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| ||<align="center":width="20%">'''Parameter'''||<align="center":width="15%">'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/subgroup/ifo/BW|Special Working Group Report]].)>>||<align="center":width="15%">'''LCGT VRSE-B''' ||<align="center":width="5%"> units|| | ||<align="center":width="20%">'''Parameter'''||<align="center":width="15%">'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/subgroup/ifo/BW|Band-Width Special Working Group]].)>>||<align="center":width="15%">'''LCGT VRSE-B''' ||<align="center":width="5%"> units|| |
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| ||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|| 13.324109 || ||m|| ||MC2 length|| 13.324109 || ||m|| ||MC1 FSR|| || ||MHz|| ||MC2 FSR|| || ||MHz|| ||MC1 Finesse|| || ||MHz|| ||MC2 Finesse|| || ||MHz|| |
||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 || 11.25M (PM) || ||Hz|| ||RF freq 2 || 45.00M (PM) || ||Hz|| ||MC1 length || 13.324109 || ||m|| ||MC2 length || B) 13.324109 || ||m|| ||MC1 Finesse || X-( TBD || || || ||MC2 Finesse || X-( TBD || || || |
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| ||Arm cavity FSR || || ||MHz|| | |
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| ||PRC cavity FSR || || ||MHz|| | |
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| ||  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 || || ||m|| ||SRM-BS length || || ||m|| |
||Asymmetry length || 3.33103 || ||m|| ||BS-FM length || 25 || ||m|| ||SR cavity length || 73.2826 || ||m|| |
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| ||PRM mass || <:( Not defined || ||kg|| ||SRM mass || <:( Not defined || ||kg|| ||BS mass || <:( Not defined || ||kg|| |
||PRM mass || <:( TBD || ||kg|| ||SRM mass || <:( TBD || ||kg|| ||BS mass || <:( TBD || ||kg|| |
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| ||FM AR ROC || <:( Not defined || ||m|| ||PRM ROC || <:( Not defined || ||m|| ||SRM ROC || <:( Not defined || ||m|| |
||FM AR ROC || <:( TBD || ||m|| ||PRM ROC || <:( TBD || ||m|| ||SRM ROC || <:( TBD || ||m|| |
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| ||PRM thickness || <:( Not defined || ||cm|| ||SRM thickness || <:( Not defined || ||cm|| ||BS thickness || <:( Not defined || ||cm|| |
||PRM thickness || <:( TBD || ||cm|| ||SRM thickness || <:( TBD || ||cm|| ||BS thickness || <:( TBD || ||cm|| |
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| ||Bulk loss (absorption) (large optics: ???FM, EM) || :-? 20 || || ppm/cm || ||Bulk loss (absorption) (small optics: ???) || :-? 2.5 || || ppm/cm || |
||Bulk loss (absorption) (large optics ??? for Sapphire: ???FM, EM) || :-? 20 || || ppm/cm || ||Bulk loss (absorption) (small optics ??? for Fused Silica: ???) || :-? 2.5 || || ppm/cm || |
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| ||OMC input/output mirror reflectivity || X-( To be designed|| || || ||OMC end mirror reflectivity || X-( To be designed || || || |
||OMC input/output mirror reflectivity || X-( TBD || || || ||OMC end mirror reflectivity || X-( TBD || || || |
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| Length Sensing Scheme Review by Somiya (Japanese) [[attachment:lcgtrse.pdf]] | |
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| Length Sensing Scheme Review for advLIGO by Somiya [[attachment:AdvLIGO-LSCv4.pdf]] |
Interferometer Parameters
Old parameter sets (before 2010)
(Classical-noise parameters are here) Parameter LCGT VRSE-D1 LCGT VRSE-B 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 11.25M (PM) Hz RF freq 2 45.00M (PM) Hz MC1 length 13.324109 m MC2 length m MC1 Finesse MC2 Finesse Parameters of interferometer Arm cavity Finesse Arm power gain Arm power(single) MW Arm cavity cut-off frequency Hz PR gain PRC power on BS W PR cavity cut-off frequency Hz PR-Arm cut-off frequency Hz SR gain Signal band Hz MICH contrast Other losses in PRC Other losses in SRC Cavity Length Arm cavity length 3006.69 m PR cavity length 73.2826 m Asymmetry length 3.33103 m BS-FM length 25 m SR cavity length 73.2826 m SRC detuning phase 0.05934 = 3.4 degree 0 rad Mirror geometries or mechanical properties EM mass 30 kg FM mass 30 kg PRM mass kg SRM mass kg BS mass kg EM ROC 7113.900 m FM ROC 7113.900 m FM AR ROC m PRM ROC m SRM ROC m BS ROC Infinity m EM thickness 15 cm FM thickness 15 cm PRM thickness cm SRM thickness cm BS thickness cm 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 HR Coating Loss of EM, FM, PRM and SRM 45e-6 BS Loss 100e-6 Transmissivity 1 - R - Loss AR Transmissivity 0.999 AR Coating Loss Bulk loss (absorption) (large optics ??? for Sapphire: ???FM, EM) ppm/cm Bulk loss (absorption) (small optics ??? for Fused Silica: ???) ppm/cm Output Mode Cleaner OMC length 1.5 m OMC Finesse 2000 OMC input/output mirror reflectivity OMC end mirror reflectivity OMC MC FSR ??? MHz Control Bandwidth Quantum efficiency 0.9 CARM control band width 30k Hz DARM control band width 200 Hz PRC control band width 50 Hz MICH control band width 50 Hz SRC control band width 50 Hz Feed-Forward gain -0.97 1/(1-0.97) = 30
13.324109
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1000e-6
20
2.5
TBD
TBD
To do list to define parameters for 2009
Reference