3004
Comment:
|
980
|
Deletions are marked like this. | Additions are marked like this. |
Line 1: | Line 1: |
== iKAGRA ETM suspension preparation log == | == Type-C suspension == |
Line 3: | Line 3: |
==== 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 |
Type-C suspension is a relatively small double pendulum with intermediate mass passively damped with eddy current damping. Among the big suspensions used in KAGRA, type-C is the smallest one. Some of the type-C were once used for TAMA300, originally designed by K. Arai in 1990s. So type-C suspension is sometimes called as TAMA-type suspension. === iKAGRA === Five TAMA-type suspensions were used for iKAGRA.<<BR>> In the final iKAGRA configuration, 6 mirrors are suspended and 5 of them are Type-C. Three are PickOff type; MC_i, MC_e, MC_o and 2 TM(TestMass) or RM type; ETMX, ETMY. |
Line 9: | Line 11: |
==== 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, 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. * Delivered to Kamioka on 4th Feb. * Coil winding [Kuwahara-san, and Ushiba-san from U-Tokyo, and Lee-san from Okazaki] * 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] [[attachment:D-sub_connector_plate.pdf|{{attachment:D-sub_connector_plate.pdf||width=600}}]]<<BR>> * M3 holes were changed to phi3.2 holes. We used drilling machine at Kamioka surface office. * Mirror container [Tatsumi-san] [[attachment:MirrorContainer.pdf|{{attachment:MirrorContainer.pdf||width=600}}]]<<BR>> * Magnets for dummy mirror (4 ; 2-phi-L-5mm Nd magnets) [Tomaru, Yamamoto] |
Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. |
Line 35: | Line 13: |
* 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 ==== |
=== Toward bKAGRA === |
Line 44: | Line 15: |
==== Assembling [Tomaru-san, Ohishi, Yamamoto-san] ==== On 21th, suspension frame, security frame, xy stages completed |
[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/iKAGRAbKAGRA|Memo by Yamamoto-san]] === bKAGRA === |
Line 47: | Line 19: |
==== 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? ==== Installation ==== |
[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions]] |
Type-C suspension
- Type-C suspension is a relatively small double pendulum with intermediate mass passively damped with eddy current damping. Among the big suspensions used in KAGRA, type-C is the smallest one. Some of the type-C were once used for TAMA300, originally designed by K. Arai in 1990s. So type-C suspension is sometimes called as TAMA-type suspension.
iKAGRA
Five TAMA-type suspensions were used for iKAGRA.
In the final iKAGRA configuration, 6 mirrors are suspended and 5 of them are Type-C. Three are PickOff type; MC_i, MC_e, MC_o and 2 TM(TestMass) or RM type; ETMX, ETMY.Work log about 2 iKAGRA ETMs is here.
Toward bKAGRA