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| ==== Report for week of 8/13 ==== * KAGRA was closed Mon/Tue 8/13-14 due to O-Bon. * 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 the week of 3/18 ==== * BS * Terrence notice that one of the IP LVDTs was not working. We traced it to an unplugged cable, plugged it back in and screwed it together to prevent a recurrence. * Simon helped us rebuild the damaged LEN OL QPD stage and Terrence reinstalled it. We removed a C-clamp that we had been using to immobilize the breadboard because it interfered with the QPD stage, and replaced it with a more elegant solution using a dog clamp underneath. * We noticed that the BS IP had fallen over in +L at some time shortly before Nakano-san aligned the optic on 3/18. Terrence tried to recenter it but it was unstable. We decided to remove the tank lid one more time and remove some arc weights. The IP frequency had been 39 mHz the last time it was measurable, and we increased it to a much-safer 80 mHz by removing 9 kg. We believe we were able to recover Nakano-san's alignment fairly closely. * Terrence then recalibrated and diagonalized both the TILT and LEN OL. * SR2 * Terrence recalibrated the OL. * SR3 * Mark pulled out unused cables leading into the SR3 cleanbooth. * SRM * Terrence set up the SRM Guardian. * Etc/All * Mark did an audit of the OL whitening/dewhitening system and fixed a bunch of problems: the SRM chassis was the wrong type, with no actual whitening card; SR2 and SRM needed whitening filters turned on; BS LEN needed the dewhitening turned on; SR2, SR3 and SRM needed dewhitening filters installed and turned on; SRM needed more gain. * Terrence weeded out a minor error from his OL diagonalization scheme and got L, T and Y independent at the 1% level for SR2 and SRM. He will do SR3 next. * Fabian measured the gain resistor values and other settings of the LVDT drivers, in case a card or chassis fails and we have to approximate the original state without the chance to recalibrate from scratch. * Fabian monitored the pumpdown. |
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| ==== 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. |
==== Plan for week of 3/25 ==== * Mark, Fabian, Terrence at Kamioka Mon-Thu. * Assist with alignment. * Work on Type B paper. * Tidy up. * Throw out foil and other garbage. * Gather and clean tools. * Gather and organize unused parts and fasteners. * Return all unused cables to tent. * Tidy up cables in rear of SR2 rack. |
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| ===== 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 ==== ===== SR3 ===== * 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) with almost no spare for tuning. * Using SR3, we did a quick study of the IP frequency as a function of the number of arc weights, to see how much more we might need. 3 pairs of small arc weights (10 mm thick, 4.53 kg each) brought the frequency below 0.1 Hz, 4 pairs made it unstable. If SR3 is typical we would need about 27 kg extra per suspension. * After the IP study, we left three pairs of 10 mm arc weights installed on the IP for more investigation with the digital system (instead of a stopwatch). ''RESULTS.'' ===== SR2 ===== * We finished routing the in-vacuum cables, and connected everything through to the rack for final testing. * We brought a basic 103.2 kg set of arc weights (3 large (38 mm) and 6 medium (19 mm)) into the SR2 cleanbooth. ===== SRM ===== * Panwei calibrated 6 OSEMs to be used on the IM. * We brought in all the remaining arc weights from the pallet into the SRM cleanbooth, and Hirata-san cleaned up 1 large arc weight and 3 mediums left over from the BS that complete a basic set of 103.2 kg, plus about 5 kg spare. (However 27 kg of these are on loan to SR3.) * We assembled and installed the bottom section of the security structure under the optic and RM. * We set up a new OL for setting the pitch. We found the reflection off the AR surface was much weaker than for SR2 and SR3, but fortunately the HR surface is almost