1 / 9

Scientific opportunities with intense polarized neutrons

Scientific opportunities with intense polarized neutrons. Collin Broholm Department of Physics and Astronomy, Johns Hopkins University. Lawes et al (2005). Zhoue et al (2004). Lösche et al. (2005). Hong et al. (2006). Unpolarized neutron scattering. Small Angle Neutron Scattering.

africa
Download Presentation

Scientific opportunities with intense polarized neutrons

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. Scientific opportunities with intense polarized neutrons Collin Broholm Department of Physics and Astronomy, Johns Hopkins University

  2. Lawes et al (2005) Zhoue et al (2004) Lösche et al. (2005) Hong et al. (2006) Unpolarized neutron scattering Small Angle Neutron Scattering Magnetic Neutron Diffraction Neutron POUT Q=PIN-Pout Neutron PIN Neutron Reflectometry Inelastic Magnetic Neutron Scattering NCNR Expansion workshop

  3. Mook et al (1993) Intensity Spin resolved scattering Small Angle Neutron Scattering Magnetic Neutron Diffraction Neutron POUT Akimitsu et al (2001) Gentile et al (2000) Q=PIN-Pout Neutron PIN Neutron Reflectometry Inelastic Magnetic Neutron Scattering NCNR Expansion workshop Hauet et al (2005)

  4. Polarized beams can be “Larmor labeled” • Conventional scattering experiments: • Spin polarization enables tracking of changes in speed and/or direction through spin echo • NSE: 0.1 ns to 0.1 ms dynamics • SESANS: 0.1 mm to 0.1 mm structure • SERGIS: Lateral surface structure high resolution OR high intensity high resolution AND high intensity Pynn et al. (2002) NCNR Expansion workshop

  5. Polarized neutron flux limitations 100 K 300 K MITSUDA S, SHIRANE G, SINHA SK, et al. PRL JUL 1 1987 NCNR Expansion workshop

  6. Recent polarizing advances: • Polarizing neutron guides • Broad band RF spin flippers • Wide angle 3He polarization filters • Larmor labeling techniques • Precession in magnetized thin films Polarized neutrons could develop into a valuable tool for nano-scale materials science NCNR Expansion workshop

  7. Quasi-particle lifetime in solids Bayrakci et al., Science (2006) NCNR Expansion workshop

  8. Quasi-particle polarization Brown, P.J. (2001) Blackburn et al. (2005) UO2 FCC 3-k magnetic order NCNR Expansion workshop Ikushima et al (2001)

  9. A NIST Polarized Neutron Source • A source optimized for polarized neutron experiments • Polarizing beam splitter separates neutrons in “up” and “down” guides • A guide hall with minimal stray fields • Effective focusing beam optics on individual instruments Could realize the recognized scientific potential of spin resolved neutron scattering NCNR Expansion workshop

More Related