1 / 17

Surface Wave Propagation Preliminary work developing a method for surface wave detection

Surface Wave Propagation Preliminary work developing a method for surface wave detection. Amy Zheng Andrew Johnanneson. Ultrahigh Energy Neutrino Detection. Particles with velocity > will emit radiation due to the Askaryan effect [1]

gabby
Download Presentation

Surface Wave Propagation Preliminary work developing a method for surface wave detection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Surface Wave Propagation Preliminary work developing a method for surface wave detection Amy Zheng Andrew Johnanneson

  2. Ultrahigh Energy Neutrino Detection • Particles with velocity > will emit radiation due to the Askaryan effect [1] • Detection is difficult due to internally reflected waves dying off quickly[2]

  3. Surface Waves as an Detection Tool • Radiation from Askaryan cascade is trapped in Air-dielectric layer between ice and firn[2] • In tandem with existing experiments RICE [3] and ANITA [4]

  4. Why Use Surface Waves? • Surface waves travel between two mediums[5] • Amplitudes fall at the rate • Attenuation length times > bulk waves • ~800 times more efficient than bulk waves • If detection is viable, expanding existing experiments would be far less expensive • Surface waves may carry information about neutrinos and their interactions with ice better than the current method

  5. Procedure • 1 sending + 2 receiving antennas displayed waveshape • Physically moved antennas to determine wavelength and thus index of refraction

  6. Example Antenna Placements • “Air” • “Surface” • “In”

  7. Translating to refractive index (1) Definition of Refractive Index (2) Sellmeier Equation

  8. Refractive Index of Air Single or Half λ λ (cm) Calculated (2) 1000MHz & 1500MHz n=1.000273[6]

  9. Refractive Index of Water (rms) Single or Half λ λ (cm) Calculated (2) n~1.3333[7]

  10. Refractive Index of NaCl (rms) Single or Half λ λ (cm) Calculated (2) n~1.544[8]

  11. Refractive Index of Granulated Fused Silica (sand) Single or Half λ λ (cm) Calculated (2)1000MHz n= 1.73251 [9] Calculated (2) 1500MHz n= 1.73317

  12. Refractive Index of Granulated Fused Silica (sand) Multiple λ λ (cm) Calculated (2) 1000MHz n= 1.73251 [9] Calculated (2) 1500MHz n= 1.73317

  13. Measurement Complications • Mechanical water waves appeared to alter EM waveform • Imprecise measurements due to hand & eye observation • Sand and water tend to collect in the connectors • Angular error from planar disparity • Waveforms disappeared & reappeared on and off • Waveforms constantly shift amplitude • Background EM noise & reflections often interfered

  14. Future Steps • Experiment using ice as a medium • Change antenna size; more precision • Change experimental scale

  15. References • [1] G.A. Askaryan, Sov. Phys. JETP 14, 441 (1961) • [2]J.P. Ralston, Phys. Rev. D 71, 011503 (2005) • [3] RICE Collaboration, I. Kravchenkoet al., Astropart. Phys. 19, 15 (2003); S. Razzaque, Sseunarine, D.Z. Besson, D.W. McKay, J.P. Ralston, and D. Seckel, Phys. Rev. D 65, 103002 (2002); Phys. Rev. D 69, 047101 (2004). • [4] For information on ANITA, see http://www.phys.hawaii.edu/anita/. • [5] J. P. Ralston “An Experiment to Detect Surface Waves on Polar Ice” (2005) • [6] Philip E. Ciddor. Refractive index of air: new equations for the visible and near infrared, Appl. Optics 35, 1566-1573 (1996) doi:10.1364/AO.35.001566 • [7]P. Schiebener, J. Straub, J.M.H. LeveltSengers and J.S. Gallagher, J. Phys. Chem. Ref. Data 19, 677, (1990) • [8] Faughn, Jerry S., Raymond A. Serway. College Physics, 6th Edition. Toronto: Brooks/Cole, 2003: 692. • [9] I. H. Malitson. Interspecimen Comparison of the Refractive Index of Fused Silica, J. Opt. Soc. Am. 55, 1205-1208 (1965) doi:10.1364/JOSA.55.001205 • [misc] Colloquium Notes from John P. Ralston • Refractive index calculations for relative reference only: • n found for granulated fused silica was found using Sellmeier constants for solid fused silica; granulation affects density. • Calculated n for water is for λ of 589.29 nm • Calculated n for NaCl is for λ of 589 nm

  16. Acknowledgements • Dave Besson • Marie Piasecki • Carolyn Bandle

  17. Any Questions?

More Related