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| Deletions are marked like this. | Additions are marked like this. |
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| ==== 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 In the process we noticed and fixed an issue with the assembly frame (due to an out-of-date number in the Mirapro diagram, the IM crossbars were set 3 mm too high, which would have affected the wire length).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. * Mirapro installed the SRM mushroom. |
==== Report for week of 10/1 ==== ===== SR2 ===== * We solved a mystery with the height of the BF keystone: it turns out that running the table KOACH filters in the tank warms it up (by about 1.5°C) and causes significant sag (700 µm). D'oh! * We ran power to the pico drivers. * We got the lower section of the SR2 fairly well aligned with just a bit of adjustment with the IM pitch and roll picos. * We helped Lucia double-check the geometry of the IP - the current matrix calculation assumes the FRs and the LVDT sensors and actuators are colocated, which is much closer to true than for the BS, but not quite right. * We gave up on doing anything more with SR2 for now because we're waiting on extra extension cables for the PI and Fujii-kun will want to borrow one of the geophones next week for a huddle test with new geophones. ===== SRM ===== * We set the pitch of the SRM and RM, tightened the clamps and removed the winch system. * We installed the BF crossbars of the assembly frame and the BF ring section of the security structure. * We lifted the IM/... section on the load gauge to find its weight. * We craned in the BF and removed the cap. * We installed the BF-IRM rods and the IRM top plate. * We installed the BF-IM maraging rod and flying saucer cable clamps. * We suspended the IM/... section and adjusted the trim masses for balance and total mass. It took quite a lot of adjustment in each of pitch, roll and vertical. The vertical was due to the fact that the weight of the IM/... section is very close to that of SR2/SR3 but the SRM BF is about 0.5 kg weaker. The roll was due to the fact that the default configuration of trim mass had no correction for the horizontal wedge on the optic. However the pitch is a bit of a mystery - nearly all of the removed mass had to come off the AR side. Fortunately we were able to correct for it entirely with masses we had in hand. * We routed the TM OSEM cables via the flying saucer up to the underside of the BF. * We got 2 power supplies from Shimode-san so we can fire up the SRM rack next week. He will also supply suitable cables to connect the power supplies to the DC power strip in the rack. * We received the replated yoke for the SRM top filter. |
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| ==== Plan for week of 5/14 ==== * Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Mon-Thu, then Osaka. * Weigh IM/... section. * Characterize F0 blade prototypes. * Remove F0 blade prototypes (and send for rework if necessary). * Start characterizing LBB blades. * Crane in BF. * Add IRM top plate, maraging rod, flying saucer. * Suspend IM, check pitch, roll and vertical, adjust trim mass. * Cable and (re-)test TM OSEMs, IM picos, BF yaw pico, BF LVDT and FR. |
==== Plan for week of 10/8 ==== * Monday 10/8 is Sports Day. * Enzo returns Tuesday 10/9. * Mark and Terrence (plus TBD) at Kamioka Mon-Fri. * Enzo, Hirata-san, Fabian and Panwei at Kamioka Tue-Fri. ===== SR2/SR3 ===== * Terrence to set up LEN half of SR3 OL and, time permitting, TILT and LEN for SR2. ===== SRM ===== * Cable/test BF. * Install IRM. * Install/cable/test IM OSEMs. * Suspend/weigh/balance the BF/... section. |
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| ==== Plan for week of 5/21 ==== * Mark, Enzo, Hirata-san, Kamioka Mon-Fri. * Kozu-kun at Kamioka Wed-Fri. * Install IRM sides, and IM OSEMs. * Center IM OSEMs (in/out and laterally) * Route all cables to underneath BF. * Add BF internal ballast mass. * Add BF cap. ==== Plan for week of 5/28 ==== * Mark, Enzo, Hirata-san, Kamioka Mon-Fri. * Kozu-kun at Kamioka Mon only. * TBD. |
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| * [[KAGRA/Subgroups/VIS/TypeB/March2018]] * [[KAGRA/Subgroups/VIS/TypeB/April2018]] |
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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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| ==== Vacation Info ==== | ==== Vacation/Visitor Info ==== * Enzo: 9/15 through 10/8 vacation in Chile. * Terrence: 10/8-12, 10/29-11/2 at Kamioka. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
Type B (Mark)
Report for week of 10/1
SR2
- We solved a mystery with the height of the BF keystone: it turns out that running the table KOACH filters in the tank warms it up (by about 1.5°C) and causes significant sag (700 µm). D'oh!
- We ran power to the pico drivers.
- We got the lower section of the SR2 fairly well aligned with just a bit of adjustment with the IM pitch and roll picos.
- We helped Lucia double-check the geometry of the IP - the current matrix calculation assumes the FRs and the LVDT sensors and actuators are colocated, which is much closer to true than for the BS, but not quite right.
- We gave up on doing anything more with SR2 for now because we're waiting on extra extension cables for the PI and Fujii-kun will want to borrow one of the geophones next week for a huddle test with new geophones.
SRM
- We set the pitch of the SRM and RM, tightened the clamps and removed the winch system.
- We installed the BF crossbars of the assembly frame and the BF ring section of the security structure.
- We lifted the IM/... section on the load gauge to find its weight.
- We craned in the BF and removed the cap.
- We installed the BF-IRM rods and the IRM top plate.
- We installed the BF-IM maraging rod and flying saucer cable clamps.
- We suspended the IM/... section and adjusted the trim masses for balance and total mass. It took quite a lot of adjustment in each of pitch, roll and vertical. The vertical was due to the fact that the weight of the IM/... section is very close to that of SR2/SR3 but the SRM BF is about 0.5 kg weaker. The roll was due to the fact that the default configuration of trim mass had no correction for the horizontal wedge on the optic. However the pitch is a bit of a mystery - nearly all of the removed mass had to come off the AR side. Fortunately we were able to correct for it entirely with masses we had in hand.
- We routed the TM OSEM cables via the flying saucer up to the underside of the BF.
- We got 2 power supplies from Shimode-san so we can fire up the SRM rack next week. He will also supply suitable cables to connect the power supplies to the DC power strip in the rack.
- We received the replated yoke for the SRM top filter.
Plan for week of 10/8
- Monday 10/8 is Sports Day.
- Enzo returns Tuesday 10/9.
- Mark and Terrence (plus TBD) at Kamioka Mon-Fri.
- Enzo, Hirata-san, Fabian and Panwei at Kamioka Tue-Fri.
SR2/SR3
- Terrence to set up LEN half of SR3 OL and, time permitting, TILT and LEN for SR2.
SRM
- Cable/test BF.
- Install IRM.
- Install/cable/test IM OSEMs.
- Suspend/weigh/balance the BF/... section.
To-Do Lists, Schedule
Vacation/Visitor Info
- Enzo: 9/15 through 10/8 vacation in Chile.
- Terrence: 10/8-12, 10/29-11/2 at Kamioka.