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.

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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 ...
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'Forces' enacted by hot neutrons in fusion bomb - Pauli exclusion

Are Pauli exclusion 'forces' on a neutron 100% electromagnetic (Lennard-Jones seems more acute relationship compared to electrostatic force) If so does that neutrons have two forces between them - '...
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Can the fusion of deuteron-like nuclei form a new type of periodic table

In late 2019, The Indian Lattice Gauge Theory Initiative, theorized the existence of exotic particles, "which can be formed through the fusion of heavy baryons, similar to the formation of nuclei of ...
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How do we know fusion energies?

Crucial to our understanding of stellar evolution is the energies involved in nuclear fusion reactions. How do we know those energies? How do we know which fusion reactions take place, at which ...
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Nuclear Fusion and Quantum Annealing

This is a pie in the sky idea, and a problem finding sort of question that can probably be dismantled easily, but in light of alternative energy needs with climate change, I think it would be ...
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Do the MHD equations break down under certain circumstances (and possible connection to fusion experiments)?

The Euler equations produce singularities (in finite time) under certain conditions see here.  When rings of fluid approach each other,  in certain simplified scenarios,  the Euler equations that ...
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Can artificial fusion have the same power density as in Sun's core?

I recently read about solar core, and found that the power density is only 276.5 watts per cubic meter. This seems rather low to me, but on the other hand the Sun is an enormous object, so the total ...
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Evolution of red dwarf stars

While low mass stars (initial mass approximately $0.1 M_\odot$ to $0.8 M_\odot$) are quite numerous, their evolution seems to draw relatively little attention. The lower central density and ...
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Why do later fusion stages in a star last shorter?

When most of the hydrogen in the core of a massive star has fused to form helium, the next fusion stages (helium, carbon, neon, oxygen, ...) produce less and less energy in a single fusion reaction. ...
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104 views

Is it possible to create nuclear fusion using a simple electric arc discharge?

If we have a simple discharge tube filled by deuterium gas or even heavy water, and put tungsten electrodes close to each other to create a huge electric field, then using a megavolt generator to ...
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86 views

What is the largest obstacle in practical helium-3 fusion? [closed]

I've been busy looking into clean, sustainable energy solutions (for a project) I ran into He-He fusion of the isotope He-3, and most of it looks more beneficial than the traditional D-T fusion due ...
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What is the force at play in the emission of neutron out of Helium-5

On nuclear fusion, Wikipedia reads (about Tritium-Deuterium fusion): The (intermediate) result of the fusion is an unstable 5He nucleus, which immediately ejects a neutron with 14.1 MeV. The recoil ...
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Heavy elements creation [duplicate]

Would elements heavier than iron not be extremely rare if only created by supernovae? I believe all elements above hydrogen are created in the star's corona. Hydrogen fusion is not possible in star's ...
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Why this arrangement of thingys in this light-induced fusion reactor?

Here is a photo from inside a light-induced fusion reactor at the National Ignition Facility, California. Image source: Wikipedia I'm not sure what those thingys all around it are but I assume they ...
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Hydrogen bomb without fission stage

The majority of existing nuclear warheads are Thermonuclear devices implementing the Teller--Ulam design. It includes a first stage of "traditional" nuclear fission explosive (Uranium and/or Plutonium)...
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Spherical Electromagnet Formed By Six Coils For Plasma Containment and Nuclear Fusion [closed]

Several years ago I have proposed an open source spherical magnetic vessel to contain plasma for nuclear fusion which can be seen by following this link. A photo of it is seen below. A question here ...
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Do elastic collisions occur if a part of the plasma is heated to fusion conditions?

Consider you have a plasma, and then you use a laser to heat it so that the part of the plasma that the laser went through is heated to 150 million degrees. The rest of the plasma temperature is not ...
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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 ...
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Nuclear fusion using electromagnetic fields

I was just thinking about how deuterium and tritium are charged particles and so I couldn't help but wonder why we don't use the same process used in the LHC(electromagnetic fields to accelerate ...
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Can another element “burn” at the same rate as hydrogen does in our sun?

From what I understand our sun doesn't actually "burn", instead a nuclear reaction is taking place, which is the cause of heat, light and a electromagnetic radiation. I believe this is called Hydrogen ...
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Why is this reaction considered a nuclear fusion when the daughter isotope has a nucleus with the same mass?

I understand that in nuclear fusion, the colliding particle unites with the parent and fuses into a single nucleus with a higher mass. Sometimes other small particles (n, p) are given off. However, ...
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Is first light fusion solution possible to work?

This company is running a project with extremely high pressure and low temperature https://firstlightfusion.com/technology/#our-approach Their idea is roughly by using a railgun, accelerate a ...
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How does the Sun provide enough energy to fuse protons?

Given that the sun’s temperature is lower than the temperature needed to fuse two protons. How does the sun provide enough energy for this fusion to happen? Has it do something with tunneling and $E =...
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Fusion in Sun's core [duplicate]

I was reading nuclear physics in which it was mentioned that the coulomb barrier for proton is 400keV corresponding to a temperature of 3 billion Kelvin.I want to know then how does nuclear fusion ...
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If planet like Jupiter is massive enough to hold hydrogen with its gravity is it bound to become a star?

I have been reading about Jupiter as of late and reason I am asking is if Jupiter has strong enough gravity to pull hydrogen to itself then it should be only matter of time when it will acquire enough ...
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Is a dipole fusion reactor feasible?

