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| == iKAGRA ETM suspension Preparation; Current status == | == Type-C (TAMA) suspension == |
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| ==== Schedule ==== 12th- (2 weeks) Disassembling and Washing (favorable) 25th- (2 weeks) Assembling and Hanging 1th Feb- coil winding, transportation to the End, installation test 7th Feb- check 15th installation ==== Disassembling at Mitaka[Ohishi] ==== finished. (12th-19th) [problem] * 2 nuts stuck: solved by Hirata-san * A Cu screw stuck: solved by Hirata-san ==== Washing [Hirata-san] ==== most of the parts were washed. [problem] * ultra sonic washer broken 20th ordered on 22th(Fri) will be arrive at Mitaka on 26th(Tue) * 8 screws for adjusting the IM holding plate was dirty Solution: order new screws (not ordered yet) ==== Missing parts ==== * coil bobbin [Takahashi-san] * coil winding [students of Ando-lab] * D-sub fixture plates [Takahashi-san] * mirror container [Tatsumi-san] * magnets for dummy mirror (4 ; 2-phi-L-5mm Nd magnets) [Ohishi] * some screws in replace with Cu screws [Ohishi] ==== pico-motors and PZTs ==== |
Type-C suspension is a relatively small double pendulum 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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| ==== coil driver ==== | === iKAGRA === |
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| ==== cables ==== | In 2017, 5 Type-C suspensions are installed 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 about 6cm. Other 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 [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. |
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| ==== Assembling ==== On 21th, suspension frame, security frame, xy stages completed [Tomaru] |
* ETM Transfer function * long term drift === Toward bKAGRA === *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]] *[[KAGRA/Subgroups/VIS/Type-C/IMMT|IMMT Preparation]] *[[KAGRA/Subgroups/VIS/Type-C/IMC|IMC Modification]] === bKAGRA === |
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| ==== Hanging ==== |
[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions]] |
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| ==== Transfer Function Measurement ==== | === 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 a relatively small double pendulum 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 are installed in iKAGRA.
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 about 6cm. Other 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
- Two suspensions that were used as at the X/Y end, will be used at IMMT for bKAGRA.
bKAGRA
References
- OSEM
- Magnet and standoff fixture jig