KAGRA VIS Operations Manual - SRM Suspension Data Reference
LVDT Info
LVDT Coil Info
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Type |
Primary/Single/IN/1-6 |
Secondary/Double/OUT/2-7 |
Actuation/ACT/3-8 |
GAS Vertical |
AWG36, 187Ω, 38 mH |
AWG32, 78Ω, 9.5 mH |
AWG32, 110Ω, 74 mH |
PI Horizontal |
250 Ω |
320 Ω |
155 Ω |
LVDT Coil Info
LVDT Driver Info
Original box for SRM:
LVDT Driver S.N. |
Left card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
Right card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
SRM: SN 1807786 |
R0 |
BF GAS |
60.6 |
5.04 Vpp |
5.04/5.04 = 1.0 |
R0 |
PI LVDT#1 |
50.0 |
5.0 Vpp |
5.0/5.04 = 0.992 |
R1 |
SF GAS |
60.1 |
4.96 Vpp |
4.96/5.04 = 0.984 |
R1 |
PI LVDT#2 |
50.0 |
4.92 Vpp |
4.92/5.04 = 0.976 |
|
R2 |
F0 GAS |
60.7 |
4.96 Vpp |
4.96/5.04 = 0.984 |
R2 |
PI LVDT#3 |
50.5 |
4. Vpp |
5.0/5.04 = 0.992 |
|
R3 |
Not used |
61.2 |
4.94 Vpp |
4.94/5.04 = 0.98 |
R3 |
Not used |
50.8 |
4. Vpp |
4.9/5.04 = 0.972 |
New box for SRM. Adjusting the potentiometers to have the same values:
LVDT Driver S.N. |
Left card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
Right card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
SRM: SN 1403020 |
R0 |
BF GAS |
60.2 |
- Vpp |
- = - |
R0 |
PI LVDT#1 |
50.4 |
- Vpp |
- = - |
R1 |
SF GAS |
60.1 |
- Vpp |
- = - |
R1 |
PI LVDT#2 |
50.3 |
- Vpp |
- = - |
|
R2 |
F0 GAS |
60.7 |
- Vpp |
- = - |
R2 |
PI LVDT#3 |
50.3 |
- Vpp |
- = - |
|
R3 |
Not used |
61.0 |
- Vpp |
- = - |
R3 |
Not used |
50.2 |
- Vpp |
- = - |
Filter Info
Stage |
f (Hz) |
klog |
m (kg) |
klog |
k (N/m) |
klog |
kFR (N/m) |
klog |
F0 |
0.56 |
6886 |
|
|
|
|
|
|
SF |
0.38 |
6886 |
|
|
|
|
|
|
BF |
0.45 |
6886 |
|
|
|
|
|
|
GAS filters suitable positions
Filter |
LVDT readout (µm) |
klog |
Notes |
F0 |
-1600 |
I couldn't find a klog. I wrote it in the notebook. I'll write a klog. |
|
F1 |
0 |
|
|
BF |
0 |
|
We require the IM-V OSEM flags to be at the correct position. |
Optimum Temperature
See klog 7420.