Status of the LHO PSLs
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LIGO-G010310-00-W
Status of the LHO PSLs
Rick SavageLIGO Hanford Observatory
LIGO Scientific Collaboration MeetingAugust 13-16, 2001
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LSC Meeting - August 2001 2LIGO-G010310-00-W
(Selected) PSL issues
Improved optics layout
Optical table support legs
NPRO frequency glitches
Reference cavity tidal correction servo
Intensity stabilization
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LSC Meeting - August 2001 3LIGO-G010310-00-W
Revised PSL/IOO optics layout
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LSC Meeting - August 2001 4LIGO-G010310-00-W
Improved frequency noise
Number of optical components reduced
Path lengths shortened
Reference cavity orientation changed
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LSC Meeting - August 2001 5LIGO-G010310-00-W
Frequency noise – table leg resonances
Bolts tightBolts loose
Stacis system did not work-electronics noise
We will try PEPS systemASAP
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LSC Meeting - August 2001 6LIGO-G010310-00-W
2 sec.
5 MHz
NPRO frequency glitches
Approximately one per day
Alternates between step up and step down
T. Kane attributes to mode instability in pump laser diode
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LSC Meeting - August 2001 7LIGO-G010310-00-W
Tidal corection servo
Reduce susceptibility to room temperature fluctuations
1 mK >> mcommon mode arm length
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LSC Meeting - August 2001 8LIGO-G010310-00-W
Tidal servo (cont.)
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LSC Meeting - August 2001 9LIGO-G010310-00-W
Tidal servo sensor noise
25 mK
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LSC Meeting - August 2001 10LIGO-G010310-00-W
Intensity stabilization servo
First loop of prototype system operational on2-km interferometer.(R. Karwoski, P. Russell, D. Ottaway)
Inside the loopafter PMC
Outside the loopafter MC
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LSC Meeting - August 2001 11LIGO-G010310-00-W
RIN after modecleaner
P/P ~6.8e-8/rtHz
Detector noise floor(laser light blocked)
Light on PD = 0.5 mW >> 4.6e-8/rtHz shot noise limit
Only “inside” loopactive