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Topic: Aneutronic fusion


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  Fusion rocket
The advantage over a fission rocket is that less radiation is produced (depending on the fusion reaction), which requires less shielding, and that there is greater energy density in the fuel.
Of the speculative spacecraft propulsion systems that have been proposed, fusion is likely to be feasible in the medium term as steady progress is being made towards self-sustaining fusion reactions.
A small pellet of fusion fuel (with a diameter of a couple of millimeters) would be ignited by an electron beam[?], a laser or even a tiny amount of antimatter.
www.ebroadcast.com.au /lookup/encyclopedia/fu/Fusion_rocket.html   (431 words)

  
 Fusion rocket - Wikipedia, the free encyclopedia
For space flight, the main advantage of fusion would be the very high specific impulse, the main disadvantage the (probable) large mass of the reactor.
A small pellet of fusion fuel (with a diameter of a couple of millimeters) would be ignited by an electron beam or a laser.
In principle, the Helium-3-Deuterium reaction or an aneutronic fusion reaction could be used to maximize the energy in charged particles and to minimize radiation, but it is highly questionable whether it is technically feasible to use these reactions.
en.wikipedia.org /wiki/Fusion_rocket   (789 words)

  
 [No title]
The material in the fusion reactor will actually be less radioactive than some natural minerals, particularly uranium ores, and it would conceivably be safe to *recycle* the fusion reactor structure into a new fusion reactor, with little permanent waste at all.
Aneutronic fusion is much further down the road and would probably have a harder time competing economically.
Advanced aneutronic fuels in which only charged particles (i.e., not neutrons) are released by the fusion reaction would have an additional advantage: one can directly convert charged particle energy to electrical energy with much higher efficiency than one can achieve with conventional turbine-based technologies; this would reduce the thermal pollution from a fusion plant dramatically.
fusedweb.pppl.gov /FAQ/section2-energy/part2-enviro.txt   (1322 words)

  
 Science   (Site not responding. Last check: 2007-09-17)
The difficulty that long faced non-radioactive fuel fusion was that the helium-3 reactor requires ten times the temperature needed for conventional fusion (1 billion, as opposed to 100 million degrees centigrade).
Scientists from the Institute for Fusion Studies at the University of Texas presented the theory of stability of the focused self-collider in 1990.
Fusion experts from several leading Russian and U.S. institutes have concluded that, while not without risk, the aneutronic concepts are scientifically sound.
www.robertstanley.biz /science1.htm   (2546 words)

  
 Conventional Fusion FAQ Section 1/11 (Fusion Physics)
The conditions needed to induce fusion reactions are extreme; so extreme that virtually all natural fusion occurs in stars, where gravity compresses the gas, until temperature and pressure forces balance the gravitational compression.
The minimum mass needed to induce fusion is roughly one-tenth the sun's mass; this is why the sun is a star, but Jupiter is merely a (large) planet.
Fortunately for life on earth, the sun is an aneutronic fusion reactor, and we are not continually bombarded by fusion neutrons.
www.cs.uu.nl /wais/html/na-dir/fusion-faq/section1-physics.html   (4288 words)

  
 Aneutronic fusion - Z-fusion   (Site not responding. Last check: 2007-09-17)
Aneutronic fusion is potentially more economical than other sources of electricity because it releases energy in the form of charged particles which can be converted directly to electricity.
In contrast, fusion fuels like deuterium-tritium (D-T), which produce most of their energy in the form of neutrons, require a standard thermal cycle, in which the neutrons are used to boil water and the steam drives a large turbine and generator.
The second reaction could in principle be suppressed relative to the desired fusion by removing the high energy tail of the ion distribution, but this would probably be prohibited by the power required to prevent the distribution from thermalizing.
z-fusion.net /spip/spip.php?article61   (2204 words)

  
 Bogdan Maglich: Migma Fusion
So we do have fusion, but the only way we can prove that the fusion is coming from the migma is to demonstrate that the fusion rate obeys the basic law of colliding beams, the quadratic law, which states that the collision rate is proportional to the square of the beam intensity.
Last week, the Committee on Advanced Fusion Power of the National Research Council’s Air Force Studies Board issue a report advising the Air Force that research on aneutronic fusion processes is worth supporting as a possible answer to Air Force requirements both for electric current and for propulsion.
Proponents of aneutronic fusion say that to the DOE "advanced" means far in the future or even in the hereafter.
www.rexresearch.com /maglich/maglich.htm   (4686 words)

