Modeling the Input Optics using E2E

1
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

2
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.

3
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.

4
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
5
Calculating tables Yaw
X in
Table u
HAM stack box
Table v
Y in
6
Dependence of k on frequency
7
Calculating the suspension point motions of the
optics
u(x,y) U - yq v(x,y) V xq
U tables center of mass translational motion V
tables center of mass translational motion q
tables yaw motion
8
MC2 and MC3
9
MC1 pendular motion with local damping
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Mode Cleaner box Preliminary Results
11
IO box with the full Detector box
12
Conclusions

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