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| ==== Report for week of 1/14 ==== | ==== Report for week of 2/12 (February 12th) ==== * On Saturday we moved the vertical IM OSEMs in order to compensate for a large pitch in the IM introduced when the IR laser as aligned. * I took transfer functions over the weekend and the system looks healthy. * Although moving the OSEMs was done successfully, I accidentally pulled the cables and moved the flying saucer cable clamp set. I rotated it back judging the position by visual inspection, but an IM yaw drift appeared since then. It's moving with a speed of 0.2 urad/min. * On Tuesday we moved the Im back to zero but the drift continued. At the time of writing these lines it is at -833 urad, with H2 and H3 at 93 um and 47 um and still drifting. * On Saturday we connected the SRM geophones in-air cables and confirmed we had a signal. * However, on Wednesday morning the geophones are not giving any signal. We cheked the master model channel and realized the problem was not the slave model. We suspect a hardware fault. * I checked the in-air cables were connected. * We released the SRM optical bench and wiped the places where sticky tape was used to fix support blocks. * We wiped the SR2 optical bench and security structure. SR3 and SRM had been wiped by Hirose-san, Hirata-san and Fujii-kun. * Terrence worked on splitting the real-time models for all the SR suspensions. * Today the pumping down of the central area will begin around noon. We will monitor the four inverted pendulums * We got rid of the cable reel used in the SR2 rack. ==== Report for week of 1/28 ==== |
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| * Hirata-san ordered three 41 mm spanners for adjusting the jacks under the top of the tanks. * Mirapro installed bellows on the -Y side of BS and the +Y side of SR2. * Simon got us an LED, a 2D QPD stage and a second 300x400 mm breadboard, which should be enough to do the SRM TILT OL. He's working on a few more items needed for the LEN OL. * Terada-san and Uchiyama-san placed height markers on the SR tank frames showing the BS height and the desired SR heights allowing for 1/300 gradient: SR2 BS+17 mm, SR3 BS+56 mm, and SRM BS+70 mm. * Terrence and Mark reworked the Type B Guardian code to simplify future maintenance, so that the scripts `VIS_BS.py` etc are now tiny stub files which call common code in `TYPEB.py`. * Mark, Terrence and Enzo updated all the Type B models and MEDM screens to add support for binary output to the stepper driver enable inputs, and Enzo ran cables from the front ends to the BIO adapters, and thence to the drivers. We tested the SRM setup but it doesn't yet work. |
* 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. * Mirapro hooked the LBB. * 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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| * We installed the three new geophones originally prepared for SRM and then realized we'd made a serious mistake: the old wiring used adapters at both ends of the cable to compensate for the flipped preamps in the original geophones, and we forgot to take out the ones at the rack end. So two of the new ones appear to have been damaged and will have to be repaired. VIS has enough preamps to fix all the broken Type B geophones, but Type A will also need some more soon and there aren't enough in total, so we will have to repair them. * Hirata-san tried various things including turning the F0 FR carriage upside down to try to fix the jamming problem but it didn't seem to help. After advice from Takahashi-san and further debugging we discovered that we had a half-dead channel on the BS_GAS stepper driver, so we switched to a working channel, and that fixed things. * We recalibrated the F0 LVDT, this time measuring the height from the top down as we had been doing for the SRs. We also measured the range of the F0 FR in steps and millimeters and its effect on the keystone. * We tuned the IP for frequency and centered it in L, T and Y. We got 78 mHz. |
* 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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| * Hirata-san checked the F0 yaw stepper and it worked. * (CHECK!!) Hirata-san checked the channels on the SRM stepper drivers and found they all worked. However the F0 FR still didn't move, so he tried turning the carriage upside down, and that fixed it. So between the BS and SRM there were two independent causes of the same problem. * Fabian surveyed the height of the SRM relative to Terada-san's reference with the GAS filters at nominal height and found it was 3.5 mm low. This is well within the range of the jacks, so we will raise the entire suspension to fix it. * Fabian inspected the optic. It seems OK for dust, but there is still some residue left from removing the FC. We may try some more dabbing with acetone. * SR2 * Terrence and Enzo tested the third and last type of collimator (3500 mm) in the OL, but it had much too small a spot and dynamic range. We will standardize on 1.1 mm collimators for all OLs. * Fabian inspected the optic and found patterns that may be FC residue on both sides. * SR3 * Fabian and Ohishi-san tried using the Top Gun to remove dust found earlier by Hirose-san. The AR side came clean but the HR did not improve. Fabian wiped the security structure and LBB with Vectra10 wipes and ethanol. |
* Install camera. * Ballast LBB. * Do buoyancy correction. * Set up OL. * Debug stepper remote enable. |
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| ==== To-Do Lists, Schedule ==== * [[KAGRA/Subgroups/VIS/TypeB/ToDo]] * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]] ==== Vacation/Etc Info ==== * Hirata-san at Mitaka Thu 1/31, Fri 2/1. * Enzo at Mitaka Fri 2/8. * Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16. * Terrence at Kamioka till 3/29. |
==== 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 2/12 (February 12th)
- On Saturday we moved the vertical IM OSEMs in order to compensate for a large pitch in the IM introduced when the IR laser as aligned.
- I took transfer functions over the weekend and the system looks healthy.
- Although moving the OSEMs was done successfully, I accidentally pulled the cables and moved the flying saucer cable clamp set. I rotated it back judging the position by visual inspection, but an IM yaw drift appeared since then. It's moving with a speed of 0.2 urad/min.
- On Tuesday we moved the Im back to zero but the drift continued. At the time of writing these lines it is at -833 urad, with H2 and H3 at 93 um and 47 um and still drifting.
- On Saturday we connected the SRM geophones in-air cables and confirmed we had a signal.
- However, on Wednesday morning the geophones are not giving any signal. We cheked the master model channel and realized the problem was not the slave model. We suspect a hardware fault.
- I checked the in-air cables were connected.
- We released the SRM optical bench and wiped the places where sticky tape was used to fix support blocks.
- We wiped the SR2 optical bench and security structure. SR3 and SRM had been wiped by Hirose-san, Hirata-san and Fujii-kun.
- Terrence worked on splitting the real-time models for all the SR suspensions.
- Today the pumping down of the central area will begin around noon. We will monitor the four inverted pendulums
- We got rid of the cable reel used in the SR2 rack.
Report for week of 1/28
- 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.
- Mirapro hooked the LBB.
- 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.
- 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.