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[[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|iKAGRA_ETM]]

iKAGRA ETM suspension preparation log

iKAGRA_ETM

1. Schedule

  • 12th Jan- (2 weeks) Disassembling, Washing, and transportation
  • 25th Jan - (2 weeks) Assembling and Test Hanging with an Al dummy mirror
  • 7th Feb- (1 week) coil winding, measurement of transfer function, transportation to the End area and installation test
  • 15th Feb- (1 week)installation

2. Disassembling in the ATC clean booth at Mitaka (12th-19th Jan.)

  • One suspensions was moved from the desiccator at the west end of TAMA and the other was moved from the vacuum tank.
  • Two nuts stuck. Hirata-san removed them.
  • A Cu screw stuck. Hirata-san removed it.

3. Washing and transportation to Kamioka

[Hirata-san]

  • The ultra sonic washer at ATC was broken on 20th Jan.
    A new washer was ordered on 22th(Fri) and arrived at Mitaka on 25th(Mon).

  • Eight screws for adjusting the IM holding plate was dirty.
    Takahashi-san ordered similar screws.

4. New parts preparation

4.1 Coil bobbin (Delivered to Kamioka on 4th Feb.)

[Takahashi-san, Tatsumi-san]

  • The outer diameter of the coil has been changed from 14.2mm to 14.5mm.
  • Due to this change, the number of winding becomes 39 from 41.
  • Wind 13 times / 1 layer.

4.2 Coil winding (8th-16th Feb.)

[Kuwahara-san, and Ushiba-san from U-Tokyo, Lee-san from Okazaki, and Ohishi]

  • We used coil winding machine.
  • Lead wires from the bobbin to Dsub connector were too short (20cm). The length must be 40cm or more.
  • At the end of the lead wires, D-sub pins are swaged. We have run short of pins and waiting for delivery on 29th Feb(Mon).
  • Peeling off the coating of wires longer than the length of those pins make the wire broken easily.

4.3 D-sub connector plates (8th Feb.)

[Takahashi-san]

  • attachment:D-sub_connector_plate.pdf

  • M3 holes were changed to phi3.1 holes. Yamamoto-san used drilling machine at Kamioka surface office.
  • One must be careful about the pillar position in order to attach this plate to the suspension.

4.4 15pin-9pin changer for coil driver output [Ushiba-san, Ohishi]

4.5 Screws in replace with Cu screws

[Ohishi]

  • Replaced all Cu screws to stainless screws. Magnetism problem was indicated.

5. Jigs

5.1 Magnet and standoff fixture jig

  • We used

5.2 Dock (mirror hanging jig)

(4 ; with the diameter of 2mm and the length of 5mm NdFeB magnets) [Tomaru-san, Yamamoto-san]

6. Some other items

6.1 Pico-motors and PZTs

  • We have 4 pico-motors except for x-axis (the direction of the light ) y, z, pitch, yaw

6.2 Coil drivers

  • We use KAGRA coil driver; we need to cheek its performance.

6.3 Cables

6.4 Mirrors

  • Two TAMA PRM mirrors (with about 50% and 90% reflectivities each, resultant contrast becomes 96%) were delivered to Kamioka on 12th Feb.

6.5 Mirror container [Tatsumi-san]

  • Some plates once used for transportation of MC mirrors were used
  • Two places of the container were cut to avoid standoffs.

6.6 Stages

  • Condensation
  • Vacuum compatibility?

7. Assembling

[Tomaru-san, Ohishi, Yamamoto-san]

  • On 21th, suspension frame, security frame, xy stages completed

8. Hanging

[Yamamoto-san, Uchiyama-san, Doi-san, and Ohishi]

  • Hanging jig preparation

9. Transfer Function Measurement (8th-16th Feb.)

[Shoda-san, Hayama-san, Ushiba-san, Kuwahara-san, Kokeyama-san, Kuwahara-san, Tomaru-san, Lee-san, and Ohishi]

  • First Shoda-san kindly made a simple model under PR2 digital system for this test.

10. Preparation of End area and suspension transportation to the End

[Kimura-san, Sawada-san, Tomaru-san, Prof. Suzuki, Telada-san, Uchiyam-san]

  • Uchiyama-san bought many things we need at the end area and KEK member transported them and cleaned the work area.

11. Installation [Akutsu-san, Uchiyama-san, Yamamoto-san, Miyoki-san, and Ohishi ] (15th-17th Feb.)

11.1 Suspension installation

  • Suspension was installed by Miyoki-san, Akutsu-san and Yamamoto-san on 15th Feb at the Yend.
  • Suspension and mirrors were installed by at the Xend.

11.2 Mirror installation

KAGRA/Subgroups/VIS/Type-C (last edited 2020-04-30 12:05:11 by KousekiMiyo)