SNS Experimental FacilitiesOak Ridge X0000910/arb Neutron Instruments for Materials Research T.E....

SNS Experimental Facilities Oak RidgeX0000910/arb

Neutron Instruments for Materials Research

T.E. Mason

Experimental Facilities Division

Spallation Neutron SourceAcknowledgements: Doug Abernathy, John Ankner, Ken Herwig, Frank Klose, Jinkui Zhao, Xun-Li Wang

A Brief Aside on What You Actually Measure:

98-6249 uc/rra

Neutron Scattering Cross-Section

98-6250 uc/rra

CW vs Pulsed Instrumentation

• In general continuous sources work with fixed wavelengths (, all t) and pulsed sources work with a wavelength band (t, all – using time and distance to determine velocities and hence wavelengths)

• If the useful wavelength band is dispersed over the full time between pulses then the pulsed instrument counts useful neutrons all of the time and the figure of merit is the peak flux

• If the full time between pulses is not useful then the figure of merit is reduced by the duty cycle

• For fixed wavelengths, counting continuously the integrated flux is the figure of merit

• Variations (e.g. pulsed instrument at CW source) can, and do exist

Example – Reactor - SANS

As an example consider the static approximation in ahomogeneous system:

Fourier transform of scattering length density for an object

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cAMP-Dependent Protein Kinase (PKA)Combining Neutrons with X-rays

•PKA catalyzes a variety of cellular activities, ranging from gene induction to color change in pigment cells.•PKA serves as the prototype for a class of enzymes which catalyzes protein phosphorylation, the major mechanism of cellular regulation.•The combination of neutron studies and x-ray structures of PKA subunits has provided insights into the quaternary structure of PKA, which is key to the understanding of PKA function.

• RC with deuterated R-subunit

• PKA (R2C2) with deuterated R-subunits

• Free C and Truncated R with x-ray

Neutron Contrast Data of PKA and RC

Momentum Resolution

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Having Made Some Neutrons WeWant A Monochromatic Beam!

98-6253 uc/trh

Pinhole SANS

• NIST/NSF 30 m SANS

• NG-3 cold neutron guide

• 20 MW reactor, hydrogen cold source

NIST SANSCharacteristics and Performance

• Source: neutron guide (NG-3), 60 mm x 60 mm • Monochromator: mechanical velocity selector with variable speed and

pitch • Wavelength Range: 0.5 nm-2.0 nm • Wavelength Resolution: 9%-30% (FWHM) • Source-to-Sample Dist.: 4 m to 16 m in steps via insertion of neutron

guide sections • Sample-to-Detector Dist.: 1.3 m to 13 m • Collimation: circular pinhole collimation • Sample Size: 0 to 25 mm diam • Q-Range: 0.015 nm-1 to 6 nm-1 • Detector: 650 mm x 650 mm 3He position-sensitive proportional

counter (10mm resol.)

• excitations characterized by ´´(Q,) a measure of absorption at (Q,).

• neutron scattering measures:S(Q,) ~ ´´(Q,) [n()+1].

• note: Q 0, recover uniform susceptibility.

• the proportionality constant involves magnetic moment direction and form factor.

Neutron Scattering and Spin Fluctuations

B ( , )Q

neutroninduces

transi tion

o(Q,) for Metals

• Excitations are electron-hole pairs

• Lindhard susceptibility:

• As T 0 states near F dominate

• Note: NMR relaxation rate:

B p q p

p q ppN

i( , )

( ) ( )

( , )Q

Normal State Energy Dependence

• As the frequency is increased the peaks become less well defined.

• The response is qualitatively quite similar to that of the spin density wave system Cr, above TN.

Example – Reactor –Triple Axis

• RITA (Re-Invented Triple Axis) at Risø, DR-3 Denmark

• 10 MW reactor, supercritical hydrogen cold source

Having Made Some Neutrons WeWant A Monochromatic Beam!

