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← Revision 172 as of 2020-04-30 12:05:11 ⇥
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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]<<BR>> * 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. ==== 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]<<BR>> [[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]<<BR>> * 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 by eddy current damping. <<BR>> Some of the type-C suspensions which are used in KAGRA were once used for TAMA300, originally designed by K. Arai in 1990s. <<BR>> 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. |
Type-C can be roughly divided into '''2''' types.<<BR>> '''PO''' (Pick-off) type suspends the mirror with the thickness of about '''3cm'''.<<BR>> '''TM''' (test mass) type suspends the mirror with the thickness of about '''6cm'''.<<BR>> Main differences are in the intermediate mass and frame design. == 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. === Mode Cleaner suspensions === The thickness of the mode cleaner mirrors are about 3cm.<<BR>> (In TAMA, thickness of the MCe mirror was about 6cm; it means that its suspension was TM type. )<<BR>> So the suspensions for the MC mirrors are PO-type.<<BR>> Following the suggestion by K. Arai,<<BR>> *[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]]<<BR>> main frames have been redesigned by H. Ishizaki. Mode cleaner suspensions will be used for long term even after the iKAGRA.<<BR>> Nakano-san installed MC_i, MC_e, and MC_o. The thickness of the MC mirrors are about 3cm. This type of the is called as PO(pick-off). === Temporarily used suspensions === As ETMX and ETMY, TM type mirrors were used. Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter. <<Navigation(children)>> == 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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| ==== 6.6 Stages ==== * Condensation * Vacuum compatibility? === 7. Assembling === [Tomaru-san, Ohishi, Yamamoto-san] <<BR>> On 21th, suspension frame, security frame, xy stages completed |
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| === 8. Hanging === [Yamamoto-san, Uchiyama-san, Doi-san, and Ohishi] <<BR>> Hanging jig preparation === 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 [] () === |
=== 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 relatively small double pendulum with intermediate mass passively damped by eddy current damping.
Some of the type-C suspensions which are used in KAGRA were once used for TAMA300, originally designed by K. Arai in 1990s.
So type-C suspension is sometimes called as TAMA-type suspension.
Type-C can be roughly divided into 2 types.
PO (Pick-off) type suspends the mirror with the thickness of about 3cm.
TM (test mass) type suspends the mirror with the thickness of about 6cm.
Main differences are in the intermediate mass and frame design.
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.
Mode Cleaner suspensions
The thickness of the mode cleaner mirrors are about 3cm.
(In TAMA, thickness of the MCe mirror was about 6cm; it means that its suspension was TM type. )
So the suspensions for the MC mirrors are PO-type.
Following the suggestion by K. Arai,
*Design change for new suspensions(by K. Arai)
main frames have been redesigned by H. Ishizaki.
Mode cleaner suspensions will be used for long term even after the iKAGRA.
Nakano-san installed MC_i, MC_e, and MC_o. The thickness of the MC mirrors are about 3cm. This type of the is called as PO(pick-off).
Temporarily used suspensions
As ETMX and ETMY, TM type mirrors were used. Work log about 2 iKAGRA ETMs is here. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter.
| /Design2016 /Drawings /Drawings/Comment /IMC_Suspension /IMMT /OSEM /iKAGRA_ETM |
bKAGRA
- Two suspensions used at the X/Y ends, are used as IMMT1 and IMMT2 for bKAGRA.
Drawings
- Magnet and standoff fixture jig