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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 8/13 ==== KAGRA was closed Mon/Tue 8/13-14. ===== SR3 ===== * Enzo and team debugged an issue with height of the SR3 keystone coupling to yaw of the payload as measured by the OL. We suspect a ferromagnetic item on the SF damper, but we're not sure. ==== Report for week of 8/20 ==== ===== SR3 ===== * Hatoya-san and Enzo gathered date for a study of yaw mode Q damping time as a study of damper ring height. ===== SR2 ===== * We continued with cabling work. * We configured the second pico driver and connected it. * We assembled the LBB damper rings in the tank, craned them to near the top and hooked them. While the tank was open we also set the jacks below the mushroom that will support the suspension to nominal height. |
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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. |
===== SRM ===== * We reserved and configured two pico drivers. * We checked the prism gluing and all the jigs came away successfully. * Fabian assembled the RM. * Hirata-san added ballast masses to the IM and we weighed it, as well as the RM and the optic in the mirror box. * We suspended the optic and RM. |
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| * Constructing the tool to implement the current filterbank information to state space model. | ==== Report for week of 8/27 ==== * We did an inventory of arc weights to see if we had enough for SRM and found that we had only enough for a basic allocation for all of type B (172 kg for BS and 103.2 kg per SR) and almost no spare for tuning. We did a quick study of the IP frequency as a function of the number of arc weights using SR3, to see how much more we might need. If SR3 is typical we would need about 27 kg extra per suspension. ===== SR3 ===== * After the IP study, we left the SR3 with 6 10-mm arc weights and measured its frequency (with the digital system instead of a stopwatch). |
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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. |
===== SR2 ===== * We finished routing the the in-vac ===== SRM ===== * We moved the SRM assembly frame into its final position, reset it to the initial configuration, double-checked the heights of the crossbars, and lowered the optical table by 3 mm (to give margin for the optic to rise during hanging, which we had kept forgetting to do). We cleaned it up with the airgun and wet-wipes. We installed the IM ring and IM. * We assembled the SRM metal mass. Hirata-san made a jig from a plate with 4 screws which could safely hold the delicate front Sol-Black-coated ring upside down while the rest of the components were mounted on it. * We moved the metal mass to the mirror box and added the prisms and magnet standoffs. We applied the EP30 on Friday morning, but probably won't be able to check the result until after Obon. |
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| ==== 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. |
==== Plan for week of 8/13 ==== * KAGRA closed Mon, Tue. * Mark on vacation Mon-Thu, then Mitaka on Friday. * Enzo, Fabian, Terrence, Panwei, Rikako at Kamioka Wed-Fri. * Hirata-san on vacation all week. * Fujii-kun to help part-time with crane work and/or the IP tuning. * Diagonalization of new OL. * TFs with new OL. * Test of SF damper ring. * Controls work. * Tune SR3 IP. ==== Plan for week of 8/20 ==== * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri. * Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Thu, then f2f. * Kozu-kun works at Mozumi Mon. ===== SR3 ===== * Hook LBB, add ballast mass. * Tune IP. ===== SR2 ===== * Adjust ballast/trim mass, with reserve for yaw stepper. * Cable/test PI items (LVDTs, steppers, geophones). * Set damper height. * Add arc weights, adjust IP. * Stage LBB damper rings in tank. |
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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 ===== * Check gluing result - redo if necessary. * Assemble RM. * Add IM ballast masses (we forgot this before). * Get parts from AOL and set up new pitch-setting OL. * Hang metal mass. * Hang RM. |
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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). | * Mark: 8/13-16. * Hirata-san: 8/13-17 * 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 8/13
KAGRA was closed Mon/Tue 8/13-14.
SR3
- Enzo and team debugged an issue with height of the SR3 keystone coupling to yaw of the payload as measured by the OL. We suspect a ferromagnetic item on the SF damper, but we're not sure.
Report for week of 8/20
SR3
- Hatoya-san and Enzo gathered date for a study of yaw mode Q damping time as a study of damper ring height.
SR2
- We continued with cabling work.
- We configured the second pico driver and connected it.
- We assembled the LBB damper rings in the tank, craned them to near the top and hooked them. While the tank was open we also set the jacks below the mushroom that will support the suspension to nominal height.
SRM
- We reserved and configured two pico drivers.
- We checked the prism gluing and all the jigs came away successfully.
- Fabian assembled the RM.
- Hirata-san added ballast masses to the IM and we weighed it, as well as the RM and the optic in the mirror box.
- We suspended the optic and RM.
Report for week of 8/27
- We did an inventory of arc weights to see if we had enough for SRM and found that we had only enough for a basic allocation for all of type B (172 kg for BS and 103.2 kg per SR) and almost no spare for tuning. We did a quick study of the IP frequency as a function of the number of arc weights using SR3, to see how much more we might need. If SR3 is typical we would need about 27 kg extra per suspension.
SR3
- After the IP study, we left the SR3 with 6 10-mm arc weights and measured its frequency (with the digital system instead of a stopwatch).
SR2
- We finished routing the the in-vac
SRM
- We moved the SRM assembly frame into its final position, reset it to the initial configuration, double-checked the heights of the crossbars, and lowered the optical table by 3 mm (to give margin for the optic to rise during hanging, which we had kept forgetting to do). We cleaned it up with the airgun and wet-wipes. We installed the IM ring and IM.
- We assembled the SRM metal mass. Hirata-san made a jig from a plate with 4 screws which could safely hold the delicate front Sol-Black-coated ring upside down while the rest of the components were mounted on it.
- We moved the metal mass to the mirror box and added the prisms and magnet standoffs. We applied the EP30 on Friday morning, but probably won't be able to check the result until after Obon.
Plan for week of 8/13
- KAGRA closed Mon, Tue.
- Mark on vacation Mon-Thu, then Mitaka on Friday.
- Enzo, Fabian, Terrence, Panwei, Rikako at Kamioka Wed-Fri.
- Hirata-san on vacation all week.
- Fujii-kun to help part-time with crane work and/or the IP tuning.
- Diagonalization of new OL.
- TFs with new OL.
- Test of SF damper ring.
- Controls work.
- Tune SR3 IP.
Plan for week of 8/20
- Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Fri.
- Enzo, Hirata-san, Fabian, Kozu-kun, Terrence, Panwei at Kamioka Mon-Thu, then f2f.
- Kozu-kun works at Mozumi Mon.
SR3
- Hook LBB, add ballast mass.
- Tune IP.
SR2
- Adjust ballast/trim mass, with reserve for yaw stepper.
- Cable/test PI items (LVDTs, steppers, geophones).
- Set damper height.
- Add arc weights, adjust IP.
- Stage LBB damper rings in tank.
SRM
- Check gluing result - redo if necessary.
- Assemble RM.
- Add IM ballast masses (we forgot this before).
- Get parts from AOL and set up new pitch-setting OL.
- Hang metal mass.
- Hang RM.
To-Do Lists, Schedule
Vacation Info
- Mark: 8/13-16.
- Hirata-san: 8/13-17
- Terrence: 8/24-26 f2f, then returns to Hong Kong.
- Enzo: 9/14 JPS, 9/15 through 10/8 vacation in Chile.