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| == Type-C (TAMA) suspension == | = Type-C (TAMA) suspension = |
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| 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. | 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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| === iKAGRA === | *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Note by K. Arai(2014)]] |
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| Five TAMA-type suspensions were used 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 6cm. Other one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter. |
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. So the suspensions for the MC mirrors are PO-type. 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). === Temporary mirrors === 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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| Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. | Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. |
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| === Toward bKAGRA === | * ETM Transfer function * long term drift |
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| *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]] |
== 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]] |
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| *[[KAGRA/Subgroups/VIS/Type-C/IMC|IMC Modification]] === bKAGRA === |
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| [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions]] | *[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]] |
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| === References === *OSEM *Drawings * |
=== 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. So the suspensions for the MC mirrors are PO-type.
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).
Temporary mirrors
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