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← Revision 4 as of 2019-11-01 13:30:19 ⇥
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2019/10/25 14:00 - |
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| [[https://onedrive.live.com/view.aspx?resid=8E8081C20FE5EC3A!2278&ithint=file%2cxlsx&authkey=!AMFNtNa-Y6CVp94|Post-O3 task list]] | [[https://onedrive.live.com/view.aspx?resid=8E8081C20FE5EC3A!2278&ithint=file,xlsx&authkey=!AMFNtNa-Y6CVp94|Post-O3 task list]] |
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| I diagonalized the ASC degrees of freedom of the beam splitter using the oplev as a first approximation (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=11165|11165]]). When the wafefront sensor becomes available we will do it again. * Only low frequencies were considered. Actually I used DC offsets. * After the correction, between angular degrees of freedom we achieved 2% coupling when checking with offsets and there was no coherence with length when briefly checking with transfer functions. * Because the coherence decreased at low frequecies after the correction if we want to further reduce the coupling at low frequencies we need to actuate with a line rather than with white noise. * It's still necessary to measure the whole set of crossed transfer functions. |
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| * As pointed out above, measure crossed transfer function in the BS. * Do the same with SR suspensions beginning with SRM. |
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| === OMMT & OSTM (Takahashi) === ==== Past week report ==== * Assembled the new OSTM suspension using the dummy mirror. At the first time, suspension length was too long by 1cm. It was corrected. |
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| === OMMT & OSTM === ==== Past week report ==== |
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| * Test of the OSTM suspension is planed in the week of 11/4. | |
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| * Takahashi: * Sato: * Hirata: |
* Takahashi: * Sato: * Hirata: |
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| * Fujii: | * Fujii: |
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| * Takahashi: * Sato: * Hirata: |
* Takahashi: 5-7 * Sato: 5-7 * Hirata: |
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| * Fujii: | * Fujii: |
Agenda/Minutes of the VIS Meeting on 2019/10/25
2019/10/25 14:00 -
Participants:
Progress report
Type-A
Past week report
Plan for coming weeks
Type B
Past week report
I diagonalized the ASC degrees of freedom of the beam splitter using the oplev as a first approximation (klog entry 11165). When the wafefront sensor becomes available we will do it again.
- Only low frequencies were considered. Actually I used DC offsets.
- After the correction, between angular degrees of freedom we achieved 2% coupling when checking with offsets and there was no coherence with length when briefly checking with transfer functions.
- Because the coherence decreased at low frequecies after the correction if we want to further reduce the coupling at low frequencies we need to actuate with a line rather than with white noise.
- It's still necessary to measure the whole set of crossed transfer functions.
Plan for coming weeks
- As pointed out above, measure crossed transfer function in the BS.
- Do the same with SR suspensions beginning with SRM.
Type-Bp
Past week report
Plan for coming weeks
OMMT & OSTM (Takahashi)
Past week report
- Assembled the new OSTM suspension using the dummy mirror. At the first time, suspension length was too long by 1cm. It was corrected.
Plan for coming weeks
- Test of the OSTM suspension is planed in the week of 11/4.
VIS electronics
Past week report
Plan for coming weeks
Other site works
Safety
- Incidents:
Discussion
Travel Plans
- Travel (Week of 10/28):
- Takahashi:
- Sato:
- Hirata:
- Shoda:
- Fujii:
- Tanaka:
- Travel (Week of 11/4):
- Takahashi: 5-7
- Sato: 5-7
- Hirata:
- Shoda:
- Fujii:
- Tanaka:
Next meeting
On 2019/11/1(Fri)