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).
- IM OSEMs
- Coil resistance (at coil and/or at rack).
- Cable length(s).
Enzo's Section
Here we will clarify the steps to follow to complete the characterization of the Type B suspensions:
SR3
Task |
August 27-31 |
September 3-7 |
September 10-13 |
September 14 |
Reference |
Comments |
IM Local damping |
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GAS Local damping |
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TM Local damping |
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IM-TM Hierarchical damping |
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IP Blending filter |
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IP Local damping |
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IM Diagonalization |
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IP Diagonalization |
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