• KAGRA
• Subgroups
• VIS
• TypeB
• Characterization

Type B Characterization Tasks

Mark's Section

Info we need to know/measure/document LIGO-T1100378.

Generic info (OK to analyze or measure one typical item)

• DAC:
  • Counts to voltage response (with extreme care about single-ended vs. double ended signals).
  • Frequency response.
• HPCD:
  • Internal output resistance.
  • Output noise.
  • Input voltage to output voltage response with open-circuit load.
  • Input voltage to output current response with typical coil load.
  • Voltage monitor calibration.
  • Fast current monitor calibration.
  • Slow current monitor calibration and frequency response.
  • Frequency response of each filter.
  • Which filters are engaged for which RTM states (really a property of the RTM).
  • Effect of inductive load.
• Modified LPCD:
  • Internal output resistance.
  • Output noise.
  • Input voltage to output voltage response with open-circuit load.
  • Input voltage to output current response with typical coil load.
  • Voltage monitor output calibration.
  • Fast current monitor calibration.
  • Slow current monitor calibration and frequency response.
  • Frequency response of each filter.
  • Which filters are engaged for which RTM states (really a property of the RTM).
  • Effect of inductive load.
• Regular LPCD:
  • Internal output resistance.
  • Output noise.
  • Input voltage to output voltage response with open-circuit load.
  • Input voltage to output current response with typical coil load.
  • Voltage monitor output calibration.
  • Fast current monitor calibration.
  • Slow current monitor calibration and frequency response.
  • Frequency response of each filter.
  • Which filters are engaged for which RTM states (really a property of the RTM).
  • Effect of inductive load.
• ADC
  • Voltage to counts response (with extreme care about single-ended vs. double ended signals).
  • Frequency response.
• Magnets
  • BS TM OSEM size/material/count
  • SR TM OSEM size/material/count
  • BS/SR IM OSEM size/material/count
  • BF GAS LVDT size/material/count
  • SF GAS LVDT size/material/count
  • BS F0 GAS LVDT size/material/count
  • SR F0 GAS LVDT size/material/count
  • BS IP LVDT size/material/count
  • SR IP LVDT size/material/count
• Coils
  • BS TM OSEM ID/OD/length/turns
  • SR TM OSEM ID/OD/length/turns
  • BS/SR IM OSEM ID/OD/length/turns
  • BF GAS LVDT ID/OD/length/turns
  • SF GAS LVDT ID/OD/length/turns
  • BS F0 GAS LVDT ID/OD/length/turns
  • SR F0 GAS LVDT ID/OD/length/turns
  • BS IP LVDT ID/OD/length/turns
  • SR IP LVDT ID/OD/length/turns

• Coil/magnet combinations (some already in JGW-T1503239)

  • BS TM OSEM current to force
  • SR TM OSEM current to force
  • BS/SR IM OSEM current to force
  • BF GAS LVDT current to force
  • SF GAS LVDT current to force
  • BS F0 GAS LVDT current to force
  • SR F0 GAS LVDT current to force
  • BS IP LVDT current to force
  • SR IP LVDT current to force
• Fishing rods (BF GAS, SF GAS, F0 GAS, IP)
  • Stepper motor types.
  • Stepper driver type.
  • Stepper motor steps per revolution.
  • Software steps per stepper motor step.
  • Screw pitch.
  • Spring constant.
• Picos (IM_P, IM_R, IM_Y, BF_1, BF_2)
  • Pico type.
  • Pico driver type.
  • Steps per revolution.

Device-specific info

• TM OSEMs
  • Coil resistance (at coil and/or at rack).
  • Cable length(s).
  • Sign of actuation response (without COILOUTF correction).
• IM OSEMs
  • Coil resistance (at coil and/or at rack).
  • PD forward voltage (at coil and/or at rack).
  • LED forward voltage (at coil and/or at rack).
  • Cable length(s).
  • Sign of actuation response (without COILOUTF correction).
• Fishing rods (BF GAS, SF GAS, F0 GAS, IP)
  • Counts to motion response (sign and magnitude).
• Picos (IM_P, IM_R, IM_Y, BF_1, BF_2)
  • Counts to motion response (sign and magnitude).
• LVDT sensing (BF GAS, SF GAS, F0 GAS, IP)
  • Motion to counts response (sign and magnitude).
• LVDT actuation (BF GAS, SF GAS, F0 GAS, IP)
  • Counts to motion response (sign and magnitude).

Enzo's Section

Here we will clarify the steps to follow to complete the characterization of the Type B suspensions:

SR3