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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. <<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. === 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 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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| === 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 ==== |
*[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Note by K. Arai(2014)]] |
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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. |
=== 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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| ==== 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 === bKAGRA === *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]] |
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| === 8. Hanging === [Yamamoto-san, Uchiyama-san, Doi-san, and Ohishi] <<BR>> Hanging jig preparation |
*[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]] |
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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 [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 ==== |
=== 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