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| ==== Report for week of 11/12 ==== | ==== Report for week of 1/14 ==== * Etc * Mark inventoried lots of items and updated the [[KAGRA/Subgroups/VIS/TypeB/Status|Status]] page. * SR2 * Hirata-san helped with installing the obelisk on the LBB, and added counterweights to get the LBB level and at the right height for the first rough alignment. However the springs were still at or near the top stops, so he later pulled down the LBB with excess mass, locked the blades at the bottom of their range and reset the LBB rods and damping magnet ring, aiming off by 10 mm so that it would be correct when the LBB was allowed to rise to midrange on the blades. He left it pressed down for now so that Hirose-san could apply FC. Early next week he will release it and do the final ballasting. * Hirose-san applied and removed FC on both sides of the optic for cleanliness. * SR3 * Enzo installed IM damping filters. * Mark installed a BIO Converter for the stepper remote enable (which will eventually also be used for the WD). * Fabian researched buoyancy compensation and pre-applied as much as possible to SR3. The total compensation needed is 0.19 mm for F0, 0.48 mm for SF and 0.46 mm for BF, total 1.23 mm. 1.0 mm had been applied with the jacks. The initial plan was to apply the calculated amounts at each level but then offset F0 1.0 mm lower to undo the jack adjustment. However SF was stuck approximately 1 mm lower than it needed to end up, so the buoyancy correction for it will have to be done at F0, and F0 will end up quite close to nominal. * Fabian also offloaded the IM pico yaw adjustment done by Enomoto-kun-tachi to the F0 yaw stepper. This left the OSEMs well-centered, so we will not need to adjust them and the LBB can be released. * SRM * Enzo fixed the broken triple in-air pico adapter cable and we plugged it back in. * Fabian calibrated the F0 FR. * Enzo and Terrence installed the arc weights and geophones, tuned and centered the IP, and centered and calibrated the FRs. * Mirapro helped us with the camera viewport issue by giving us a gasket of the same type but a different brand from their stock, which snapped easily into place. We then installed the viewport on the tank. Kokeyama-san will help us add the camera and camera LAN cable next week. * Simon gave us all the remaining items for the SRM OL except the 3D stage for the LEN QPD. ==== Plan for week of 2/4 ==== * Mark, Enzo, Fabian, Terrence at Kamioka Mon-Fri. * Hirata-san at Kamioka Mon+TBD. * Etc * Split SR2, SR3 and SRM RT models. * Get rid of the power reel behind SRM and plug stuff into the new power point instead. |
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| * Kozu-kun noticed the BS OL was out of range, and Fabian and Fujii-kun investigated. It turns out that the temperature has risen by over 2°C, so all the GAS filters have sagged and several stages are touching. Miyoki-san and Furuta-san are looking at what can be done. * We ordered three more geophone cables in the standard (non-flipped pinout) to save time during the December vent, where we will replace at least two of the preamps to fix issues and take the opportunity to put in non-flipped ones. |
* Run BNC cables for stepper remote enable, plug into BIO, debug. * SR2 * Do buoyancy correction. * Install camera viewport. * Install camera. * Run BNC cables for stepper remote enable, plug into BIO, debug. * SR3 * Release LBB. * Ballast LBB. * Install camera viewport. * Install camera. * Debug stepper remote enable. |
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| * We cabled all the SF/... through to the rack and checked that all items worked. * We did the vertical height survey and found that as with SR2 and SR3, the chain is longer than the CAD, this time by ≈7 mm, and again mostly between the SF and BF. We decided on a keystone height of 11.5 mm (5 mm higher than CAD), which can be achieved with 1 kg more on the SF and 1 kg in reserve for a yaw stepper mechanism. We reset the height of the yoke to give near-zero LVDT output for the new nominal height, and corrected the sensing and actuation signs, but still need to do the calibration. * The final SRM small glass mirror became available, so we had Hirose-san ship it to us so we can install it while the suspension is still on the assembly frame. Hirata-san ordered shims to make up the new recommended thickness of 1.4 mm and a micrometer to check the combination, which should arrive on Monday 11/26. * Enzo took calibration data for the last batch of geophones, for SRM. We had to borrow cables from SR2 because one cable was missing and another was miswired. And it turned out that one of the SR2 cables was defective as well. But if we can find two possibly borrowed by Okutomi-san and rewire one, we should have enough for SR2 and SRM. The geophones appear to be healthy and we will seal them next week. * We raised the PI clear of the assembly frame and unlocked and centered the IP. We calibrated the IP LVDTs, and reversed connections to get positive LVDT output for positive yaw. We borrowed a HPCD from SR3-IM-V for the SRM IP but haven't checked the actuation yet. * SR2 * While we were grabbing geophone cables from SR2, we added extra arc weights to get the IP frequency below 0.1 Hz. * Akutsu-san showed us how to install the OL transmitter support pillar, receiver shelf and viewports. We believe we have the parts to finish setting up the SR2 OL. ==== To-Do Lists, Schedule ==== * [[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 Type B Schedule (SR)]] |
