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==== Report for week of 1/29 ==== * We moved the top filter intended for SR2 (#1) into the SR3 cleanbooth. * Unfortunately we noticed one of the blades had many small X-shaped stress fractures on the top surface (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4058|4058]]). * We moved the top filter entered for SR3 (#3) into the SRM cleanbooth and inspected the blades. Two had one smallish stress fracture each and one had a huge fracture and looks close to failing (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4061|4061]]). * We referred the BS OL. * We removed the BS tank lid and inspected the BS top filter blades. They seemed fine (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4073|4073]]). * Hirata-san received and washed some ferromagnetic disks for IM flags and other small parts. * Hirata-san moved the BF with the tilted keystone (#1) out of the cleanbooth in preparation for rebuilding. * Hirata-san placed the second order for payload parts, and an order for remachining of nuts for cable clamps on rods. * Fabian measured the gain of the ADC system (homework from the Commissioning Workshop). |
==== 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. |
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==== Plan for week of 2/5 ==== * Enzo on vacation; all others at Kamioka. * - * Make in-air pico adapter cables. * Calibrate LVDT. * Test IM picos and BF yaw pico. * Test FR. * Install ballast mass in BF. * Build IRM around IM. |
* Etc * Test prototype SR3 safety bar, and set up second safety bar. * Negotiate with Mirapro to get SRM mushroom installed, avoiding 5/15. |
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==== Plan for week of 2/13 ==== * No work Monday (建国記念の日の振替休日)<<BR>> * Enzo on vacation * Hirata-san at Mitaka Tue, Wed (to receive and wash parts). * All others at Kamioka. * - * Cable/test/adjust IM OSEMs. * Do TFs from IM OSEMs to IM OSEMs, OL pitch/yaw. |
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==== Plan for week of 2/19 ==== * Lift BF/... section and check total mass and balance. * Cable and test BF picos. * Add section of SS up to SF ring. * Bring in SF. * Add Cu segments to SF cap. * Hook BF/... section. * Route cables up to under SF. * Check/adjust total mass of BF/... section. |
==== 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)]] |
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* Enzo 1/30-2/19 (at Mitaka 1/29, part of 1/30). * Fabian 4/2-4/27 vacation (then gone). |
* 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).