  
 Aneutronic fusion - Wikipedia, the free encyclopedia
Aneutronic fusion is any form of fusion power where no more than 1% of the total energy released is carried by neutrons.
Since the most-studied fusion reactions release up to 80% of their energy in neutrons, successful aneutronic fusion would greatly reduce problems associated with neutron radiation such as ionizing damage, neutron activation, and requirements for biological shielding, remote handling, and safety issues.
In contrast, fusion fuels like deuterium-tritium (DT), which produce most of their energy in the form of neutrons, require a standard thermal cycle, in which the neutrons are used to boil water, and the resulting steam drives a large turbine and generator.
en.wikipedia.org /wiki/Aneutronic_fusion   (3045 words)

  
 Thermonuclear rate coefficient for p--$^{11}$B reactions   (Site not responding. Last check: 2007-09-17)
B fusion rate coefficient based on numerical integration indicate that the overall error in these approximations is dominated by errors in the experimental measurement of the underlying p-
Analytic approximations to fusion rate coefficients have been developed for non-resonant cross-sections using the method of steepest descent [13,14] and for resonant cross-sections by approximating the resonance with a delta function [5,6].
B cross-section (by up to a factor of 1.6) might be obtained through spin polarization of the fuel ions [18]; while the rate at which electrons in the 100-200 keV energy range loose energy due to bremsstrahlung radiation is evidently a matter of some controversy [19,20,21].
epub.iaea.org /fusion/subscribe/40/apr/ms6818NevinW/6818.html   (2514 words)

  
 The Scientist : Letter: And Migma Facts
The article by Robert Crease about Bogdan Maglich and migma aneutronic fusion seems more like a gossip column than a scientific critique.
The temperature equivalent necessary for an aneutronic reaction is 100 times greater than that needed for thermal fusion.
If successful, migma promises virtually aneutronic (neutron-free and nonradioactive) energy with small-scale power plants that can be made as large as necessary by "stacking" (adding of migma modules).
www.the-scientist.com /article/display/9814   (278 words)

  
 Biology News: Lasers trigger cleaner fusion
The resulting fusion reaction is far cleaner than the kind currently being investigated to generate nuclear power.
But achieving this kind of laser-driven fusion in the lab will give scientists a better way to investigate the phenomenon, which could one day be used to create cleaner energy.
So some physicists have suggested using a different fusion process instead, which forces protons and boron nuclei together in a reaction that generates virtually no neutrons.
www.bioedonline.org /news/news.cfm?art=1979   (678 words)

  
 Fusion (Henry Spencer; Paul F. Dietz; Bruce Scott)
Also imagine the fear of bondholders in a utility that tried to build a tokamak, since that residual radioactivity is more than enough to render the core inaccessible to hands-on maintenance.
For aneutronic fusion you need p + B11 --> 3 alpha but B11 is exotic fuel and the cross section may be difficult (unfortunately, the NRP Plasma Formulary does not tabulate it).
>My strongest conviction about fusion is that I am absolutely certain >that if and when fusion becomes a practical source of cheap, clean, >abundant energy, All The Usual Suspects are going to be all over it >with "Fusion Kills" signs, chaining themselves to the gates, and >locking it up in the courts.
yarchive.net /nuke/fusion.html   (1034 words)

  
 Fusion (Gordon D. Pusch; Henry Spencer; Paul F. Dietz)
Truly aneutronic fusion tends to involve reactions like 11B+H, which is a lot more difficult.
The basic problem is that DT fusion releases most of its energy as neutrons.
The reaction is (4)He + (4)He + (4)He ---> (12)C + photon Such a three-particle fusion is much less probable than two-particle reactions, which is why the step from hydrogen burning to helium burning requires a great increase of temperature and pressure in a star.
yarchive.net /space/exotic/fusion.html   (1655 words)

  
 [No title]
Magnetic confinement uses the response of the plasma to magnetic field to compress it until the density and temperature are high enough for fusion to occur.
Of course collisions occur (and many per particle must occur in order to get lots of fusion, because collision cross sections are always larger than fusion cross sections), leading to "classical" (or when toroidal geometry is taken into account "neoclassical") transport of particles across the magnetic flux surfaces (and eventually out of the device).
Because fusion experiment and power plant designs rely on some amount of external heating and/or current drive power, one will never have (or ever need) true theoretical "ignition", that is Q=infintity, because the denominator P_in will never be exactly zero.
arstechnica.com /journals/science.ars/2006/3/20/3269   (1508 words)