It is well known that the earth's dipole-like magnetic field is able to confine charged particles to paths that spiral along the field lines. That's why we have auroras and the Van Allen radiation ...
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Discussion about a new nuclear fusion design [duplicate]

this company is running a similar project described below. https://firstlightfusion.com/technology/#our-approach Let me clarify here, this is not cold fusion. D&T gas will be compressed very ...
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Does fusion only occur with ions?

In nuclear fusion, the particles require enough energy to overcome the Coulomb barrier. The Coulomb barrier is caused by the Coulomb force, which is created by the protons repelling each other because ...
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How are thermonuclear weapons possible?

Given the fact that thermonuclear devices are a mix of fission through enriched uranium whose energy initiates the fusion in surrounding deuterium. Question is (how come) fission raises temperature so ...
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NAS report on fast ignition

I'm looking for a paper, or much more likely a small part of a large report, by the National Academy of Sciences from around 2013 on the topic of fusion. The report mentions the fast ignition approach ...
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Is gravity a factor for sustaining fusion?

Does gravity affect a Fusion reactors ability to sustain a reaction? If so has there been any experiments done or planed for in space? Holding / maintaining shape might be a lot easier with less ...
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Is a chain fusion reaction of deuterium oxide (heavy water).possible?

I think it is the case that at very high temperatures that two deuterium atoms can be made to fuse to produce helium and a release of energy. I think under appropriate physical conditions this can ...
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Calculation of number of nuclear fusion reaction per cubic meter or kilo

In wikipedia article about Nuclear fusion there is a list of nuclear fusion reaction here. Is there a equation how to calculate number of nuclear fusion reaction per second per cubic meter or per kg ...
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How would I go about calculating the energy input needed for a cyclotron reactor?

I'm trying to do some math regarding cyclotron reactors. I've figured out how to calculate the radius of a particle's motion in the cyclotron, a rough way to calculate energy output, but I have looked ...
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Why can't Iron fusion occur in stars?

It is said that iron fusion is endothermic and star can't sustain this kind of fusion (not until it goes supernova). However star is constantly releasing energy from fusion of elements like Hydrogen ...
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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 ...
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A question about fusion and fission

https://www.youtube.com/watch?v=yTkojROg-t8 1) Watch till 0:20 "Then the binding energy is the amount of energy that takes to completely separate them" But the gravitational force between 2 masses ...
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Any way to definitively determine the products of deuterium-deuterium fusion?

I was doing some reading and came across these two reactions: $D + D \rightarrow \:^3He + n + 3.27 MeV$ and: $D + D \rightarrow \:^3H + H + 4.03 MeV$ (from here: http://hyperphysics.phy-astr.gsu....
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How is the energy output released in a proton-proton fusion reaction?

$$\rm p + p \to {}^2H + e^+ + v_e$$ The net energy output for this reaction, not including the electron-positron annihilation that likely would occur, is 0.423 MeV - according to my math and sources ...
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Is there a mathematical model for predicting when gamma rays are produced in radioactive decay?

My understanding of gamma ray emission from radioactivity is that the daughter particle is in an excited state, which then produces a gamma ray as the electron drops energy levels. In the case of ...
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Is high temperature **required** for nuclear fusion?

Tl;dr: Can fusion be achieved only by speeding up particles to high enough speeds to smash into each other? I know that it is necessary for protons, or any oppositely-charged particles for that ...
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Can nuclear fusion alone account for the energy output from type 1a supernova?

Unlike other supernova, which can vary in their size, Type Ia supernova are all about the same size. This is due to the fact that they are caused when a white dwarf star gains enough mass from its ...
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Could you use the detonation of a Hydrogen bomb or atomic bomb to start a nuclear fusion reactor [closed]

Would this lead to a reactor that produced more energy than you put in?
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How does the $p+p + e^-\rightarrow D + \gamma\gamma+ \nu$ reaction proceed in the sun?

In this video on nuclear fusion the explanation of the reaction $p+p\rightarrow D + \nu + \gamma\gamma$ is that the two protons collide, form a weakly bound state, and then sometimes decay into the ...
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How To Simulate Muon Induced Nuclear Fusion?

I am familiar with euler-lagrange equations which can be used to simulate a mechanical system, something like an inverted pendulum on a cart. How can I simulate a volume of deuterium and tritium with ...
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Is relativistic channeled electron catalyzed fusion possible?

A few words first  about muon catalyzed fusion.  You can see this question sigoldberg1 answer, and  this link. "The muon may bump the electron from one of the hydrogen isotopes. The muon, 207 ...
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Has proton-proton fusion ever been seriously considered for an artificial fusion reactor?

All contemporary efforts to perform nuclear fusion as a source of power have focused on reactions between isotopes (often deuterium, tritium, or He3) and/or light elements (often boron or lithium ...
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Why can't we harness the energy from neutron + protium = deuteron reaction?

The answer to this physics se question, established that 2.2Mev (Mega electron volts) of energy is emitted as a gamma ray photon when the hydrogen atom nucleus oka protium absorbs a slow moving free ...
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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, ...
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Tuning Drifts in Tokamaks

If we managed to make over 50 % of the drifting of the guiding centers of the gyrating particles inside a tokamak to occur into the inwards direction, away from the tokamak walls, would that allow us ...