The single beam Cyclops laser at LLNL around the time of its completion in 1975. Cyclops was a high-power single-beam Nd:glass laser built at Lawrence Livermore National Laboratory (LLNL) in 1975 for the study of nonlinear focusing effects in high power laser beams, novel amplification techniques (disks of Nd:glass at the brewster angle), spatial filtering techniques which would be used on subsequent higher powered lasers such as the Argus and Shiva lasers and for inertial confinement fusion research. Aerial view of the lab and surrounding area. ...
Experiment using a (likely argon) laser. ...
Aerial view of the lab and surrounding area. ...
An illustration of the polaristion of light which is incident on an interface at Brewsters angle. ...
Argus laser overhead view. ...
The Shiva laser was an extremely powerful 20 beam infrared neodymium glass (silica glass) laser built at Lawrence Livermore National Laboratory in 1977 for the study of inertial confinement fusion and long-scale-length laser-plasma interactions. ...
Inertial confinement fusion using lasers rapidly progressed in the late 1970s and early 1980s from being able to deliver only a few joules of laser energy to a fusion target to being able to deliver tens of kilojoules to a target. ...
Even the earliest ICF laser experiments demonstrated that one of the main problems which needed to be addressed was poor focusing of the beams due to their extreme filamentation caused by the optical Kerr effect. Even slight imperfections in the Nd:glass amplifiers or other optics in the system could refract some of the light away from the beam centerline, resulting in bright and dark spots in the resulting image. In order to be useful in causing an effective implosion, the basic idea of ICF, the beam intensities would have to be extremely uniform and smooth. The Kerr effect or the quadratic electro-optic effect is a change in the refractive index of a material in response to the intensity of an external electric field. ...
A novel problem that became obvious as the lasers were scaled up in power were nonlinear phenomena that occur with very intense beams of light. LLNL's Krupke stated: - If the intensity of the light gets high enough —as in fusion lasers— the electric field in the light perturbs the atoms of the glass so strongly that the glass responds in a nonlinear way.
At the time there was no strong theoretical understanding of these effects, and predicting them was difficult. However, LLNL researches combined their own efforts with those of the commercial glass vendors and were able to develop new predictive tools. As Krupke noted: - It was like the Rosetta stone. With this quantitative correspondence, they were able to plot the nonlinear refractive performance of millions of glasses and find the one with the lowest possible value. We then worked with our industrial partners to make a composition with the characteristics we needed.
Although using the proper glass was able to reduce the problem as much as possible, the problem still existed. For smaller experiments this would not be enough of an effect to worry about, but with the much larger and more powerful Shiva already under design, some way of further improving the beam smoothness of the laser needed to be studied. The simplest way to eliminate these effects was to filter them out mechanically. Imaging spatial filters are, in effect, small inverted telescopes inserted in laser to focus the light through pinholes. Many of these imperfections would result in a very low angle of diffraction, however, so to improve the performance the laser is extremely long, thereby maximizing the distance the filaments moved from the centerline. Such a laser had not previously been built, the earlier Janus laser, which explored the Nd:glass laser itself, was only a few meters long. It was precisely the problems of building a long laser that Cyclops was built to study. Cyclops was effectively a single-beam of the larger Shiva design, one that could be completed as quickly as possible in order to identify potential problems and come up with the best arrangement for the filters. In this goal Cyclops was successful, and every major ICF effort since has used the spacial filtering technique, leading to ever-growing laser "beamlines" on the order of 100 m today. While Cyclops was still under construction, another LLNL laser was being built that also incorporated the spacial filtering technique, Argus. Argus passed its light through a series of amplifiers, with spacial filters between each stage. Argus laser overhead view. ...
See also
Experiment using a (likely argon) laser. ...
Aerial view of the lab and surrounding area. ...
An immense slab of continuous melt processed neodymium doped laser glass for use on the National Ignition Facility. ...
| | Atomic nucleus | Nuclear fusion | Nuclear power | Nuclear reactor | Timeline of nuclear fusion Plasma physics | Magnetohydrodynamics | Neutron flux | Fusion energy gain factor | Lawson criterion | | Methods of fusing nuclei | | | | List of fusion experiments | | Magnetic confinement devices ITER (International) | JET (European) | JT-60 (Japan) | Large Helical Device (Japan) | KSTAR (Korea) | EAST (China) | T-15 (Russia) | DIII-D (USA) | TFTR (USA) | NSTX (USA) | NCSX (USA) | Alcator C-Mod (USA) | LDX (USA) | PACER (USA) | H-1NF (Australia) | MAST (UK) | START (UK) | TCV (France) | DEMO (Commercial) The Sun is a natural fusion reactor. ...
