Modeling the Input Optics using E2E. S. Yoshida, R. Dodda, T. Findley, K.Rogillio, and N. Jamal, Southeastern Louisiana University – Acknowledgement – LIGO Livingston Observatory, SURF 2004, NSF B. Bhawal, M. Evans, V. Sannibale, and H. Yamamoto. Objectives.
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S. Yoshida, R. Dodda, T. Findley, K.Rogillio, and N. Jamal,
Southeastern Louisiana University
– Acknowledgement –
LIGO Livingston Observatory, SURF 2004, NSF
B. Bhawal, M. Evans, V. Sannibale, and H. Yamamoto
LIGO Laboratory
A simulation model will be very convenient to study the impact of ground motion on the input optics, and on the input beam.
Therefore, we seek to do the following:
1. Build an IO box using E2E.
2. Integrate it with the Simligo.
3. Run simulation with realistic ground motion.
LIGO Laboratory
1. Make an Small Optic Suspension (SOS) box, and validate it.
2. Use the SOS box to damp the motion of an optic when realistic ground motion is given.
3. Create a Mode Cleaner (MC) box, and try to lock the cavity when realistic ground motion is given to the Mode Cleaner optics.
4. Put all the optics ( MCs, SM, and MMTs ) in order, and create the Input Optic (IO) box.
5. Use the IO box in Simligo, and run the simulation for the entire detector.
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MC1 Yaw motion using two different schemes
Schematic diagram of the SOS box
with HAM motion as input
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ACCX
dt
dt
HAM table
Vibration
isolation
stacks
u
v
¶
¶
1
1

=

Table yaw =
(
)
{
ik
u
(
y
,
t
)
ik
v
(
x
,
t
)}
1
2
Accelerometer
¶
¶
2
y
x
2
w
±
w
±
(
)
(
)
i
t
k
y
i
t
k
x
=
=
u
(
y
,
t
)
A
e
,
v
(
x
,
t
)
A
e
1
1
2
2
0
0
=
=
w
q
=
w

k
k
k
(
)
i
k
(
){
u
(
y
,
t
)
v
(
x
,
t
)}
1
2
Calculating table’s YawX in
Table u
HAM stack box
Table v
Y in
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(0.75, 0.45)
V
MMT1
(0.1, 0.4)
MC3
(0.75, 0.05)
U
(0, 0)
q
MMT3
(0.8, 0.6)
MC1
(0.75, 0.25)
Calculating the suspension point motions of the opticsu(x,y)= U  yq
v(x,y)= V + xq
U: table’s center of mass translational motion
V: table’s center of mass translational motion
q: table’s yaw motion
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