instrument development test station at hfir cg1 lowell crow, may 15, 2009
TRANSCRIPT
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)