kyle.ryan@LIGO.ORG - posted 14:30, Thursday 08 September 2011 (1367)
Opened GV6 and GV8
Looks like there was communication to PT410
The ITMy LS is off of the QUAD and has been rolled into the adjacent cleanroom. We utilized the lifting equipment which we erected yesterday under the care of Calum and Kurt. All went great and the equipment very easy to use and maneuver into the tight spots under the cartridge. Well done SYS/FMP. Pictures to follow. We still have to separate the chains and do a little work on the structure before handing off to the Ring Heater crew. Maybe one more hour.
Where a comment to an aLOG is attached under the main entry, the formatting that a user enters into the comment is not retained (carriage returns, tabs, spacing, etc.). However, the redundant separated comment (that appears at the top of the viewing page) does contain all formatting. This fix will be imperative once the requested feature of Comments Only Showing Up Under the Main Entry is implemented.
Fixed Sept 2011. Will ask the LLO admins to apply the fix tomorrow. It will not result in any downtime.
Eric and Robert were working on the optical lever test at mid Y BSC 6 in chamber cleaning TCS ring heater work Preparation for removing ITMY lower structure Plots of > .5 micron dust counts attached.
Assembly #2 had a horizontal L4C with a bad pressure sensor on Corner 3. I removed the bad L4C (pod #10) and replaced it with a good one (pod #129). After verifying the readout the wall was put back on and the stages once again unlocked.
Soft-closed GV8*Switched XBM pumping from MTP to IP6*Burped GV7 gate annulus volume into aux. pump cart and opened GV7*Burped GV2 gate annulus volume into aux. pump cart and opened GV2*Switched Y-end pumping from MTP to IP11*Burped GV18 gate annulus volume into aux. pump cart and opened GV18 Leaving GV6 and GV8 soft-closed until end-station laser hazard issues are resolved.
The crew was split today. The dome work was completed by lunch time and the C-3 cover was replaced. Brushing in the chamber got started with 37 sections completed by the end of the day. Tool failures are running at about 50%. Four tools ran to the 1/2 hour mark and are ready for their first inspection ASAP. Four tools ran very slowly or for only short periods of time. We will retrieve chuck replacements from these and attach them to new drills and play the game again tomorrow.
Bland, Sadecki, Buckland, Torrie Reverified that the dummy Test Mass is at 22.5mm from the bottom of the cylinder to the top of the LS frame (within the 21.7mm +/-1mm tolerance). Today we removed the Sleeve and Vibration Absorbers from the ITMy, locked it down, unlaced the PUM and UIM Extension cables, pushed the Top Mass down to facilitate wire segment removal, removed some Top OSEMs to facilitate pushing the Top Mass down, and unclamped the Lower and Upper wire clamps at the Top Mass blade tips. We then test fit the LSAT hanger plates and are now looking for more hardware. We will drop the LS tomorrow. We stacked up the LSAT Elevator onto the 5-axis lift table, on the Lift cart. We hooked up the elevator and verified that it elevated with the controls. After playing with the full unit a bit, Calum and Kurt decided that they still were not happy with the rolling casters on the lift cart so they re-stacked the 5-axis table and elevator onto the new scissor lift.
I made a few changes to the QUAD (and BSFM) watchdog today:
(1) Changed the M0/R0, TOP stage, combined watchdog variable that's spit out to the BSC-ISI as a "payload" trigger to function as originally designed: zero (0) is OK, non-zero if BAD (1 if one of the stages is tripped, 2 if both).
(2) Reduced the number of thresholds on the DC monitors (there was a HI and LO threshold per OSEM, now there's one per cluster of OSEMs)
(3) Added the start of what will be become the over-rideable "damping must be on, or else BSC-ISI WD is tripped" logic.
