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HYSPEC IDT Meeting. SNS INSTRUMENTS OVERVIEW. R. K. Crawford Instrument Systems Senior Team Leader. September 10, 2004. The Spallation Neutron Source. The SNS will begin operation in 2006 At 1.4 MW it will be ~8x ISIS, the world’s leading pulsed spallation source

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HYSPEC IDT Meeting

SNS INSTRUMENTS OVERVIEW

R. K. Crawford

Instrument Systems Senior Team Leader

September 10, 2004


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The Spallation Neutron Source

  • The SNS will begin operation in 2006

  • At 1.4 MW it will be ~8x ISIS, the world’s leading pulsed spallation source

  • The peak neutron flux will be ~20–100x ILL

  • SNS will be the world’s leading facility for neutron scattering

  • It will be a short drive from HFIR, a reactor source with a flux comparable to the ILL


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Target Region Within Core Vessel

Target Module with jumpers

Outer Reflector Plug

Target

Moderators

Core Vessel water cooled shielding

Core Vessel Multi-channel flange


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Instrument Layout

SNS

SING

UNIV

NUC-PH

CANADA

Unfunded

11A - Powder Diffractometer –

SNS Funded –

Commission 2007

7 - Engineering Diffractometer –

IDT CFI Funded –

Commission 2008

6 - SANS –

SNS Funded –

Commission 2007

12 - Single Crystal Diffractometer –

DOE Funded (SING) –

Commission 2009

5 - Cold Neutron Chopper Spectrometer –

IDT DOE Funded –

Commission 2007

13 - Fundamental Physics Beamline –

IDT DOE Funded –

Commission TBD

4B - Liquids Reflectometer –

SNS Funded –

Commission 2006

14B - Hybrid Spectrometer –

DOE Funded (SING) – Commission 2011

4A - Magnetism Reflectometer –

SNS Funded –

Commission 2006

15 – Spin Echo

3 - High Pressure Diffractometer –

DOE Funded (SING) –

Commission 2008

17 - High Resolution Chopper Spectrometer –

DOE Funded (SING) –

Commission 2008

18 - Wide Angle Chopper Spectrometer –

IDT DOE Funded –

Commission 2007

1B - Disordered Mat’ls Diffractometer –

DOE Funded (SING) –

Commission 2010

2 - Backscattering Spectrometer –

SNS Funded –

Commission 2006


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Instrument Status

  • Final design review for 5 SNS Project instruments Sept 28-Oct 1

  • Installation has started

    • Evacuated scattering tank for backscattering spectrometer

    • Core vessel inserts

  • First 3 ready for commissioning April 2006

  • CNCS and ARCS progress review held in August – both scheduled for completion by end of FY2006

  • SNAP and SEQUOIA preliminary design review held in May – both currently undergoing baseline review and scheduled for completion in 2008

  • Other instruments in various stages of design




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Core Vessel Inserts

Core vessel inserts in various stages of fabrication and assembly


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SNS Component Development/Support

  • Data Acquisition System

  • Detectors

  • Neutron Choppers

  • Sample Environment

  • Analysis Software


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Data Acquisition

Satellite Computers:

Chopper, Sample Environment etc.

Preprocessor

Cluster

Chopper

Interface

Accelerator

Interface

Control Computer

External

Interfaces

Detector Electronics

Detectors

Soft Real Time

Fire Wall

File Server

Real Time

  • Basic hardware and software components for data acquisition all exist in prototype form. System design is standard to all instruments.

  • Integrated system demonstrated provided at April EFAC meeting


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Detector Selections

  • Reflectometers (2)

    • BNL 20 cm x 20 cm 3He Area PSDs

  • Backscattering Spectrometer

    • 15 cm x 1.3 cm 3He LPSDs

  • ARCS Spectrometer

    • 100 cm x 2.5 cm 3He LPSDs

  • Powder Diffractometer and VULCAN

    • LiF/ZnS scintillator screens coupled with wavelength shifting fibers and phototubes

  • SCD and MANDI

    • Anger camera scintillation detector

  • SNAP

    • Anger camera scintillation detector

  • SEQUOIA Spectrometer

    • 120 cm x 2.5 cm 3He LPSDs

  • CNCS Spectrometer

    • 3He LPSDs

  • SANS

    • 100 cm x 0.8 cm 3He LPSDs, 1 m x 1 m array


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Neutron Choppers

  • Fabrication and assembly of T0 chopper for powder diffractometer underway.

BW Choppers for Backscattering Spect.

  • Five 60-Hz bandwidth choppers have been delivered by Astrium, and have completed testing in the chopper lab at Argonne.

  • Second procurement for 60-Hz bandwidth choppers has been awarded to Revolve. These will be magnetic bearing choppers.


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Sample Environment Activities

  • Standards

    • Documented standards for sample environment mechanical interfaces to instruments

    • Communication protocols developed and standardized

    • Functioning communication system tested

  • Prototype development

    • Procuring several equipment items to develop sample holders, cryostat tails, etc

    • SBIR/STTR with Containerless Research, Inc to develop automated sample changing at low and high temperatures

    • Developing rapid-change refrigerator in collaboration with Penn State


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Sample Environment Activities – cont’d

  • Basic suite of general sample environment equipment will be procured in FY06-FY07 using operating budget

    • Inventory will be adequate to meet all needs for standard sample environments

    • Operating staff adequate to support needs for all operating instruments will be ramped up beginning in FY2005

  • Working with user groups to identify needs and pursue development of equipment for specialized sample environments

    • White paper and draft policy on magnetic field interference issues

    • Self-compensated high-field magnets


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Analysis Software

  • SNS is assuming an active role in the development of data analysis software

  • The NESSI workshop to document requirements for such software was held at SNS October 13-15, 2003

  • Draft requirements document prepared

  • SNS team leader for scientific computation (Steve Miller) on board

  • Preliminary implementation plan prepared

  • Extensive international collaboration

  • Part of team is already at work



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Summary

  • 16 instruments in various stages of design, procurement, and installation (5 of them in SING Project)

  • Common components infrastructure development is active – data acquisition, detectors, choppers, sample environment, analysis software

  • Starting to change staffing mix to support installation and operation

  • First instruments begin commissioning in 2006


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