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| ==== Report for week of 11/19 ==== | ==== Report for week of 12/17 ==== * BS * We opened the top of the BS tank after the vent. * We inspected the BS F0 blades for cracks but still didn't find any. * We removed the arc weights and geophones, and added new longer studs for the arc weights and new cables for the geophones. We then put back the original arc weights and new geophones. * We measured the geometry of the various IP items to check the IP diagonalization matrices. * We installed the new double-sided F0 FR. We were not close to needing to add the optional !CuBe spring. Unfortunately the FR had rather less friction but still didn't work. After checking a bunch of possibilities and comparing against SRM (also non-working) and SR2/SR3 (working), we suspect the carriage may be assembled upside down, with the metal plate below and the PEEK plate above. We will try changing it next week. * We adjusted the F0 keystone trim mass and were able to get it to sit at CAD nominal height at nominal temperature (24.9°C) with mid-range FR and modest extra mass (413 g). Interestingly, we noticed that removing the arc weights and/or geophones reduced the load capacity by a few hundred grams. * We measured the total range of the IP FRs in steps and set them to mid-range in preparation for tuning the IP frequency and (re-)centering the IP. |
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| * We locked the suspension and craned it into the tank. This is the last Type B tank installation! * While inspecting the O-ring between the service ring and the lower section of the tank, Hirata-san found a small nick, so he replaced it. (This will hopefully be the last time that flange is closed, so it needs to be left ready for Mirapro to tighten.) * Hirata-san and Fabian removed the First Contact, but found that a tiny piece was left behind. With advice from Hirose-san, they managed to remove it via several rounds of dabbing with an acetone-soaked lens tissue. * They removed the IM-RM safety bar, unlocked the lower half of the suspension, and got it reasonably well aligned by eye. * They moved the vacuum feedthroughs and in-air cabling over, and reconnected nearly all the electronics. (The in-air cabling will need some tidying later, but * SR2 * Enzo and Mark set up the the SR2 OL. We may need to steal the LED back temporarily to do pitch setting on SRM, but we can take some interesting TFs on SR2 over the weekend. |
* We borrowed an LED from SR2 and set the pitch of the SRM optic. * We found the SRM front end had crashed and could not be properly reset by cycling the power from the web interface. Yamamoto-san eventually got it working for us, although it didn't seem to take more than restarting the user and IOP models. * We sealed and retested the new geophones originally intended for SRM, but decided to use them on BS instead. * We installed the two OL viewports. We also tried to install the camera viewport but we couldn't get the Cu gasket to sit in the recess, so we gave up and will probably reallocate the camera viewport to SR3 for now (where it will go on a different type of flange which we've had success with. Saito-san says that we can get help with the SRM flange from Mirapro on 1/28. |
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| * Enzo configured a new stepper driver for SR3_IP and returned the one that had been borrowed from SRM. (The original SR3_IP had been used to replace a water-damaged unit on the BS.) * Enzo worked on diagonalizing the IP and modeling of the whole suspension. He created Foton filters representing the response of the system in slots FM6-8 of the various filter banks. |
* We opened the top of the tank briefly to inspect the configuration of the F0 FR, but didn't do any significant work. * Hirose-san inspected inside the bottom part of the chamber and found some dust, so he recommended we wipe with Vectra-Alpha wipes (IPA-resistant type) and IPA. he gave us a powerful LED flashlight array and asked us to use it to look for dust in all the chambers. |
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| * Mark got three more MPCDs (M = "medium" or "modified") from AEL and moved coil drivers around until all Type B suspensions had a driver in every position, with MPCDs for IM-H and HPCDs everywhere else. He returned the unused LPCDs. * Mark did an inventory of all the Type B electronics and got the various JGW Doc electronic items lists up to date - see [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7276|E1707276]]. This included opening all the LVDT drivers to check that they had the original cards - BS, SR3 and SRM did, but SR2 had both input cards new. We let AEL know. * Hirata-san helped Furuta-san with floor repair. * Fabian changed the PR3 thermometer battery. * Mirapro installed a bellows on the -Y side of SR3. |
* We gave Simon a list of items we still need for the SRM OL. He seemed to think that they should be in stock at Kamioka and will help us look for them next Tue 1/15. * Mark and Enzo booked flights for the KAGRA International Workshop. * Mark had to schedule a trip to Australia for the week of 1/21 to attend to family business. |
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| ==== Plan for week of 12/17 ==== * Final alignment of SRM payload, plus BF and SF GAS. * (Time permitting) unlocking/centering/tuning of IP. * Installation of Enomoto-kun's beam target on SRM (if available). * Installation/testing of F0 steppers on SR2, SR3, SRM, and (hopefully) final vertical height adjustment. * Installation of viewports on SRM. ==== Plan for week of 12/24 ==== * Most of team on holidays - no Kamioka work. |
==== Plan for week of 1/7 ==== * Make sure BS is floating, recenter OL to capture current yaw position. * Vent BS. * Inspect BS F0 blades for cracks. * Install new BS F0 FR, and (if necessary) auxiliary CuBe spring. * Confirm geometry of LVDTs, geophones, FRs etc and update T1707205 if necessary. * Replace geophone preamps and cables (to fix noise, offset, pinout flip issues). * Add more mass to IP to get lower frequency. * Adjust all GAS filters to near mid-range (using keystone mass for F0 as much as possible, and FR+LVDT for SF and BF). |
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| * Mark: 12/24 - 1/4. * Hirata-san: 12/24 - 1/4. * Fabian: TBD but similar. * Enzo: TBD but similar. |
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| * Terrence: back at Kamioka from 1/7. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 12/17
- BS
- We opened the top of the BS tank after the vent.
