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

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

2 Managed by UT-Battellefor the U.S. Department of Energy Presentation_name

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


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


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


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


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


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


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)


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


Disk Chopper

CG1A SERGIS Development

CG1B Utility Diffractometer

MonochromaticImaging &

Development

Neutron Optics / Imaging

Time-of-Flight

CG1 Main Beam

Monochromator / Chopper Shielding Enclosure


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


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


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)


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


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


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


Some 2-month old assembly pictures

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


Outer box delivery March 2009


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)

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

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