flat (ROC≈300 m) so we were able to use the HR reflection instead. * ''We set the pitch of the SRM and RM and tightened the wire clamps.'' ==== Plan for week of 9/3 ==== * Mark, Enzo, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Mon-Fri. * (Mark possible trip to LIGO Hanford - TBD.) ===== SR2 ===== * Crane in SR2. * Move SR2 in-air cables. * Remove First Contact. ''DO WE NEED TO GET THE DUCT MOVED FIRST???'' * Unlock and realign payload. ===== SRM ===== * ===== Etc ===== * Prepare for scheduled power outage on 9/10. ==== Plan for week of 9/10 ==== * Monday 9/10 is scheduled power outage. * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri. * Enzo at Kamioka Tue-Thu, then JPS Meeting Fri, then vacation. * (Mark possible trip to LIGO Hanford - TBD.) * Recover from power outage. ==== Plan for week of 9/17 ==== * Monday 9/17 is holiday (Respect for the Aged Day). * Enzo on vacation. * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri. ==== Plan for week of 9/24 ==== * Monday 9/24 is holiday (Autumn Equinox). * Mark, Hirata-san, Fabian, Kozu-kun, Panwei at Kamioka Tue-Fri. ==== 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)]] ==== 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. |
==== Vacation/Travel Info ==== * Enzo's final vacation till 3/29. * Terrence's last day for now, 3/29. * Mark compensation day for 3/21: 3/29. * Type B going-away party for Terrence/Enzo, 3/29 in Tokyo. * Terrence's next visit from 4/18. * Fabian's vacation 4/26 to 5/10. * Mark's final day ≈6/28 (TBD). |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for the week of 3/18
- BS
- Terrence notice that one of the IP LVDTs was not working. We traced it to an unplugged cable, plugged it back in and screwed it together to prevent a recurrence.
- Simon helped us rebuild the damaged LEN OL QPD stage and Terrence reinstalled it. We removed a C-clamp that we had been using to immobilize the breadboard because it interfered with the QPD stage, and replaced it with a more elegant solution using a dog clamp underneath.
- We noticed that the BS IP had fallen over in +L at some time shortly before Nakano-san aligned the optic on 3/18. Terrence tried to recenter it but it was unstable. We decided to remove the tank lid one more time and remove some arc weights. The IP frequency had been 39 mHz the last time it was measurable, and we increased it to a much-safer 80 mHz by removing 9 kg. We believe we were able to recover Nakano-san's alignment fairly closely.
- Terrence then recalibrated and diagonalized both the TILT and LEN OL.
- SR2
- Terrence recalibrated the OL.
- SR3
- Mark pulled out unused cables leading into the SR3 cleanbooth.
- SRM
- Terrence set up the SRM Guardian.
- Etc/All
- Mark did an audit of the OL whitening/dewhitening system and fixed a bunch of problems: the SRM chassis was the wrong type, with no actual whitening card; SR2 and SRM needed whitening filters turned on; BS LEN needed the dewhitening turned on; SR2, SR3 and SRM needed dewhitening filters installed and turned on; SRM needed more gain.
- Terrence weeded out a minor error from his OL diagonalization scheme and got L, T and Y independent at the 1% level for SR2 and SRM. He will do SR3 next.
- Fabian measured the gain resistor values and other settings of the LVDT drivers, in case a card or chassis fails and we have to approximate the original state without the chance to recalibrate from scratch.
- Fabian monitored the pumpdown.
Plan for week of 3/25
- Mark, Fabian, Terrence at Kamioka Mon-Thu.
- Assist with alignment.
- Work on Type B paper.
- Tidy up.
- Throw out foil and other garbage.
- Gather and clean tools.
- Gather and organize unused parts and fasteners.
- Return all unused cables to tent.
- Tidy up cables in rear of SR2 rack.
Vacation/Travel Info
- Enzo's final vacation till 3/29.
- Terrence's last day for now, 3/29.
- Mark compensation day for 3/21: 3/29.
- Type B going-away party for Terrence/Enzo, 3/29 in Tokyo.
- Terrence's next visit from 4/18.
- Fabian's vacation 4/26 to 5/10.
- Mark's final day ≈6/28 (TBD).