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Deletions are marked like this. | Additions are marked like this. |
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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 (AM) || ||Hz|| ||MC1 length || B) 10.0 || ||m|| ||MC2 length || B) 13.324109 || ||m|| ||MC1 Finesse || X-( TBD || || || ||MC2 Finesse || X-( TBD || || || |
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||Arm cavity Finesse || || || || ||Arm power gain || || || || ||Arm power(single) || || ||MW|| ||Arm cavity FSR || || ||MHz|| ||Arm cavity cut-off frequency || || ||Hz|| ||PR gain || || || || ||PRC power on BS || || ||W|| ||PRC cavity FSR || || ||MHz|| ||PR cavity cut-off frequency || || ||Hz|| ||PR-Arm cut-off frequency || || ||Hz|| ||SR gain || || || || ||Signal band || || ||Hz|| |
||Arm cavity Finesse || 1546 || || || ||Arm cavity power gain || 960 || || || ||PR gain || 10.4 || || || ||Arm power (single arm)<<FootNote(Arm power was defined by sum of both arm powers. It should be a stored power of single arm.)>> || 374 = 75 * 10.4 * 960 /2|| ||kW|| ||PRC power on BS || 780 = 75 * 10.4 || ||W|| ||Arm cavity cut-off frequency || || ||Hz|| ||PR cavity cut-off frequency || || ||Hz|| ||PR-Arm cut-off frequency || || ||Hz|| ||SR gain || 24 || || || ||Signal band || || ||Hz|| |
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||PRM-BS length || 48.2826 || ||m|| ||BS-FM X length || 26.665515 || ||m|| ||BS-FM Y length || 23.334485 || ||m|| |
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||SR cavity length || || ||m|| ||SRM-BS length || || ||m|| ||SRC detuning phase|| 0.05934 = 3.4 degree || 0 ||rad|| ||<bgcolor="#FFFF00":colspan="4"> '''Mirror geometries or mechanical properties''' || ||EM mass || 30 || ||kg|| ||FM mass || 30 || ||kg|| ||PRM mass || <:( Not defined || ||kg|| ||SRM mass || <:( Not defined || ||kg|| ||BS mass || <:( Not defined || ||kg|| || || || || || ||EM ROC || 7113.900 || ||m|| ||FM ROC || 7113.900 || ||m|| ||FM AR ROC || <:( Not defined || ||m|| ||PRM ROC || <:( Not defined || ||m|| ||SRM ROC || <:( Not defined || ||m|| ||BS ROC || Infinity || ||m|| || || || || || ||EM thickness || 15 || ||cm|| ||FM thickness || 15 || ||cm|| ||PRM thickness || <:( Not defined || ||cm|| ||SRM thickness || <:( Not defined || ||cm|| ||BS thickness || <:( Not defined || ||cm|| |
||BS-FM length || 25 || ||m|| ||SR cavity length || 73.2826 || ||m|| ||SRC detuning phase|| 86.5 <:( 3.4 ??? || 90.0 ||degree|| |
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||FM Reflectivity || 0.996 || || || ||PRM Reflectivity || 0.9 || || || ||SRM Reflectivity || 0.8464 = 0.92^2 || || || |
||FM Reflectivity || 0.996000 || || || ||PRM Reflectivity || 0.900000 || || || ||SRM Reflectivity || 0.846400 = 0.92^2^ || || || |
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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 || ||Bulk loss (absorption) (small optics ??? for Fused Silica: ???) || :-? 2.5 || || ppm || || || || || || ||<bgcolor="#FFFF00":colspan="4"> '''Mirror geometries''' || ||EM mass || 30 || ||kg|| ||FM mass || 30 || ||kg|| ||PRM mass || <:( TBD || ||kg|| ||SRM mass || <:( TBD || ||kg|| ||BS mass || <:( TBD || ||kg|| || || || || || ||EM ROC || 7113.900 || ||m|| ||FM ROC || 7113.900 || ||m|| ||FM AR ROC || <:( TBD || ||m|| ||PRM ROC || <:( TBD || ||m|| ||SRM ROC || <:( TBD || ||m|| ||BS ROC || Infinity || ||m|| || || || || || ||EM radius/thickness || 25 / 15 || ||cm|| ||FM radius/thickness || 25 / 15 || ||cm|| ||PRM radius/thickness || <:( TBD || ||cm|| ||SRM radius/thickness || <:( TBD || ||cm|| ||BS radius/thickness || <:( TBD || ||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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||DC readout phase || 134.7 || 121.8 || degree || | |
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||Feed-Forward gain || -0.97 || || 1/(1-0.97) = 30 || | ||Feed-Forward gain || -0.97 (openloop), 1/(1-0.97) = 30 (closed loop) || || || |
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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 (AM) Hz MC1 length m MC2 length m MC1 Finesse MC2 Finesse Parameters of interferometer Arm cavity Finesse 1546 Arm cavity power gain 960 PR gain 10.4 Arm power (single arm)2 374 = 75 * 10.4 * 960 /2 kW PRC power on BS 780 = 75 * 10.4 W Arm cavity cut-off frequency Hz PR cavity cut-off frequency Hz PR-Arm cut-off frequency Hz SR gain 24 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 86.5 90.0 degree Mirror optical properties EM Reflectivity 0.999945 FM Reflectivity 0.996000 PRM Reflectivity 0.900000 SRM Reflectivity 0.846400 = 0.922 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 Bulk loss (absorption) (small optics ??? for Fused Silica: ???) ppm Mirror geometries 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 radius/thickness 25 / 15 cm FM radius/thickness 25 / 15 cm PRM radius/thickness cm SRM radius/thickness cm BS radius/thickness 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 DC readout phase 134.7 121.8 degree 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 (openloop), 1/(1-0.97) = 30 (closed loop)
10.0
13.324109
TBD
TBD
3.4 ???
1000e-6
20
2.5
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
To do list to define parameters for 2009
Reference
Arm power was defined by sum of both arm powers. It should be a stored power of single arm. (2)