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← Revision 172 as of 2020-04-30 12:05:11 ⇥
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| == iKAGRA ETM suspension Preparation; Current status == | = Type-C (TAMA) suspension = |
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| ==== Schedule ==== * 12th Jan- (2 weeks) Disassembling and Washing (favorable) * 25th Jan - (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. <<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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| ==== coil driver ==== | *[[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/IMC%20Suspension|Note by K. Arai(2014)]] |
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| ==== cables ==== | 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. |
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| ==== Assembling ==== On 21th, suspension frame, security frame, xy stages completed [Tomaru] |
== 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.<<BR>> (In TAMA, thickness of the MCe mirror was about 6cm; it means that its suspension was TM type. )<<BR>> So the suspensions for the MC mirrors are PO-type.<<BR>> Following the suggestion by K. Arai,<<BR>> *[[KAGRA/Subgroups/VIS/Type-C/Design2016|Design change for new suspensions(by K. Arai)]]<<BR>> main frames have been redesigned by H. Ishizaki. Mode cleaner suspensions will be used for long term even after the iKAGRA.<<BR>> 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). === Temporarily used suspensions === As ETMX and ETMY, TM type mirrors were used. Work log about 2 iKAGRA ETMs is [[KAGRA/Subgroups/VIS/Type-C/iKAGRA_ETM|here]]. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter. <<Navigation(children)>> == 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]] *[[KAGRA/Subgroups/VIS/Type-C/IMMT|IMMT Preparation]] |
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| ==== Hanging ==== | |
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==== Transfer Function Measurement ==== |
=== 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.
(In TAMA, thickness of the MCe mirror was about 6cm; it means that its suspension was TM type. )
So the suspensions for the MC mirrors are PO-type.
Following the suggestion by K. Arai,
*Design change for new suspensions(by K. Arai)
main frames have been redesigned by H. Ishizaki.
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).
Temporarily used suspensions
As ETMX and ETMY, TM type mirrors were used. Work log about 2 iKAGRA ETMs is here. The last one is coming from CLIO, the size of the BS mirror was 4cm in thickness and 15cm in diameter.
| /Design2016 /Drawings /Drawings/Comment /IMC_Suspension /IMMT /OSEM /iKAGRA_ETM |
bKAGRA
- Two suspensions used at the X/Y ends, are used as IMMT1 and IMMT2 for bKAGRA.
Drawings
- Magnet and standoff fixture jig