A semi-accurate depiction of the helium atom. ...
The deuterium-tritium (D-T) fusion reaction is considered the most promising for producing fusion power. ...
A nuclear power station. ...
Core of a small nuclear reactor used for research. ...
Timeline of significant events in the study and use of nuclear fusion: 1929 - Atkinson and Houtermans used the measured masses of light elements and applied Einsteins discovery that E=mc² to predict that large amounts of energy could be released by fusing small nuclei together. ...
A Plasma lamp In physics and chemistry, a plasma is an ionized gas, and is usually considered to be a distinct phase of matter. ...
Magnetohydrodynamics (MHD) (magnetofluiddynamics or hydromagnetics), is the academic discipline which studies the dynamics of electrically conducting fluids. ...
neutron flux n : the rate of flow of neutrons; the number of neutrons passing through a unit area in unit time via dictionary. ...
The fusion energy gain factor, usually expressed with the symbol Q, is the ratio of fusion power produced in a nuclear fusion reactor to the power required to maintain the plasma in steady state. ...
In nuclear fusion research, the Lawson criterion, first derived by John D. Lawson in 1957, is an important general measure of a system that defines the conditions needed for a fusion reactor to reach ignition, that is, that the heating of the plasma by the products of the fusion reactions...
The deuterium-tritium (D-T) fusion reaction is considered the most promising for producing fusion power. ...
Magnetic Fusion Energy (MFE) is a sustained nuclear fusion reaction in a plasma that is contained by magnetic fields. ...
A split image of the largest tokamak in the world, the JET, showing hot plasma in the right image during a shot. ...
This article needs to be cleaned up to conform to a higher standard of quality. ...
Stellarator magnetic field and magnets A stellarator is a device used to confine a hot plasma with magnetic fields in order to sustain a controlled nuclear fusion reaction. ...
Reversed-Field Pinch is a toroidal magnetic confinement scheme. ...
A Field-Reversed Configuration (FRC) is a device developed for magnetic fusion energy research that confines a plasma on closed magnetic field lines without a central penetration. ...
A Levitated Dipole is a unique form of fusion reactor technology using a solid superconducting torus, magnetically levitated in the reactor chamber. ...
Inertial confinement fusion using lasers rapidly progressed in the late 1970s and early 1980s from being able to deliver only a few joules of laser energy to a fusion target to being able to deliver tens of kilojoules to a target. ...
In inertial confinement fusion (ICF), nuclear fusion reactions are initiated by heating and compressing a target â a pellet that most often contains deuterium and tritium â by the use of intense laser or ion beams. ...
The Z machine at Sandia National Laboratories in Albuquerque, New Mexico. ...
Bubble fusion or sonofusion is the common name for a nuclear fusion reaction hypothesized to occur during sonoluminescence, an extreme form of acoustic cavitation; officially, this reaction is termed acoustic inertial confinement fusion (AICF) since the inertia of the collapsing bubble wall confines the energy causing a rise in temperature. ...
U.S. Patent 3,386,883 - fusor â June 4, 1968 The FarnsworthâHirsch Fusor, or simply fusor, is an apparatus designed by Philo T. Farnsworth to create nuclear fusion. ...
Muon-catalyzed fusion is a process allowing nuclear fusion to take place at room temperature. ...
Pyroelectric fusion is a technique for achieving nuclear fusion by using an electric field generated by pyroelectric crystals to accelerate ions of deuterium (tritium might also be used someday) into a metal hydride target also containing detuerium (or tritium) with sufficient kinetic energy to cause these ions to fuse together. ...
Cold fusion cell at the US Navy Space and Naval Warfare Systems Center, San Diego, CA (2005) By definition, Cold fusion is a nuclear fusion reaction that takes place at or near room temperature and normal pressure instead of the millions of degrees required for plasma fusion reactions. ...
Experiments directed toward developing fusion power are invariably done with dedicated machines which can be classified according to the principles they use to confine the plasma fuel and keep it hot. ...
Cutaway of the ITER Tokamak Torus in casing. ...
Split image of JET with right side showing hot plasma during a shot. ...
JT-60 (JT stands for Japan Torus) is the flagship of Japans magnetic fusion program, run by the Japan Atomic Energy Research Institute (JAERI), and the Naka Fusion Research Establishment in Ibaraki Prefecture, Japan. ...
