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Size: 5889
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Size: 5854
Comment:
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| ||<bgcolor="#FFFF00":colspan="4"> '''Cabity Length''' || ||Arm cavity length || 3006.69 || ||m|| ||PR cavity length || 73.2826 || ||m|| ||PRM-BS length || 48.2826 || ||m|| ||BS-FM X length || 26.665515 || ||m|| ||BS-FM Y length || 23.334485 || ||m|| ||Asymmetry length || 3.33103 || ||m|| ||SR cavity length ||17.9878?||45?|| || ||m|| ||SRM-BS length ||Not determined||Not determined|| || ||m|| ||SRC detuning phase|| 0.05934 = 3.4 degree || pi/2 || ||rad|| |
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| || || || || || ||Arm cavity length || 3006.69 || ||m|| ||PR cavity length || 73.2826 || ||m|| ||PRM-BS length || 48.2826 || ||m|| ||BS-FM X length || 26.665515 || ||m|| ||BS-FM Y length || 23.334485 || ||m|| ||Asymmetry length || 3.33103 || ||m|| ||SR cavity length ||17.9878?||45?|| || ||m|| ||SRM-BS length ||Not determined||Not determined|| || ||m|| ||SRC detuning phase|| 0.05934 = 3.4 degree || pi/2 || ||rad|| |
Interferometer Parameters
Old parameter sets (before 2010)
(Classical-noise parameters are here) Parameter LCGT VRSE-D (2010)1 LCGT VRSE-B (2010)2 units Laser source Wave length 1064 nm Initial Laser Power 150 W Injecting Laser Power into IFO 78.48 (in total), 75 (carrier) W Modulation depth 0.3 for both RF freq 1 11.25 (PM) MHz RF freq 2 45.00 (PM) MHz MC1 length m MC2 length m MC1 FSR MHz MC2 FSR MHz MC1 Finesse MHz MC2 Finesse MHz Cabity Length Arm cavity length 3006.69 m PR cavity length 73.2826 m PRM-BS length 48.2826 m BS-FM X length 26.665515 m BS-FM Y length 23.334485 m Asymmetry length 3.33103 m SR cavity length 17.9878? 45? m SRM-BS length Not determined Not determined m SRC detuning phase 0.05934 = 3.4 degree pi/2 rad Mirror optical properties EM Reflectivity 0.999945 FM Reflectivity 0.996 PRM Reflectivity 0.9 SRM Reflectivity 0.8464 = 0.92^2 BS Reflectivity 0.5 EM Loss 45e-6 FM Loss 45e-6 PRM Loss 45e-6 SRM Loss 45e-6 BS Loss 100e-6 Transmittance 1 - R - Loss Arm cavity FSR 0.05 0.05 MHz PRC cavity FSR 19.3166 6.7 MHz Arm cavity Finesse 1250 1548 777 777 Arm power gain 796 987 Arm power(single) 0.398 0.3859 0.202 0.202 MW PR gain 10 10.63 11 11 PRC power on BS 1000 797.14 825 825 W SR gain 10 14.68 ? N/A Arm cavity cut-off frequency 16.14 31.8 31.8 Hz PR cavity cut-off frequency 1.209e6 Hz PR-Arm cut-off frequency 1.189 2.3 2.3 Hz Signal band 236.9 Hz MICH contrast 0.995 0.995 Other losses in PRC Not defined 1e-3 0.02/PRG 0.02/PRG Other losses in SRC Not defined 0.02/SRG 0.02/SRG EM mass 50.9 30 30 30 kg FM mass 50.9 30 30 30 kg PRM mass Not defined Not defined kg SRM mass Not defined Not defined kg BS mass Not defined Not defined kg EM ROC 4500 4500 4500 4500 m FM ROC Infinity Infinity Infinity Infinity m FM AR ROC 12 ?? Infinity Infinity m PRM ROC 0.81 ?? m SRM ROC Not defined Not defined m BS ROC Infinity Infinity m EM AR Reflectivity Not defined 1e-3 FM AR Reflectivity Not defined 1e-3 PRM AR Reflectivity Not defined 1e-3 SRM AR Reflectivity Not defined 1e-3 BS AR Reflectivity Not defined 1e-3 EM AR Loss Not defined Not defined FM AR Loss Not defined Not defined PRM AR Loss Not defined Not defined SRM AR Loss Not defined Not defined BS AR Loss Not defined Not defined EM absorption loss (bulk) 20 20 ppm/cm FM absorption loss (bulk) 20 20 20 20 ppm/cm EM absorption loss (coat) ppm FM absorption loss (coat) <1 <1 ppm PRM absorption loss 5 5 ppm/cm SRM absorption loss 5 5 ppm/cm BS absorption loss 5 5 ppm/cm EM thickness 18 15 15 15 cm FM thickness 18 15 15 15 cm PRM thickness Not defined Not defined cm SRM thickness Not defined Not defined cm BS thickness Not defined Not defined cm EM bulk Loss 1000 1000 ppm FM bulk Loss 1000 1000 ppm PRM bulk Loss 1000 1000 ppm SRM bulk Loss 1000 1000 ppm BS bulk Loss 1000 1000 ppm OMC input/output mirror reflectivity 0.8 0.8 OMC end mirror reflectivity 0.99995 0.99995 OMC length 0.07 0.07 m OMC MC FSR 4282 4282 MHz OMC Finesse 14 14 MHz Quantum efficiency 0.9 0.9 Frequency Stabilization band width 10000 10000 Hz CARM control band width Not defined 0.1 Hz DARM control band width Not defined 1000 Hz PRC control band width Not defined 1000 Hz MICH control band width Not defined 10 Hz SRC control band width Not defined 1000 Hz
To do list to define parameters for 2009
Reference
Length Sensing Scheme Review by Somiya (Japanese) lcgtrse.pdf
Length Sensing Scheme Review for advLIGO by Somiya AdvLIGO-LSCv4.pdf
2004 data referred to LCGT design document 1.0. (1)
2007 data referred to LCGT design document 2.0 and TAC presentation at 2005/8/23 (2)