Holometer Holometer results and status in correlating twin 40m - - PowerPoint PPT Presentation

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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

Holometer Collaboration Holometer Collaboration

Fermi National Accelerator Laboratory Aaron Chou (co-PI, project manager) Craig Hogan (Project Scientist) Hank Glass Chris Stoughton Ray T

• mlin

University of Chicago Brittany Kamai Bobby Lanza Lee McCuller Stephan Meyer (co-PI) Jonathan Richardson MIT Rainer Weiss University of Michigan

• H. Richard Gustafson

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Interferometers at Fermilab Interferometers at Fermilab

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Interferometers at Fermilab Interferometers at Fermilab

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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)

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Interferometer Sensitivity Interferometer Sensitivity

λ=1064nm

Interference Readout

Photodiode

Laser

Each Photon gives 1064nm/2π measurement minimum measurable length variance from counting photons ~10^19 photons/s in 1 Watt

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Power Recycling Power Recycling

λ=1064nm

200 mW 2 kW 1 Watt

Interference Readout

Photodiode

Laser

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Cross Correlation Cross Correlation

λ=1064nm Photodiode

Laser

200 mW 2 kW 1 Watt

Photodiode

Laser

Measures length covariation

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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

• Vacuum systems
• Control electronics
• Readout electronics
• Lasers
• GPS synchronization

(separate antennas)

do share

• AC-power mains at Fermilab
• Space-time

Experimental Layout Experimental Layout

Vacuum tubes inside old meson beamline tunnel (MP8) Half outside to hut

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Inside the tunnel View outside the tunnel

2009 - 2010 2009 - 2010

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Assembly of vacuum system Vacuum tubes

Summer 2011

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Inside the tunnel after construction

Today

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Controls Station Controls Station

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Gravity Waves Gravity Waves

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Cross Correlation Strain Cross Correlation Strain

Cross Correlation Strain Cross Correlation Strain

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Displacements Entangled In Beam Displacements Entangled In Beam

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Displacements Entangled In Beam Displacements Entangled In Beam

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Geometric Displacement Noise Geometric Displacement Noise

Transverse positions become more uncertain at larger separations L: Planck-length magnified through diffraction over L Avoids general impracticality of unification-scale experiments

McCuller June 2015

Diffraction of Displacement Data Diffraction of Displacement Data

Transverse positions become more uncertain at larger separations L:

arXiv:1410.8197

McCuller June 2015

Diffraction on Displacement Data Diffraction on Displacement Data

Transverse positions become more uncertain at larger separations L:

arXiv:1410.8197

Integrating Further Integrating Further

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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

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Thanks Thanks

The Holometer is made possible with excellent support from Fermilab facilities.

• Accelerator Division
• Particle Physics Division
• Computing Division
• Vacuum Support

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RF Correlator RF Correlator

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RF Correlator RF Correlator Real-time view Real-time view