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Size: 4937
Comment:
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Size: 5011
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 91: | Line 91: |
| ||Frequency Stabilization band width || 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|| |
||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
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1000e-6
20
2.5
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