SNS completes full neutron production cycle at record power level

August 9, 2018 by Jeremy Rumsey, Oak Ridge National Laboratory, Oak Ridge National Laboratory
As protons (yellow) strike the target vessel and pass into the liquid mercury inside, the protons are absorbed, creating neutrons (blue) that are then sent through moderators and beam tubes to research instruments to study the fundamental properties of materials. Credit: ORNL/Jill Hemman

The Spallation Neutron Source at the Department of Energy's Oak Ridge National Laboratory has reached a new milestone by operating a complete neutron production run cycle at 1.3 megawatts.

Achieving the record power level with a remarkable 94 percent accelerator beam availability establishes a new baseline of operation as well as a path to operate reliably at higher powers. Increased power offers researchers the ability to conduct faster scientific analyses using neutrons on more types of materials.

SNS, a DOE Office of Science User Facility, began operations in 2006 and is currently the world's most powerful pulsed accelerator-based neutron scattering facility, used by scientists to reveal fundamental properties and behaviors of energy and materials at the atomic scale. Neutron contributions at SNS have resulted in advances in electronic devices, improved drug delivery, and stronger building materials for transportation infrastructure.

The facility accelerates protons at nearly 90 percent the speed of light down a linear accelerator and into a ring that compresses the proton pulse by a factor of 1,000. The protons collide with a liquid mercury , which creates a "spall" of neutrons that flow to powerful instruments where scientists measure the neutrons' interactions with a variety of materials.

Continuous and reliable operations at 1.3MW during SNS's latest 12-week production cycle were enabled by a more robust stainless-steel target module and a series of improvements in the accelerator systems that allowed higher proton current and energy. SNS has reached power levels as high as 1.4 MW, but this is the first time the facility has sustained levels as high as 1.3MW over a predicted timeframe.

Oak Ridge scientists and engineers have extended the lifetime of SNS targets by studying the performance of previous targets and making adjustments such as the injection of small bubbles of helium gas into the target vessel's liquid mercury flow—an improvement that reduces the impact stresses caused by the beam.

In 2016, SNS implemented a Target Management Plan to capture performance data and incorporate design improvements in new targets, which are currently installed approximately three times a year. Since the plan's implementation, each target has performed reliably according to its intended design.

As planned, SNS will operate the next production cycle at 1.4MW.

Explore further: Leading the way: ORNL builds more reliable, longer-lasting targets for high-powered neutron scattering

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Eikka
not rated yet Aug 09, 2018
A stable and powerful neutron source can run a subcritical nuclear reactor that burns up nuclear waste into energy, yet can be turned off at the flip of a switch.

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