KAGRA VIS Operations Manual - SR2 Suspension Reference
Cut and Pasted from BS - Needs Checking!!!
IP Optimum Position
(Updated for SR2) See klog 7814, 8160.
- IP L: -36 µm.
- IP T: -25 µm.
- IP Y: +4270 µrad.
Stepper Motor Info
Type |
Manufacturer |
Model |
Color code (A1/A2//B1/B2) |
Coil Ω @Motor |
Coil Ω @Connector |
@Flange |
GAS Vertical |
Arun Microelectronics (AML) |
D42.2-HX |
green/grey//black/white |
5.5Ω |
7.1Ω |
9.4Ω |
PI Yaw |
Phytron |
VSS 25.200.0.6 |
yellow/red//blue/green |
5.2Ω |
|
|
PI Horizontal |
?? |
?? |
|
7Ω |
|
|
(Updated for SR2)
Stepper |
Controller |
Channel |
Effect of "Left" Cmd |
BF GAS |
0 |
Keystone Up |
|
SF GAS |
1 |
Keystone Up |
|
F0 GAS |
2 |
Keystone Up |
|
IP H1 |
0 |
IP Clockwise |
|
IP H2 |
1 |
IP Clockwise |
|
IP H3 |
2 |
IP Clockwise |
|
F0 Y |
3 |
SF/... Clockwise |
Pico Info
(Updated for SR2)
Pico |
Controller |
Channel |
Colors |
Effect of "+" Cmd |
IM_PIT |
10.68.150.24=SR2_IM |
1 |
red/white |
joystick UP = HR beam down, positive pitch; klog 6137 |
IM_ROL |
10.68.150.24=SR2_IM |
2 |
red/white |
joystick UP = HR beam left, positive roll; klog 6137 |
IM_YAW |
10.68.150.24=SR2_IM |
3 |
red/white |
joystick UP = IM clockwise, negative yaw; klog 6137 |
BF_1 |
10.68.150.25=SR2_BF |
1 |
red/white |
|
BF_2 |
10.68.150.25=SR2_BF |
2 |
red/white |
|
LVDT Info
LVDT Coil Info
Measured
Type |
Primary/Single/IN/1-6 |
Secondary/Double/OUT/2-7 |
Actuation/ACT/3-8 |
Reference |
GAS Vertical |
117.4 Ω |
??75.4, 102.5 Ω |
214.0 Ω |
2018-06-26 |
PI Horizontal 1/3 |
56.6 Ω |
118.4 Ω |
131.2 Ω |
2018-06-28 |
PI Horizontal 2/3 |
55.5 Ω |
121.5 Ω |
129.6 Ω |
2018-06-28 |
PI Horizontal 3/3 |
55.4 Ω |
122.9 Ω |
129.8 Ω |
2018-06-28 |
LVDT Coil Info SEPTEMBER
Measured
Type |
Primary/Single/IN/1-6 |
Secondary/Double/OUT/2-7 |
Actuation/ACT/3-8 |
Reference |
PI Horizontal 1/3 |
130.3 Ω |
62.6 Ω |
137.2 Ω |
2018-09-03 |
PI Horizontal 2/3 |
125.9 Ω |
63.7 Ω |
138.2 Ω |
2018-09-03 |
PI Horizontal 3/3 |
129.1 Ω |
62.8 Ω |
136.9 Ω |
2018-09-03 |
LVDT Driver Data
LVDT Driver S.N. |
Left card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
Right card |
Stage |
Resistor value [ohm] |
Reference Signal |
Gain |
SR2: SN 7777777 |
R0 |
BF GAS |
59.2 |
4. Vpp |
4./5.02 = 0. |
R0 |
PI LVDT#1 |
50.1 |
4. Vpp |
4./5.02 = 0. |
R1 |
SF GAS |
36.3 |
4. Vpp |
4./5.02 = 0. |
R1 |
PI LVDT#2 |
50.6 |
4. Vpp |
4./5.02 = 0. |
|
R2 |
F0 GAS |
59.6 |
4. Vpp |
4./5.02 = 0. |
R2 |
PI LVDT#3 |
51.2 |
4. Vpp |
4./5.02 = 0. |
|
R3 |
Not used |
59.5 |
4. Vpp |
4./5.02 = 0. |
R3 |
Not used |
50.0 |
4. Vpp |
4./5.02 = 0. |
LVDT Calibration Info
Actual SR2 Data (not BS).
LVDT |
Slope (cts/µm) |
Gain (µm/ct |
Nominal (cts) |
BF GAS |
6.262 |
0.1600 |
-3425 |
SF GAS |
- |
- |
- |
PI GAS |
- |
- |
- |
PI H0 |
- |
- |
- |
BF H1 |
- |
- |
- |
OSEM Info
Location |
LED V |
PD V |
Coil Ω |
Coil Ω @Type 5 |
Coil Ω @SatAmp |
Coil Ω @Rack |
Notes |
TM Nom |
- |
- |
11.3 |
14.8 |
|
|
|
H1 |
- |
- |
- |
- |
20.8 |
26.5 |
klog 6182, 6255 |
H2 |
- |
- |
- |
- |
22.5 |
28.3 |
klog 6182, 6255 |
H3 |
- |
- |
- |
- |
24.9 |
30.7 |
klog 6182, 6255 |
H4 |
- |
- |
- |
- |
21.1 |
26.5 |
klog 6182, 6255 |
IM |
1.051 |
0.47 |
11.3 |
14.8 |
|
|
|
Magnet Info
Location |
Size (mm) |
Number |
Material |
BS (Old) |
3xØ6 |
4 |
NdFeB |
BS (New) |
3xØ2 |
4 |
|
IM |
10xØ10 |
2x6 |
NdFeB?? |
SR Damper |
10x10x12 |
72 |
NdFeB?? |
LBB Damper |
10x10x12 |
48 |
NdFeB?? |
Filter Info
Stage |
f (Hz) |
klog |
m (kg) |
klog |
k (N/m) |
klog |
kFR (N/m) |
klog |
F0 |
0.5025 |
5688 |
252.8 |
4371 |
|
|
|
|
SF |
0.27 (cap off); 0.235 (poor cap) |
4405;4401, |
162.9+0.8=163.7 |
4266 |
|
|
|
|
BF |
0.461 |
4401 |
53.1-1.048=52.1 |
3971, 4002 |
|
|
|
|
GAS filters suitable positions
Filter |
LVDT readout (µm) |
klog |
Notes |
F0 |
-1100 |
|
|
F1 |
0 |
|
|
BF |
0 |
|
We require the IM-V OSEM flags to be at the correct position. |
Optimum Temperature
See klog 7420.