Questions tagged [fusion]

The fusion tag is used for questions about nuclear fusion, both the basic process at a physical level and it's use as a potential energy source.

Filter by
Sorted by
Tagged with
2
votes
1answer
105 views

Could one “build” elements?

I was wondering this: would it be possible to "construct" elements by arranging their constituent particles in high-energy environments? So apart from just fusion, could you sub-atomically manufacture ...
2
votes
2answers
73 views

Why does nuclear fusion not occur with nuclei with a nucleon number higher than 56? Please tell me if I am correct

Please tell me if my assumption is correct. So nuclear fusion does not occur with nuclei (with a nucleon number higher than 56) because the binding energy of the product nucleus is lower than the ...
2
votes
1answer
70 views

What can be learned from Wendelstein 7-x experiment?

This experiment achieved a stable plasma for 26 seconds. What do we learn from it in general(why it was done)? and specifically about the possibility of achieving positive energy flow ($Q>1 $) by ...
2
votes
1answer
61 views

Filling a flux surface in a tokamak or stellarator

Assume you have a magnetic confinement device like a tokamak or a stellarator. Let's assume further a configuration with closed magnetic field lines resulting in typical flux surfaces. If you now ...
2
votes
1answer
195 views

How long does it take for fusion to occur in a tokamak?

Once the plasma is in the tokamak reactor how long does it take until fusion starts to begin? I found that it must reach 150000000 degrees so, how long does it take for the plasma to reach this ...
2
votes
1answer
223 views

Nuclear Fusion Fuels

I have seen some possible fuels for nuclear fusion. My questions are: Are there other fuels available even theoretically or the list of candidates is limited? What are the requirements that a "...
2
votes
1answer
153 views

Can the lithium test be applied to differentiate brown dwarfs from other substellar objects?

The lithium test is often used to differentiate brown dwarfs from low-mass M-type dwarfs (see e.g. Martin et al. (1994)), because brown dwarfs (at least the lower-mass ones) do not burn lithium, ...
2
votes
1answer
1k views

Is man-made Carbon Fusion possible?

In a type Ia Supernova, the carbon accumulated in the earlier stages of a stars death fissues to create even heavier elements. Could this be used by humans aswell? Is it theoretically possible to ...
2
votes
1answer
786 views

How to initiate fusion explosion without a fission trigger

I'd like to know what theoretical methods for initiating a fusion detonation without a fission trigger exist, and which would be the most practical in the near future. I'd also like to know how small ...
2
votes
1answer
734 views

How does the internuclear repulsion vary in Hydrogenic atom collision?

Hydrogen fusion requires two hydrogen nuclei to get close enough (typically a few fm) to fuse. Much of the problem of creating a fusion reactor is overcoming the Coulomb repulsion between a pair of ...
2
votes
1answer
591 views

Do Hydrinos Exist? [duplicate]

Possible Duplicate: Have the Rowan University “hydrino” findings been replicated elsewhere? I came across this controversial company: Black Light Power I want to know if there is any ...
2
votes
2answers
82 views

Why is hydrogen-boron called a fusion reaction?

As we know, we usually call fusion such a reaction in which two light nuclei make a heavier one and release energy. For fission, a heavy nucleus breaks into light ones. My question is, in proton-boron ...
2
votes
1answer
96 views

How does binding energy work?

I do not have a very advanced understanding of binding energy and atomic mass but in my classes, I have learned that the atomic mass is equal to the sum of the number of protons and the number of ...
2
votes
1answer
629 views

Energy needed to overcome the coulomb barrier

I am in my first year of college and doing an EPQ type project on nuclear fusion and am wondering about Coulomb's Law. I am looking into the force experienced by a particle due to the Coulomb force ...
2
votes
2answers
168 views

Distinguishing an underground Hydrogen bomb test from a fission bomb explosion

A related question is Hydrogen bomb radiation output, but my question is based on the seismograph data (or any other data) possibly producing a distinctive pattern. Is it possible to tell the ...
2
votes
1answer
205 views

Can efficiency of fusor be improved by scaling up?

Fusors are very inefficient, among other reasons because the ions have to be decelerated and accelerated every time they fly out of the fusor, while radiating the energy out. However, what if we could ...
2
votes
1answer
228 views

What prevents high Beta plasma confinement and how to overcome it?