98-6254 uc/trh

For Inelastic Scattering You AlsoNeed Energy Analysis

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Crystal Monochromator (continued)

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Triple-Axis Spectrometer Resolution

• There are analytical methods for calculating the resolution (Cooper + Nathans, Nielsen + Bjerrum-Møller, Popovici)

• These are obtained from the program RESCAL forcollimation 60'– 60'– 60' – 60'30' PG002 monochromator and analyzer10' sample mosaicEf = 5meV ( = 4.04 Å)h = 0 q = 1 Å-1

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Incident Beam Optics

• Supermirror guide in front of the monochromator increases flux• Sapphire filter reduces gamma and fast neutron background and

protects guide• Velocity selector in front of monochromator remove higher order

Effect of the Guide

Secondary Spectrometer

• Area detector and analyser crystal array permits flexible focussing

SPINS at NIST

• A similar (on the back end) instrument is SPINS at NIST

Time-of-Flight Inelastic Instruments

• Two basic types – direct geometry – fixed Ei (e.g. HET chopper)

– Indirect geometry – fixed Ef (e.g. IRIS backscattering)

Chopper Spectrometers

• Operate in the thermal to epithermal energy range – 5 meV < Ei < 1000 meV

• Use fast, magnetic bearing Fermi choppers to select E i

• Maximal Q range with continuous coverage to large scattering angles– Need room at least on one side for scattering chamber

Consider two choppers should be placed on the bottom upstream moderator at end positions - BL9 & BL18 at SNS

Target Layout

X = 5 m

X = 6.5 m

Geometric constraints

BL18: X = 5 m m = 35°

For 2 >125° & Lf = 2.5 m , Li =13.0 m

For 2 = 60° & Lf = 6.0 m , Li =13.1 m

BL9: X = 6.5 m m = 35°

For 2 >125° & Lf = 2.5 m , Li =15.7 m

For 2 = 60° & Lf = 6.0 m , Li =15.8 m

m fm i 2sinLsinL X

Accessible regions in Lf lie below a straight line in (Li,Lf) plane

Flux on sample at 200meV - 5% elastic resolution

Optimum flux not accessible for any L3

BL18 Constrained 5% elastic resolution

0.0E+00

1.0E+05

2.0E+05

3.0E+05

4.0E+05

5.0E+05

6.0E+05

7.0E+05

0 10 20 30 40 50 60

Source-Sample distance (m)

1000meV

200meV

Flux on sample at 200meV - 1% elastic resolution

Can optimize flux for a given L3 that is not too large

BL18 1% elastic resolution

0.0E+00

1.0E+04

2.0E+04

3.0E+04

4.0E+04

5.0E+04

6.0E+04

7.0E+04

8.0E+04

9.0E+04

1.0E+05

0 10 20 30 40

Source-Sample distance (m)

L3 = 6m

L3 = 5m

L3 = 4m

Proposed two spectrometer layout

Pit Area

Sample

Beamstop

Detectors

BL17 - “high resolution”

BL18 - “high flux”

Instrument parameters

Spectrometer High Flux High Resolution

Ambient H2O decoupled poisoned 18BU 100mm(H) x 120mm(V)Moderator anddimensionsAngle 13.75 (possible 27.5 ) 0 (possible 13.75 )GeometrySource-chopper (L1)Chopper-sample (L2)Sample-detector (L3)

12.0m1.5m2.5m

15.5m2m6m

ChoppersT0 horizontal axisT0 vertical axisE0 (Fermi) vertical axis

Mechanical 60 Hz @ 7.0m(Magnetic 300 Hz @ 7.5m)Magnetic 600 Hz @ 12.0m

Mechanical 60 Hz @ 9.0mMagnetic 300 Hz @ 10.0mMagnetic 600 Hz @ 15.5m

GuideTypeLength

Tapered supermirror 3c

~7mTapered supermirror 3c

Apertures and collimatorsAfter E0 (Fermi) chopper

2 VariableSoller collimator

3 VariableSoller collimator

Max. sample size 50mm(H) x 75mm(V) 50mm(H) x 75mm(V)

Instrument parameters

Spectrometer High Flux High Resolution

Scattering/samplechamberRadius sample-detectorHeightVacuum at sampleVacuum flightpathCollimationShielding, innerShielding, outer

2.5m2.5m< 10-6 torr< 10-2 torrOscillating radial collimatorB4C, 50m2

~0.5 m (TBD) thick, 100m2

6m6m< 10-6 torr< 10-2 torrOscillating radial collimatorB4C, 150m2

~0.5 m (TBD) thick, 250m2

Linear PSDsNumberTypeDiameterLengthResolutionTotal pixelsAngular range, horizontal

Vertical, low bank Vertical, high bankLow bank solid angle/areaHigh bank solid angle/areaTotal area

