Instrument Development Test Station at HFIR CG1 Lowell Crow, May 15, 2009

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Instrument Team

Lee Robertson, Lowell Crow, Wai-Tung Hal Lee, Xin Tong, Mike Fleenor, Hassina Bilheux, Ducu Stoica, Akber Ismaili, Instrument Development Group, Neutron Facilities Development Division

Engineering Support: Barton Bailey, Warren Sharp, Ken Chipley, Steve Rogers, Dave Conner

Project Support/Installation/Neutronics: Doug Selby, Gary Lynn, Franz Gallmeier, HFIR Instrument Support, etc.

Potential Users: Developers of neutron instruments and neutron instrument components

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Why do we need development beams?

We need moderators, guides, filters, shutters, choppers, monochromators, analyzers, focusing devices, sample environments, detectors, shielding , etc. All need testing

Can’t we use existing instruments? We do! Just a few examples from memory

Detectors: HB-3, CG2, HB-2DS at HFIR; BL3, BL4B at SNS, QUIP at IPNS, Cf Sources

Optics: ORELA, BL3, LENS

Polarizers: HB-3A, BL4A, LENS

Monochromators: HB1A, HB3, Missouri

Sample Alignment: HB1A

This is difficult to schedule on busy, oversubscribed user instruments

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This has been going on a long time

First Prototype Neutron Diffractometer -- Wollan and Shull 1946

From C. G. Shull, Rev. Mod. Phys. Vol. 67, No. 4, 1995

Operational Powder Diffractometer at Graphite Reactor 1949

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What do we need for development now?

Variable time-of-flight beam for wavelength-dependent measurements and component timing tests

Variable wavelength monochromatic beam for optics tests, material measurements, and imaging tests

A thermal beam for aligning samples and preparing monochromators and analyzers

A cold beam for development of polarization measurement techniques

Having any of these available for development could help us

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Where could we put a Development Station at HFIR?

HB-2D – 2004MIRROR reflectometer detector test station

CG-4A and

CG-4BFixed takeoff

angles

CG-4DImagine

“Future Development” Locations

CG-1Large area end station

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Where could we put a Development Station at SNS? – similar number of locations, higher cost

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A closer look at CG1CG1 guide on the HFIR Cold Source:

large area (25 mm wide × 150 mm tall) high flux (4.2 × 109 n/cm2 s) cutoff of about 1.6 Å.

Guide Calculations by Ralph Moon (2001)

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The Plan – divide the beam

4 beams for neutron instrument and component development:

CG1A – SERGIS (Spin Echo – Resolved Grazing Incidence Scattering) prototype development

CG1B – Utility Diffractometer, for sample alignment and monochromator development

CG1C – Double Crystal Monochromatic beam for neutron imaging and component development

CG1D – Chopper Time-of-Flight beam for component development

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Disk Chopper

CG1A SERGIS Development

CG1B Utility Diffractometer

MonochromaticImaging &

Development

Neutron Optics / Imaging

Time-of-Flight

CG1 Main Beam

Monochromator / Chopper Shielding Enclosure

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Drawing showing monochromators and chopper in enclosure

Upper 60 mm – graphite monochromators for SERGIS and Utility Diffractometer

Lower 90 mm – double bounce plastically deformed Si (111) crystals for variable monochromatic beam

Chopper (formerly used at GPPD at IPNS) for cold time-of-flight beam

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CG

1A S

ER

GIS

CG

1B U

tilit

y

CG1

HFIR Cold Guide Hall

CG1C Monochromatic

Imaging/Development

CG1D Time-of-F

light

CG1 Floor Plan

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CG1A: SERGIS Beamline: 4.22 Å, > 106 n/cm2 sHal Lee, Tony Tong

Development of the SERGIS (Spin Echo Resolved Grazing Incidence Scattering) technique – use spin echo to measure scattering angles; already demonstrated at several labs

-- with this flexible beamline, learn more about components and overall arrangement, possibly try SESANS or other SESAME techniques

Collaborative experiments

(Roger Pynn, Indiana, Wei-Ren Chen, ORNL)

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CG1B: Utility Diffractometer2.35 Å beam, ~107 n/cm2 sWork with Triple Axis Group to develop a 2-axis diffractometer

Sample alignment ( now takes time on busy inelastic instruments)

Monochromator/analyzer crystal development

Neutron camera development

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CG1C: Monochromatic Development Beamline (1.8-6.2Å)Neutron component and technique development:

Neutron imaging development

Hassina Bilheux – effort to build components, experience, and community for VENUS development

Focusing neutron optics: mirrors, capillary, magnetic

Guide development and optimization of guides.

Materials science study of component lifetime. 3He polarization development.

Detector development

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CG1D: TOF/White Beam Development BeamlineDevelopment for pulsed source Energy-dependent techniques

Focusing and beam transport.3He polarization development.Imaging development Low energy cross-section measurements Shielding development HB4 Cold Source characterization.Detector development

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Some 2-month old assembly pictures

Inner box in the polarization lab (now moved to HFIR)

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Outer box delivery March 2009

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Outer box delivery March 2009

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Status Today

Instrument shutter – mounted, tested (mechanically and radiologically)

Outer shield box – walls filled with lead, aligned and mounted in place

Inner shield box – monochromator stages installed

Secondary shutters – in fabrication

Planning for installation of all parts needed to open C/D beams by start of HFIR cycle 422 (June 24)