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 in the ATC clean booth at 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, 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.
- Delivered to Kamioka on 4th Feb. ==== 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. ==== 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. ==== 15pin-9pin changer for coil driver output [Ushiba-san, Ohishi] ==== ==== 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. ==== Attach magnets to dummy mirror (4 ; with the diameter of 2mm and the length of 5mm NdFeB magnets) [Tomaru, Yamamoto] ====
- We used CLIO magnet fixture jigs. ==== Screws in replace with Cu screws [Ohishi] ====
- Replaced all Cu screws to stainless screws. Magnetism problem was indicated.
=== Some parts ====
- ==== Pico-motors and PZTs ==== We have 4 pico-motors except for x-axis (the direction of the light ) y, z, pitch, yaw ==== Coil drivers ==== 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.
=== Stages ====
- Condensation
- Vacuum compatibility?