OFFICE OF SCIENCE

The Making of the Spallation Neutron SourceThe Making of the Spallation Neutron SourceA 25-Year JourneyA 25-Year Journey

Patricia DehmerPatricia DehmerDeputy Director for Science Programs & Acting DirectorDeputy Director for Science Programs & Acting Director

Office of Science, U.S. Department of EnergyOffice of Science, U.S. Department of Energy

Download this talk at http://www.science.doe.gov/SC-2/Deputy_Director-speeches-presentations.htm

U.S.-Sweden First Joint Consultative Group MeetingU.S.-Sweden First Joint Consultative Group Meeting 21 April 200921 April 2009

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The 1984 “Seitz-Eastman Report” of the National Academy of Sciences The 1984 “Seitz-Eastman Report” of the National Academy of Sciences The first call for a pulsed spallation neutron source in the U.S.The first call for a pulsed spallation neutron source in the U.S.

The 1984 “Seitz-Eastman Report” (a.k.a., “Major Facilities for Materials Research and Related Disciplines”) presented priorities for new facilities.

The new facilities in order of priority were:

a 6 GeV synchrotron radiation facility (the Advanced Photon Source at ANL, commissioned in 1996);

an advanced steady state neutron facility (the Advanced Neutron Source at ORNL, terminated in 1995);

a 1 to 2 GeV synchrotron radiation facility (the Advanced Light Source at LBNL, commissioned in 1993); and

a high intensity pulsed neutron facility (the Spallation Neutron Source at ORNL, commissioned in 2006).

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Evolution of Machines for Neutron Beam ScatteringEvolution of Machines for Neutron Beam Scattering

FROM MATERIALS PROPERTIES … TO PROCESS AND FUNCTION

CourtesyJohn Axe & Sunny Sinha,

1997

Power requirements -- best guess at the time

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Spallation Neutron Source Primary ParametersSpallation Neutron Source Primary Parameters

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SNS Project Site — Spring 1999SNS Project Site — Spring 1999

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Rep.Wamp

Sec.Richardson

Vice Pres.Gore

Gov.Sundquist

Sen.Frist

Rep.Gordon

ORNL Dir.Trivelpiece

SNS Dir.Moncton

Rep.Duncan

Spallation Neutron Source GroundbreakingSpallation Neutron Source Groundbreaking15 December 199915 December 1999

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October 2000 October 2000

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October 2000, Site PlanOctober 2000, Site Plan

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March 2002March 2002

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August 2002August 2002

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August 2002August 2002

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November 2002November 2002

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~53% complete overall (including 94% of R&D, 85% of design, 39% of technical hardware, 46% of conventional construction, and 14% of installation)

~90% of planned procurements had been awarded

Intensive conventional construction activity on site and hardware fabrication by industry under contracts to the 6 Labs

Project staffed at plan (~ 650 FTEs including Labs and AE/CM, plus over 500 construction workers on site); staffing peaked in FY 2002

Outstanding safety performance while completing ~1.6 million construction hours

November 2002November 2002

A proton’s view of the target buildingfrom the exit of the ring tunnel

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June 2003June 2003

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June 2003June 2003

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April 2004April 2004

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The Spallation Neutron Source Today The Spallation Neutron Source Today

Linac TunnelLinac Tunnel

Looking toward the ion sourceLooking toward the ion source Looking toward the accumulator ring Looking toward the accumulator ring

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Inner Reflector Plug InstallationInner Reflector Plug Installation

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Overview of the TargetOverview of the Target –– 14 November 200514 November 2005Thom Mason, Jack Marburger, Jim Roberto

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Mercury Target ModuleMercury Target Module

Original target module has exceeded planned fluence goal (SNS power level is currently 700 kW) If target does not reach end of life by July 2009 shutdown, it will be removed to minimize impact on user program .

SNS Energy and Power on TargetSNS Energy and Power on Target

SNS – What’s Next?SNS – What’s Next?

1.1. Science outputScience output

2.2. Continuous technical improvementsContinuous technical improvements

SNS Instrument SuiteSNS Instrument Suite

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Instrument CommissioningInstrument Commissioning

4 instruments operating < 2008

10 currently operating

13 will be operational in 2009

All instruments are approved through a formal processAll instruments are approved through a formal process

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SNS Power UpgradeSNS Power Upgrade

Linac beam energy upgrade to 1.3 GeV by adding 9 superconducting cryomodules. Eventual increases in H- ion source beam, improvements in target module, and other upgrades.

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SNS Second Target StationSNS Second Target Station

New spallation target and supporting systems and buildings Initial suite of neutron beam instruments Cost in the $1B range

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The Spallation Neutron Source – The First 25 Years’ of the JourneyThe Spallation Neutron Source – The First 25 Years’ of the Journey