Was Helium ever found in fusion reactors?

[Stanley514]

Some scientists have reported up to date success with such devices as tokamaks and Z-pinch
devices by reporting neutron radiation that they registered inside such reactors.It gives them hope to build such a devices as ITER for following fusion researches.
Meanwhile there have been overlooked such a fact that neutron radiation inside of reactors could be produced due to photonuclear reactions which are not exothermic and
not directly related to fusion.I think that only finding Helium in reactors could be a proof that nuclear syntesis is really going on there.
Do you know if any scientist EVER reported that Helium was found inside of experimental fusion reactors?

 

[Drakkith]

The amount of neutrons being detected from fusion devices is VASTLY more than what could possibly be produced by photodisintegration. The issue isn't whether fusion is being performed, its getting it to be performed efficiently.

 

[Stanley514]

The amount of neutrons being detected from fusion devices is VASTLY more than what could possibly be produced by photodisintegration.

From what sorces do you know it exactly?I could belive, but think such data could be easy to manipulate.Try to define number of photoreaction neutrons which could be or may not be...
Does not it seems strange to you that there is no widely know reports on finding Helium inside of tokamaks which could be the only UNDENIABLE proof of fusion reactions...

 

[Astronuc]

Photodisintegration of what - deuterons?

What is the threshold energy for photodisintegration of a deutron or a photoneutron from any other source?

What would be the source of such gamma energy?

 

[Stanley514]

Nueutrons also could form as result of collisions of relativistic electrons and ions.

 

[Astronuc]

Neutrons also could form as result of collisions of relativistic electrons and ions.

Thetypical ion or electron energy is on the order of 10 keV (10⁸ K). The ions coming from fusion have energies on the order to MeV, but quickly lose that energy to cooler ions. 1 to 10 MeV does not make for relativistic ions, and 10 or even 100 keV does not make for a relativistic electron.

So what would the source of MeV gammas required for photoneutron reactions, and what is the binding energy of neutrons in the various nuclei one might find in a fusion plasma?

 

[Stanley514]

If Helium was never found inside of TOKAMAKS there can`t be a fusion reactions.
If it was found why not to report it?

 

[phyzguy]

Of course the alphas are there, and they have been looked for and seen. Why would you think otherwise? See for example the attached reports from JET.

 

[Astronuc]

If Helium was never found inside of TOKAMAKS there can`t be a fusion reactions.
If it was found why not to report it?

Like this article - Alpha-Particle Diagnostics
http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/23/013/23013619.pdf

http://w3.pppl.gov/~ngorelen/Gorelenkov_PoP99_nlin.pdf

One can look for articles on "Tokamak, alpha particle"

 

[Drakkith]

From what sorces do you know it exactly?I could belive, but think such data could be easy to manipulate.Try to define number of photoreaction neutrons which could be or may not be...
Does not it seems strange to you that there is no widely know reports on finding Helium inside of tokamaks which could be the only UNDENIABLE proof of fusion reactions...

Widely known? To whom? The only people it will be widely known to are people that work in the industry, have an active part in it, or people that follow all of it closely for whatever reason they want. Unless you are one of those people then I doubt it would ever be widely known to you.