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||Parameter||LCGT VRSE-D (2010)<<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 VRSE-B (2010)<<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)>> ||units|| || || || || || ||Wave length||1064||1064||nm|| ||Initial Laser Power||150||150||W|| ||Injecting Laser Power into IFO||75 (carrier)||75||W|| ||Modulation depth||Not defined||Not defined|| || ||RF freq 1|| || ||MHz|| ||RF freq 2|| || ||MHz|| ||MC1 length|| || ||m|| ||MC2 length|| || ||m|| |
||<align="center">'''Parameter'''||<align="center":width="10%">'''LCGT VRSE-D'''<<FootNote([[http://gw.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/subgroup/ifo/BW|Special Working Group Report]].)>>||<align="center":width="10%">'''LCGT VRSE-B''' ||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|| 11.25 (PM) || ||MHz|| ||RF freq 2|| 45.00 (PM) || ||MHz|| ||MC1 length|| 13.324109 || ||m|| ||MC2 length|| 13.324109 || ||m|| |
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||<bgcolor="#FFFF00":colspan="4"> '''Cavity 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 || || ||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|| |
|
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||EM Reflectivity || 0.99995 || 0.99995 || || ||FM Reflectivity || || || || ||PRM Reflectivity || || || || ||SRM Reflectivity || || || || ||BS Reflectivity || || || || ||EM Transmittance || || || || ||FM Transmittance || || || || ||PRM Transmittance || || || || ||SRM Transmittance || || || || ||BS Transmittance || || || || ||EM Loss || 2e-5 || 2e-5 || || ||FM Loss || 2e-5 || 2e-5 || || ||PRM Loss || 2e-5 || 2e-5 || || ||SRM Loss || 2e-5 || 2e-5 || || ||BS Loss || 2e-5 || 2e-5 || || |
||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|| |
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||Arm cavity length || 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|| || || || || || || || |
||EM thickness || 15 || ||cm|| ||FM thickness || 15 || ||cm|| ||PRM thickness || <:( Not defined || ||cm|| ||SRM thickness || <:( Not defined || ||cm|| ||BS thickness || <:( Not defined || ||cm|| ||<bgcolor="#FFFF00":colspan="4"> '''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 || :-? 1000e-6 || || || || || || || || ||Bulk loss (absorption) (large optics: ???FM, EM) || :-? 20 || || ppm/cm || ||Bulk loss (absorption) (small optics: ???) || :-? 2.5 || || ppm/cm || || || || || || |
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||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|| |
||<bgcolor="#FFFF00":colspan="4"> '''Output Mode Cleaner''' || ||OMC input/output mirror reflectivity || || || || ||OMC end mirror reflectivity || || || || ||OMC length || 1.5 || ||m|| ||OMC MC FSR || ??? || ||MHz|| ||OMC Finesse || 2000 || ||MHz|| ||<bgcolor="#FFFF00":colspan="4"> '''Control Bandwidth''' || ||Quantum efficiency || 0.9 || || || ||Frequency Stabilization band width || 30k || ||Hz|| ||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 || |
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 |
11.25 (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 |
||
Cavity 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 |
|
|
m |
||
SRM-BS length |
|
|
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: ???FM, EM) |
|
|
ppm/cm |
||
Bulk loss (absorption) (small optics: ???) |
|
|
ppm/cm |
||
|
|
|
|
||
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 |
|
|
|
|
|
|
|
Output Mode Cleaner |
|||||
OMC input/output mirror reflectivity |
|
|
|
||
OMC end mirror reflectivity |
|
|
|
||
OMC length |
1.5 |
|
m |
||
OMC MC FSR |
??? |
|
MHz |
||
OMC Finesse |
2000 |
|
MHz |
||
Control Bandwidth |
|||||
Quantum efficiency |
0.9 |
|
|
||
Frequency Stabilization band width |
30k |
|
Hz |
||
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 |
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