DOC PREVIEW
Scattering Loss

This preview shows page 1-2-3-4-5 out of 14 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 14 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 14 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 14 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 14 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 14 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 14 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

LSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-EScattering LossHiro Yamamoto - Caltech LIGOLIGO I mirror loss estimation»surface figure, micro roughness and larger angle scatteringLIGO I mirror surface qualities»polished surface data by CSIRO and coated surface data by LIGODoes not include new issues of LMA mirrors»bubbles, AR coating, etcAdvanced LIGO loss requirement»implication of the LIGO I mirror qualityDiffractive loss in stable Michelson cavity»Loss due to the “effective long distance propagation” in the stable Michelson cavity1LSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ECrude estimation ofloss budgets in a LIGO I arm20 10 20 30 40 50 6030405060708090H2 H1 L1 power recycling gainextra loss [ppm]50ppm ?Recycling gain as a function of extra loss per mirror in FFT simulation30 40 50 60 70 80Recycling gain, visibility, etc are consistent with 140 ppm loss per armknown loss per arm »surface figure (λ>0.5cm) : 10 ppm / mirror x 2» ETM transmission : 7 ppm» absorption : 4ppm / mirror x 2» diffractive loss : 2ppm140ppm total loss - known loss = 100 ppm / arm or 50 ppm / mirrorLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-EPolished (CSIRO) vs coated (LIGO) surface data3YXXIntegrating sphereCaltech PhasemapCSIRO LADICSIRO TOPO7 x 10-19 f-1.45Bill KValery FFFTSimulationA 300-mm aperture phase shifting fizeau interferometerCSIRO LADICSIRO TOPOthree dimensionalnoncontact optical profilersurface figure lossLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-Esurface figureCSIRO vs Phasemap PSD410−310−210−110010110−410−310−210−11001011024ITM06 SUB XSUB YPOL XPOL YCSIRO PSDCSIRO and CIT phase data1D psd tilt and power subtractedCSIRO - uncoated surfaceCIT - coated surface 0.00000010.0000010.000010.00010.0010.010.11100.001 0.01 0.1 1 10 1001/mmmm nm^2CIT ETM03 6xCIT ETM02CSIRO ETM 02CSIRO ETM02 2.5x1 / mmLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ESurface figure loss of AdvLIGOloss per arm : rms = 1nm vs 0.5nm5 0 2 4 6 8 10 12 14 16 18 0 20 40 60 80 100 120 140 160loss per mirror population0.5 nm1.0 nmLIGO I mirror phasemap in advLIGO armrms = 0.44nmrms = 1nmrms = 0.5nmloss : ppm / mirror30ppmbased on 80 simulatedsurfaces eachLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ELoss in the least investigated region : λ ~ 1mm6YXXIntegrating sphereCaltech PhasemapCSIRO LADICSIRO TOPO7 x 10-19 f-1.45Bill KValery FFFTSimulationintermediate region•loss by integral of CSIRO fit in 2~100 cm-1= 26ppm•low end : LIGO < CSIRO•high end : LIGO > CSIROLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-EYXXIntegrating sphereCaltech PhasemapCSIRO LADICSIRO TOPO7 x 10-19 f-1.45Bill KValery FOrange peel- psd shows bumps at ~0.3 cm -7loss ~ 2.4 ppmnew FFT grid size = 0.14 ~ 0.28cmloss ~ 1.3 ppm x 2old FFT : loss(35cm/256) - loss(35cm/128)Caltech phasemapCSIROPSD~10ppmBill K estimatedLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ELarge angle scattering loss8YXXIntegrating sphereCaltech PhasemapCSIRO LADICSIRO TOPO7 x 10-19 f-1.45Bill KValery FFFTSimulationlarge angle scattering lossBill Kells H1 ITMy June 2003Valera L1 ITMxy&ETMxy October 2007Scatterometer port 5.5 10-8 Sr ITMMain arm beam•In situ, large angle measurement : PDLiyuan •Caltech OTF : integrating sphereLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ELarge angle scatteringLLO ITM/ETM by Valery Frolov 910210310410!2710!2610!2510!2410!23k (1/cm)1D PSD (m3) ITMXITMYETMXETMYCSIRO PSD FITFIT < 5 degreeFIT allloss : 3.6ppmloss : 22ppmloss : 20ppmloss : 1 ~ 50 degreeLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-EIntegrating sphere dataLiyuan, Herena (T070233) 101cm x 1cm0.3mm beam size0.1mm step1.5°14.13 ppm21.42 ppm17.30 ppm11.25 ppm12.07 ppm7.157 ppm10.49 ppmLSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-EAdvanced LIGOtotal arm loss budget = 70ppmknown loss : ~ 50 ppm / arm» diffraction : 0.4 ppm» absorption : 0.5 ppm x 2» surface figure : 20ppm x 2» ETM transmission : 7 ppm11 ppm / mirror for micro roughness, large angle and all other lossesLIGO I mirror : 50 ppm 11LSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ERMSBITMt ETMtMMT2MMT3Baffle24.9cm21.4cmROC = -76.46 m ROC = 1.856 mROC = 31.059 mAperture = 26 cmAperture = 37 cmthickness = 6 cmROC = 2076 mAperture = 34 cm16.585 m16.655 m20.655 m4.5 m3994.75 mw = 2.2 mmR = -76.38 mw = 3.7 mmR = 28.93 mw = 6.1 cmR = 1457 mw = 6.0 cmR = 1432 mR = 0.96 mR = 15.7 mMS-RM R = 1440mDiffraction effect in Stable Michelson cavity12LSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-EBeam profile on MMT3coming from MMT213230ppm65ppm40ppmMMT2RMMMT3 ITM26cmr=13cmdiffraction tailr2 (m2)log(P) vs r2log(P) = -r2/ w2LSC-Virgo meeting @ Hannover on October 24, 2007G070657-00-ESummaryLIGO I mirror loss estimation» Scattering loss per mirror in LIGO I arm (Power Recycling gain, etc) : 50ppm» Loss(λ>5mm) ~ 10 ppm/mirror» Loss(λ~1mm) ~ not well understood ( 3 ~ 30ppm/mirror?? )» Loss(λ<0.1mm) ~ 10 ~ 30ppmLIGO I mirror surface quality - some inconsistencies» λ>5mm : PSD(coated surface) ~0.1 PSD(polished surface)» λ~1mm : not well understood» λ<0.1mm : mesured loss ~ 10 x estimation by polished surface dataAdvanced LIGO loss requirement < 35ppm / mirror» Loss(λ>5mm) ~ 20~25 ppm/mirror with RMS < 0.7nm» Need to understand LIGO I mirror losses and to suppress losses or change the AdvLIGO specification to be more tolerant to extra lossLoss in stable Michelson cavity» Due to far field propagation in the cavity, ~500 ppm loss by diffraction with w(ITM)=6cm.» With asymmetric arm configuration (w(ITM)=5.5cm,w(ETM)=6.2cm), this is suppressed to


Scattering Loss

Download Scattering Loss
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Scattering Loss and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Scattering Loss 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?