iKAGRA ETM suspension preparation log

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

Disassembling at ATC Mitaka [Ohishi] (12th-19th Jan.)

• Two nuts stuck. Hirata-san removed them.
• A Cu screw stuck. Hirata-san removed it.

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.

New parts

• Coil bobbin [Takahashi-san]

  • coil bobbin

• Coil winding [Kuwahara-san, and Ushiba-san]
  • Coil wires from the bobbin to Dsub connector were too short(20cm). The length must be 40cm or more.
  • At the end of coil wires, D-sub pins are swaged. We have run short of pins and waiting for delivery on 29th Feb.
  • Peeling off the coating of wires longer than the length of those pins make the wire broken easily.
• D-sub fixture plates [Takahashi-san]
  • M3 holes were drilled to phi3.2 holes.
• Mirror container [Tatsumi-san]

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• Magnets for dummy mirror (4 ; 2-phi-L-5mm Nd magnets) [Tomaru, Yamamoto]
• Screws in replace with Cu screws [Ohishi] [problem] replaced all Cu screws to stainless. Magnetism problem was indicated.

Pico-motors and PZTs

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

Coil driver

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

Cables

Assembling [Tomaru-san, Ohishi, Yamamoto-san]

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

Hanging

• Hanging jig preparation

Transfer Function Measurement

==== Transportation to the End [Prof. Kimura, Sawada-san, Tomaru-san(KEK),]====

• KEK

Mirrors

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

Installation