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| * Mark, Fabian and Enzo continued BS Test Hang work: * We shipped BS mirror box parts to Shoda-san and components for a new LVDT cable to Hirata-san. * We posed for pictures of the BS by a team from National Geographic. * We installed the BF fishing rod stepper motor adaptor cable. * We tried to install the BF LVDT cable but first we encountered trouble routing it, and then several wires broke at the D-Sub end. * We laid 6 in-air cables from the tank to the PR2 rank for BF and SF picos, steppers and LVDTs. * We lifted the BF/IRM/IM/RM/BS section to weigh it and check its balance. * It was 195.6 kg, which is 18 kg(!) less than the capacity of the SF. * There was a major imbalance in roll: with all four built-in trim masses moved up the +Y end, it still needed 270 g of extra trim mass to be level. This can probably be made up easily by designing the 18 kg of extra mass appropriately. * Unfortunately when we put the payload, the IM was slightly yawed and ended up on the horizontal EQ stop screws. This let the IM-BF maraging rod go slack, which disturbed the leveling of the IM (because every time it is picked up the maraging rod settles in a different place, giving a different suspension point). * We removed the end panels of the IRM to get access to the IM and rearranged the trim mass on the the IM to get it balance to bubble-level precision. (We still need to do fine pitch adjustment with the OL so that the BS is at the right angle, secure the trim mass properly and replace the IRM panels and OSEMs.) * Miyakawa-san and Yamamoto-san redid the cabling from the computer room to the PR2 rack and expected to finish by lunchtime on Friday. * Hirata-san * Did parts and fastener lists for the SR payload. * Did a 3D model with the SR suspension on the BS assembly frame (to help Mark make adjustments to the frame design). * Did 2D drawings of Fabian's concept for BS EQ stop parts. * Did a 3D model of a wire clamp with replaceable jaw parts (to avoid having to reuse parts with scars from pressure). * Did 2D drawings of a new wire clamps for on top of the BS and SR RMs. |
=== Type B (Mark) === ==== Report for week of 4/23 ==== * We hung the optic and set its pitch. The winch system had a lot of slop in it but the technique of relaxing the wires by lifting the optic on the EQ stops was effective in getting consistent results. * We tightened the clamps using a torque wrench, using settings of 5 N.m for the primary clamps and 20 N.m for the secondary. * We hung the RM and set its pitch. The RM winches were a lot more consistent. * However when tightening the clamps, the wire on the +Y side broke at the bottom edge of primary clamp. The wire on the -Y held, so the RM dropped a few mm onto the trolley on the +Y side. * We raised the RM trolley to support the RM and left the optic hanging inside it overnight as a safety test. * We then reversed the usual installation procedure to remove the RM and get the mirror box around the optic. We used clamp pieces as spacers to bridge the gaps created by the fact that the optic had been raised 3 mm during hanging and could not safely be lowered. We then cut the wires, leaving the op * Shoda-san made SRM model (Dropbox/Largefiles/Subsystems/VIS/Design/SR/Model/SRM-MetalMass_180426) * Shoda-san made 2D drawings of LBB ballast masses * Hirata-san washed parts. ==== Control Issues ==== * Resonant frequency table is ready for BS ([[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/TypeB/BSdetail|BS suspension details]]) * We found the inconsistency between local damping measurement and interferometer measurement. ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4811|klog4811]]) The TF gains from IML to TML, and from TML to TML are different from the interferometer measurement. * I checked the TML gain, which are calculated from TMP and TMY measurements, and found EUL2COIL matrix was different from what I supposed. --> Fixed it and updated the state space model. Might be OK now for TF from TML to TML. (Komori-kun will check it.) * I checked the calibration gain of OSEMs and found that the measured values are not used. But it makes only small difference. * Compare the TFs from BFGAS to BFGAS and BFGAS to IMV, and they are inconsistent for BS and PR2. (No data found for PR3)([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4807|klog4807]]) * Comparing TFs from IMP to TMP and from IMY to TMY also helps to check the OSEM calibration by comparing OSEM signals and Oplev signals. Found the matrix to convert OSEM signals (um) to pitch (urad) is different from what I calculated. To be checked. The measurement will be done after phase-I. * Constructing the tool to implement the current filterbank information to state space model. ==== Plan for week of 4/30 ==== * Shoda-san at Mitaka. * Mark, Enzo at Kamioka Mon-Wed or TBD. * Others having fun doing Golden Week stuff. * -- * Observe KAGRA Phase 1 operations, assist if problems arise. * Do BF TFs. ==== Plan for week of 5/7 ==== * Shoda-san at Mitaka. * Enzo at Kamioka from Tue. * Mark, Hirata-san at Kamioka full week. * Kozu-kun at Kamioka?? * Tanioka-kun at Kamioka Mon, Tue. * -- * Continue SR3 Hang * Inspect clamps and decide whether to reuse or swap in clamps from SRM IM. * Rehang optic. * Rehang RM. * Cable RM OSEMs. * Prepare for filter testing * Remove cracked blades from F0 #1 and #3. * Remove floor panel in SR3 area. * Set up filter building trolley with crossbars, jacks and F0 test masses. * Etc * Test prototype SR3 safety bar, and set up second safety bar. * Negotiate with Mirapro to get SRM mushroom installed, avoiding 5/15. ==== To-Do Lists, Schedule ==== * [[KAGRA/Subgroups/VIS/TypeB/March2018]] * [[KAGRA/Subgroups/VIS/TypeB/April2018]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]] * [[KAGRA/Subgroups/VIS/TypeB/ToDoSR]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779-v1 Type B Schedule (SR)]] ==== Vacation Info ==== * Fabian vacation, 3/26-4/27 (then gone). |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 4/23
- We hung the optic and set its pitch. The winch system had a lot of slop in it but the technique of relaxing the wires by lifting the optic on the EQ stops was effective in getting consistent results.
