Preventing such contamination will be crucial to the development
of magnetic fusion energy.
The Princeton Plasma Physics Laboratory, funded by the U.S. Department of Energy and managed by Princeton University, is located at 100 Stellarator Road off Campus Drive on Princeton University's Forrestal Campus in Plainsboro, N.J. PPPL researchers collaborate with researchers around the globe in the field of plasma science, the study of ultra-hot, charged gases, to develop practical solutions for the creation
of magnetic fusion energy as an energy source for the world.
Not exact matches
The International Thermonuclear Experimental Reactor program in the south
of France will use
magnetic fusion and employ strong
magnetic fields to hold and fuse hydrogen plasma.
Also backed by the United States, Russia, China and Japan, ITER is the largest
of the various
fusion experiments underway and proposes to trigger
fusion using a super-conducting
magnetic compression process.
The breakthrough, he adds, has been an evolutionary one in the development
of the controls needed to manipulate the
magnetic fields to the temperatures (millions
of degrees) and pressures in which
fusion happens.
The Department
of Energy offers several research stints, including one at its
magnetic fusion facility at Lawrence Livermore National Laboratory in California.
After that I wanted to do something very practical so I switched to work on
magnetic confinement
fusion, as part
of the ongoing effort to develop
fusion reactors.
One
of the biggest ongoing projects is ITER in France, an international effort to build the first
magnetic fusion reactor that pumps out more energy than it consumes.
In a recent paper published in EPJ H, Fritz Wagner from the Max Planck Institute for Plasma Physics in Germany, gives a historical perspective outlining how our gradual understanding
of improved confinement regimes for what are referred to as toroidal
fusion plasmas — confined in a donut shape using strong
magnetic fields — have developed since the 1980s.
After decades
of slow progress with doughnut - shaped reactors,
magnetic fusion labs are gambling on a redesign.
Inertial confinement
fusion (ICF) seeks to create those conditions by taking a tiny capsule
of fusion fuel (typically a mixture
of the hydrogen isotopes deuterium and tritium) and crushing it at high speed using some form
of «driver,» such as lasers, particle beams, or
magnetic pulses.
On the other hand, in
magnetic field confinement
fusion plasma intended for a
fusion reactor, which research is being conducted at the National Institute for
Fusion Science, development
of high precision electron density measurements is becoming an important research topic.
Since the operating temperature for
fusion is in the hundreds
of millions degrees Celsius, hotter than any known material can withstand, engineers found they could contain a plasma — a neutral electrically conductive, high - energy state
of matter — at these temperatures using
magnetic fields.
Inertial confinement
fusion achieves this by crushing tiny capsules
of fuel with intense laser or
magnetic field pulses to achieve the required conditions.
That much current passing down the walls
of the cylinder creates a
magnetic field that exerts an inward force on the liner's walls, instantly crushing it — and compressing and heating the
fusion fuel.
Most
fusion research focuses on
magnetic confinement, using powerful electromagnets to contain a thin plasma
of hydrogen isotopes and heat it until the nuclei fuse.
For
magnetic fusion energy to fuel future power plants, scientists must find ways to control the interactions that take place between the volatile edge
of the plasma and the walls that surround it in
fusion facilities.
The breakthrough is in
magnetic confinement
fusion, in which hydrogen is heated until it is a plasma 10 times hotter than the centre
of the sun, and held in place by strong
magnetic fields until
fusion reactions occur.
In fact, some
of the more promising technologies involved with nuclear
fusion research use
magnetic fields to contain plasmas.
Aiming for the achievement
of fusion energy, research on confining a high temperature, high density plasma in a
magnetic field is being conducted around the world.
This model describes three types
of forces: electromagnetic interactions, which cause all phenomena associated with electric and
magnetic fields and the spectrum
of electromagnetic radiation; strong interactions, which bind atomic nuclei; and the weak nuclear force, which governs beta decay — a form
of natural radioactivity — and hydrogen
fusion, the source
of the sun's energy.
«The Department
of Energy sponsors all the
magnetic fusion research in the country.
(A tokamak is a kind
of magnetic donut that has proven to be a particularly stable way to confine the extremely hot plasma needed to achieve
fusion.)
Each
of these spinning
magnetic storms is the size
of Europe, and together they may be pumping enough energy into the solar atmosphere to heat it to millions
of degrees — a power that leads one scientist to suggest we could mimic these solar tornadoes on Earth in the quest for nuclear
fusion power.
American researchers have shown that prospective
magnetic fusion power systems would pose a much lower risk
of being used for the production
of weapon — usable materials than nuclear fission reactors and their associated fuel cycle.
He was elected a fellow
of the American Physical Society in 2013, with the APS citing his «innovations in
magnetic fusion issues» and «seminal contributions» to fields ranging from x-ray lasers to plasma - lithium interactions.
