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| == iKAGRA ETM suspension preparation log == | == Type-C (TAMA) suspension == |
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| ==== original schedule ==== * 12th Jan- (2 weeks) Disassembling, Washing, and transportation * 25th Jan - (2 weeks) Assembling and Test Hanging with 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 Mitaka [Ohishi] ==== status: finished. (12th-19th) [problem] * 2 nuts stuck: solved by Hirata-san * A Cu screw stuck: solved by Hirata-san ==== Washing and transportation to Kamioka [Hirata-san] ==== status: finished. [problem] * ultra sonic washer broken 20th ordered on 22th(Fri) will be arrive at Mitaka on 26th(Tue) * 8 screws for adjusting the IM holding plate was dirty Solution: order new screws (by Takahashi-san) ==== New parts ==== status: finished. * coil bobbin [Takahashi-san] * coil winding [students of Ando-lab] [problem] coil wires from the bobbin to Dsub connector were too short(20cm). The length of 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. |
Type-C suspension is a small double pendulum with intermediate mass passively damped by eddy current damping. Some of the type-C suspensions were once used for TAMA300, originally designed by K. Arai in 1990s. So type-C suspension is sometimes called as TAMA-type suspension. |
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| [problem ]Peeling off the coating of wires longer than the length of those pins make the wire broken easily. * D-sub fixture plates [Takahashi-san] [problem] M3 holes were drilled to phi3.2 holes. * mirror container [Tatsumi-san] [problem] * magnets for dummy mirror (4 ; 2-phi-L-5mm Nd magnets) [Tomaru, Yamamoto] [] * some 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 ==== |
*[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Note by K. Arai(2014)]] |
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| ==== Assembling [Tomaru, Ohishi, Yamamoto] ==== On 21th, suspension frame, security frame, xy stages completed |
=== iKAGRA === In 2017, 5 Type-C suspensions were installed in iKAGRA.<<BR>> In the final iKAGRA configuration, 7 mirrors were suspended and 6 of them were Type-C. Three were PO(pick-off) type; MC_i, MC_e, MC_o with the mirror thickness of about 3cm, and the others were TM(test mass) or RM type; ETMX, ETMY with the mirror thickness of about 6cm. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter. |
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| ==== Hanging ==== Hanging jig preparation |
Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. |
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| ==== Transfer Function Measurement ==== | * ETM Transfer function * long term drift |
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| ==== Transportation to the End ==== | === bKAGRA === |
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| ==== Installation ==== | *Two suspensions used at the X/Y ends, are used as IMMT1 and IMMT2 for bKAGRA. [[KAGRA/Subgroups/VIS/iKAGRAbKAGRA|Memo by Yamamoto-san]] *[[KAGRA/Subgroups/VIS/Type-C/IMMT|IMMT Preparation]] *[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]] === Drawings === *[[KAGRA/Subgroups/VIS/Type-C/OSEM|OSEM]] *[[KAGRA/Subgroups/VIS/Type-C/Drawings|Drawings]] *Magnet and standoff fixture jig *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|IMC_suspension]] |
Type-C (TAMA) suspension
- Type-C suspension is a small double pendulum with intermediate mass passively damped by eddy current damping. Some of the type-C suspensions were once used for TAMA300, originally designed by K. Arai in 1990s. So type-C suspension is sometimes called as TAMA-type suspension.
iKAGRA
In 2017, 5 Type-C suspensions were installed in iKAGRA.
In the final iKAGRA configuration, 7 mirrors were suspended and 6 of them were Type-C. Three were PO(pick-off) type; MC_i, MC_e, MC_o with the mirror thickness of about 3cm, and the others were TM(test mass) or RM type; ETMX, ETMY with the mirror thickness of about 6cm. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter.Work log about 2 iKAGRA ETMs is here.
- ETM Transfer function
- long term drift
bKAGRA
- Two suspensions used at the X/Y ends, are used as IMMT1 and IMMT2 for bKAGRA.
Drawings
- Magnet and standoff fixture jig