5403He 10 atm25mm900mm25mm50,400-45 to -3 , 3 -150

2.15 sr / 13.5 m2

13.5 m2

12003He 10 atm25mm900mm25mm50,400-30 to -2 , 2 -30 (low), 30 -60 (high) 30 100.70 sr / 26 m20.12 sr / 4 m230 m2

Resolution and flux calculations

0.0E+00

1.0E+05

2.0E+05

3.0E+05

4.0E+05

5.0E+05

6.0E+05

7.0E+05

8.0E+05

0 1 2 3 4 5

Elastic resolution (%)

1000meV High Flux 50meV High Flux1000meV High Res 50meV High Res

Resolution and flux calculations

1.0E+03

1.0E+04

1.0E+05

1.0E+06

1 10 100 1000 10000

Energy (meV)

High Flux 3.0%

High Res 1.4%

Q- space accessible with proposed spectrometers

Q (Å-1)0.01 0.1 1 10 100

d (Å)0.1110100

2eV crystal analyzer

10-100eV multichopper1% high-resolution chopper3% high-flux chopper

Comparison to current chopper spectrometers

Instrument L1 (m) L2 (m) L3 (m) Moderator,Tilt

% energyresolution

AngularRange(Hor)

DetectorSolidAngle (sr)

LRMECSANL

6.2 0.8 2.5 CH4 2.5 – 7 % 3 - 120 0.3

HRMECSANL

12.7 1.1 4 CH4 2 – 4 % 3 - 140 0.5

HETISIS

10 1.8 2.5/4 H2O, 27 2 – 4 %3 - 30110 - 135

MARIISIS

10 1.7 4 CH4, 13 1 – 3 % 3 - 132 0.1

MAPSISIS

10 2 6 H2O, 14 1 – 3 % 3 - 60 0.45

PHAROSLANSCE

18 2 4 H2O , 15 1.5 - 3% 1 - 140 0.65

PHOENIX ISIS(HET upgrade)

12 1.8 2.5 H2O, 27 2 – 4 % 3 - 150 3.1

SNSHigh flux

12 1.5 2.5 H2O, 14 2 – 4 % 3 - 150 2.15

SNSHigh res.

15.5 2 6 H2O, 0 1 – 1.5 % 2 - 60 0.82

High Resolution Backscattering Spectrometer

• Performance gains over comparable reactor backscattering instruments >100 (depending on bandwidth needed)

• High-Q option (with Si 311) 500x IN13 and 18x IRIS (with 3 times Q range and better resolution!)

• Crystal analyzer (Si) with 84 m incident flight path

• Achieves 2.2 eV resolution at the elastic position with

250 eV bandwidth

• Can operate up to 18 meV energy transfer with 10 eV resolution

• Unprecedented capabilities

2000-03452/arb

Instrument Resolution and Q- Range

0 5 10 15

• Elastic Resolution 2.2 eV (fwhm)

supermirror funnel

detector for top analyzer

detector forbottom analyzer

beam stop

top analyzerbottom analyzer

evacuatedsample chamber

scattering vessel

Scattering Chamber

Guide Design

• 84 m total flight path moderator face to sample

• Curved guide– radius of curvature 4.325 km

– 10 cm horizontal x 12 cm vertical

– Natural Ni (outer radius horizontal needs higher index)

– begins 1 m from moderator face

• Supermirror funnel, ends 30 cm from sample– horizontal, 3 x c for Ni, 10 cm to 3 cm over 5 m

– vertical, 4 x c for Ni, 12 cm to 3 cm over 6 m

• Gains– 1200; = 6.3 Å

– 400; = 3.2 Å

Shutter and Core Insert Regionsfor the Standard Shutters

Distance from Moderator (m)

0 1 2 3 4 5 6 7

= 6.3 Å

= 15 Å

Major Spectrometer Components

• Source/Moderator decoupled, supercritical poisoned H2, TU

• Incident flight path - 84 m moderator face to sample position

• Chopper System - 3 bandwidth/frame overlap choppers

• Sample - dimensions 3 x 3 cm2

• Analyzer crystals, Bragg angle = 88 deg– Si (111): = 6.267 Å, 2.9 ster, 26 m2, d/d ~ 3.5 10-4

