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| [[LCGT/subgroup/ifo/ISC/IFOParameters/BeforeBW|Old parameter sets]] (before 2010) |
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| ||Parameter||LCGT BRSE(2004)<<FootNote(2004 data referred to [[http://gw.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=30&version=1|LCGT design document 1.0]].)>>||LCGT BRSE(2007)<<FootNote(2007 data referred to [[http://gw.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=30|LCGT design document 2.0]] and [[attachment:LCGT/subgroup/ifo/ISC/CoreDocuments/TAC.ppt|TAC presentation]] at 2005/8/23)>>||LCGT BRSE(2009)||LCGT DRSE(2009)||units|| ||Wave length||1064||1064||1064||1064||nm|| ||Initial Laser Power||300||150||150||150||W|| ||Injecting Laser Power into IFO||100||75(carrier)||75||75||W|| ||Modulation depth||Not defined||Not defined|| || || || ||RF freq 1||15.025(AM)||9.98125(AM)|| || ||MHz|| ||RF freq 2||49.5825(PM)||59.8875(PM)|| || ||MHz|| ||MC1 length||9.755||9.755|| || ||m|| ||MC2 length||199.78||180.463?|| || ||m|| ||MC1 FSR||15.525||15.525|| || ||MHz|| ||MC2 FSR||0.75125||0.831771?|| || ||MHz|| ||MC1 Finesse||1720||1720|| || ||MHz|| ||MC2 Finesse||1000||1000|| || ||MHz|| || || || || || || || ||EM Reflectivity||0.99995||0.99995|| 0.99995 || 0.99995 || || ||FM Reflectivity||0.995||0.996|| 0.992 || 0.992 || || ||PRM Reflectivity||0.76||0.80|| 0.77 || 0.77 || || ||SRM Reflectivity||0.68||0.77|| 0.88 || 0.88 || || ||BS Reflectivity||0.5?||0.5?|| 0.5 || 0.5 || || ||EM Transmittance||2e-5||2e-5|| 3e-5 || 3e-5 || || ||FM Transmittance||0.00497||0.00399|| 0.00798 || 0.00798 || || ||PRM Transmittance||0.23997||0.19999|| 0.22998 || 0.22998 || || ||SRM Transmittance||0.31997||0.22999|| 0.11998 || 0.11998 || || ||BS Transmittance||0.49997?||0.49999?|| || || || ||EM Loss||3e-5||1e-5(3e-5?)|| 2e-5 || 2e-5 || || ||FM Loss||3e-5||1e-5(3e-5?)|| 2e-5 || 2e-5 || || ||PRM Loss||3e-5||1e-5(3e-5?)|| 2e-5 || 2e-5 || || ||SRM Loss||3e-5||1e-5(3e-5?)|| 2e-5 || 2e-5 || || ||BS Loss ||3e-5||1e-5(3e-5?)|| || || || || || || || || || || ||Arm cavity length||3000||3000||3000||3000||m|| ||PR cavity length||14.9899?||45?|| || ||m|| ||PRM-BS length||Not defined||Not defined|| || ||m|| ||BS-FM X length||Not defined||Not defined|| || ||m|| ||BS-FM Y length||Not defined||Not defined|| || ||m|| ||Asymmetry length||1.4990?||7.5?|| || ||m|| ||SR cavity length||17.9878?||45?|| || ||m|| ||SRM-BS length||Not determined||Not determined|| || ||m|| ||SRC detuning phase||pi/2||pi/2||pi/2|| 1.343 ||rad|| || || || || || || || ||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||Not defined||Not defined|| 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|| |
||<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|| ||<bgcolor="#FFFF00":colspan="4"> '''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|| ||<bgcolor="#FFFF00":colspan="4"> '''Primary parameters of interferometer''' || ||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.)>> || 374k = 75 * 10.4 * 960 /2|| ||W|| ||PRC power on BS || 780 = 75 * 10.4 || ||W|| ||<bgcolor="#FFFF00":colspan="4"> '''Cavity Length''' || ||Arm cavity length || 3000 || ||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|| ||<bgcolor="#FFFF00":colspan="4"> '''Mirror optical properties''' || ||EM Reflectivity || 0.999945 || || || ||FM Reflectivity || 0.996000 || || || ||PRM Reflectivity || 0.900000 || || || ||SRM Reflectivity || 0.846400 = 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 || :-? 1000e-6 || || || || || || || || ||Bulk loss (absorption) (large optics ??? for Sapphire: ???FM, EM) || :-? 20 || || ppm || ||Bulk loss (absorption) (small optics ??? for Fused Silica: ???) || :-? 2.5 || || ppm || || || || || || ||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 || || || || || || || || || ||<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|| || || || || || ||<bgcolor="#FFFF00":colspan="4"> '''Mode Cleaner''' || ||MC1 length || B) 10.0 || ||m|| ||MC2 length || B) 13.324109 || ||m|| ||MC1 Finesse || X-( TBD || || || ||MC2 Finesse || X-( TBD || || || || || || || || ||<bgcolor="#FFFF00":colspan="4"> '''Output Mode Cleaner''' || ||OMC length || 1.5 || ||m|| ||OMC Finesse || 2000 || || || ||OMC input/output mirror reflectivity || X-( TBD || || || ||OMC end mirror reflectivity || X-( TBD || || || ||OMC MC FSR || ??? || ||MHz|| ||DC readout phase || 134.7 || 121.8 || degree || ||<bgcolor="#FFFF00":colspan="4"> '''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) || || || || || || || || |
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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 Primary parameters of interferometer Arm cavity Finesse 1546 Arm cavity power gain 960 PR gain 10.4 Arm power (single arm)2 374k = 75 * 10.4 * 960 /2 W PRC power on BS 780 = 75 * 10.4 W Cavity Length Arm cavity length 3000 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 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 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 Mode Cleaner MC1 length m MC2 length m MC1 Finesse MC2 Finesse 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)
1000e-6
20
2.5
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
10.0
13.324109
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)