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Size: 2665
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| ==== Report for week of 5/28 ==== * Enzo and Mark debugged the BS BIO connections and finally got it working. There were a total of four issues identified: * A wrong block used in the BS real-time model. * The real-time model deciding to treat the cards as numbered backwards from the slot order or the jumper settings. * Two unlabeled cables that may have been swapped. * The GAS coil driver and associated cables had been labeled HPCD #1 whereas it had been #0 in the diagram. * Hirata-san and Kozu-kun received the final F0 blades, characterized 6 of them and, with help from Takahashi-san, installed a matched set of 3 into PI #3. It appears to be 6 kg short of the load capacity that was targeted, but still with 4 kg of margin. It is close to having a good frequency but needs another round of tuning. * Mark and Terrence fixed an issue with the security structure - due to a screenshot of the CAD not updated from the BS procedure to the SR one, the BF ring had been placed 180° off in yaw. We suspended the BF from the load gauge adapter, reconfigured the BF jacks to support the ring instead of the BF, and rotated the ring. Mark corrected the procedure. |
==== Report for week of 6/18 ==== * We powered down the Type B racks as a precaution against possible loss of power during work on Tuesday, and later powered them up again. * We put a flange cover over the hole in the floor near the filter tuning area as a temporary safety measure. We later managed to entirely close the part of the hole that was not covered by the filter, by moving the filter towards the outside and using short floor panels from SR2 on the tank side. * We removed the SR3 PI from the filter tuning area and brought in the SR2 one. * We put magnets on the SR damper magnet ring to match the two Cu segments we were using. * We craned the SR3 PI into the AF, connected it to the security structure, and hooked the SF/... section and the SF damper magnet ring. * At first the F0 did not rise, and we realized that we had 2 kg less margin than we originally thought because we had not allowed for the PI-SF rod receptacle, the top disk which holds the yaw stepper mechanism, or the stepper itself. * However we were able to try the redesigned PI fishing rod, parts for which had just arrived. The optional strong CuBe spring in the new arrangement gave plenty of extra lift, so that we now have about 5 kg of margin. We did have to move the yoke to work around the problem that the CuBe spring tends to tilt the keystone, but we got it moving freely. We will also have to compress the blades some more to compensate for the extra stiffness, which caused the frequency to rise from 0.5 Hz to 0.9 Hz. |
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| ==== Plan for week of 6/11 ==== * Mark Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Tue-Fri (Mon is compensation day for f2f.) |
==== Plan for week of 7/2 ==== * Mark, Hirata-san, Terrence at Kamioka Mon-Fri. * Enzo at Kamioka Mon-Wed. * Kozu-kun at Kamioka except Wed. |
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| * Route cables through SF-BF flying saucer up to bottom of SF. * Add minimal ballast mass to SF (rough balance only) and weigh SF/... section. * Adjust BF trim mass. * Readjust payload. * Take TFs. * Cable, test SF LVDT and FR. * Add calculated ballast to SF. * Finish tuning F0 #3 for SR3. * Park F0 #1 (for SR2) in top of SR3 assembly frame. * Move F0 #3 behind SR3. * Move F0 #1 to "factory" area (in front of SRM) and start rebuild. |
* Continued tuning of filter in PI #3 for SR3. * Building and tuning of filter in PI #1 for SR2 (time permitting). * Lots of cable routing and testing. * Install geophones and arc weights. |
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| ==== Plan for week of 6/18 ==== * Mark Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri. |
==== Plan for week of 7/9 ==== * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri. |
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| * Install PI. * Suspend SF/... section. * Lots of cabling. |
* Lock suspension. * Remove tank lid and raise LBB damper rings. * Crane suspension into tank. |
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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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| * Kozu-kun: 7/4 Tokyo. * Enzo: 7/5-6 NAOJ Party, Mitaka. * Terrence: 8/24-26 f2f, then returns to Hong Kong. * Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 6/18
- We powered down the Type B racks as a precaution against possible loss of power during work on Tuesday, and later powered them up again.
- We put a flange cover over the hole in the floor near the filter tuning area as a temporary safety measure. We later managed to entirely close the part of the hole that was not covered by the filter, by moving the filter towards the outside and using short floor panels from SR2 on the tank side.
- We removed the SR3 PI from the filter tuning area and brought in the SR2 one.
- We put magnets on the SR damper magnet ring to match the two Cu segments we were using.
- We craned the SR3 PI into the AF, connected it to the security structure, and hooked the SF/... section and the SF damper magnet ring.
- At first the F0 did not rise, and we realized that we had 2 kg less margin than we originally thought because we had not allowed for the PI-SF rod receptacle, the top disk which holds the yaw stepper mechanism, or the stepper itself.
However we were able to try the redesigned PI fishing rod, parts for which had just arrived. The optional strong CuBe spring in the new arrangement gave plenty of extra lift, so that we now have about 5 kg of margin. We did have to move the yoke to work around the problem that the CuBe spring tends to tilt the keystone, but we got it moving freely. We will also have to compress the blades some more to compensate for the extra stiffness, which caused the frequency to rise from 0.5 Hz to 0.9 Hz.
Plan for week of 7/2
- Mark, Hirata-san, Terrence at Kamioka Mon-Fri.
- Enzo at Kamioka Mon-Wed.
- Kozu-kun at Kamioka except Wed.
- --
- Continued tuning of filter in PI #3 for SR3.
- Building and tuning of filter in PI #1 for SR2 (time permitting).
- Lots of cable routing and testing.
- Install geophones and arc weights.
Plan for week of 7/9
- Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
- --
- Lock suspension.
- Remove tank lid and raise LBB damper rings.
- Crane suspension into tank.
To-Do Lists, Schedule
Vacation Info
- Kozu-kun: 7/4 Tokyo.
- Enzo: 7/5-6 NAOJ Party, Mitaka.
- Terrence: 8/24-26 f2f, then returns to Hong Kong.
- Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.