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takahiro.miyamoto - 19:02 Friday 24 August 2018 (5899) Print this report
ETMX suspension damping work

[Fujii, Miyamoto]

we succeeded the ETMX dumping of the TM pit and yaw motion.

We achieved the requirement by the commissioners ( < 880 nrad in RMS )
The best RMS today when all the control was closed were:

400 nrad in Yaw DoF (RMS)
600 nrad in Pitch DoF (RMS)


However this time we focused the damping of TM yaw motion.
Before damping TM oplev Power spectrum : Fig.1
After damping TM oplev Power spectrum : Fig.2

And we upload the damping filter information due to the log.
- MN stage Fig.3, Fig.4

- BF stage Fig.5, Fig.6, Fig.7, Fig.8, Fig.9, Fig.10
About BF Long and Trans, don't need [-1]gain for damping.

- IP stage Fig.11, Fig.12, Fig.13, Fig.14, Fig.15, Fig.16

And about Gain, after we wait and see the behaviour of the suspension at this condition during one day, we set these value.

Images attached to this report
Comments to this report:
yutaro.enomoto - 8:53 Saturday 25 August 2018 (5900) Print this report

Great to hear that!
Omedetou Gozaimasu!!!

kiwamu.izumi - 11:30 Saturday 25 August 2018 (5902) Print this report

Very cool. You got it!

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yoshinori.fujii - 10:17 Sunday 26 August 2018 (5904) Print this report

I've attached the notes about the installed damping system here. If you find anything wrong, strange,would you please correct me, Miyamoto-san?
This damping system is just one example which achieved the requirement, we can modify better later if we want.

takahiro.miyamoto - 14:25 Sunday 26 August 2018 (5906) Print this report

Yesterday, I added the TM oplev damping.
This result is Fig.1. ( Pit : ~100nrad [RMS] ,  Yaw : ~200nrad[RMS] )
TM-Oplev signal are uppper side graphs. Left one is Yaw motion, and right one is Pit motion.
Black line is yestrday morning result (not including the TM dampign filter).

Then I confirmed that all feed back loop was working.
Therefore I fixed the gain value, and I included these gain to filter bank.
I uploaded the these filter bank condition.
I don't change the damping filter about IP and BF, so I upload the damping filter of MN stage and TM satage.
 

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yutaro.enomoto - 19:28 Tuesday 19 March 2019 (8454) Print this report

== Digging up useful information from Kashiwa: L motion of EMTX ==

[T Yamamoto, Enomoto]
Thanks to Yamamoto-san, 900 sec data when Miyamoto-san took damped spectra of the oplev outputs of ETMX during his payload control test is now back to NDS, so we can have an access to it through diaggui or dataviewer (from GPS 1219295154).
Today I looked at the spectrum of length sensing oplev, which should monitor the motion of the test mass in L direction.
This is the result. Looking back the calibration factor for the LS oplev, each segment of the QPD, and klog entries by Miyamoto-san, the output seems to be calibrated to be um and still valid at that time.
RMS in L was 0.5 um, if we believe this result.

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