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| * Type B Past Week Summary * Fabian, Mark, Yokogawa-kun and Kuwahara-kun did BS installation at Kamioka: * Calculated BS pitch correction ([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5630|JGW-T1605630]]) * Hung dummy optic and set pitch. * Prepared RM for hanging (adding OSEMs etc). One OSEM (#24) had wobbly leads and was brought back to Mitaka for rework. * Placed vacuum feedthroughs on assembly frame and cleaned initial batch (4) of D-Sub cables. * Decided position of BS rack with Miyakawa-san. * Measured various maraging rods and the rod holders on the SF. * Placed safety rails, rearranged floor panels, cleaned new floor panels, and otherwise improved safety. * Hirata-san: * Made new 3D models of the maraging rods for PRx and SRx * Made new collet design for PRx and SRx (3D and 2D). * Made new IM flag design for PRx and SRx (3D and 2D). * Washed lots of Type A BF parts and OSEM parts. * Cleaned the BS BF-IM maraging rod and organized the rest of the stock of rods. * Measured some BF part dimensions. * Pre-assembled parts for BFs. * Type B ongoing issues * Longer term to-do list * Do Inventor assembly for SR2 in chamber and on assembly frame (Hirata) - NEARLY DONE. * Part "disk security" top has to be modified - screw positions do not match. * Write more of payload assembly procedure (Fabian) - ONGOING * Write more of BS Assembly Procedure [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4235| E1504235]], [[https://onedrive.live.com/redir?resid=D5CCFA70A378E0D0!195&authkey=!AM_usynuo9QI57g&ithint=folder,webloc|E1504235 draft]] (Mark) - ONGOING * Lower breadboard installation to be incorporated into the procedure document. * Work on BS simulation (Fabian) * Do BS Simulink model (Mark, Kokeyama) * Do 2D drawings of SR2 parts (Hirata) * Redesign SRx IM wire clamps for larger prisms, remachined RMs * Order SRM/PRM parts (Hirata/Shoda) * Order SRx fasteners (Hirata) |
* Hirata-san: * Received many parts from i-ject for BFRM (took pictures and took them into ATC cleanroom). * got quotes for PRM/SRM payload from i-ject. * Checked quotes and asked for some modifications.) * Washed parts (parts for type-A, small hexagons, screws, etc\) * Wiped 9 piano wires and sent to Kamioka for PR. * pdated Fabian's EQstop parts for BS recoilmass and updated EQstop assy drawings. * Fabian * Worked out geometry for blade adjustment. * Designed additional ballast masses for BS BF (and SR). * Mark and Enzo (at Kamioka) * Did two rounds of adjustment of the blades with help from Takahashi-san (one for position, one for frequency) * Surveyed the position of the rod using the vertical mode of the bubble level. * Got apparent improvement as judged at the IRM-IM EQ stops (but still not perfect). * Did one more round of blade adjustments (without Takahashi-san) * Got good agreement with IRM-IM EQ stops, so put BF cap on and raised the whole system to check for balance. * Found balance still fairly bad: about the same on the -X,+Y diagonal and about half on the +X,+Y diagonal (70 and 30 mm worth of motion of a single trim mass respectively; previous a bit over 70 mm each). * From the imbalance torques, calculated the offset of rod as 2.3 mm in the direction 22 degrees to the +X side of -Y. * Calculated the blade adjustments required: {-0.325194, -1.79175, 2.11695} mm * Prepared to apply adjustments (removed cap etc). |
Scraps of text for incorporation in the VIS Meeting Minutes
KAGRA/Subgroups/VIS/MeetingNAOJ
- Hirata-san:
- Received many parts from i-ject for BFRM (took pictures and took them into ATC cleanroom).
- got quotes for PRM/SRM payload from i-ject.
- Checked quotes and asked for some modifications.)
- Washed parts (parts for type-A, small hexagons, screws, etc\)
- Wiped 9 piano wires and sent to Kamioka for PR.
- pdated Fabian's EQstop parts for BS recoilmass and updated EQstop assy drawings.
- Fabian
- Worked out geometry for blade adjustment.
- Designed additional ballast masses for BS BF (and SR).
- Mark and Enzo (at Kamioka)
- Did two rounds of adjustment of the blades with help from Takahashi-san (one for position, one for frequency)
- Surveyed the position of the rod using the vertical mode of the bubble level.
- Got apparent improvement as judged at the IRM-IM EQ stops (but still not perfect).
- Did one more round of blade adjustments (without Takahashi-san)
- Got good agreement with IRM-IM EQ stops, so put BF cap on and raised the whole system to check for balance.
- Found balance still fairly bad: about the same on the -X,+Y diagonal and about half on the +X,+Y diagonal (70 and 30 mm worth of motion of a single trim mass respectively; previous a bit over 70 mm each).
- From the imbalance torques, calculated the offset of rod as 2.3 mm in the direction 22 degrees to the +X side of -Y.
- Calculated the blade adjustments required: {-0.325194, -1.79175, 2.11695} mm
- Prepared to apply adjustments (removed cap etc).