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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.

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Scientific opportunities with intense polarized neutrons

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  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

  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 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 1 mm structure • SERGIS: Lateral surface structure high resolution OR high intensity high resolution AND high intensity Pynn et al. (2002)

  5. 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

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

  7. 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

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