'''[[../|..Up]]'''


== Interferometer Parameters ==
[[LCGT/subgroup/ifo/ISC/IFOParameters/BeforeBW|Old parameter sets]] (before 2010)

(Classical-noise parameters are [[LCGT/subgroup/ifo/ISC/ClassicalNoise|here]])
~-
||<align="center":width="20%">'''Parameter'''||<align="center":width="15%">'''LCGT VRSE-D'''<<FootNote([[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            || 1900 || ||m||
||FM ROC            || 1900 || ||m||
||FM AR ROC         || Flat || ||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) || || ||
|| || || || ||


[[LCGT/subgroup/ifo/ISC/TaskList/CurrentStatus/ToDo|To do list]] to define parameters for 2009
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== Reference ==


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