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SEI Structure Development

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Optical instability on ASC. M3 alignment control through M2. WFS signals (not connected) ... Frequency response for ASC optical spring. WFS signal in control loop ... – PowerPoint PPT presentation

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Title: SEI Structure Development


1
Time domain simulation forFP cavity with AdLIGO
parameters on E2E
Osamu Miyakawa, Hiroaki Yamamoto 06/28/2006
Advanced LIGO meeting
  • Is it possible to control alignment with
    radiation pressure?
  • Optical spring in ASC?
  • Do we need test mass actuator for ASC? both ETM
    and ITM?
  • Is the actuator dynamic range enough?
  • Noise performance?

2
What implemented
  • AdLIGO Quad suspension (Marks model 03/31/2006)
  • Seismic motion on X, tY and tZ (length, pitch and
    yaw)
  • Local damping (6, 3, 3 DOFs)
  • Length control for M3 through M1, M2, M3
  • Radiation pressure on length and alignment
  • Optical instability on ASC
  • M3 alignment control through M2
  • WFS signals (not connected)

Main
Ref.
M0
M1
M2
M3
Z
X
Y
3
Quad suspensionwith radiation pressure (length)
Control
Control
4
Local damping
Example M0 pitch
Main
Ref.
Num. of DOF
6
M0
3
M1
M2
3
0
M3
Zero _at_ 0Hz Pole _at_ 10,10Hz
5
Optical instability in alignment
6
Test mass alignment control with radiation
pressure
ITM
ETM
ASC Control
ASC Control
Radiation pressure
Control BW 10Hz
7
Test mass alignment control with radiation
pressure
Test mass(M3) alignment can be controlled by
feedback to M2.
8
Next step
  • Frequency response for ASC optical spring
  • WFS signal in control loop
  • Dynamic range limit of OSEM for ASC
  • Noise model
  • Miss-centering
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