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== Type-C suspensions == == Type-C (TAMA) suspension ==

 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.
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 5 TAMA-type suspensions were used for iKAGRA.<<BR>>
 3 PO type; MC_i, MC_e, MC_o and 2 TM or RM type; ETMX, ETMY.
  
 Work log related to 2TM is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|iKAGRA_ETM]]
 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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 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 used at the X/Y ends, will be used as 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 ===
 
 [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions]]

=== References ===
 *OSEM
 *[[KAGRA/Subgroups/VIS/Type-C/Drawings|Drawings]]
 *Magnet and standoff fixture jig
 *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Documents]]
 *[[KAGRA/Subgroups/VIS/Type-C/IMC_Suspension|IMC_suspension]]

Type-C (TAMA) suspension

  • 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.

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

Toward bKAGRA

bKAGRA

References

KAGRA/Subgroups/VIS/Type-C (last edited 2020-04-30 12:05:11 by KousekiMiyo)