iKAGRA ETM suspension preparation log

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.)

• 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 [Takahashi-san, Tatsumi-san] (Delivered to Kamioka on 4th Feb.)

• coil bobbin

• 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.

4.2 Coil winding [Kuwahara-san, and Ushiba-san from U-Tokyo, Lee-san from Okazaki, and Ohishi](8th-16th Feb.)

• 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 [Takahashi-san]

• 
  

• 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

• We used CLIO magnet fixture jigs.

Attach magnets to dummy mirror (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]

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• 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

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

10. Preparation of End area and suspension transportation to the End [Prof. Kimura, Sawada-san, Tomaru-san(KEK),]

• KEK

11. Installation