The TCS simulation model to estimate the lenses and ROC of the optics is now running. The following lists gives the nominal values and the transfer functions used for all the filters:

ITMX/ITMY:

• TR-X calibration: H1:TCS-ITMX_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• TR-Y calibration: H1:TCS-ITMY_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• Absorption: H1:TCS-ITMX_SIM_SURF_ABSORPTION = 250E-9
• Absorption: H1:TCS-ITMY_SIM_SURF_ABSORPTION = 250E-9
• Surface defocus:
  • ITMX ROC nominal: H1:TCS-ITMX_SIM_SURF_ROC_NOM = 1939.3m (see galaxy website ITM serial number 03)
  • ITMY ROC nominal: H1:TCS-ITMY_SIM_SURF_ROC_NOM = 1939.2m (see galaxy website ITM serial number 11)
  • ITMX/ITMY self absorption transfer function (derived from a COMSOL model and fitted to double-exponential in MATLAB):
    • poles = [1.195E-4, 9.1E-4],
    • zeros = [2.115E-4],
    • steady state gain, H1:TCS-ITMX_SIM_SURF_DEFOCUS_SELF_GAIN = -3.652E-5 diopters per Watt (-ve sign comes from the fact that self-absorption makes the surface flatter, or ROC longer)
  • ITMX/ITMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ITMX/ITMY ring heater transfer function (fitted from COMSOL - surfTFRH):
    • poles = [2.0693E-5, 2.4992E-5]
    • zeros = [8.8689E-6]
    • steady-state gain: H1:TCS-ITMX_SIM_SURF_DEFOCUS_RH_GAIN = +1.06626E-6 diopters per Watt (+ve sign comes from the fact that RH makes optic surface more curved), derived from Figure 4 in T1200465
• Substrate defocus:
  • ITMX/ITMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ITMX/ITMY ring heater thermal lens (single-pass): fitted to LLO measurements
    • poles: [3.908E-5, 6.385E-6]
    • zeros: [2.6983E-6]
    • steady-state gain: H1:TCS-ITMX_SIM_SUB_DEFOCUS_RH_GAIN = -9.0E-6 diopters per Watt (RH cause a -ve lens in the substrate)
  • ITMX/ITMY CO2 laser (single-pass): fitted to data in aLOG 14722
    • poles: [6.413E-4, 6.956E-5]
    • zeros: [1.24E-3]
    • steady-state gain: H1:TCS-ITMX_SIM_SUB_DEFOCUS_CO2_GAIN = +62.3E-6 diopters per Watt (see aLOG 14722)
  • ITMX/ITMY self-heating thermal lens: from COMSOL
    • poles: [5.0827E-4, 8.2714E-5]
    • zeros: [1.3062E-4]
    • steady-state gain: H1:TCS-ITMX_SIM_SUB_DEFOCUS_SELF_GAIN = +4.8709E-4 diopters per Watt (self heating lens is +ve in the substrate)

ETMX/ETMY:

• TR-X calibration: H1:TCS-ETMX_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• TR-Y calibration: H1:TCS-ETMY_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• Absorption: H1:TCS-ETMX_SIM_SURF_ABSORPTION = 250E-9
• Absorption: H1:TCS-ETMY_SIM_SURF_ABSORPTION = 250E-9
• Surface defocus:
  • ETMX ROC nominal: H1:TCS-ETMX_SIM_SURF_ROC_NOM = 2241.54m (see galaxy website ETM serial number 08)
  • ETMY ROC nominal: H1:TCS-ETMY_SIM_SURF_ROC_NOM = 2238.9m (see galaxy website ETM serial number 12)
  • ETMX/ETMY self absorption transfer function (derived from a COMSOL model and fitted to double-exponential in MATLAB):
    • poles = [1.033E-4, 7.5E-4],
    • zeros = [1.8511E-4],
    • steady state gain, H1:TCS-ETMX_SIM_SURF_DEFOCUS_SELF_GAIN = -2.931E-5 diopters per Watt (-ve sign comes from the fact that self-absorption makes the surface flatter, or ROC longer)
  • ETMX/ETMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ETMX/ETMY ring heater transfer function (fitted from COMSOL - surfTFRH):
    • poles = [2.0693E-5, 2.4992E-5]
    • zeros = [8.8689E-6]
  • • steady-state gain: H1:TCS-ETMX_SIM_SURF_DEFOCUS_RH_GAIN = +1.06626E-6 diopters per Watt (+ve sign comes from the fact that RH makes optic surface more curved), derived from Figure 4 in T1200465
• Substrate defocus:
  • ETMX/ETMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ETMX/ETMY ring heater thermal lens (single-pass): fitted to LLO measurements
    • poles: [3.908E-5, 6.385E-6]
    • zeros: [2.6983E-6]
    • steady-state gain: H1:TCS-ETMX_SIM_SUB_DEFOCUS_RH_GAIN = -9.0E-6 diopters per Watt (RH cause a -ve lens in the substrate)
  • ETMX/ETMY self-heating thermal lens: from COMSOL
    • poles: [4.1996E-4, 7.0555E-5]
    • zeros: [1.1155E-4]
    • steady-state gain: H1:TCS-ETMX_SIM_SUB_DEFOCUS_SELF_GAIN = +3.8577E-4 diopters per Watt (self heating lens is +ve in the substrate)