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Modeling the Input Optics with e2e

Modeling the Input Optics with e2e. T. Findley, S. Yoshida, D. Dubois, N. Jamal, and R. Dodda Southeastern Louisiana University. LIGO-G050219-00-D. Objectives. Report status of e2e modeling Results Calibrated floor motion Better Mode Cleaner Mode Matching Telescope in Detector.box

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Modeling the Input Optics with e2e

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  1. Modeling the Input Optics with e2e T. Findley, S. Yoshida, D. Dubois, N. Jamal, and R. Dodda Southeastern Louisiana University LIGO-G050219-00-D

  2. Objectives • Report status of e2e modeling • Results • Calibrated floor motion • Better Mode Cleaner • Mode Matching Telescope in Detector.box • Comments/Suggestions

  3. Contents • Estimate the table top motion for a given ground motion. • Make a Small Optic Suspension (SOS) box with local damping, and find optimal gain settings to damp the optic when estimated table top motion is given. • Create a Mode Cleaner (MC) box, and implement the length control for the mode cleaner cavity. • Put all the optics (MCs, SM, and MMTs) in order, and create the Input Optic (IO) box. • Use the IO box in Simligo, and run the simulation for the entire detector.

  4. Input Optics

  5. Suspension Point Tower Wire OSEM Sensors HAM table Vibration isolation stacks Accelerometer òò = x ( t ) ACCX dt dt Table Motion

  6. Calibrating the Table Motion MC1 box HAM box

  7. ITMX pend/yaw with balanced OSEMs Pendular Yaw

  8. UR= (P + Y + T) g1 UL UR UL= (P - Y + T) g2 LL= (P - Y - T) g3 LL LR LR= (P + Y - T) g4 OSEM sensor imbalance OSEM P = UR+UL+LL+LR = (P+Y+T)g1 + (P-Y+T) g2 + (P-Y-T) g3 + (P +Y-T) g4 =(g1+g2+g3+g4)P + (g1-g2-g3+g4)Y + (g1+g2-g3-g4)T = 0, if g1=g2=g3=g4 If g1=1.05, g2=g3=g4=0.95 OSEM Y = UR–UL–LL+LR = 0.1P+3.9Y+0.1T

  9. ITMX pend/yaw with pend/yaw ratio = 0.023 Pendular Yaw

  10. Mode Cleaner

  11. Mode Cleaner Continued

  12. MC Transmission and MC2 motion

  13. DAQ E2E MC Transmitted Power Frequency Domain Time Domain

  14. MC Beam Motion Time Domain Frequency Domain yaw pitch Beam center 20 meters away from MC pitch (lower)

  15. Detector box

  16. Status of IO box: Contains MMT optics only

  17. MMT1 motion effect on CARM and DARM error signals Displacement (m or rad) Time (sec) Time (sec)

  18. Displacement (m or rad) Time (sec) MMT3 motion effect on CARM and DARM Time (sec)

  19. Power Behind ETMx due to MMT1 and MMT3 motion

  20. Power Behind ETMx due to MMT optics motion

  21. Summary • Produced a better representation of the table translational and yaw motion • Created a Mode Cleaner box with Length Sensing Control • Put the Mode Matching Telescope into Detector box • Will continue investigating the effect of table motion on the optic and the resultant beam motion • Will include Mode Cleaner box in Detector box

  22. Acknowledgements • People: • B. Bhawal • M. Evans • H. Yamamoto • Organizations • LIGO Livingston Observatory • National Science Foundation • Southeastern Louisiana University

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