Categories: Stub | Nuclear technology ...
The KSTAR, or Korean Superconducting Tokamak Advanced Reactor is a magnetic fusion device being built at the Korea Basic Science Institute in Daejon, South Korea. ...
The Experimental Advanced Superconducting Tokamak (EAST, internally called HT-7U) is a project being undertaken to construct an experimental superconducting tokamak magnetic fusion energy reactor in Hefei, the capital city of Anhui Province, in eastern China. ...
The T-15 is a Russian nuclear fusion research reactor, based on the (Russian-invented) tokamak design. ...
DIII-D or D3-D is the name of a tokamak machine developed in the 1980s by General Atomics in San Diego, USA, as part of the ongoing effort to achieve magnetically confined fusion. ...
The Tokamak Fusion Test Reactor (TFTR) was an experimental fusion test reactor built at Princeton Plasma Physics Laboratory (in Princeton, New Jersey) circa 1980. ...
The National Spherical Torus Experiment (NSTX) is an innovative magnetic fusion device that was constructed by the Princeton Plasma Physics Laboratory (PPPL) in collaboration with the Oak Ridge National Laboratory, Columbia University, and the University of Washington at Seattle. ...
The National Compact Stellarator Experiment (NCSX) is a plasma confinement experiment being conducted at the Princeton Plasma Physics Laboratory. ...
Alcator C-Mod is a tokamak, a magnetically confined nuclear fusion device, at the MIT Plasma Science and Fusion Center. ...
The Levitated Dipole Experiment (LDX) is a project devoted to researching a type of nuclear fusion which utilizes a floating superconducting torus to provide an axisymmetric magnetic field which is used to contain plasma. ...
The PACER project, carried out at Los Alamos National Laboratory in the mid-1970s, explored the possibility of a fusion power system that would involve exploding small hydrogen bombs (fusion bombs)âor, as stated in a later proposal, fission bombsâinside an underground cavity. ...
The H-1 flexible Heliac is a three field-period helical axis stellarator located in the Research School of Physical Sciences and Engineering at the Australian National University. ...
The Mega Ampere Spherical Tokamak, or MAST experiment is a nuclear fusion experiment in operation at Culham since December 1999. ...
The Small Tight Aspect Ratio Tokamak, or START was a nuclear fusion experiment that used magnetic confinement to hold plasma. ...
The word demo may refer to one of the following. ...
Inertial confinement devices Laser driven: NIF (USA) | LMJ (France) | OMEGA laser (USA) | GEKKO XII (Japan) | ISKRA lasers (Russia) | Vulcan laser (UK) | Asterix IV laser (Czech Republic) | Nova laser (USA) | Novette laser (USA) | Nike laser (USA) | Shiva laser (USA) | Argus laser (USA) | Cyclops laser (USA) | Janus laser (USA) | Long path laser (USA) | 4 pi laser (USA) A construction worker inside NIFs 10 meter target chamber. ...
Laser Mégajoule (LMJ) is an experimental inertial confinement fusion (ICF) device being built in France by the French nuclear science directorate, CEA. Laser Mégajoule plans to deliver about 1. ...
The Laboratory for Laser Energetics (LLE) is a scientific research facility which is part of the University of Rochesters south campus, located in Rochester, New York. ...
The Nova laser was a laser built at the Lawrence Livermore National Laboratory in 1984 and which conducted advanced inertial confinement fusion experiments until its dismantling in 1999. ...
The Shiva laser was an extremely powerful 20 beam infrared neodymium glass (silica glass) laser built at Lawrence Livermore National Laboratory in 1977 for the study of inertial confinement fusion and long-scale-length laser-plasma interactions. ...
Argus laser overhead view. ...
Physicist Frank Rainer (inset), who was involved in laser research and development at LLNL since 1966, holds the target chamber seen at the center of the larger picture. ...
Non-laser driven: Z-machine (USA) The Z machine at Sandia National Laboratory. ...
See also: International Fusion Materials Irradiation Facility The International Fusion Material Irradiation Facility, also known as IFMIF, is an international scientific research program designed to test materials for suitability for use in a fusion reactor. ...
| External links http://www.llnl.gov/50science/lasers.html http://www.osti.gov/bridge/servlets/purl/16710-UOC0xx/native/16710.pdf http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1976lim..conf...18A&db_key=PHY&data_type=HTML&format=&high=44fac4eeaa06475 |