyne > The longitudinal position tolerance can be relaxed for all arms, not just the H2 Y-arm for the ALS test. Dennis Coyne
Further, we solicited for roll and side-shift tolerances which need to be fixted, and received the following email from Ken Strain: Hi, a roll error mixes the coordinates, a transverse error of a few mm has little effect on the force (as the pattern still faces the TM), but the resulting torque changes a little. Due to the large ratio between the radius of the mirror an the ESD gap, and the relatively benign nature of the changes in torque, the effects are very small compared to the permitted variation in force/torque among the 4 quadrants due to relative pitch and yaw wedge angles (between TM and RM). With errors described, of order 2mm, I can't see any consequences worse than (or even comparable to) those that have already been permitted. Ken
While the emails above appear to clear the plate of many adjustments, we are currently working on the suspension to fix the yaw of both chains and height of the reaction chain.
Earlier this month, we had made a complete assessment of all aLIGO SUS signs and flips across suspension types (see T1200015) and currently functional builds of those types (see SignStatus_120111.pdf). In doing so we identified: - Some suspensions had a few of their magnets flipped - The BSFMs had some mistakes in their Basis Transformation Matrices - Some suspensions had there OSEMINF sat-amp compensation filters defined with more poles than zeros For the most part, we have now rectified these problems. I attach a new assessment. The remaining action items are - Fix H2 ITMY M0's F2 and F3 magnet sign; to fix when we swap out for real ITM Optic - Figure out what's wrong with X2 PR3's SD OSEM; currently under investigation.
In regards to the issue with PR3's SD OSEM: Because of the arrangement and tight quarters in HAM2, it has been decided (RODA pending!) that some suspensions have their OSEMs Sensor/Coils over on "opposite side" (as opposed to the "side"), i.e. -Trans side of the suspension -- see E1100109 for which is which. It turns out PR3 is one of those suspensions. We therefore expect the magnet polarity to be [N] not [S], which means the COILOUTF gain should be [+] not [-]. Once this COILOUTF gain was flipped, the Transverse damping loop closed and was stable, just the like the rest of the DOFs. Mystery solved! *achoo!*
