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Steven Cowley, newly named director of the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) effective July 1, has received a knighthood from Queen Elizabeth “for services to science and the development of nuclear fusion.”
Now known formally as Sir Steven Cowley, he previously was chief executive of the United Kingdom Atomic Energy Authority (UKAEA) and director of the Culham Centre for Fusion Research, and most recently was president and professor of physics at Corpus Christi College at Oxford University.
“Princeton is truly delighted that Steve is coming to lead the Lab,” said Dave McComas, Princeton University Vice President for PPPL. “His contributions earlier in his career in the U.S. and then more recently in Europe have been stellar and we are counting on him to lead PPPL to new heights.”
AGNI Energy borrows elements from each of these fusion methods for use in their device. AGNI focuses a beam of ions, which is half of the fuel, onto a solid target which is the other half of the fuel.
To focus and control the beam in a way that is scalable, this reactor uses both electric fields and magnetic fields. Unlike the typical magnetic confinement, these ions have a very short flight time before they hit the target, so the ions don’t need to be controlled very long before the fusion occurs.
Rather than just squeezing the plasma, which is like grabbing smoke with your hands, they just fire it straight at the target, using some interesting quirks of physics to boost its energy on the way there. With this approach, AGNI may overcome the hurdles and eventually reach breakeven fusion.
Hopkins and Thomas’ design was originally based on an inertial design of nozzle fusion, but altered to replace the negative electrode with a solid state fuel target. Magnetic ring confinement increases particle energy and density at the target. This process was originally tested with heavy-water ice in a small inertial design, and ran for about 10 minutes.
The AGNI reactor uses several types of fusion fuel in order to take advantage of different energies and the fusion-ion heating of aneutronic fusion, in which neutrons carry only about 1% of the total released energy, as opposed to 80% in traditional fusion reactions. Successful aneutronic fusion would greatly reduce problems associated with high neutron radiation such as ionizing damage, neutron activation and requirements for biological shielding and safety. The amount of waste is also greatly reduced even for fusion.
In this reactor, the ion beam contains a mixture of deuterium and helium-3, deuterium being the dominant component of the beam. The target plate contains Lithium-6, Tritium, and Boron-11. Because of pre-target fusion, there are more final products interacting with the target plate then Deuterium and Helium-3. Of note, Deuterium—Helium-3 fusion produces protons that can then fuse with the Boron-11 to produce three Helium-4 ions (see figure).
It included images of the compact fusion reactor, an effort Lockheed acknowledged five years ago to develop a breakthrough nuclear powerplant. But Lockheed officials have said ongoing tests on a series of subscale prototype reactors won’t produce data needed for a go-ahead decision until later this year or next year.
“First experience with the new wall elements are highly positive”, states Professor Dr. Thomas Sunn Pedersen. While by the end of the first campaign pulse lengths of six seconds were being attained, plasmas lasting up to 26 seconds are now being produced. A heating energy of up to 75 megajoules could be fed into the plasma, this being 18 times as much as in the first operation phase without divertor. The heating power could also be increased, this being a prerequisite to high plasma density.
... At an ion temperature of about 40 million degrees and a density of 0.8 x 10^20 particles per cubic metre Wendelstein 7-X has attained a fusion product affording a good 6 x 10^26 degrees x second per cubic metre, the world’s stellarator record.
Summit is the new jewel in the crown for US supercomputing, succeeding the Titan supercomputer that was the most powerful machine in the world five years ago, with 27 peak petaflops and currently ranked seventh in the world. But Summit is targeting 200 peak petaflops of performance at 13 megawatts of power for traditional HPC simulations and more than 3 exaflops for machine learning codes, which should make it the fastest and smartest supercomputer in the world. It’s the US answer to China’s Sunway TaihuLight.
Summit is being built by IBM, Nvidia, and Mellanox Technologies for the DoE’s Oak Ridge Leadership Computing Facility (OLCF). Just like Titan, Summit is a hybrid CPU-GPU system, with 4,608 nodes with two IBM Power9 processors and six Nvidia Volta V100 GPU accelerators per node – you can see the performance benchmarks in the chart below. The supercomputer will have a large coherent memory of over 512 GB DDR4 and 96 GB HBM per node, all directly addressable from the CPUs and GPUs, and an additional 1600 GB of NVRAM, which can be configured as either burst buffer or as extended memory.