Modeling the Input Optics using E2E

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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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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

LIGO Laboratory

Objectives

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

The Process

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.

LIGO Laboratory

Validating SOS – Role of the Table Top motion

MC1 Yaw motion using two different schemes

Schematic diagram of the SOS box

with HAM motion as input

LIGO Laboratory

òò

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 Yaw

X in

Table u

HAM stack box

Table v

Y in

LIGO Laboratory

SM

(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 optics

u(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

LIGO Laboratory

MC2 and MC3

LIGO Laboratory

Conclusions
• HAM table motion estimated from the ACC[XY] DAQ signal
• MC1, MC3 local damping optimized
• MC box constructed and being tested
• Combination of MC and IFO in progress

LIGO Laboratory