  
 Conventional Fusion FAQ Section 1/11 (Fusion Physics)   (Site not responding. Last check: 2007-09-17)
Fusion as a Physical Phenomenon Last Revised August 7, 1994 Written by Robert F. Heeter, rfheeter@pppl.gov, unless otherwise cited.
[[ Hence "aneutronic." ]] > There are also other reactions that have multiple branches possible, > some of which do not produce neutrons and others that do > (e.g., D + D, p + Li7).
The first is getting the > fuel to smack together hard enough and often enough for fusion > to occur.
omicron.felk.cvut.cz /FAQ/articles/a1927.html   (4288 words)

  
 Cold Fusion At APS Meeting   (Site not responding. Last check: 2007-09-17)
This is the first time the APS has allotted time for presentations of matters concerning Cold Fusion.
The turnout at the hall where the cold fusion presentations were made had at most, forty in attendance which filled up not quite half of the room capacity.
It should be of historical interest as an event that happened, finally, for cold fusion.
www.padrak.com /ine/NEN_5_12_3.html   (360 words)

  
 Links on nuclear fusion - Z-fusion
Controlled fusion and plasma physics studies at the Institute of Nuclear Fusion of RRC "Kurchatov Institute"
The generation of fusion power from the Fast-Liner Reactor (FLR) concept envisages the implosion of a thin metallic cylinder onto a preinjected plasma.
Fusion with p11B has many advantages, including the almost complete lack of radioactivity and the possibility of direct conversion of charged particle energy to electricity, without expensive steam turbines and generators (Eric J. Lerner)
z-fusion.net /spip/spip.php?article55   (2379 words)

  
 [No title]
Thus, it is not fusion although some of the electric juice pumped in can go to forming a nuclear electron such as a muon and then by probability the muon may fuse some hydrogen together.
The concept of aneutronic fusion or aneutronic energy is mostly used in the engineering sense.
Actually, aneutronic fusion is *by definition* a *fusion* reaction which produces *no* neutrons.
www.ibiblio.org /pub/academic/physics/Cold-fusion/fd-latest/thruFD4458   (5154 words)

  
 [No title]
C. Fusion Research Review Articles & Texts D. Plasma Physics - General Texts (focus is on the science of plasmas, rather than engineering reactors) E. Plasma Physics - Device-Specific (applications of plasma physics to specific devices) F. Fusion Reactor Engineering References G. List of Relevant Scientific Journals H. Unclassified / Unsummarized works.
What follows is a listing of many, but not all, of the fusion energy/research information resources available via the internet.
The recent digest files are in subdirectories whose names begin with "fd," and the older stuff is archived by year in files fd89, fd90, etc...
www.ibiblio.org /pub/academic/physics/Cold-fusion/fd-latest/thruFD3782   (8667 words)

  
 makezine.com: A Fusion Reactor for the Rest of Us
Ed Storms is leading the effort to take cold fusion off the back burner by moving it into the garage.
The field of low energy nuclear reactions, historically known as cold fusion, has never had simple physical evidence of the claimed nuclear processes to physically place in the hands of doubters.
Using a unique experimental method called co-deposition, combined with the application of external electric and magnetic fields, and recording the results with standard nuclear-industry detectors, researchers have produced what may be the most convincing evidence yet in the pursuit of proof of low energy nuclear reactions.
www.makezine.com /03/interview   (1965 words)

  
 [No title]
Table I: Fusion Reactions Among Various Light Elements D+D -> T (1.01 MeV) + p (3.02 MeV) (50%) -> He3 (0.82 MeV) + n (2.45 MeV) (50%)
The best simple answer I've seen so far is this one: (I've done some proofreading and modified the notation a bit.) [ Clarifying notes by rfheeter are enclosed in brackets like this.] >From: johncobb@emx.cc.utexas.edu (John W. Cobb) >Risto Kaivola
wrote: [[ Sorry I don't have the date or full reference for this anymore; this article appeared in sci.physics.fusion a few months ago.]] >>Basically, what is aneutronic fusion?
fusedweb.pppl.gov /FAQ/section1-physics.txt   (4408 words)

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