µseismic upconversion
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- Heather Little
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1 Upconversion WG New subgroup of DetChar Tasked with identifying and reducing non-linear noise coupling Began meeting in May 006 Meets :30 PST every second Monday immediately following the commissioning telecon Lots of overlap with other groups
2 µseismic upconversion 60 days min. trend by Brian O. LVEA_STS_X_0p!0p 3 x! SenseMon Range (Mpc) 3 x!6 Jan. 4 LLO ilog LVEA_STS_X_0p!0p SenseMon Range (Mpc)
3 H0:DMT!BRMS!PEM!EX!SEISX!0.3!Hz! = µseismic upconversion H0:DMT-BRMS-PEM-EX-SEISX--3 H0:DMT!BRMS!PEM!EX!SEISX!!3Hz! = 0.3Hz 0 days min trend Similar for H & L LHO ilog May H0:DMT!BRMS!PEM!EX!SEISX!3!Hz! = 0.9Hz H0:DMT-BRMS-PEM-EX-SEISX H:DMT!DTQL!LSC!AS!Q!BAND!68!83 H:DMT-DTQL-LSC-AS-Q-BAND-68-83!4 x Time [days] 30 Time [Days]
![7!80 Hz DARM power -d coherence X end Seismic 0 Time [hrs] 0 30 0 30 0!](/docs-images/90/104314192/images/4-0.jpg "Mean subtracted signal [db] 3 3 40 40!0 4 4!30 4 0.. Cts cts /Hz /Hz x!")
4 7!80 Hz DARM power -d coherence X end Seismic 0 Time [hrs] ! Mean subtracted signal [db] !0 4 4! Cts cts /Hz /Hz x! 0 Frequency [Hz]
5 seismic Good vs. Bad! 6: pm Aug. 9!! 3.9 Mpc :4 pm Aug. 9!!.7 Mpc Noise Excess 64 Avgs, 0. Hz BW N~ F -7/ 40-0 Hz DARM_ERR [m/rthz]!6!7!8!9!0 Frequency [Hz]
6 Mechanisms Many have been proposed, few have been definitively ruled out Barkhausen noise Charge motion Optical scattering Stick-slip suspension noise (eg. clamp) Other actuation noise Electronics noise 6
7 !6 Optical!7 Scattering Scattered Light Noise (" = e!7) ETMX ETMY ITMX ITMY DARM 7 Use OSEM signals to determine optic-los cage motion Huge, efficient scatterers Orders of magnitude too low Many small scatterers? Phase Noise [radians/!hz]!8!9!!!!3 0 3 Frequency [Hz]
8 Seismic upconversion for. Hz floor shaking: April PEM injections 8 RMS in high f band as a function of RMS in low f band RMSS at LHO H & H see same U.C. 8 H or H DARM RMS in 6! Hz band (x ^!8 meters) H* DARM RMS in 6- Hz [m x -8 ] EX EY MX MY H or H DARM 0.3! 4 Hz band (x ^!8 meters) H* DARM RMS in Hz [m x -8 ]
9 not Optic Motion Mid-Y ground injections: Black: none, Red: 0.7 Hz, Blue:. Hz ) / -6 H:LSC-DARM_ERR(REF0) H:LSC-DARM_ERR(REF9) H:LSC-DARM_ERR /0/06 LHO elog ground injection + no ETM damping -> x MC_F increase w/ no UC Magnitude (m/hz Frequency (Hz) *T0=03//00 Same color scheme 3:00: *Avg= *BW=0.0 ) / -7 H:LSC-DARM_ERR(REF0) H:LSC-DARM_ERR(REF9) H:LSC-DARM_ERR increase of DARM RMS!= UC Magnitude (m/hz Frequency (Hz) *T0=03//00 3:00: *Avg=/Bin= *BW=0.0
10 -7 H:LSC-DARM_ERR(REF7) H:LSC-DARM_ERR(REF7) Frequency dependence ) / Magnitude (m/hz -8 H:LSC-DARM_ERR(REF) H:LSC-DARM_ERR(REF3) H:LSC-DARM_ERR(REF6) RMSS injection to LSC-ETMX_EXC Approx. match upconversion Seems linear in acceleration ) / /Hz Magnitude (m/s H:LSC-DARM_ERR(REF7) H:LSC-DARM_ERR(REF) H:LSC-DARM_ERR(REF3) H:LSC-DARM_ERR(REF6) Frequency (Hz)
11 Electronic UC Drive output w/ simulated signal Notch drive in bucket Measure analog coil driver output in situ Largest - 7 Hz (may) show UC cts/rthz V rms /rthz 3 Input digital excitation SJW in LHO ilog April 7, 06 0 Measured analog signal Normal Spectra 7 Hz exc.. 7 Hz exc.. Hz exc. 3 Frequency
12 Direct injection In situ single tone Hz Observed both distortion and broad band noise Not seen in the electronics shop Further testing in progress daq output of coil driver divided by transfer function of hp filter input to coil driver: 0mv p-p Hz at D/A Rai in LLO ilog July 6, 06
13 LLO seismic reprised x 6 LVEA_STST_X_0p!0pHz 4 30 days before ITMY 30 days after ITMY x 6 4 LVEA_STST_X_0p!0p3Hz Before/ After ITMY change Unequiv. seismic Increase in correlation Two corr slopes after LLO Sensmon Range [Mpc] x LVEA_STST_X_0p3!Hz LLO Sensmon Range [Mpc] x LVEA_STST_X_!3Hz LLO Sensmon Range [Mpc] LLO Sensmon Range [Mpc]
14 State of the Upconversion Violin-mode Q measurements consistent w/ low wire loss and low thermal noise but not all wires tested and clamp stick/slip may be an issue in the future Optic motion alone insufficient to increase noise from free swinging CARM measurement Optical scattering probably not the dominant up-conversion mechanism Low F up-conversion caused by actuation force unrelated to suspension stack Actuation chain electronics are the probable cause for Low F upconversion - easily fixable Retraction of the earth quake stops from LLO ITMY greatly reduced baseline noise - could be applied to all IFOs 4 HVAC up-conversion noise effect still unexplained
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