Transfer function measurement to DARM

[YoshinoriFujii]

for the check of vibration isolation performance

• [X] measurement with ALS-DARM

  • [X] w/o control
  • [X] w/ control

• [ ] measurement with FPMI-DARM

  • [X] w/o control
  • [ ] w/ control

[YoshinoriFujii]

Note 2019.11.5

noise floor of ALS-DARM and FPMI-DARM

• Blue: ALS-DARM (green)
• Red: FPMI-DARM (IR)

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• Since the IPL started an oscillation at 0.2Hz when the IP loop was opened and this disturbed the FPMI lock acquisition, I used the following filters for this measurement.
  • Blue: implemented one
  • red: dc+damp filter for this measurement
  • green: dc for this measurement

• 確認はしていないけど、LVDTのセンサーノイズに埋もれることは、ないのではなかろうか
  • [x] 要確認

[YoshinoriFujii]

noise budget, rough estimation

• It seemed that:
  • IP-LVDT control noise was not problematic, however,
  • GAS (dc+damping) control looked introduced their sensor noise...
  • This might disturbed the measurement.

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• the sensor noise coupling in the measurement configuration was like the following, with TWR_DAMPED w/o IPL control (or w/ IPL-dc(with-red-colored-filter in the above) )

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• with TWR_DAMPED w/o IPL control (or w/ IPL-dc(with-red-colored-filter in the above) )
• with dc control at F3GAS

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• the sensor noise coupling in the ALIGNED state:

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• the sensor noise coupling in the ALIGNED state with MNps-L/T/Y controls:

• Concerning the Photo sensor calibration, see: https://www.evernote.com/l/AoOxcodbecZM3IaJAeMnAFUNiVrfhBufUqs/

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• [ ] make the TF plot
• [ ] try again the measurement with all the GAS in dc control

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• Other notes about this simulation [1]:
  • scripts are currently in:
  • /kagra/Dropbox/Personal/Fujii/TypeA/simulation/

[1] for the examples:

• example_180722.m
• example_sensornoise.m

[YoshinoriFujii]

2019.11.8 log

see /kagra/Dropbox/Personal/Fujii/TypeA/simulation/figures/*/20191105*/

[YoshinoriFujii]

ちなみに、DARMのspectraに重ねてみた。

https://www.dropbox.com/s/5kxyhctpdmagta8/log_20191107.pdf?dl=0

• 目安を知りたいがためだけにやった。これ以外理由はない。

• 地面振動
• 各sensor noise floor
  • 特にPSのフロアの不定性の幅がある程度大きい。加えて、loop-gainはETMY用に合わせていない。
• 各他自由度coupling(今回の計算は、ほぼ理想的な状態。[1])

が実際のものとは異なるので、重なってない。が、PSのsensor noise couplingが効いていそう。

• より細かく、実際のセンサノイズを使ったらうまく重なるかな、という気はする。
• Photo-Sensor loops は切ってみたい気がする。

[1] 詳しくは、slx見て。 TMVtoTML-coupling ratio: 1e-2 TMPtoTML-coupling ratio: 1e-3 このほか上の段の特殊なcouplingはないものとしている。

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• [ ] この件は、別のissueを立てるとする。

[YoshinoriFujii]

Measurement summary on 2019.11.12

• information of the dir in /users/VIS/TypeA/general/toDARM/{date}/

date	Notes	Are exc/disp_TF data extracted?	Are exc/disp_TF plotted w/ simulation?
20191917	white noise injection to DARM
20191019	some spectra for sanity check
20191025	ETMX_IPLexc to ALS_DARM w/ ALIGNED
20191027	ETMX_IP/BFLexc to ALS_DARM w/ ALIGNED
20191028	ETMX_IPLexc to ALS_DARM w/ TWR_DAMPED w/o L controls
20191030	ETMX_IP/BFLexc to ALS_DARM w/ TWR_DAMPED w/o L controls
20191031	ETMX_IP/BFLexc to ALS_DARM w/ TWR_DAMPED w/o L controls
20191104	ETMX_IP/BFLexc to FPMI w/ TWR_DAMPED w/o L controls
20191104	a template fr ETMX_Payload_exc to FPMI w/ TWR_DAMPED w/o L controls

[YoshinoriFujii]

Status (2019.11.12)

From	To	Configuration	Are exc/disp_TF data extracted?	Are exc/disp_TF plotted w/ simulation?
IPLexc	ALS_DARM	w/o controls	---	----
IPLexc	ALS_DARM	w/ controls	yes, done	----
IPLexc	ALS_DARM	w/o controls	---	----
IPLexc	ALS_DARM	w/ controls	yes, done	----
IPLdisp	FPMI	w/o controls	---	----
IPLdisp	FPMI	w/ controls	NOT MEASURED	----
IPLdisp	FPMI	w/o controls	---	----
IPLdisp	FPMI	w/ controls	NOT MEASURED	----
BFLexc	ALS_DARM	w/o controls	---	----
BFLexc	ALS_DARM	w/ controls	yes, done	----
BFLexc	ALS_DARM	w/o controls	---	----
BFLexc	ALS_DARM	w/ controls	yes, done	----
BFLdisp	FPMI	w/o controls	---	----
BFLdisp	FPMI	w/ controls	NOT MEASURED	----
BFLdisp	FPMI	w/o controls	---	----
BFLdisp	FPMI	w/ controls	NOT MEASURED	----

Notes:

• w/ and w/o controls shows if the controls of the payload and L-dof are ON and OFF respectively.
• see https://docs.google.com/spreadsheets/d/1s1zu5Fh3ZYAqnfRzqsB0JxG-N94sPw9D9QgmPNT6abU/edit#gid=0
• see also /users/TypeA/ITMX/TF/TOP_Meas/ETMX/SENSCORR/SEISM_TF_1.xml

[YoshinoriFujii]

other reference: https://www.evernote.com/l/AoN8rijuq3FNiq7-q7ryFe1Zm8nmxV9DI_w/

[YoshinoriFujii]

Note on 2019.11.14

• dir of data to be extracted

dir_ETMX=/users/VISsvn/TypeAtower/ETMX/Measurements

dir	Contents	Note
${dir_ETMX}/20190926	GAsexc w/ controls	for a test of F1 filter (*)
${dir_ETMX}/20190929	IP_LTYexc w/o controls
${dir_ETMX}/20190930	F0GASexc w/o controls
${dir_ETMX}/20191003	F1/F2/F3/BFGASexc w/o controls
${dir_ETMX}/20191004	BF_LTYexc w/o controls
	IP_Lexc comp	comp of seisSC
${dir_ETMX}/20191006	F0GASexc w controls	w/ ALIGNED

• about the passive transfer function from ground to IPL
  • w/ controls: see https://github.com/YoshinoriFujii/Weekly-task/issues/23
  • w/o controls: see https://www.evernote.com/l/AoNoXh2mBxFKhLj12cvQnVdsnexJFkcetfg/ also https://www.evernote.com/l/AoM7L-o1lolNqb8LFOe6FbxZn-aidb9HsUg/

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(*1) How about update the GAs controls like: => at F1: modify into dcdamp => at F3: modify into dc

[YoshinoriFujii]

というか、GEO_IPLとDARMの伝達関数も見たいよね。見てよ。