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||<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|| | ||<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 || || || ||<bgcolor="#FFFF00":colspan="4"> '''Parameters of interferometer''' || ||Arm cavity Finesse || 1546 || || || ||Arm power gain || 960 B) 9984 = 960 x 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.)>> || '''420.5''' B) =\= 374.4 = 75 *9984 /2|| ||kW|| ||Arm cavity cut-off frequency || || ||Hz|| ||PR gain || 10.4 || || || ||PRC power on BS || B) 780 = 75 * 10.4 || ||W|| ||PR cavity cut-off frequency || || ||Hz|| ||PR-Arm cut-off frequency || || ||Hz|| ||SR gain || 11 (not checked yet)|| || || ||Signal band || || ||Hz|| ||MICH contrast || || || || ||Other losses in PRC || || || || ||Other losses in SRC || || || || |
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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 || |
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||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 || || || || || || || || || |
||<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 || || || || ||OMC end mirror reflectivity || || || || |
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||OMC Finesse || 2000 || || || ||OMC input/output mirror reflectivity || X-( TBD || || || ||OMC end mirror reflectivity || X-( TBD || || || |
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||OMC Finesse || 2000 || ||MHz|| | ||DC readout phase || 134.7 || 121.8 || degree || |
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||Frequency Stabilization band width || 30k || ||Hz|| | |
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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 power gain |
960 |
|
|
Arm power (single arm)2 |
420.5 |
|
kW |
Arm cavity cut-off frequency |
|
|
Hz |
PR gain |
10.4 |
|
|
PRC power on BS |
|
|
W |
PR cavity cut-off frequency |
|
|
Hz |
PR-Arm cut-off frequency |
|
|
Hz |
SR gain |
11 (not checked yet) |
|
|
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) |
|
|
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)