* Install camera. * Hook LBB * Ballast LBB. * Do buoyancy correction. * Set up OL. * Debug stepper remote enable. |
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| ==== Plan for week of 11/26 ==== * SRM * Clean tools and metal parts for final SRM glass mass. * Swap in final glass mass. * Adjust SF trim mass. * Check/adjust alignment of SS. * Calibrate IP LVDTs. * Add arc weights and geophones. * Improve centering/tuning of IP and SS alignment. * Disconnect cables at feedthroughs, lock suspension. * Crane into tank. * SR2 * Finish OL setup * TFs. * Control loops. ==== Plan for week of 12/3 ==== * f2f Meeting at NAOJ - no Kamioka work. ==== Plan for week of 12/10 ==== * Prepare for vent of BS. * BS work - see [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]]. ==== Vacation/Event Info ==== * Hirata-san at Mitaka, Fri 11/30 (medical check for solvent use). * Enzo at Mitaka, Fri 11/30 (Mitaka day). |
==== Vacation/Travel Info ==== * Constitution Day, 2/11. * Mark and Enzo at KIW in Perugia, 2/12-18. * Enzo vacation, 3/5. * Enzo et al. Farewell Party, 3/7. * Enzo at JPS then final vacation, 3/13-29 * Terrence's last day, 3/29. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 1/14
- Etc
Mark inventoried lots of items and updated the Status page.
- SR2
- Hirata-san helped with installing the obelisk on the LBB, and added counterweights to get the LBB level and at the right height for the first rough alignment. However the springs were still at or near the top stops, so he later pulled down the LBB with excess mass, locked the blades at the bottom of their range and reset the LBB rods and damping magnet ring, aiming off by 10 mm so that it would be correct when the LBB was allowed to rise to midrange on the blades. He left it pressed down for now so that Hirose-san could apply FC. Early next week he will release it and do the final ballasting.
- Hirose-san applied and removed FC on both sides of the optic for cleanliness.
- SR3
- Enzo installed IM damping filters.
- Mark installed a BIO Converter for the stepper remote enable (which will eventually also be used for the WD).
- Fabian researched buoyancy compensation and pre-applied as much as possible to SR3. The total compensation needed is 0.19 mm for F0, 0.48 mm for SF and 0.46 mm for BF, total 1.23 mm. 1.0 mm had been applied with the jacks. The initial plan was to apply the calculated amounts at each level but then offset F0 1.0 mm lower to undo the jack adjustment. However SF was stuck approximately 1 mm lower than it needed to end up, so the buoyancy correction for it will have to be done at F0, and F0 will end up quite close to nominal.
- Fabian also offloaded the IM pico yaw adjustment done by Enomoto-kun-tachi to the F0 yaw stepper. This left the OSEMs well-centered, so we will not need to adjust them and the LBB can be released.
- SRM
- Enzo fixed the broken triple in-air pico adapter cable and we plugged it back in.
- Fabian calibrated the F0 FR.
- Enzo and Terrence installed the arc weights and geophones, tuned and centered the IP, and centered and calibrated the FRs.
- Mirapro helped us with the camera viewport issue by giving us a gasket of the same type but a different brand from their stock, which snapped easily into place. We then installed the viewport on the tank. Kokeyama-san will help us add the camera and camera LAN cable next week.
- Simon gave us all the remaining items for the SRM OL except the 3D stage for the LEN QPD.
Plan for week of 2/4
- Mark, Enzo, Fabian, Terrence at Kamioka Mon-Fri.
- Hirata-san at Kamioka Mon+TBD.
- Etc
- Split SR2, SR3 and SRM RT models.
- Get rid of the power reel behind SRM and plug stuff into the new power point instead.
- BS
- Run BNC cables for stepper remote enable, plug into BIO, debug.
- SR2
- Do buoyancy correction.
- Install camera viewport.
- Install camera.
- Run BNC cables for stepper remote enable, plug into BIO, debug.
- SR3
- Release LBB.
- Ballast LBB.
- Install camera viewport.
- Install camera.
- Debug stepper remote enable.
- SRM
- Install camera.
- Hook LBB
- Ballast LBB.
- Do buoyancy correction.
- Set up OL.
- Debug stepper remote enable.
Vacation/Travel Info
- Constitution Day, 2/11.
- Mark and Enzo at KIW in Perugia, 2/12-18.
- Enzo vacation, 3/5.
- Enzo et al. Farewell Party, 3/7.
- Enzo at JPS then final vacation, 3/13-29
- Terrence's last day, 3/29.