Differences between revisions 126 and 141 (spanning 15 versions)
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Deletions are marked like this. Additions are marked like this.
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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 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.

 *[[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.		  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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=== 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]]  *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]]
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=== References === === Drawings ===
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 *Drawings
 *		  *[[KAGRA/Subgroups/VIS/Type-C/Drawings|Drawings]]
 *Magnet and standoff fixture jig
 *[[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.

  • Note by K. Arai(2014)

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

Drawings

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