TRY Bench TRY Bench TRY QPD TRY QPD TRY QPD2 Green TRY QPD2 Green TRY_QPD2_GR DC DC DC DC TRY QPD1 High Gain TRY QPD2 High Gain TRY_QPD2_HG DC DC DC DC TRY QPD1 Green TRY QPD1 Green DC DC DC DC TRY_QPD1_GR TRY QPD1 High Gain TRY QPD1 High Gain TRY_QPD1_HG DC DC DC DC In Vacuum In Vacuum TRY IR QPD TRY IR QPD TRY QPD1 Low Gain TRY QPD2 Low Gain TRY_QPD2_LG DC DC DC DC TRY QPD1 Low Gain TRY QPD1 Low Gain TRY_QPD1_LG DC DC DC DC TRY_CCD TRX Bench TRX Bench TRX QPD TRX QPD TRX QPD1 High Gain TRX QPD2 High Gain TRX_QPD2_HG DC DC DC DC TRX QPD1 Green TRX QPD1 Green DC DC DC DC TRX_QPD1_GR TRX QPD2 Green TRX QPD2 Green TRX_QPD2_GR DC DC DC DC TRX QPD1 High Gain TRX QPD1 High Gain TRX_QPD1_HG DC DC DC DC In Vacuum In Vacuum TRX IR QPD TRX IR QPD TRX QPD2 Low Gain TRX QPD2 Low Gain TRX_QPD2_LG DC DC DC DC TRX QPD1 Low Gain TRX QPD1 Low Gain TRX_QPD1_LG DC DC DC DC TRX_CCD SR2 Bench SR2 Table Green Y RFPD Green X RFPD Q GRY I DC Green Y Injection Optics SR3 Bench SRM Table POX POX POX1 POX1_Q POX1_I POX2 POX2_Q POX2_I PR2 Bench PR2 Bench Green X RFPD Green X RFPD Q GRX I DC POP High Gain RFPD POP High Gain RFPD Q POP1_HG I POP2_HG Q I DC DC In Vacuum In Vacuum POP QPD POP QPD POP1 QPD2 POP1 QPD2 POP1_QPD2 Q Q I I I I Q Q DC DC DC DC POP1 QPD1 POP1 QPD1 POP1_QPD1 Q Q I I I I Q Q DC DC DC DC POP2 QPD2 POP2 QPD2 POP2_QPD2 Q Q I I I I Q Q DC DC DC DC POP2 QPD1 POP2 QPD1 POP2_QPD1 Q Q I I I I Q Q DC DC DC DC POP Low Gain RFPD POP Low Gain RFPD Q POP1_LG I POP2_LG Q I DC DC Green X Injection Optics PRM Bench PRM Bench POY POY POY1 POY1_Q POY1_I POY2 POY2_Q POY2_I MC Trans Monitor MC Trans Monitor In Vacuum In Vacuum Transmission of IMMT1 mirror is detected by an in-vac PD. This is used for the intensity stabilization. MC_TRANS DC REFL Bench REFL Bench REFL High Gain RFPD REFL High Gain RFPD Q REFL1_HG I REFL2_HG Q I REFL3_HG Q I In Vacuum In Vacuum REFL Low Gain RFPD REFL Low Gain RFPD Q REFL1_LG I REFL2_LG Q I REFL3_LG Q I REFL QPD REFL QPD REFL2 QPD1 REFL2 QPD1 REFL2_QPD1 Q Q I I I I Q Q DC DC DC DC REFL1 QPD1 REFL1 QPD1 REFL1 QPD1 Q Q I I I I Q Q DC DC DC DC REFL2 QPD2 REFL2 QPD2 REFL2_QPD2 Q Q I I I I Q Q DC DC DC DC REFL1 QPD2 REFL1 QPD2 REFL1 QPD2 Q Q I I I I Q Q DC DC DC DC MC Bench MC Bench MC QPD2 MC QPD2 MC_QPD2 Q Q I I I I Q Q DC DC DC DC MC QPD1 MC QPD1 MC_QPD1 Q Q I I I I Q Q DC DC DC DC MC Low Gain RFPD MC Low Gain RFPD Q MC_LG I MC High Gain RFPD MC High Gain RFPD Q MC_HG I PMC Trans Monitor PMC Trans Monitor Transmission of PMC is picked off by a low reflectivity mirror. This is used for the intensity stabilization. PMC_TRANS DC Squeezed Light Injection Bench Squeezed Light Injection Bench AS Bench AS Bench AS High Gain RFPD AS High Gain RFPD Q AS1_HG I In Vacuum In Vacuum AS Low Gain RFPD AS Low Gain RFPD Q AS1_LG I AS QPD AS QPD AS1 QPD2 AS1 QPD2 AS1 QPD2 Q Q I I I I Q Q DC DC DC DC AS1 QPD1 AS1 QPD1 AS1 QPD1 Q Q I I I I Q Q DC DC DC DC ETMXb Chamber ETMXi Chamber ETMYb Chamber ETMYi Chamber SRM Chamber SR2 Chamber SR3 Chamber ITMYi Chamber ITMYb Chamber ITMXi Chamber ITMXb Chamber BS Chamber PR3 Chamber PR2 Chamber PRM Chamber IMMT1 REFL Chamber POP/Green Chamber IMCF IMCE Input Faraday IMMT2 Output Faraday /OMMT2 OMC/OMMT1 TRX TRY PMC Laser Reference Cavity