Through its efforts to build and operate
magnetic fusion devices, PPPL has gained extensive capabilities in a host
of disciplines including advanced computational simulations, vacuum technology, mechanics, materials science, electronics, computer technology, and high - voltage power systems.
Magnetic fusion energy and the plasma physics that underlies it are the topics
of ambitious new books by Hutch Neilson, head
of the Advanced Projects Department at PPPL, and Amitava Bhattacharjee, head
of the Theory Department at the Laboratory.
The books describe where research on
magnetic fusion energy comes from and where it is going, and provide a basic understanding
of the physics
of plasma, the fourth state
of matter that makes up 99 percent
of the visible universe.
Heliophysics plays out on scales ranging from the
fusion of subatomic particles taking place in the heart
of the sun to the grand sweep
of magnetic storms that can engulf entire planets.
There will also be lectures by top physicists and engineers that will offer a more in - depth look at the
magnetic fusion research taking place at PPPL and some
of the related projects.
Physicist Sam Lazerson
of the US Department
of Energy's Princeton Plasma Physics Laboratory has teamed with German scientists to confirm that the Wendelstein 7 - X
fusion energy device called a stellarator in Greifswald, Germany, produces high - quality
magnetic fields that are consistent with their complex design.
The concept uses a laser to heat
fusion fuel contained in a small cylinder as it is compressed by the huge
magnetic field
of Sandia's massive Z accelerator.
Dozens
of PPPL scientists presented the results
of their cutting - edge research into
magnetic fusion and plasma science.
A main goal
of tokamak research is to use
magnetic plasma confinement to develop the means
of operating high - pressure
fusion plasmas near stability and controllability boundaries while avoiding the occurrence
of transient events that can degrade performance or terminate the plasma discharge.
The cause, according to a theory advanced by PPPL physicist David Gates and colleagues at the Laboratory, lies in the tendency
of bubble - like islands that form in the plasma that fuels
fusion reactions to shed heat and grow exponentially — a runaway growth that disrupts the crucial current that completes the
magnetic field that holds the plasma together.
PPPL physicists contributed to papers, talks and presentations ranging from astrophysical plasmas to
magnetic fusion energy during the 58th annual meeting
of the American Physical Society (APS) Division
of Plasma Physics.
PPPL is the nation's leading center for the exploration
of plasma science and
magnetic fusion energy.
Originally proposed in a 2010 Sandia theoretical paper, the concept uses a laser to heat
fusion fuel contained in a small cylinder (called a liner) as it is compressed by the huge
magnetic field
of Sandia's massive Z accelerator.
The collaboration will study
fusion in a relatively unexplored intermediate density regime between the lower - than - air density
of magnetic confinement
fusion (MCF) that is studied at the ITER project in southern France, and the greater - than - solid density
of laser - driven inertial confinement
fusion (ICF) at the National Ignition Facility at Lawrence Livermore National Laboratory.
Heitzenroeder has contributed to the design and construction
of many
of the world's major
magnetic fusion facilities during a storied 40 - year career at PPPL that includes more than 20 years as head
of the Mechanical Engineering Division.
Researchers at the five - day conference, which ends Nov. 20, will attend nine half - day sessions featuring nearly 1,000 talks on subjects ranging from space and astrophysical plasmas to the challenges
of producing
magnetic fusion energy.
State -
of - the - art dynamic
magnetic resonance venography (MRV) and image
fusion to develop a specific picture
of the AVM, including its size and structure
Many
of the frontiers
of fusion science exist at the extremes
of the plasma state, a state
of matter where gases are hot enough that electrons disassociate from atomic nuclei (ions), forming an ensemble
of ions and electrons that can conduct electrical currents and be confined by electric and
magnetic fields.
The upgraded machine doubles the heating power,
magnetic field strength and plasma current relative to its predecessor, and increases the duration
of fusion experiments — or «shots» — to up to five seconds.
A secondary
magnetic field impedes energy from escaping from the ends
of the cylinder, which would lower the temperature
of the fuel and reduce the
fusion output.
Possible applications range from the dissipation
of magnetic energy in
fusion devices on Earth to the acceleration
of high energy particles in solar explosions called solar flares (Animation 1 and Image 2).
To Prof. John Holdren: I am a graduate student
of U.C. Berkeley doing thesis research on
magnetic fusion energy (MFE) at the DIII D tokamak in San Diego, CA.
While most characteristics
of a system tend to vary in proportion to changes in dimensions, the effect
of changes in the
magnetic field on
fusion reactions is much more extreme: The achievable
fusion power increases according to the fourth power
of the increase in the
magnetic field.
Importantly, this non-event should not bear any relation to the fate
of other vital work centering on an entirely different approach known as
magnetic fusion.