I've recompiled h2susitmy, h2susitmx, h2susfmy, and h2susfmx, to include the above changes, and also made changes to the corresponding generic custom (ha!) MEDM screens where necessary. Ever change has been committed to the cds_user_apps repository, in either
${RTCDSROOT}/userapps/release/sus/common/models/
or
${RTCDSROOT}/userapps/release/sus/common/medm/quad/
${RTCDSROOT}/userapps/release/sus/common/medm/bsfm/
**place holder for further details and description of attachments**
Steve O'Connor, Chris G. and I calibrated the ring heater temperature, voltages and current channels in the front-end code. H2:TCS-ITMY_RING_HTR_SEG1_I_MON H2:TCS-ITMY_RING_HTR_SEG2_I_MON Ring Heater Current = 1.221E-2 mA/count (1V into ADC = 40mA = 3276.8 counts) & "deWhiten" filter = dewhitening by pole at 0.4Hz and zeros at 10Hz and 1kHz (+ gain = -1) Filter file: /opt/rtcds/lho/h2/chans/H2TCSITMY.txt H2:TCS-ITMY_RING_HTR_SEG1_V_MON H2:TCS-ITMY_RING_HTR_SEG2_V_MON Voltage over ring heater = 6.1035E-4 V/count (1V into ADC = 2V across Ring heater = 3276.8 counts) & "deWhiten" filter = dewhitening by pole at 0.4Hz and zeros at 10Hz and 1kHz (+ gain = -1) H2:TCS-ITMY_RING_HTR_SEG1_V_MON H2:TCS-ITMY_RING_HTR_SEG2_V_MON Local voltage across output from driver = 6.1035E-4 V/count (1V into ADC = 2V across Ring heater = 3276.8 counts)
Rolf installed a new h2tcsitmy model yesterday on h2tcsl0. He also installed a new MEDM screen, which I have linked to the sitemap. To complete this installation, we need filter-module settings to perform the adc-counts to engineering units conversion, and the list of channels which should be written to frame.
The TCS ring heater shield / heating element assembly, SN001, was weighed and it's resistance measured today. Results are as follows: D100680-v4, SN001 224g 35.8 ohms D100679-v4, SN001 228g 35.8 ohms Cables and brackets will still need to be weighed. - Cheryl, Chris Mueller
The crew was split today. Half of the crew worked on the dome. After the dome was lifted and the C-3 cover was removed, the crew started on the first checklist items: 1.)The conflat was removed 2.) The interior condition was documented and 3.) A particular area was investigated for contamination. The other half of the crew worked in and around the chamber. Viewports, camera, and illuminator were removed and preserved in a clean condition. The chamber interior was documented, pre-work wipe samples/FTIRs were taken, and the flooring was installed. Pre-work inspections, including the support tube surfaces, were conducted. Fibers were found on the support tubes. (No surprise there. That's 3 BSCs and 3 sets of support tubes with large fibers attached!)The fibers were photographed and then vacuumed off. The support tubes were wrapped in foil and C-3. Bellows protection was installed. Dust barriers were installed in both door nozzles to help protect the door/chamber flange area since both doors are still in place. That means brushing can get started tomorrow. GO TEAM!
Andres R. and Jeff B. installed Quad-4 on the mechanical test stand in the staging building. Final assemble and alignment will begin in the morning.
Today we mated FMY to the BSC/ISI. The fit between the test stand, inside the BSC/ISI, the Genie lift, and the Quad is very tight. Several times, we had to rest the Fold Mirror on the LSAT remove and reposition the Genie in order to complete the operation. We also encountered a fit issue between the unloaded Genie and the gusset plates on the test stand cross member. Once the Fold Mirror was positioned properly under the BSC/ISI, it installed with no problems.
