KAGRA VIS Operations Manual - SR2 Suspension Reference
Cut and Pasted from BS - Needs Checking!!!
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 |
|
|
Stepper |
Controller |
Channel |
Effect of "Left" Cmd |
BF GAS |
0 |
Keystone Up |
|
SF GAS |
1 |
Keystone Up |
|
F0 GAS |
2 |
Keystone Up |
|
PI H0 |
0 |
IP Clockwise |
|
PI H1 |
1 |
IP Clockwise |
|
PI H2 |
2 |
IP Clockwise |
|
PI Yaw |
3 |
SF/... Clockwise |
Pico Info
Pico |
Controller |
Channel |
Colors |
Effect of "+" Cmd |
IM_PIT |
10.68.150.16=BS_IM |
1 |
red/white |
FWD = beam up, negative pitch; 100 steps per µrad |
IM_ROL |
10.68.150.16=BS_IM |
2 |
red/white |
|
IM_YAW |
10.68.150.16=BS_IM |
3 |
red/white |
FWD = IM clockwise, negative yaw; 6 steps per µrad |
BF_1 |
10.68.150.17=BS_BF |
1 |
red/white |
|
BF_2 |
10.68.150.17=BS_BF |
2 |
red/white |
|
LVDT Coil Info
Note: As 2017-05-30, the Primary and Secondary of the PI Horizontal LVDTs are swapped relative to the table.
Type |
Primary/Single/IN/1-6 |
Secondary/Double/OUT/2-7 |
Actuation/ACT/3-8 |
Gain Resistor |
Locked Counts |
Sign |
GAS BF Vertical |
AWG36, 187Ω, 38 mH |
AWG32, 78Ω, 9.5 mH |
AWG32, 110Ω, 74 mH |
165.5Ω |
|
+1 |
GAS SF Vertical |
99.5Ω |
|
+1 |
|||
GAS F0 Vertical |
98.5Ω |
|
+1 |
|||
PI Horizontal |
250 Ω |
320 Ω |
155 Ω |
100Ω |
-1000 |
-1 |
PI Horizontal |
100Ω |
1000 |
+1 |
|||
PI Horizontal |
100Ω |
1000 |
+1 |
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 @Type5+3 |
RM |
- |
- |
11.3 |
14.8 |
|
IRM |
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 |
(.208+.210)/2=0.209 |
3385 |
|
|
|
|
|
|
SF |
0.425 |
3376 |
|
|
|
|
|
|
BF |
(0.443+0.454)/2=0.4485 |
3385 |
|
|
|
|
|
|