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Radio Frequency Noise Reduction in the LIGO Hanford Observatory Matthew Withers 2019 Caltech SURF Program Mentors: Dick Gustafson and Keita Kawabe LIGO-G18xxxxx-v1 LIGO-T1900364-v5 Form F0900043-v2 Overview RF Distribution System Overview


  1. Radio Frequency Noise Reduction in the LIGO Hanford Observatory Matthew Withers 2019 Caltech SURF Program Mentors: Dick Gustafson and Keita Kawabe LIGO-G18xxxxx-v1 LIGO-T1900364-v5 Form F0900043-v2

  2. Overview RF Distribution System Overview Investigation: Mapping RF Cable Noise to DARM » Intro to RF Cable Shield Noise » Mapping Methodology » Experiment #1: Cable Characterization » Experiment #2: RF Noise Injections » Experiment #3: Cable Noise Profile Collection Further Improvements » Adjusting Mapping Equation for Non-Flat Transfer Function Future Work LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 2 Form F0900043-v2

  3. RF Distribution System Overview RF Signal Generation for Servo Control Loop PSL = Pre-Stabilized Laser EOM = Electro Optic Modulator PRM = Power Recycling Mirror SRM = Signal Recycling Mirror ITMX = Input Test Mass X ETMX = End Test Mass X ITMY = Input Test Mass Y ETMY = End Test Mass Y LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 3 Form F0900043-v2

  4. Mapping Cable Noise to DARM Shield Noise Overview » Shield Noise = Any unwanted RF signal ( V shield ) on the shield of a transmission cable LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 4 Form F0900043-v2

  5. Mapping Cable Noise to DARM Measuring and Exciting Shield Noise LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 5 Form F0900043-v2

  6. Mapping Cable Noise to DARM Sample Shield Noise Profile LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 6 Form F0900043-v2

  7. Mapping Cable Noise to DARM DARM Response of March 2019 RF Signal Injection Injection Line (55 Hz) LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 7 Form F0900043-v2

  8. Mapping Cable Noise to DARM Mapping Methodology: Experiment #1: Cable Characterization Experiment #2: RF Noise Injection Experiment #3: RF Noise Profile Collection LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 8 Form F0900043-v2

  9. Mapping Cable Noise to DARM Experiment #1: Cable Characterization - Setup LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 9 Form F0900043-v2

  10. Mapping Cable Noise to DARM Experiment #1: Cable Characterization - Results LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 10 Form F0900043-v2

  11. Mapping Cable Noise to DARM Mapping Methodology: Experiment #1: Cable Characterization Experiment #2: RF Noise Injection Experiment #3: RF Noise Profile Collection LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 11 Form F0900043-v2

  12. Mapping Cable Noise to DARM Experiment #2: Noise Injections - Setup LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 12 Form F0900043-v2

  13. Mapping Cable Noise to DARM Experiment #2: Noise Injections - Results Injection Line (50 Hz) LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 13 Form F0900043-v2

  14. Mapping Cable Noise to DARM Experiment #2: Noise Injections - Results LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 14 Form F0900043-v2

  15. Mapping Cable Noise to DARM Mapping Methodology: Experiment #1: Cable Characterization Experiment #2: RF Noise Injection Experiment #3: RF Noise Profile Collection LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 15 Form F0900043-v2

  16. Mapping Cable Noise to DARM Experiment #3: RF Noise Profile Collection - Setup LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 16 Form F0900043-v2

  17. Mapping Cable Noise to DARM Experiment #3: RF Noise Profile Collection – Data Prep LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 17 Form F0900043-v2

  18. Mapping Cable Noise to DARM Experiment #3: RF Noise Profile Collection – Data Prep LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 18 Form F0900043-v2

  19. Mapping Cable Noise to DARM Experiment #3: RF Noise Profile Collection – Data Prep LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 19 Form F0900043-v2

  20. Mapping Cable Noise to DARM Experiment #3: RF Noise Profile Collection - Results LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 20 Form F0900043-v2

  21. Mapping Cable Noise to DARM Experiment #1: Cable Characterization Experiment #2: RF Noise Injection Experiment #3: RF Noise Profile Collection LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 21 Form F0900043-v2

  22. Mapping Cable Noise to DARM Final Results: 9.10023 MHz Main Modulation Cable LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 22 Form F0900043-v2

  23. Mapping Cable Noise to DARM Final Results: Other Cables LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 23 Form F0900043-v2

  24. Further Improvements Original Equation Assumes Flat Transfer Function between Cable Noise and DARM Noise LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 24 Form F0900043-v2

  25. Further Improvements Recently Acquired Data Suggests a Non-Flat Transfer Function -> Try 1-pole Transfer Function LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 25 Form F0900043-v2

  26. Further Improvements Mapping Equation with Single Pole Transfer Function LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 26 Form F0900043-v2

  27. Future Work Perform more injections across the aLIGO DARM frequency band to verify our choice of a 1-pole transfer function » Improve fit values or select new transfer function template as necessary Use new mapping equation to model noise on 45.50115 MHz and 79.4 MHz cables LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 27 Form F0900043-v2

  28. Acknowledgements Special Thanks Goes to the Following Individuals for their Contributions to the Project » Mentors: Dick Gustafson and Keita Kawabe » EE Lab Staff: Marc Pirello and Filiberto Clara » National Science Foundation and the Caltech SURF Program LIGO-G18xxxxx-v1 LIGO-T1900364-v5 LIGO Laboratory 28 Form F0900043-v2

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