On Friday, Impulse response measurements were conducted using a Bruel and Kjaer (B&K) impact hammer and tri-axial accelerometer (also B&K) on the Quad structure. The purpose of these investigations is to assess the effectiveness of the newly-installed Vibration Absorbers on the Sleeve of the QUAD structure. The Vibration Absorbers are arranged in a "spiral" arrangement around the frame of the sleeve structure of the Quad. One VA is on each corner of the sleeve with the position heights incremented upwards around each corner - giving a "spiral" arrangement around the sleeve. The accelerometer was positioned on the M0 chain side of the Quad on the cross brace of the Lower structure just above the Test Mass. It's X-axis was oriented along the beam path, the Y-axis crossing the beam path in the same horizontal plane, and the Z-axis vertically up through the Quad. The accelerometer's position did not change throughout each test. Tap tests were conducted for three sub-structures of the Quad, with multiple spots selected within each sub-structure. The three sub-structures are the Upper Structure (cage around M0/R0), the Lower Structure (cage surrounding everything below M0/R0), and the stiffening Sleeve Structure (structure surrounding the whole build) installed on August 19th. The Upper Structure had three tap test locations, the Lower Structure had four, and the Sleeve had five. The configuration for the BSC-ISI/QUAD system was: BSC8 ISI - locked H2 ITMY QUAD - unlocked, suspended with damping loops closed for both M0 and R0 chains. Watchdogs did not trip during any of the tap tests. Data was processed in real-time using the PULSE software provided with the B&K instruments. The PULSE software monitored for "double-hits" and for impact Force range. Data was then extracted after each measurement into .txt files that were imported and processed in Matlab. The VA OFF tests were conducted first. Three spots on the Upper Structure, four on the Lower, and five on the Sleeve were selected. The VAs were then replaced to their previous locations, and the tap tests were repeated at the same locations for the VA ON tests. The attached plots are Frequency response comparison plots of the Accelerometers in each degree of freedom (DoF) at each tap test location. The magnitude ((m/s^2)/N) of the accelerometer response is plotted against the frequency range (0.5-800Hz). Each plot has a trace in dashed-red displaying the data from the tests with the VAs OFF and a trace in solid blue of the data from the tests with the VAs ON. Each plot is of the same tap test location for ON and OFF. The pdf files are grouped by sub-structure (upper, lower, sleeve) and display the responses for all locations (in separate plots) on that sub-structure for a specific DoF. I have only attached the X and Y DoFs, but the Z DoF plots will be in the SVN. Data collection parameters were: 0-800Hz response with a 0.5Hz resolution. ---------------------- Tap Test Locations *for location reference, when facing the Quad from the M0 chain, the "Beam Tube side" is on the right and the "Clean Room side" is on the left.* Upper Structure: location 1 - M0 side tapping from the Beam Tube Side across to the Clean Room side. location 2 - R0 side tapping from Clean Room side across to the Beam Tube side. location 3 - Beam Tube side - diagonal cross-brace in a downward direction. Lower Structure: location 1 - M0 bottom - from Beam Tube side across to the Clean Room side. location 2 - R0 bottom - from Clean Room side across to the Beam Tube side. location 3 - R0 side tapping on cross-brace just above the PUM from Clean Room to Beam Tube side location 4 - M0 side tapping on cross-brace just above the PUM from Beam Tube to the Clean room side Sleeve Structure: location 1 - M0 bottom right corner of sleeve on the Beam Tube side location 2 - R0 bottom right corner of sleeve on the Clean Room side location 3 - M0 top left corner of sleeve on Clean room side location 4 - R0 top right corner of sleeve on Clean room side location 5 - diagonal cross brace on the Beam Tube side
2 Supplemental Items: -------- 1.) Attached is a picture of the location of the accelerometer used for the tests. The aLog automatically rotated the photo 90 deg counter-clockwise, but one can see the accelerometer on the cross-brace just above the test mass and slightly off center. 2.) The SUS SVN has been updated with the data and plots of these measurements as follows: Data Location: '~/sus/trunk/QUAD/H2/ITMY/Common/Vibration_Absorber_tap_tests/Data/' where the file names denote the Vibration Absorber ON/OFF configuration, which sub-structure on the Quad, and the location of the measurement. "VA_tap_test_data_VA_*OFF/ON*_*sub-struct*_*location*_110902.txt" Plots are located in: '~/sus/trunk/QUAD/H2/ITMY/Common/Vibration_Absorber_tap_tests/Plots/'
Also, it should be noted that these tests were performed with the H2 ISI ITMY (BSC-ISI) *locked* for these measurements. The suspicion is that the resonant modes seen between ~10 and 50 Hz are modes of the support structure coupling through the locked BSC-ISI. We'll need further B&K transfer function + ST2 ISI transfer function measurements with the BSC-ISI unlocked in order to confirm; the hope is to obtain these after H2 SUS ITMY (QUAD)'s lower half is returned.
Burped GV14 and GV15 gate annulus volumes into aux. pump cart*Opened GV14 and GV15*Switched YBM pumping from MTP to IP5*Burped GV1 and GV5 gate annulus volumes into aux. pump cart*Soft-closed GV6*Opened GV1 and GV5*Pumping BSC1 annulus with aux. pump cart Will continue tomorrow