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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. [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 ==== |
Type-C suspension is a relatively small double pendulum with intermediate mass passively damped with eddy current damping. Among the large 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. |
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| ==== Assembling [Tomaru, Ohishi, Yamamoto] ==== On 21th, suspension frame, security frame, xy stages completed |
=== iKAGRA === In 2017, 5 Type-C suspensions are installed in iKAGRA.<<BR>> In the final iKAGRA configuration, 7 mirrors are suspended and 6 of them are Type-C. Three are PO(pick-off) type; MC_i, MC_e, MC_o with the mirror thickness with about 3cm, and 2 are TM(test mass) or RM type; ETMX, ETMY with the mirror thickness of about 6cm. Other 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 ==== | === Toward bKAGRA === |
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| ==== Installation ==== | *Two suspensions that were used as at the X/Y end, will be used at IMMT for bKAGRA. [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/iKAGRAbKAGRA|Memo by Yamamoto-san]] *[[KAGRA/Subgroups/VIS/Type-C/IMMT|IMMT Preparation]] *[[KAGRA/Subgroups/VIS/Type-C/IMC|IMC Modification]] === bKAGRA === [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions]] === References === *OSEM *[[KAGRA/Subgroups/VIS/Type-C/Drawings|Drawings]] *Magnet and standoff fixture jig *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Documents]] *[[KAGRA/Subgroups/VIS/Type-C/IMC_Suspension|IMC_suspension]] |
Type-C (TAMA) suspension
- Type-C suspension is a relatively small double pendulum with intermediate mass passively damped with eddy current damping. Among the large 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
In 2017, 5 Type-C suspensions are installed in iKAGRA.
In the final iKAGRA configuration, 7 mirrors are suspended and 6 of them are Type-C. Three are PO(pick-off) type; MC_i, MC_e, MC_o with the mirror thickness with about 3cm, and 2 are TM(test mass) or RM type; ETMX, ETMY with the mirror thickness of about 6cm. Other 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
Toward bKAGRA
- Two suspensions that were used as at the X/Y end, will be used at IMMT for bKAGRA.
bKAGRA
References
- OSEM
- Magnet and standoff fixture jig