In order to confine a plasma, the plasma pressure is supposed to be lower than the magnetic pressure. The ratio of the plasma pressure to the magnetic pressure is called beta . Theoretically, the ...
2
votes
2answers
217 views

How do stars survive their own gravitational pull?

I read that stars burn hydrogen and helium to fight against gravity. How does burning something help against gravity?
2
votes
1answer
434 views

Does fusion continue to happen as a star collapses into a black hole (beyond our view)?

I know that we can't actually see a black hole form, because of time dilation, and we would see a frozen image just before the final collapse past the event horizon, slowly redshifting to nothing... ...
2
votes
1answer
296 views

Water behaviour under theoretical near-infinite pressure conditions

I've asked a similar question here but the answer given shows the behaviour of water under general conditions. I'd like to know what the behaviour of water is like as pressures increase towards ...
2
votes
1answer
166 views

Questions regarding the feasibility of “Jupiter”-like fusion reactor

I was reading this post from this website: Turning Jupiter into a star It basically talks about whether fusion can or does happen in the core of Jupiter. I know Jupiter cannot become a star, but I ...
2
votes
1answer
279 views

Why is plasma confinement on the NIF called inertial confinement when it appears to be confined by pressure?

I've heard that unlike Tokamaks that use magnetic confinement of the plasma, the NIF project uses 'inertial' confinement. What's inertial about it? Do they spin the plasma to use angular momentum like ...
2
votes
1answer
475 views

Why is the triple product nτT used instead of the individual three criteria?

Why is the criteria for fusion represented as a triple product nτT instead of the n,τ,T individually? i.e saying the density has to be above this value, temperature above this value? What are the ...
2
votes
1answer
130 views

Why is the D+T fuel inside a pellet in two distintic regions in fusion after compression

Could anyone explain why the D+T inside the pellet is in two distinct regions? And why the center is a lot less dense than the outside region? I have been trying to find answers online but i cant seem ...
2
votes
1answer
1k views

Help with Modeling a Liquid Vortex. (Related to General Fusion)

I want to model liquid lead swirling in a sphere. This is connected to General Fusion’s fusion machine. A 55 million dollar, Jeff Bezos funded, 60 person company trying to change the world with ...
2
votes
1answer
583 views

Calculating the minimum Lawson parameter for sustained d-d fusion

Calculate the minimum Lawson parameter for sustained deuterium-deuterium fusion in a plasma with an energy of 10 keV. I have been given the above question as part of a homework assignment and help ...
2
votes
2answers
2k views

What would happen if a hydrogen bomb were to explode in Saturn's atmosphere?

Purely hypothetical since any kind of testing in atmosphere/space is banned by international legislation/agreement. The humans have already bombed Luna so ... what could be expected to happen on ...
2
votes
0answers
42 views

Is the Marx Bank Still the Gold Standard?

Is the Marx bank still the fastest pulse forming network for generating high magnetic fields at large scale, or is there another design that outperforms it?
2
votes
0answers
53 views

Theorical efficiency of Chirped Pulse Amplification HB11 fusion reaction

I read that scientists finally reproduced a more efficient fusion with a novel approach. They accelerate hydrogen inside a pellet with a LASER. A single H atom produces three $\text{He-4}^+$ nuclei. ...
2
votes
3answers
122 views

Energy from fusion beyond iron peak

In the diagram of nuclear binding energy per nucleon Eb/A (vertical axis) and mass number A (horizontal axis), Fe-56 has one of the highest values. Many authors state that nuclear fusion can only ...
2
votes
0answers
103 views

Why is the D+P fusion reaction not considered for large-scale power production?

I know that D+D (fusion of deuterium + deuterium nuclei) as well as D+T (fusion of deuterium and tritium nuclei) are the reactions most commonly considered for large-scale power production. Why not D+...
2
votes
0answers
374 views

Does a fusor emit dangerous radiation?

I noticed some online videos where people have built these things in their house or garage. Is it dangerous to do so? The high voltage appears to be a potential hazard, but what about radiation -- ...
2
votes
0answers
21 views

How to calculate the life expectancy / fusion rateof a star? [duplicate]

If I have the mass (and if needed, the atomic mixture) of a star before it forms, is there some mathematical way to calculate how fast the star will burn through its contents and die?
2
votes
1answer
72 views

Would $^3_2\mathrm{He}$ and $^3_1\mathrm{H}$-based fusion require different fusion reactors?

