Developing MACS A Third Generation Cold Neutron Spectrometer - - PowerPoint PPT Presentation

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Developing MACS A Third Generation Cold Neutron Spectrometer - - PowerPoint PPT Presentation

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MACS a New High Intensity Cold Neutron Spectrometer at NIST Developing MACS A Third Generation Cold Neutron Spectrometer February 17, 2003 Timothy D. Pike 1 MACS a New High Intensity Cold Neutron Spectrometer at NIST What is MACS?

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February 17, 2003 Timothy D. Pike 1

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Developing MACS

A Third Generation Cold Neutron Spectrometer

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February 17, 2003 Timothy D. Pike 2

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

What is MACS?

MACS is a Multi Axis Crystal Spectrometer that is under development at the NIST Center for Neutron Research. This third generation cold neutron spectrometer will provide ultra high sensitivity access to dynamic correlations in condensed matter

  • n length scales from 0.1 nm to 50 nm and

energy scales from 0.05 meV to 20 meV. The project is funded jointly by the NIST Center for Neutron Research, the National Science Foundation, and the Johns Hopkins University and will be complete in the fall of 2006. This talk will discuss the state of the design as a snapshot of the overall instrument development process.

Professor Collin Broholm Johns Hopkins University

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February 17, 2003 Timothy D. Pike 3

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Scientific Program and Requirements

What type of Spectrometer is MACS? Which experiments is it good for? Specifications to MACS-imize science output

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February 17, 2003 Timothy D. Pike 4

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Goals in Neutron Spectroscopy

  • A central tool in condensed matter physics

– Unique information about dynamic correlations – Model independent access to interaction strength – Access microscopic structure of dynamic systems

  • Limited scope on current instruments

– Need cm3 sized crystals – Need weeks of beam time – Need to be neutron scattering expert

  • Increased sensitivity will broaden impact

– Smaller samples earlier in new materials cycle – Impact in a wider range of science – Parametric studies – Comprehensive surveys for tests of theory

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February 17, 2003 Timothy D. Pike 5

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Overall Requirements for MACS

Maximize sensitivity

– Maximize flux on sample δE≈0.2 meV, δQ≈0.1Å-1 – Maximize detection solid angle at fixed Ef – Minimize background

Optimize performance for users

– Robust and reliable soft- and hard-ware – Standardized dynamic “finger prints” of sample – Versatility cannot compromise basic mode – Streamline experimental process

Start Commissioning in 3 years from now

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February 17, 2003 Timothy D. Pike 6

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Increase brightness at fixed neutron production

MACS Beam

New cold source installed in 2002 has increased flux by 1.8

K 45 / n/cm 10 8 . 4

2 13

= × =

eff

T s ϕ

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February 17, 2003 Timothy D. Pike 7

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Two Radial Collimators that Control energy resolution Two Radial Collimators that Control energy resolution Translating MACS Monochromator Translating MACS Monochromator Variable aperture that controls Q-resolution Variable aperture that controls Q-resolution Cooled Be, PG, and Al2O3 Cooled Be, PG, and Al2O3 Beam Shutter Beam Shutter

Overview of MACS

Design by T. D. Pike and C. Brocker

21 channel crystal analyzer 21 channel crystal analyzer super mirror guide channel super mirror guide channel

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February 17, 2003 Timothy D. Pike 8

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Incident beam filters

  • PG filter (8 cm)

– Order suppression at 13.7 meV and 14.7 meV – Fast neutron suppression E<15 meV

  • Be filter (10 cm)

– Order suppression E<5 meV – Fast neutron suppression E<5 meV

  • Sapphire filter (8 cm)

– Fast neutron suppression 15<E<20 meV

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February 17, 2003 Timothy D. Pike 9

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Collimators in series

A A

L d = α

LA

Nd

A

B B

L d = α

B

LA

B A B A B B eff

L L d α α α α α + = + ≈

A B

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February 17, 2003 Timothy D. Pike 10

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

1428 cm2 PG

5 cm f=4 m

Smee et al. (2002)

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February 17, 2003 Timothy D. Pike 11

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Incident Beam Line

  • Shielding Design of Incident Beam Portion of the

Instrument: MACS General Layout, MACS Monte Carlo

  • Beam Tube Design
  • Shutter Design
  • Cryo Filter Exchanger (CFX)
  • In-Line Collimator Exchanger (ICX)
  • Variable Beam Aperture (VBA)
  • Super-mirror Guide (SMG)
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February 17, 2003 Timothy D. Pike 12

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

v.1 Plan View

Drawing Courtesy of S. Smee

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February 17, 2003 Timothy D. Pike 13

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

v.3 Plan View 2

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February 17, 2003 Timothy D. Pike 14

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

Optimization

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February 17, 2003 Timothy D. Pike 15

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS Monte Carlo

Beam Optimization (Radius SMG)

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February 17, 2003 Timothy D. Pike 16

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

C-100 Perspective 1

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February 17, 2003 Timothy D. Pike 17

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

C-100 Perspective 2

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February 17, 2003 Timothy D. Pike 18

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

MACS Perspective

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February 17, 2003 Timothy D. Pike 19

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS Shutter

Plan View

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February 17, 2003 Timothy D. Pike 20