- We inspected the BS F0 blades for cracks but still didn't find any.
- We removed the arc weights and geophones, and added new longer studs for the arc weights and new cables for the geophones. We then put back the original arc weights and new geophones.
- We measured the geometry of the various IP items to check the IP diagonalization matrices.
We installed the new double-sided F0 FR. We were not close to needing to add the optional CuBe spring. Unfortunately the FR had rather less friction but still didn't work. After checking a bunch of possibilities and comparing against SRM (also non-working) and SR2/SR3 (working), we suspect the carriage may be assembled upside down, with the metal plate below and the PEEK plate above. We will try changing it next week.
- We adjusted the F0 keystone trim mass and were able to get it to sit at CAD nominal height at nominal temperature (24.9°C) with mid-range FR and modest extra mass (413 g). Interestingly, we noticed that removing the arc weights and/or geophones reduced the load capacity by a few hundred grams.
- We measured the total range of the IP FRs in steps and set them to mid-range in preparation for tuning the IP frequency and (re-)centering the IP.
- SRM
- We borrowed an LED from SR2 and set the pitch of the SRM optic.
- We found the SRM front end had crashed and could not be properly reset by cycling the power from the web interface. Yamamoto-san eventually got it working for us, although it didn't seem to take more than restarting the user and IOP models.
- We sealed and retested the new geophones originally intended for SRM, but decided to use them on BS instead.
- We installed the two OL viewports. We also tried to install the camera viewport but we couldn't get the Cu gasket to sit in the recess, so we gave up and will probably reallocate the camera viewport to SR3 for now (where it will go on a different type of flange which we've had success with. Saito-san says that we can get help with the SRM flange from Mirapro on 1/28.
- SR3
- We opened the top of the tank briefly to inspect the configuration of the F0 FR, but didn't do any significant work.
- Hirose-san inspected inside the bottom part of the chamber and found some dust, so he recommended we wipe with Vectra-Alpha wipes (IPA-resistant type) and IPA. he gave us a powerful LED flashlight array and asked us to use it to look for dust in all the chambers.
- Etc
- We gave Simon a list of items we still need for the SRM OL. He seemed to think that they should be in stock at Kamioka and will help us look for them next Tue 1/15.
- Mark and Enzo booked flights for the KAGRA International Workshop.
- Mark had to schedule a trip to Australia for the week of 1/21 to attend to family business.
To-Do Lists, Schedule
Plan for week of 1/7
- Make sure BS is floating, recenter OL to capture current yaw position.
- Vent BS.
- Inspect BS F0 blades for cracks.
Install new BS F0 FR, and (if necessary) auxiliary CuBe spring.
- Confirm geometry of LVDTs, geophones, FRs etc and update T1707205 if necessary.
- Replace geophone preamps and cables (to fix noise, offset, pinout flip issues).
- Add more mass to IP to get lower frequency.
- Adjust all GAS filters to near mid-range (using keystone mass for F0 as much as possible, and FR+LVDT for SF and BF).
Vacation/Etc Info
- Mark and Enzo: KAGRA International Workshop in Perugia, 2/14-16.
- Terrence: back at Kamioka from 1/7.