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Size: 1822
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Size: 2841
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
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| ==== Report for week of 12/25 ==== * Hirata-san got the L-brackets machined and washed, and installed them on the IM ring bars. * Shoda-san recovered the BS from the power outage on 12/25. * Miyakawa-san fixed an issue with the SR2 RTM which had prevented it from running. * Shoda-san, Hirata-san and Kozu-kun weighed the IM without ballast masses, and then added the lower masses and installed the IM on the assembly frame. * They cleaned the assembly frame and installed new jack receptacles on the load gauge adapter. * They installed the winch system on the IM, and inspected the clamp pieces for possible scratches. * They ran cables for the SR2 steppers and OSEMs. * They calibrated the BF LVDT. |
==== Report for week of 5/7 ==== * We inspected the wires and clamps involved in the wire break. * The scars on the clamp on the tungsten wire that failed had very different depths, with the one that failed being much deeper, so probably the clamp piece was not completely straight before tensioning. However one wire on the other side was also badly crushed and on the point of failing, so the tension was clearly too much. * We decided on new torque specs of 2 N.m for the primary clamps (down from 5 N.m) and 10 N.m (down from 20 N.m) for the secondary. The secondary clamp spec, for M6 screws, is now based on the LIGO policy of using the maximum suggested for the screw and the LIGO value for a coated 1/4-20 screw (100 in-lb = 11.3 N.m), and the primary clamp spec is derated by 2/3 from the spec for an M5 screw because the clamp pieces are recessed and only grip the wire at narrow sections along the edges, concentrating the force. * None of the screws showed any signs of damage. * All of the scars on the primary clamps were shallow enough that could reuse the clamp pieces. The tungsten secondary clamps were never tightened, and the outer pieces of piano wire secondary clamps were badly scarred but could be reused upside down. * We successfully rehung the SR3 and RM. In the process we noticed and fixed an issue with the assembly frame (due to an out-of-date number in the Mirapro diagram, the IM crossbars were set 3 mm too high, which would have affected the wire length). * We added the sections of the security structure below the RM and up to the BF. * We installed the TM OSEM cables and routed them up to the IM. * We installed the load gauge adapter and load gauge and prepared the IM/... section for weighing. * We removed the three cracked F0 blades from the PI #3 in the SRM, and prepared for testing prototype new blades in that PI. We removed a floor panel under the PI and set up the filter service trolley underneath it with a stack of masses for a dummy load. |
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| ==== Report for week of 1/4 ==== * Mark fixed a number of errors with the Type B screens. |
==== Plan for week of 5/14 ==== * Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Mon-Thu, then Osaka. * |
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| ==== Report for week of 1/9 ==== * We weighed the mirror in its box (and later the empty box), and the RM. * Fabian worked on the SR2/SR3/SRM mass budget and did an inventory of spare ballast masses. * We hung the SR2 and RM. * We assembled the bottom section of the security structure below the RM. * Hirata-san gave up on waiting for a third quote for the blades and blade parts and started the ordering process. * Hirata-san got rod cable clamp parts from Takahashi-san and worked on drawings for the improved BS vertical and yaw adjusters. |
==== Plan for week of 5/21 ==== * Mark, Enzo, Hirata-san, Kamioka Mon-Fri. * Kozu-kun at Kamioka Wed-Fri. |
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| ==== Plan for week of 1/15 ==== * Shoda-san at Mitaka making OSEMs. * ==== Plan for week of 1/22 ==== ==== Plan for week of 1/22 ==== * Mark, Fabian, Enzo, Shoda-san at Kamioka Tue-Fri. * Hang SR and RM. |
==== Plan for week of 5/28 ==== * Mark, Enzo, Hirata-san, Kamioka Mon-Fri. * Kozu-kun at Kamioka Mon only. ==== To-Do Lists, Schedule ==== * [[KAGRA/Subgroups/VIS/TypeB/March2018]] * [[KAGRA/Subgroups/VIS/TypeB/April2018]] * [[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-v1 Type B Schedule (SR)]] |
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| * Enzo 1/30-2/19 (at Mitaka 1/29, part of 1/30) * Kozu-kun 1/29-2/2 |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 5/7
- We inspected the wires and clamps involved in the wire break.
- The scars on the clamp on the tungsten wire that failed had very different depths, with the one that failed being much deeper, so probably the clamp piece was not completely straight before tensioning. However one wire on the other side was also badly crushed and on the point of failing, so the tension was clearly too much.
- We decided on new torque specs of 2 N.m for the primary clamps (down from 5 N.m) and 10 N.m (down from 20 N.m) for the secondary. The secondary clamp spec, for M6 screws, is now based on the LIGO policy of using the maximum suggested for the screw and the LIGO value for a coated 1/4-20 screw (100 in-lb = 11.3 N.m), and the primary clamp spec is derated by 2/3 from the spec for an M5 screw because the clamp pieces are recessed and only grip the wire at narrow sections along the edges, concentrating the force.
- None of the screws showed any signs of damage.
- All of the scars on the primary clamps were shallow enough that could reuse the clamp pieces. The tungsten secondary clamps were never tightened, and the outer pieces of piano wire secondary clamps were badly scarred but could be reused upside down.
- We successfully rehung the SR3 and RM. In the process we noticed and fixed an issue with the assembly frame (due to an out-of-date number in the Mirapro diagram, the IM crossbars were set 3 mm too high, which would have affected the wire length).
- We added the sections of the security structure below the RM and up to the BF.
- We installed the TM OSEM cables and routed them up to the IM.
- We installed the load gauge adapter and load gauge and prepared the IM/... section for weighing.
- We removed the three cracked F0 blades from the PI #3 in the SRM, and prepared for testing prototype new blades in that PI. We removed a floor panel under the PI and set up the filter service trolley underneath it with a stack of masses for a dummy load.
Plan for week of 5/14
- Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Mon-Thu, then Osaka.
Plan for week of 5/21
- Mark, Enzo, Hirata-san, Kamioka Mon-Fri.
- Kozu-kun at Kamioka Wed-Fri.
Plan for week of 5/28
- Mark, Enzo, Hirata-san, Kamioka Mon-Fri.
- Kozu-kun at Kamioka Mon only.
To-Do Lists, Schedule