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Status of the LHO PSLs

Status of the LHO PSLs. Rick Savage LIGO Hanford Observatory LIGO Scientific Collaboration Meeting August 13-16, 2001. Improved optics layout Optical table support legs NPRO frequency glitches Reference cavity tidal correction servo Intensity stabilization. (Selected) PSL issues.

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Status of the LHO PSLs

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  1. Status of the LHO PSLs Rick Savage LIGO Hanford Observatory LIGO Scientific Collaboration MeetingAugust 13-16, 2001

  2. Improved optics layout Optical table support legs NPRO frequency glitches Reference cavity tidal correction servo Intensity stabilization (Selected) PSL issues LSC Meeting - August 2001

  3. Revised PSL/IOO optics layout LSC Meeting - August 2001

  4. Improved frequency noise • Number of optical components reduced • Path lengths shortened • Reference cavity orientation changed LSC Meeting - August 2001

  5. Frequency noise – table leg resonances Bolts tight Bolts loose Stacis system did not work-electronics noise We will try PEPS system ASAP LSC Meeting - August 2001

  6. 5 MHz 2 sec. NPRO frequency glitches • Approximately one per day • Alternates between step up and step down • T. Kane attributes to mode instability in pump laser diode LSC Meeting - August 2001

  7. Tidal corection servo Reduce susceptibility to room temperature fluctuations 1 mK >> 1 mmcommon mode arm length LSC Meeting - August 2001

  8. Tidal servo (cont.) LSC Meeting - August 2001

  9. Tidal servo sensor noise 25 mK LSC Meeting - August 2001

  10. Intensity stabilization servo • First loop of prototype system operational on2-km interferometer.(R. Karwoski, P. Russell, D. Ottaway) Inside the loopafter PMC Outside the loop after MC LSC Meeting - August 2001

  11. RIN after modecleaner Only “inside” loopactive DP/P ~6.8e-8/rtHz Detector noise floor(laser light blocked) Light on PD = 0.5 mW >> 4.6e-8/rtHz shot noise limit LSC Meeting - August 2001

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