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Holometer Holometer results and status in correlating twin 40m interferometers results and status in correlating twin 40m interferometers Lee McCuller University of Chicago June 2015 McCuller June 2015 1 Holometer Collaboration Holometer

  1. Holometer Holometer results and status in correlating twin 40m interferometers results and status in correlating twin 40m interferometers Lee McCuller University of Chicago June 2015 McCuller June 2015 1

  2. Holometer Collaboration Holometer Collaboration Fermi National Accelerator Laboratory Aaron Chou (co-PI, project manager) Craig Hogan (Project Scientist) Hank Glass Chris Stoughton Ray T omlin University of Chicago Brittany Kamai Bobby Lanza Lee McCuller Stephan Meyer (co-PI) Jonathan Richardson MIT Rainer Weiss University of Michigan H. Richard Gustafson 2

  3. Interferometers at Fermilab Interferometers at Fermilab 3

  4. Interferometers at Fermilab Interferometers at Fermilab 4

  5. Overview Overview ● Design for sensitivity ● Layout on site ● Tests in classical Geometry (RF Gravity Wave Results) ● Tests in Quantum Geometry (Integration for predicted position indeterminacy) McCuller June 2015 5

  6. Interferometer Sensitivity Interferometer Sensitivity Each Photon gives 1064nm/2π measurement minimum measurable length variance from counting photons ~10^19 photons/s in 1 Watt Laser λ=1064nm Interference Readout Photodiode McCuller June 2015 6

  7. Power Recycling Power Recycling 1 Watt 2 kW Laser λ=1064nm Interference 200 mW Readout McCuller June 2015 7 Photodiode

  8. Cross Correlation Cross Correlation Measures length co variation 1 Watt 2 kW Laser Laser λ=1064nm 200 mW Photodiode McCuller June 2015 8 Photodiode

  9. Cross Correlation RF Readout Cross Correlation RF Readout ● Correlation up to 10Mhz (readout up to 50Mhz, 8channels) ● RF electronic pickup is a systematic background The 2 interferometers do not share do share ● Vacuum systems ● AC-power mains at Fermilab ● Control electronics ● Space-time ● Readout electronics ● Lasers ● GPS synchronization (separate antennas) McCuller June 2015 9

  10. Experimental Layout Experimental Layout Vacuum tubes inside old Half outside to hut meson beamline tunnel (MP8)

  11. View outside the tunnel Inside the tunnel 2009 - 2010 2009 - 2010 McCuller June 2015 11

  12. Assembly of vacuum Vacuum tubes system Summer 2011 McCuller June 2015 12

  13. Inside the tunnel after construction Today McCuller June 2015 13

  14. Controls Station Controls Station McCuller June 2015 14

  17. Gravity Waves Gravity Waves McCuller June 2015 17

  18. McCuller June 2015 18

  19. Cross Correlation Strain Cross Correlation Strain

  20. Cross Correlation Strain Cross Correlation Strain

  21. Displacements Entangled In Beam Displacements Entangled In Beam McCuller June 2015 21

  22. Displacements Entangled In Beam Displacements Entangled In Beam McCuller June 2015 22

  23. Geometric Displacement Noise Geometric Displacement Noise Planck-length magnified Transverse positions become more uncertain through diffraction over L at larger separations L: Avoids general impracticality of McCuller June 2015 unification-scale experiments 23

  24. Diffraction of Displacement Data Diffraction of Displacement Data Transverse positions become more uncertain at larger separations L: arXiv:1410.8197 McCuller June 2015

  25. Diffraction on Displacement Data Diffraction on Displacement Data Transverse positions become more uncertain at larger separations L: arXiv:1410.8197 McCuller June 2015

  26. Integrating Further Integrating Further

  27. Status Status ● Cross-checking calibration scheme, statistical analysis and systematics ● Taking data as systematics improve ● RF Gravity wave analysis planned this Summer ● Holographic-noise result and Instrumentation papers planned this Winter McCuller June 2015 27

  28. Thanks Thanks The Holometer is made possible with excellent support from Fermilab facilities. ● Accelerator Division ● Particle Physics Division ● Computing Division ● Vacuum Support McCuller June 2015 28

  29. McCuller June 2015 29

  30. RF Correlator RF Correlator McCuller June 2015 30

  31. RF Correlator RF Correlator Real-time view Real-time view McCuller June 2015 31

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