At school I have learned that there are two very similar fusion reactions, which physicists (and science fiction authors) hope can be used as an energy source: $$^2_1\mathrm{H}+^3_1\mathrm{H} \...
2
votes
0answers
94 views

What is wrong with particle acceleration based fusion? [duplicate]

Recently, I was thinking about fusion and this thought struck my mind. In tokamaks, the plasma is heated to extremely high temperatures in order to supply enough energy to the ions for them to fuse. ...
2
votes
0answers
59 views

Why is there a mass defect in nuclear fusion? [duplicate]

So I'm currently trying to wrap my head around nuclear fusion, but there is something that keeps bugging me: I've read in many places that when two hydrogen atoms combine, the resulting helium atom ...
2
votes
0answers
44 views

How much more mass would Jupiter have to accrete to start fusion? [duplicate]

How long would it take? Is it likely in the life of our sun?
2
votes
0answers
249 views

Usage of rare earth barium copper oxide (ReBCo) superconductors (for fusion reactors)

Recently, scientist from MIT have proposed a new design for a compact fusion reactor, see for example this ArXiV paper. I do not want to discuss the physics of their reactor but am more interested in ...
2
votes
0answers
42 views

Could anyone explain to me how the products of nuclear fusion/fission are predicted? [duplicate]

I have an idea of how quantum mechanics work, but I know too little to understand which products are a result of certain reactions like bombarding a certain atom with neutrons or just by natural decay....
2
votes
0answers
255 views

Nuclear fusion ignited by neutron capture

Does anybody know if there was some attempt to make a hydrogen (fusion) bomb using neutrons released from the fission primary? e.g. using $^{10}\text{B}$ hydrate as a fuel? Assuming reaction $$^{10}\...
2
votes
2answers
527 views

Why does a coulomb explosion induce fusion?

If you strip the valence electrons apart with a very short intense electromagnetic field the remaining core explodes in a so called coulomb explosion. But experiments have shown that under certain ...
2
votes
3answers
1k views

Does energy conservation not hold in fission and fusion processes?

I have read that during fission and fusion processes, there is some kind of equilibrium between the single nucleus and the disintegration products, so they are constantly being converted into each ...
2
votes
1answer
85 views

Ultra Cold Neutrons in a Bottle Question

If you take a large amount of ultracold neutrons and confine them in a bottle would they then decay into protons and then fuse because they are so tightly condensed that the protons, once neutrons, ...
1
vote
5answers
3k views

Could we use nuclear bombs to generate electricity? [closed]

it seems the biggest problem with fusion power is confinement. on the other hand, we developed a fusion bomb in just a few years. i was wondering if it could be economically viable to use nuclear ...
1
vote
4answers
2k views

Requirements for hydrogen fusion

What are the requirements for hydrogen atoms to go through fusion? Is it a ratio of heat to pressure or are there specific heat and pressure values that must be met (per atom or per mole?) Are there ...
1
vote
2answers
114 views

Explain to me why the following reaction can happen in big stars but not on earth

$$ \rm {}^{12}C +{}^{12}C\rightarrow {}^{20}Ne + {}^4He $$ why doesn't this reaction occur on earth? but occurs in big stars?
1
vote
1answer
91 views

Why is humanity investing so little on fusion research? [closed]

Optimists expect fusion industry to be a reality in 2080 to 2100. Fusion means clean and unlimited amount of energy, it is the fuel of the universe. Fusion will solve most of our time problems ...
1
vote
2answers
2k views

What is the role of plasma in nuclear fusion energy production?

I read that confined plasma in electromagnetic field uses in TOKAMAK nuclear fusion reaction. But I don't know what is the main role of plasma in fusion reaction. Is it use for producing energy ...
1
vote
2answers
238 views

Lead catalyzed fusion

Consider the following setup: A beam of deuterons is accelerated towards a lead target. With sufficient acceleration (in the MeV range, nothing fancy...), I would expect some of the deuterons to fuse ...
1
vote
1answer
373 views

Why Hydrogen bomb is called “Thermonuclear Bomb”?

Why do we call Hydrogen bomb as "Thermonuclear Bomb" ?

1
3 4
5
6 7
10