– Si (311): = 3.273 Å, 1.45 ster, 13 m2, d/d ~ 4.0 10-4

• Final flight path - 3 m sample-analyzer, 2.5 m analyzer-detector

• Detectors– Backscattering for diffraction

– ~ 7040 cm2 PSD 1 x 1 cm2 spatial resolution

Melittin in Alkanethiol/Phospholipid Hybrid Bilayer Membranes - NIST

NG1 Reflectometer: Polarized Beam - NIST

0.0 0.1 0.2 0.3 0.4 0.510-10

Neutron Reflectivity and 2-Layer Fitof 10nm. SiO2 Film on Si

Q[A-1] 0 5 10 15 20 25

1x10-4

2x10-4

3x10-4

4x10-4

m -2 ]

Depth [nm]

MBE Chamber for In-situ Neutron Scattering on the NG1 Reflectometer

UHV Techniques Protective Environment

Epitaxial Thin Film Growth

Gas Loading (e.g. H)

Sputter Etching of Surface Material

RHEED Analysis

Mass Spectrometry

Scattering TechniquesSpecular Reflectometry

Off-Specular Scattering

Grazing Angle Diffraction

High Angle Diffraction

PhenomenaAdsorption / Desorption

Diffusion

Segregation

Morphology

Crystallography

Magnetism

Superconductivity

Joe Dura NIST-NCR

Reflectometry

• In addition to providing a unique probe for magnetic surfaces and multi-layers polarized neutrons permit direct inversion to obtain the scattering length density profile - no phase problem– a magnetic reference layer buried in the substrate can have

magnetization wrt neutron polarization varied

– for a weak absorbtion probe (valid for the neutron) three known references lead to unique solution

– drawback is the price paid in sensitivity for polarized beam

• Off-specular reflection for in-plane structure

SNS Reflectometers

• 2 reflectometers sharing a single beamport

• Requires new multi-channel shutters in the target station

• Allows for both vertical sample (magnetism) and horizontal sample (liquids) studies

• Novel beam bender optics allows multiplexing and reduces background

• Reflectivities <10-9, 10-50 times faster than any existing instrument

2000-03451/arb

Instrument features

• Views coupled 20-K H2 moderator from beamline 4TD

• Shares beamline with magnetism reflectometer

• Multi-channel beam bender eliminates all < 1.5 Å

• Three bandwidth choppers allow clean operation in 0.5-4.5, 5-9, or 9.5-13.5 Å wavelength frames

• Tapered guide delivers angular bandwidth that can be sampled by slits at 0 < < 7° relative to the horizontal

• 1-mm2-resolution PSD permits study of off-specular and grazing-incident small-angle scattering

• For liquid samples 0 < Q < 0.5 Å-1 is accessible; by tilting a solid surface, 0 < Q < 1.0 Å-1 (Rmin ~ 4×10-10)

Schematic

SourceMicroguide

BenderTaperedGuide Slits

Detector

14.5 m

Bandwidth Choppers

• Bender/tapered guide combination eliminates source line-of-sight

• Tapered guide delivers angular bandwidth that allows multiple angles of incidence

Microguide bender4c

• Bender acts as high-pass wavelength filter

• Multiple channels n transmit higher flux

[Left]: Phase-space acceptance at 5-channel bender exit for 9-Å neutrons after 0-5 bounces (red-green). [Right]: Integrated acceptance for n-channel benders.

Reflectometer beam benders

Bender insidewide shutterdeflects the beamdownward to a4.75° angle ontosample surface.

Sample

Tapered guide

Tapered guide provides angular bandwidth for liquid measurement. Slits select sample incident angle about = 4.75° centerline.

1.75 cm

Contours representratio of actual to maximum optical acceptance (X / Xmax)at tapered guide exit.

= 2.06°; = 0.0014;X / Xmax = 0.89; mavg = 3.3

= 4.75°; = 0.0061;X / Xmax = 0.86; mavg = 1.3

Slit settings off the = 4.75° centerline exhibit higher averagenumber of bounces mavg. Judicious selection of incident angle ensures optimal acceptance X.

Liquids reflectometer

1.E-111.E-101.E-091.E-081.E-071.E-061.E-051.E-041.E-031.E-021.E-01

1.E+00

0.00 0.25 0.50 0.75 1.00

Q (Å-1)

0.20° 1

0.30° 2

0.50° 4

0.75° 7

1.20° 12

1.90° 21

3.00° 33

4.25° 53

5.75° 103

8.00° 436

11.25° 6436

15.00° 15436

Performance comparison

POSY-II

MURRADAM,NG-1

SNS reflectometers will accumulate specular reflectivity data 10-50 times faster than the best existing instruments. ImprovedQmax will yield near-atomic-scale layer-thickness sensitivity.