- We tightened the clamps using a torque wrench, using settings of 5 N.m for the primary clamps and 20 N.m for the secondary.
- We hung the RM and set its pitch. The RM winches were a lot more consistent.
- However when tightening the clamps, the wire on the +Y side broke at the bottom edge of primary clamp. The wire on the -Y held, so the RM dropped a few mm onto the trolley on the +Y side.
- We raised the RM trolley to support the RM and left the optic hanging inside it overnight as a safety test.
- We then reversed the usual installation procedure to remove the RM and get the mirror box around the optic. We used clamp pieces as spacers to bridge the gaps created by the fact that the optic had been raised 3 mm during hanging and could not safely be lowered. We then cut the wires, leaving the op
Shoda-san made SRM model (Dropbox/Largefiles/Subsystems/VIS/Design/SR/Model/SRM-MetalMass_180426)
- Shoda-san made 2D drawings of LBB ballast masses
- Hirata-san washed parts.
Control Issues
Resonant frequency table is ready for BS (BS suspension details)
We found the inconsistency between local damping measurement and interferometer measurement. (klog4811)
- The TF gains from IML to TML, and from TML to TML are different from the interferometer measurement.
- I checked the TML gain, which are calculated from TMP and TMY measurements, and found EUL2COIL matrix was different from what I supposed.
--> Fixed it and updated the state space model. Might be OK now for TF from TML to TML. (Komori-kun will check it.)
- I checked the calibration gain of OSEMs and found that the measured values are not used. But it makes only small difference.
Compare the TFs from BFGAS to BFGAS and BFGAS to IMV, and they are inconsistent for BS and PR2. (No data found for PR3)(klog4807)
- Comparing TFs from IMP to TMP and from IMY to TMY also helps to check the OSEM calibration by comparing OSEM signals and Oplev signals.
- Found the matrix to convert OSEM signals (um) to pitch (urad) is different from what I calculated. To be checked. The measurement will be done after phase-I.
- Constructing the tool to implement the current filterbank information to state space model.
Plan for week of 4/30
- Shoda-san at Mitaka.
- Mark, Enzo at Kamioka Mon-Wed or TBD.
- Others having fun doing Golden Week stuff.
- --
- Observe KAGRA Phase 1 operations, assist if problems arise.
- Do BF TFs.
Plan for week of 5/7
- Shoda-san at Mitaka.
- Enzo at Kamioka from Tue.
- Mark, Hirata-san at Kamioka full week.
- Kozu-kun at Kamioka??
- Tanioka-kun at Kamioka Mon, Tue.
- --
- Continue SR3 Hang
- Inspect clamps and decide whether to reuse or swap in clamps from SRM IM.
- Rehang optic.
- Rehang RM.
- Cable RM OSEMs.
- Prepare for filter testing
- Remove cracked blades from F0 #1 and #3.
- Remove floor panel in SR3 area.
- Set up filter building trolley with crossbars, jacks and F0 test masses.
- Etc
- Test prototype SR3 safety bar, and set up second safety bar.
- Negotiate with Mirapro to get SRM mushroom installed, avoiding 5/15.
To-Do Lists, Schedule
Vacation Info
- Fabian vacation, 3/26-4/27 (then gone).