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Instrument Development Group. Lee Robertson (group leader) Wai-Tung (Hal) Lee Lowell Crow Xin (Tony) Tong Hassina Bilheux ( matrixed ) Mike Fleenor Ducu Stoica (40%) Akber Ismaili (intern) Ruth Lawson (admin). Instrument Development Group.

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instrument development group

Instrument Development Group

Lee Robertson (group leader)

Wai-Tung (Hal) Lee

Lowell Crow

Xin (Tony) Tong

Hassina Bilheux (matrixed)

Mike Fleenor

Ducu Stoica (40%)

Akber Ismaili (intern)

Ruth Lawson (admin)

instrument development group1
Instrument Development Group
  • Develop new optical devices, techniques, instrument concepts, and applications for neutron scattering.
  • Serve as a resource to advise and assist various IDTs and other scientists with instrument development.
instrument development group2
Instrument Development Group

OBJECTIVES:

  • Develop new instrument concepts for SNS STS1, SNS STS2, and HFIR.
  • Design, construct and operate instrument development beamlines at HFIR and SNS.
  • Continue development of prototype SERGIS and Neutron Imaging beamlines.
  • Continue development of 3He polarization techniques and apparatus.
  • Develop new neutron optical devices and techniques.
  • Develop magnetic focusing and neutron beam transport devices and techniques.
instrument development group3
Instrument Development Group

OBJECTIVES: (cont)

  • Establish an instrument simulation software infrastructure for use by instrument scientists and the user community.
  • Provide design and development support of ongoing instrument development projects.
  • Identify new materials for use in neutron optical applications as well as explore the degradation of current components due to radiation damage, etc.
  • Reestablish the Instrument Development Fellowship program by securing a new source of financial support.
long term goals
Long Term Goals
  • Propose new instrument concepts for SNS 2nd target station and HFIR HB2 cold source.
  • Develop magnetic beam transport techniques.
  • Develop magnetic focusing techniques.
  • Develop capability to fabricate larger, more complex guide components.
instrument development beamlines
Instrument Development Beamlines

We are in the process of constructing a set of four development beamlines at the end guide position of Cold Guide 1 (CG1) on the HB4 Cold Source at the HFIR. (operational June 2009).

  • CG1A: A reflectometer based on spin-echo encoding of the scattering angle. (SERGIS, collaboration with Roger Pynn)
  • CG1B: A utility beamline used to align crystals and prepare experiments to go on other instruments in the user program.
  • CG1C: A monochromatic (1.8 – 6.2Å) development beamline. (testing of optical components, development of neutron imaging – Hassina Bilheux, etc.)
  • CG1D: A TOF/white beam development beamline. (wavelength dependence of optical components, low energy cross-

section measurements, etc.)

instrument development beamlines1
Instrument Development Beamlines

HFIR Development Beamlines

Cold Guide #1 (CG1)

Operational in June 2009

Utility

Diffractometer

SERGIS

Monochromatic: Imaging/Optics

Pulsed: Instrument Development/Optics

instrument simulations
Instrument Simulations
  • We are working on better software tools to couple moderator/source design and optimization with that of the instruments.
  • We are developing “canned” simulation packages of the existing instruments for scientists to use when planning their experiments and analyzing their data.
  • We are working on new computational tools that will allow us to combine the ability to handle complex geometries (Monte Carlo) with the insight one obtains from phase space analysis (Acceptance Diagrams).
3 he polarizers and analyzers
3He Polarizers and Analyzers
  • In-situ polarizer / analyzer
  • Currently implemented on SNS BL4a (Magnetism Reflectometer) as a polarization analyzer.
  • Future: Replace hot air heating with electric resistive heating.
  • Future: Side-pumped
  • in-situ system.

Laser optics

Coils & Shield

Oven

Neutron Beam

3He

seop based polarized 3 he filling station
SEOP-Based Polarized 3He Filling Station
  • Completed: assembly and testing of gas-supply system.
  • Current: successfully filled a cell with the 3He alkali mixture.
  • Future: Ability to fill cells with polarized 3He to specified pressure.

Baratron

Sealed cell preparation

Getter

N2

Regulator

Polarize

To turbo pump

Baratron

To filter cell

Getter

Regulator

3He

Valved cell

Baratron

To dry pump

Getter

Regulator

4He

Sealed cell preparation

instrument based 3 he polarizers and analyzers
Instrument Based 3He Polarizers and Analyzers
  • Wide-Angle Analyzer for HYSPEC
    • Current: wide-angle quartz cell
    • Current: uniform-field coil design for use on the instrument
    • Future: compact polarized gas filling station

No stress point seen under polarized light

Polarized gas transfer

Wide-angle analyzer

Depolarized gas recycling

neutron imaging at hfir and sns
Neutron Imaging at HFIR and SNS
  • Why Neutron Imaging?
    • Increase and diversify NSSD user community
    • Bridge between fundamental and applied sciences: combined
    • information from neutron scattering and imaging
    • “Un bon croquisvautmieuxqu’un long discours” Bonaparte (A picture is
    • worth a thousand words)

D. Schwarz et al.

  • CG-1: prototype imaging beamline (a.k.a. Hassina’s playground):
  • Today’s “hot” topics: Energy Research, Clean Transportation
  • Bio-engineering, Bio-medical and Forensic Science
  • Materials science/Engineering
  • Life sciences (Botany and Geology)
  • Archeology and Paleontology
  • Developing new techniques and
  • Quantitative tools

H. Bilheux et al.

  • VENUS: one of a kind imaging facility at SNS
    • LOI has been approved
    • Full proposal to be submitted this Spring

B. Schillinger et al.

focusing optics
Focusing Optics

Collaboration with Gene Ice (ORNL) to apply focusing optics using Kirkpatrick-Baez as well as elliptical mirrors on Neutron scattering instruments.

We are also collaborating with Boris Khaykovich (MIT) on the use of Wolter mirrors for focusing the neutron beam.

guide development
Guide Development
  • Materials science study of guide degradation and lifetime.
  • Optimize guide configurations for specific applications (parabolic, tapered, elliptic, logarithmic, ballistic).
  • Experiment with using capillary optics (developed for x-rays) for focusing the beam.
  • Experiment with various surface treatments (etc.) to improve the performance of supermirror coatings.