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| * Type B Past Week Summary * Mark and Hirata-san worked at Kamioka, with valuable help from Enzo (on loan from Type Bp team). * We got all the adapter cables for the BF made (Hirata-san did some work on Monday at Mitaka). * We installed the extension for the BF yaw pico on the IM pico adapter cable. * We got all the in-vacuum and in-air cabling for the IM OSEMs done. * We tried to install the stepper and LVDT adapter cables but realized we didn't have enough information on which wires was which. (We later tracked this info down but did not have time to do anything with it - we would have needed to do the rest of the in-vacuum and in-air cabling and set up the stepper motor and LVDT drivers, so we concentrated on the OSEMs.) * We plugged in the IM OSEMs, set gains and offsets, and did a noise test (analysis and klog pending). * We mounted the OSEMs on the IRM and routed the cabling neatly. * We released the suspension. * We adjusted the OSEM mounting plates to center the OSEMs on the flags. * We adjusted the OSEMs in/out to midrange. * The suspension is now ready for OSEM-OSEM TFs! |
* Hirata-san: * Made BS disposable wire clamp 3Dmodel and drawings. * Made ballast mass drawings for BS Bottomfilter and Standardfilter. * Made parts list and screw list for disposable wire clamp and ballast mass. * Sent drawings and lists to i-ject for quotation. * Start to make drawings for SR big parts (optical bench,damper rings,sus wires,cable clamps) - ongoing. * Mark, Fabian and Enzo (at Kamioka): * Realized that some of the imbalance in the BF was from the fishing rod and calculated a new set of blade offsets to center the rod but leave the torque from the FR to be cancelled by the trim mass for now. * Applied the blade offsets and checked that the BF hung as expected. * Found that the yoke was rubbing again and corrected it by putting it at an angle matching the keystone. * Found that the cables were adding too much stiffness and friction and rerouted them. * Found that the GAS was unstable and reduced the compression symmetrically to get 0.37 Hz. * Rebalanced the IM to set the right pitch, yaw and height. * Tested the IM picos. Unfortunately the pitch pico stuck near or at one end of its range and we will need to take the end plate off the IM to find out what is wrong. |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
- Hirata-san:
- Made BS disposable wire clamp 3Dmodel and drawings.
- Made ballast mass drawings for BS Bottomfilter and Standardfilter.
- Made parts list and screw list for disposable wire clamp and ballast mass.
- Sent drawings and lists to i-ject for quotation.
- Start to make drawings for SR big parts (optical bench,damper rings,sus wires,cable clamps) - ongoing.
- Mark, Fabian and Enzo (at Kamioka):
- Realized that some of the imbalance in the BF was from the fishing rod and calculated a new set of blade offsets to center the rod but leave the torque from the FR to be cancelled by the trim mass for now.
- Applied the blade offsets and checked that the BF hung as expected.
- Found that the yoke was rubbing again and corrected it by putting it at an angle matching the keystone.
- Found that the cables were adding too much stiffness and friction and rerouted them.
- Found that the GAS was unstable and reduced the compression symmetrically to get 0.37 Hz.
- Rebalanced the IM to set the right pitch, yaw and height.
- Tested the IM picos. Unfortunately the pitch pico stuck near or at one end of its range and we will need to take the end plate off the IM to find out what is wrong.