Simulated data from 10-ÅSiO2 layer atop Si. SNS-Lutilizes 12 incident anglesi to measure Qmax > 0.9 Å-1

in t < 5 hours (18,000 s).Arrows indicate reflectivities measured in 12-24 hours(40-80,000 s) by existing instruments.

i ti (s)

SNS Powder Diffractometer

Detector Array

Characteristics of Major Components

• Source/Moderator - decoupled poisoned ambient water

t0 = 10 s at = 1 Å

• Incident Flight Path - 60 m moderator-sample distance

curved supermirror guide with 3cNi coating, 1.5 cm wide x 3 cm tall

~ 8 m moderator-guide distance adjustable 9 m guide-sample distance

• Chopper System - To and 2 bandwidth/frame-overlap choppers

• Collimators - variable aperture for incident beaminside scattering chamber - oscillating radial collimator

outside scattering chamber - fixed radial collimators

• Detectors - type TBD 10° – 170° in-plane, ±30° out-of-plane coverage (±45° at 90°) 40 mm tall x 5 mm wide pixel size~ 6 ster solid angle coverage, ~ 47 m2 area1 – 6 m variable distance from sample

Narrow Bandwidth Concept

• Previous TOF diffractometers used detector "banks" at a few angles, along with a broad wavelength range to produce a limited number of data sets of intensity vs. wavelength.

• A new idea put forward by Paolo Radaelli proposes the use of wide angular coverage and full 60 Hz operation to collect a single data set of intensity vs. angle and time-of-flight. These spectra would then be combined "appropriately" after-the-fact to produce a single histogram with intensity vs. d-spacing.

• This new data collection/analysis concept can be applied to any detector geometry. However, it appears optimally suited to a continuous detector locus, with this locus chosen to optimize the resolution as a function of d-spacing.

D-spacing-Lambda Space Coverage

0 1 2 3 4 5 6 7 80

low-resolution

high-resolution

-22 = 20°

2 = 30°

2 = 60°

2 = 90°2 = 150°

narrow bandwidth discrete banks

incident lambda (Å)

GEM Powder Diffractometer at ISIS

Detector Locus

= A + Bcot

D-spacing Coverage of POW-GEN3

Instrument Resolution Function

180 160 140 120 100 80 60 40 20 00.000

GEM-ISIS HRPD-ISIS POW-GEN3

Scattering Angle (°)

Neutron Source

0 1 2 3 4 5 60

2MW-SNS POW-GEN3 0.15MW-ISIS GEM

Wavelength (Å)

Neutron Source

0 1 2 3 4 5 6 7 8 9 100

2MW-SNS POW-GEN3 0.15MW-ISIS GEM

Wavelength (Å)

Simulated Diffraction Experiment

1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.400

120000.5 gram Y-Al-Fe-O Garnet 60s (d/d = 0.0002)

POW-GEN3 GEM 90° Bank

d-spacing (Å)

Simulated Diffraction Experiment

0.45 0.50 0.550

10000.5 gram Y-Al-Fe-O Garnet 60s (d/d = 0.0002)

POW-GEN3 x10 GEM 155° Bank

d-spacing (Å)

Another Variation on Powder Diffraction: Residual Strain

SNS SANS

0 1 2 5 8 1 0 1 4d istan ce fro mm od era tor [m ]

Next Bea m lin

Schematic Layout

Bender System: guide-bender-guide

LxRxLL

2 and ;

2);tan()

;)sin(

)sin( ; with )1)(

Bender System: Performance

Choppers

0 20 40 60 80

Time [ms]

1.03Å

4.65Å

0 20 40 60 80

Time [ms]

3.72Å

Soller Collimators: Configuration

14 m(S a m p le)

18 m(D etector )

10 m 12 m

G uid e

Soller Collimators: Direct Beam

2c m 1c m 4c m

16m 16m

14 m(S a m p le)

18 m(D etector )

10 m 12 m

G uid e

Soller Collimators: Resolution and Flux

8m pinhole1cm sample

1cm beam spot,2cm sample

1cm beamspot,

1cm sample

0 1 2 3 4F lux : 16m pinhole

0.1 1 10two-th ita [°]

