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| == Type-C (TAMA) suspension == | = Type-C (TAMA) suspension = |
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| Type-C suspension is relatively small double pendulum suspension 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. | 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. So type-C suspension is sometimes called as TAMA-type suspension. |
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| === iKAGRA === | Type-C can be roughly divided into 2 types. One is PO (Pick-off) type which suspends the mirror with the thickness of about '''3cm'''.<<BR>> The other is TM(test mass) type which suspends the mirror with the thickness of about '''6cm'''. |
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| 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. |
== 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. For these mirrors PO(Pick-off) type suspension are used. 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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| === bKAGRA === | == bKAGRA == |
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| [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/iKAGRAbKAGRA|Memo by Yamamoto-san]] | [[KAGRA/Subgroups/VIS/iKAGRAbKAGRA|Memo by Yamamoto-san]] |
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| *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]] | *[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]] |
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| *OSEM | *[[KAGRA/Subgroups/VIS/Type-C/OSEM|OSEM]] |
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| *[[KAGRA/Subgroups/VIS/Type-C/IMC_Suspension|IMC_suspension]] | *[[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. One is PO (Pick-off) type which suspends the mirror with the thickness of about 3cm.
The other is TM(test mass) type which suspends the mirror with the thickness of about 6cm.
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. For these mirrors PO(Pick-off) type suspension are used.
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