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| ==== 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. |
==== Report for week of 7/30 ==== * We set up an OL outside the tank and checked the SR3 pitch - it was OK. * We ran power to the SR3 pico and stepper drivers and tested them. * We tried to offload a 700 µm discrepancy between the BF GAS zero position and the IM-V zero position but ended up scrambling the IRM-IM alignment, probably through sending a command to the wrong pico driver. We mostly fixed the BF/IRM pitch/roll, but we have some more work to do to fix the IM/RM/TM pitch/roll. * We debugged a problem with the SR2 alignment - the chain was offset by about 5 mm to +T, leading to fouling at the IM and RM levels. Some 2 mm of the offset was due to the F0 keystone being off center, apparently due to some combination of different-strength blades and the CuBe auxiliary spring, but the rest is a mystery. * We fixed a problem with the levelness of the PI due to the feet of the IP being set at uneven heights into the PI weldment, and it got the IP very closed to centered but it didn't fix the fouling problem. * We eventually fixed the fouling by setting the security structure at a slight angle so it remains slightly off at the SF level but is good at the bottom. * We installed the SR2 SF damper Cu segments and magnet ring. * Enzo and team debugged a malfunctioning bit in the SR3 IP BIO which turned out to be a defective 37-pin gender changer. |
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| * 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. |
==== Plan for week of 8/6 ==== * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri. * Kozu-kun works at Mozumi Mon, Fri, and Thu afternoon. |
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| * Constructing the tool to implement the current filterbank information to state space model. | ===== SR3 ===== * Finalize optic pitch, OSEM alignment. * Do TFs with temporary OL. * Install final OL. * Hook LBB, add ballast mass. |
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| ==== 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. |
===== SR2 ===== * Add estimated final ballast mass. * Do PI cable routing. * Adjust ballast/trim mass, with reserve for cables. |
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| * Etc * Test prototype SR3 safety bar, and set up second safety bar. * Negotiate with Mirapro to get SRM mushroom installed, avoiding 5/15. |
===== SRM ===== * Assemble metal mass. * Glue prisms, flags. * Reconfigure, align assembly frame. * Tune F0 for SRM. * Add LBB blade units, cable clamps etc. * Check PI coil connections, IP LVDT magnets. |
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| * [[KAGRA/Subgroups/VIS/TypeB/March2018]] * [[KAGRA/Subgroups/VIS/TypeB/April2018]] |
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| * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779-v1 Type B Schedule (SR)]] | * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]] |
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| * Fabian vacation, 3/26-4/27 (then gone). | * Terrence: 8/24-26 f2f, then returns to Hong Kong. * Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 7/30
- We set up an OL outside the tank and checked the SR3 pitch - it was OK.
- We ran power to the SR3 pico and stepper drivers and tested them.
- We tried to offload a 700 µm discrepancy between the BF GAS zero position and the IM-V zero position but ended up scrambling the IRM-IM alignment, probably through sending a command to the wrong pico driver. We mostly fixed the BF/IRM pitch/roll, but we have some more work to do to fix the IM/RM/TM pitch/roll.
We debugged a problem with the SR2 alignment - the chain was offset by about 5 mm to +T, leading to fouling at the IM and RM levels. Some 2 mm of the offset was due to the F0 keystone being off center, apparently due to some combination of different-strength blades and the CuBe auxiliary spring, but the rest is a mystery.
- We fixed a problem with the levelness of the PI due to the feet of the IP being set at uneven heights into the PI weldment, and it got the IP very closed to centered but it didn't fix the fouling problem.
- We eventually fixed the fouling by setting the security structure at a slight angle so it remains slightly off at the SF level but is good at the bottom.
- We installed the SR2 SF damper Cu segments and magnet ring.
- Enzo and team debugged a malfunctioning bit in the SR3 IP BIO which turned out to be a defective 37-pin gender changer.
Plan for week of 8/6
- Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
- Kozu-kun works at Mozumi Mon, Fri, and Thu afternoon.
SR3
- Finalize optic pitch, OSEM alignment.
- Do TFs with temporary OL.
- Install final OL.
- Hook LBB, add ballast mass.
SR2
- Add estimated final ballast mass.
- Do PI cable routing.
- Adjust ballast/trim mass, with reserve for cables.
SRM
- Assemble metal mass.
- Glue prisms, flags.
- Reconfigure, align assembly frame.
- Tune F0 for SRM.
- Add LBB blade units, cable clamps etc.
- Check PI coil connections, IP LVDT magnets.
To-Do Lists, Schedule
Vacation Info
- Terrence: 8/24-26 f2f, then returns to Hong Kong.
- Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.