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Excel Spreadsheet Courtesy of C. Brocker

MACS Shutter Calculation Results

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February 17, 2003 Timothy D. Pike 21

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS Shutter

Perspective

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February 17, 2003 Timothy D. Pike 22

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Cryo Filter Exchanger (CFX)

Plan View Reference

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February 17, 2003 Timothy D. Pike 23

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Cryo Filter Exchanger (CFX)

Perspective

Complete Assembly Cut-Away View

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February 17, 2003 Timothy D. Pike 24

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

In-Line Collimator Exchanger (ICX)

Plan View Reference

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February 17, 2003 Timothy D. Pike 25

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

In-Line Collimator Exchanger (ICX)

Perspective 1

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February 17, 2003 Timothy D. Pike 26

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

In-Line Collimator Exchanger

Perspective 2

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February 17, 2003 Timothy D. Pike 27

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Variable Beam Aperture (VBA)

Plan View Reference

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February 17, 2003 Timothy D. Pike 28

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Variable Beam Aperture

Perspective

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February 17, 2003 Timothy D. Pike 29

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Super-mirror Guide (SMG)

Plan View Reference 1

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February 17, 2003 Timothy D. Pike 30

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Super-mirror Guide (SMG)

Plan View Reference 2

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February 17, 2003 Timothy D. Pike 31

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Super-mirror Guide (SMG)

Perspective 1

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February 17, 2003 Timothy D. Pike 32

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector

  • Detection System Shielding
  • Detector System Motion Control
  • Post Sample Filter Exchanger
  • Post Sample Collimator Exchanger
  • Double Crystal Analyzer Linkage
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February 17, 2003 Timothy D. Pike 33

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Twenty-one Channel Analyzer System

Design by C. Brocker

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BeO filter BeO filter Be filter Be filter PG filter PG filter Collimator 1 Collimator 1 8o vertically focusing Analyzer crystals 8o vertically focusing Analyzer crystals “TAS” detector “TAS” detector Energy integrating Detector Energy integrating Detector Design by C. Brocker Collimator 2 Collimator 2

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February 17, 2003 Timothy D. Pike 35

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector Shielding

Plan View 1

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February 17, 2003 Timothy D. Pike 36

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector Shielding

Plan View 2

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February 17, 2003 Timothy D. Pike 37

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector Shielding

Perspective

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February 17, 2003 Timothy D. Pike 38

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector Shielding Multiple Segments

Perspective 2

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February 17, 2003 Timothy D. Pike 39

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector Shielding Segment Construction

Perspective 1

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February 17, 2003 Timothy D. Pike 40

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector System Motion Control

Perspective

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February 17, 2003 Timothy D. Pike 41

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Detector System Motion Control

Plan View

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February 17, 2003 Timothy D. Pike 42

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Post Sample Cryo Filter Exchanger

Perspective Views

Illustrations Courtesy of JHU IDG

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February 17, 2003 Timothy D. Pike 43

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Double Crystal Analyzer Linkage

Precision Mechanism with 2 Theta Output Adaptation of Golovchenko Mechanism Shielding, Tolerances Life testing, Accuracy Testing, Neutron Beam Testing

  • Engineering Challenges
  • Design Approach
  • Optimization
  • What’s Next?
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February 17, 2003 Timothy D. Pike 44

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Monochromator Concept Basis

Figures 1 & 2 Repeated

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February 17, 2003 Timothy D. Pike 45

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Double Crystal Analyzer Linkage

Prototype Perspective 1

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February 17, 2003 Timothy D. Pike 46

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Double Crystal Analyzer Linkage

Prototype Perspective 2

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February 17, 2003 Timothy D. Pike 47

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Double Crystal Analyzer Linkage

Prototype Perspective 3

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February 17, 2003 Timothy D. Pike 48

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Double Crystal Analyzer Linkage

Prototype Perspective 4

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February 17, 2003 Timothy D. Pike 49

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

C-100 Perspective 2

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February 17, 2003 Timothy D. Pike 50

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

MACS General Layout

C-100 Perspective 3

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February 17, 2003 Timothy D. Pike 51

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

Special Thanks to

David K. Anand University of Maryland Paul C. Brand NIST Center for Neutron Research Dwight D. Barry NIST Center for Neutron Research Christoph Brocker University of Maryland / NIST Jeremy C. Cook NIST Center for Neutron Research Jeffrey W. Lynn NIST Center for Neutron Research Richard J. Mayti NIST Physics Laboratory Alastair MacDowell Advanced Light Source, LBNL Joseph D. Orndorff Johns Hopkins University Rupert Perera Advanced Light Source, LBNL Gregory Scharfstein Johns Hopkins University Ivan Schroder NIST Center for Neutron Research

  • S. A. Smee

University of Maryland Yiming Qiu Johns Hopkins University/ NIST Robert E. Williams NIST Center for Neutron Research Igor Zaliznyak Brookhaven National Laboratory

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February 17, 2003 Timothy D. Pike 52

MACS –a New High Intensity Cold Neutron Spectrometer at NIST

To Obtain a Copy of Today’s Presentation, Please Visit:

http://www.pha.jhu.edu /~broholm/MACS/

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February 17, 2003 Timothy D. Pike 53

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