== 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<<BR>>
 Suspensions and mirrors were installed on 17th Feb so this 6 weeks task was completed on schedule.
  
=== 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. <<BR>>
 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.<<BR>>
 Takahashi-san ordered similar screws.
=== 4. New parts preparation ===
==== 4.1 Coil bobbin (Delivered to Kamioka on 4th Feb.) ====
[Takahashi-san, Tatsumi-san] 
  [[http://gwdoc.icrr.u-tokyo.ac.jp/DocDB/0047/T1604741/001/Coil_Preparation_2016.pdf|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. 
 * 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|{{attachment:D-sub_connector_plate.pdf||width=600}}]]<<BR>>
 * 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. 
==== 4.6 D-sub 9pin - BNC changer [Doi-san] ====
 * Used to input the signal from the laser displacement measurement system to AA/ADC of the digital system.  
=== 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] ====
  [[attachment:MirrorContainer.pdf|{{attachment:MirrorContainer.pdf||width=600}}]]<<BR>>
 * 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] <<BR>>
 On 21th, suspension frame, security frame, xy stages completed
 
=== 8. Hanging ===
[Yamamoto-san, Uchiyama-san, Doi-san, and Ohishi] <<BR>>
 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 ====