Soller: source=1.75cm ,sam ple=1cm . Beam size ondetector =1cmSoller: source=3.5cm ,sam ple=2cm . Beam size ondetector =1cmpinhole: source-sam ple=8m ,detector-sam ple=8m

pinhole: source-sam ple=16m ,detector-sam ple=16m

Low Angle Detector

Needed:1 x 1 m2

5mm resolution 1Å103 n/s/pixel4 x 107 n/s/detector low background

Needed:1 x 1 m2

5mm resolution 1Å103 n/s/pixel4 x 107 n/s/detector low background

Available (3He):1 x 1 m2

7 mm resolution 5Å104 n/s/wire106 n/s/detectorLow background

Available (3He):1 x 1 m2

7 mm resolution 5Å104 n/s/wire106 n/s/detectorLow background

1.25 2.5 bar (concave structure)counting efficiencyresolutioncounting rate

5mm wire spacing.

1.25 2.5 bar (concave structure)counting efficiencyresolutioncounting rate

5mm wire spacing.D etek to r

B alas tkam m er ( H e)4

M em bran

K a lo tte(D ruckausgle ich)

High Angle Detectors

20 x Standard 3He PSD

Performance: Flux at the End of the Bender-Sytem

Performance: Flux at Sample (14m)

1.E+05

1.E+06

1.E+07

1.E+08

1.E+09

1.E+10

0 2 4 6 8 10 12 14

Wavelength [A]

1 m co llim ation , S u m = 9.14 E 82 m co llim ation , S u m = 4.79 E 83 m co llim ation , S u m = 2.29 E 84 m co llim ation , S u m = 1.3E 8

Performance: Flux vs. Collimation

Max. counting rate: 700n/s/pixel at 1m collimation 100n/s/pixel at 4m collimation

1.E+06

1.E+07

1.E+08

1.E+09

0 5 10

Collimation length [m]

integrated flux between7.33 and 10.99ÅHFIR,9.16Å, 10%

1.E+06

1.E+07

1.E+08

1.E+09

1.E+10

0 5 10

integrated flux between3.66 and 7.33ÅHFIR,5.49Å, 10%

1.E+06

1.E+07

1.E+08

1.E+09

1.E+10

0 5 10

integrated flux between 1and 4.66ÅHFIR,2.83Å, 10%

Q-Coverage

0 5 10Q [Å -1]

D 2O (coh + inc)

H 2O (coh on ly)

protein

lipid(solvent)

Qmin= 0.004 Å-1 (Pinhole) = 0.001 Å-1 (Soller)

Qmax = 12Å-1 (1st Frame)= 3.3Å-1 (2nd Frame)= 1.6Å-1 (3rd Frame)

3rd Frame 1st Frame

Huey HuangRice University

Performance (low angle detector)

Extend-Q SANS

30-Meter SANS, NIST (Q=0.0015-0.6 Å-1)

(=15%) Qmin [Å-1]

Simulated flux

×106 [n/s]

Qmin [Å-1] Measured flux(*)

×106 [n/s] 0.001-0.15(s) 0.8, 3 (2cm) 0.0015-0.3(s) 7, 25(2cm) 0.0015-0.013(10Å) 0.09 0.004-0.13 14 0.002-0.019(7.5) 0.26 0.006-0.25 120 0.003-0.025 0.85 0.008-0.35 170 0.0064-0.04 6.38 0.01-0.5 360 0.016-0.1 30.9 0.02-0.8 820

Performance

1.E+05

1.E+06

1.E+07

1.E+08

1.E+09

1.E+10

1.E+11

0.001 0.01 0.1 1 10

Q [1/Å]

1st Fram e, 0-4m collim ations2nd F ram e, 0-4m collim ations3rd F ram e, 0-4m collim ationsSoller, 1-3 fram esSoller,2cm x2cm sam pleH igh Angle Detec tors, 1-3 fram esNIST 30m S ANSD11/ILL

100Å Polystyrene (0.625%) in 5mm D2O, 15sec simulation

1.E -02

1.E -01

1.E+00

1.E+01

1.E+02

1.E+03

0 0.05 0.1 0.15 0.2 0.25 0.3

Q [1/Å]

]Theore tica lExtended-Q SAN S, 2nd fram e, 4m sam ple-to-detector3 X H FIR SANS, 6Å,10% , 4m sam ple-to -detector

100ÅGuide Detector

Performance : MC simulation

SNS Experimental FacilitiesOak Ridge X0000910/arb Neutron Instruments for Materials Research T.E....

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