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| == iKAGRA ETM suspension preparation log == | == Type-C (TAMA) suspension == |
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| === 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 === 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. 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. === 4. New parts preparation === ==== 4.1 Coil bobbin ==== [Takahashi-san, Tatsumi-san] (Delivered to Kamioka on 4th Feb.) [[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. ==== 4.2 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. ==== 4.3 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 phi3.1 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. === 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] |
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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| === 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 ==== |
=== iKAGRA === |
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| ==== 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. |
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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| ==== 6.6 Stages ==== * Condensation * Vacuum compatibility? === 7. Assembling === [Tomaru-san, Ohishi, Yamamoto-san] <<BR>> On 21th, suspension frame, security frame, xy stages completed |
Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|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. [[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 === |
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| === 8. Hanging === [Yamamoto-san, Uchiyama-san, Doi-san, and Ohishi] <<BR>> Hanging jig preparation |
[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions]] |
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| === 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 [] () === |
=== References === *OSEM *[[KAGRA/Subgroups/VIS/Type-C/Drawings|Drawings]] *Magnet and standoff fixture jig |
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