ligo-g050217-00-z1 s4 environmental disturbances robert schofield, u of o john worden, richard...
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LIGO-G050217-00-Z 1
S4 Environmental DisturbancesRobert Schofield, U of O
John Worden, Richard McCarthy, Doug Cook, Hugh Radkins, LHO
Josh Dalrymple, SU
I. Pre-S4 “fixes”
II. Some S4 veto issues
III. Early coupling results from S4 PEM injections
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LIGO-G050217-00-Z 2
In E12, H2 AS_Q was dominated by FMY roll mode when excited by chiller
FMY roll mode peak in AS_Q increases when chiller matches frequency
drifting chiller seismic peak
? staging building chiller
Solution: resonant gain at FMY roll mode, seismic isolation of chiller.D.Q. flag for 10-100 Hz glitches produced by 16 Hz?
Office building chiller
LVEA
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LIGO-G050217-00-Z 3
10 Hz seismometer (etc.) peaks from RF card reader
original set up
after improving ground isolation of RF reader
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LIGO-G050217-00-Z 4
Transformers near test-masses contribute to 60 Hz AS_Q peak
AS_Q peak produced by transformer-sized magnetic field
Recommendation: keep transformers at least 15 feet away from chambers (annulus ion pumps?).
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LIGO-G050217-00-Z 5
Protecting sensitivity to the crab pulsarCrab GW frequency
Pump shut down
Pump left on
Coherence between LVEA seismic and H1, H2 AS_Q
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LIGO-G050217-00-Z 6
Up-conversion of low frequency seismic noise
seismic noise from distant excavation
night spectrum
excites stack modes in AS_Q
up-conversion reduces interferometer sensitivity
night spectrum
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LIGO-G050217-00-Z 7
Up-conversion experiments
Mechanical shaker at EX produces up-conversion in AS_Q
But matched injection into DARM and optical lever servo (pitch and yaw) does not produce up-conversion. This suggests that up-conversion is not produced in servo systems or by optic motion.
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LIGO-G050217-00-Z 8
Up-conversion of low frequency seismic transients
Produces large in-band event (and event triggers) coincident on both interferometers.
Small fast-traveling seismic transient
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LIGO-G050217-00-Z 9
time series of same transient, 0.7 to 2 Hz steep band-pass, seismometers at all stations
H2 AS_Q, 0.7 to 2 band-pass
H2 AS_Q, 70 to 200 Hz band-pass
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LIGO-G050217-00-Z 10
Coincident 1-3 Hz seismic, and 100-200 Hz AS_Q spikes
MY Seis Z 1-3 HzMZ Seis Z 1-3 HzH1 AS_Q 100-200 HzH2 AS_Q 100-200 Hz
This event does not produce up-conversion. However, this event does not show up in a sharper 0.7 to 2 Hz band.
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LIGO-G050217-00-Z 11
Why are airplanes signals so bursty in AS_Q?Continuous acoustic sources can produce 5x bursts in AS_Q.
Microphone signal (BP) from sound injection at REFL port
Band Pass on resulting acoustic peak in AS_Q
Bursts correspond with slight drops in arm power
Makes vetoing more complex!
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LIGO-G050217-00-Z 12
S4 LHO LVEA acoustic coupling from PEM injections
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LIGO-G050217-00-Z 13
S4 LHO out-station acoustic coupling
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LIGO-G050217-00-Z 14
S4 LLO corner and EY acoustic coupling
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LIGO-G050217-00-Z 15
S4 LHO EX, EY magnetic couplingWith predicted upper limits to displacement noise from coupling of ambient fields.
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LIGO-G050217-00-Z 16
PEM burst injection logs (also in elog)
LHO LLO
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LIGO-G050217-00-Z 17
SummaryI. Pre-S4 partial fixes
a. Wandering chiller seismic peak (D.Q. flag for 16 Hz?)b. 10 Hz from RFIDc. Transformers near test masses (ion pump supplies?)d. Crab protection (LHO out-stations, LLO?)
II. Some S4 Issues
a. Up-conversion of low frequency “continuous” seismic noiseb. Veto up-converting 0.7-2 Hz seismic transientsc. Continuous environmental sources can produce AS_Q bursts
III. Preliminary coupling results from S4 PEM injections
a. LHO LVEA ambient sound level generally less than 1/5 SRD above 60 Hz
b. LHO out-station ambient sound level generally less than 1/10 SRDc. 60 Hz peak in AS_Q may be dominated by direct coupling of ambient
magnetic fields
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LIGO-G050217-00-Z 18
Mechanical shaker near corner of chamber produces pitch, yaw and displacement motion as well as causing up-conversion in AS_Q.
Mechanical shaker beside chamber produces side motion, but little pitch, yaw or displacement, and does not produce up-conversion.
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LIGO-G050217-00-Z 19