Agenda/Minutes of the VIS Meeting on 2017/2/17

2017/2/17 13:30 -

Participants:

Progress report

Schedule Chart : (PDF,MPP)

Installation in Y-end:

13th(Mon)

Installed the protection net to the bottom of cross tube.
Released the keystone of BF. The weight of dummy payload was near the optimal load of BF.

14th(Tue)

15th(Wed)

16th(Thu)

Cariblated the LVDT on BF.
Checked the range of FR on BF. It was about 2mm. Additional blades are necessary.

MISC

The setup of EQ stop for prototype test was withdrawn from ATC on 17th.
The 3.3m maraging wire will be treated at Himeji facility of Kinzoku-giken. It takes one month.

Hirata-san:
- Worked on the PR optic removal jig.
- Worked on getting modified quotes for PR/SR/BS parts.
Enzo-san
- Worked on getting his drivers license.
- Worked on getting familiar with the Type B circuit diagram.
Mark, Fabian (at Kamioka):
- Tried different strategies for getting the IRM-IM EQ stops and IRM OSEMs to line up simultaneously.
- Realized that the main problem was that the pitch of the BS had changed relative to the IM (presumably due to slight slippage of the wires) so the IM had to be pitched up by 16 mrad to get the BS pitched slightly down (4.7 mrad).
- Took the sides off the IRM to get access to the clamps and tightened them to prevent further slips.
- Rebalanced the IM to be level in pitch (and roll).
- Reassembled the IRM and aligned the IRM-IM EQ stops - this time it was easy.
- Adjusted the IRM and RM OSEMs to mid-range.
- Got Kokeyama's new real-time model working and started TFs.

Checked the optical bench suspension parts
- Optical bench magnetic damper is in Akeno, delivered on Feb. 27th.
- Jigs to arrange magnets on the optical bench magnetic damper is not designed nor procured.
- Diameter of the head of the suspension rods are different from what we ordered. -> Asking company to make the correct ones.
- Hooking screws cannot go smoothly even they are SDC coated. -> Asking to make the new ones loosely.
- Cu plates for eddy current damping are oxidized so much. They do not look clean. just covered by bubble packs.
Assembled the whole stages
- Not suspended yet.
- Found the holes for suspension rods are too small. The company made a mistake on the drawing update.
  - Two plates at Kamioka will be sent to the company. The other plate was re-machined at Mitaka.
- Cabling around BF takes a lot of time...
BF LVDT temporally circuits were made by Miyo-kun, Someya-san, and Hashimoto-san.
Second test assembly of BFRM at Mitaka
- ATC re-machined the holes for suspension rods. -> Will be sent to Kamioka.
- BFRM was properly suspended.

Suspend BF & BFRM
- Adjust weight of the BF
- place the ballast masses and balance it
- Set LVDT coils on BFRM and check signals
Traverser parts will be replaced by Uraguchi-san

Items that have been delivered.
- PCB + Metal mask( for Main board(WSD) )
- Cream solder
Redesign(Front panel board for Main 4ch WDS Box and front panel for Ex-I/O Box)Adjust the spacing of the front panel conectors.
- Project-WDS Peripheral circuit PCB Design Ver2(Summary)PDF JGW-E1706266
- Project-WDS Peripheral circuit PCB Design Version 2(Detail)PDF JGW-E1706265
- Project-WDS Ex-I/O PCB Design Ver 1(Summary)PDF JGW-E1706268
- Project-WDS Ex-I/O PCB Design Ver 1(Detail)PDF JGW-E1706267

I'm planning to perform surface mounting for Power board(WDS Main 4ch Box) in reflow furnace in Akihabara.Since a large PCB size( 320mm * 100mm) is required,a large reflow furnace is necessary,so it can be borrowed in Akihabara(DMM-make site.And of course,paid).
- ref Peripheral board(Power)PDF
- ref Reflow furnaceJapanese

On 2017/2/24(Fri) in Mitaka

March VIS F2F: March 3