Instrument Development Group

Lee Robertson (group leader)Wai-Tung (Hal) LeeLowell CrowXin (Tony) TongHassina Bilheux (matrixed)Mike FleenorDucu Stoica (40%)Akber Ismaili (intern)Ruth Lawson (admin)

2 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

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.

3 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Instrument Development GroupOBJECTIVES:1) Develop new instrument concepts for SNS STS1, SNS

STS2, and HFIR.2) Design, construct and operate instrument development

beamlines at HFIR and SNS.3) Continue development of prototype SERGIS and

Neutron Imaging beamlines.4) Continue development of 3He polarization techniques

and apparatus.5) Develop new neutron optical devices and techniques.6) Develop magnetic focusing and neutron beam transport

devices and techniques.

4 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Instrument Development GroupOBJECTIVES: (cont)7) Establish an instrument simulation software

infrastructure for use by instrument scientists and the user community.

8) Provide design and development support of ongoing instrument development projects.

9) Identify new materials for use in neutron optical applications as well as explore the degradation of current components due to radiation damage, etc.

10)Reestablish the Instrument Development Fellowship program by securing a new source of financial support.

5 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Long Term Goals

1) Propose new instrument concepts for SNS 2nd target station and HFIR HB2 cold source.

2) Develop magnetic beam transport techniques.3) Develop magnetic focusing techniques.4) Develop capability to fabricate larger, more complex

guide components.

6 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Instrument Development BeamlinesWe 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.)

7 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Instrument Development Beamlines

SERG

IS

UtilityDiffractometer

Monochromatic: Imaging/Optics

Pulsed: Instrument D

evelopment/Optics

HFIR Development BeamlinesCold Guide #1 (CG1)Operational in June 2009

8 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

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).

9 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

3He Polarizers and Analyzers

Laser opticsCoils & Shield

Oven

3HeNeutron Beam

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.

10 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

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.

To dry pump

Getter

Baratron

Baratron

Baratron

Getter

Getter

To turbo pump

To filter cell

Polarize

Sealed cell preparation

Valved cell

Sealed cell preparation

3He

4He

Regulator N2

Regulator

Regulator

11 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

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

Depolarized gas recycling

Polarized gas transfer

Wide-angle analyzer

72% cell optimize at 90 meV

Time (hours)

0 5 10 15 20 25 30 35 40 45 50

PH

e, P

n, T

n, P

2 T

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

12 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

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

Neutron Imaging at HFIR and SNS

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

Why Neutron Imaging? — Increase and diversify NSSD user community— Bridge between fundamental and applied sciences: combined

information from neutron scattering and imaging—“Un bon croquis vaut mieux qu’un long discours” Bonaparte (A picture is

worth a thousand words)D. Schwarz et al.

B. Schillinger et al.

H. Bilheux et al.

13 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Focusing OpticsCollaboration 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.

14 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

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.

15 Managed by UT-Battellefor the U.S. Department of Energy NSSD Friday Seminar Series February 19th, 2009

Instrument Development Group