AW: [ RadSafe ] Tokomak, Fusion, etc.

[Franz Schönhofer]

Joe and all the other RADSAFErs who answered my request and gave links and
information: Thank you!!! I will need a few days to check all these links
and informations, but it is already now clear that I got the informations I
asked for. 

Joe, I would never dare to "demand" anything from RADSAFE, my probably wrong
feeling of the English language would rather characterice my question as a
very humble inquiry.....

Of course my inquiry was directed to the various comments of "I think", "I
believe to remember" etc., not excluding myself. We need facts (!!!) to
discuss and not hearsay.

Best ragards and thank you again!

Franz


Franz Schoenhofer
PhD, MR iR
Habicherg. 31/7
A-1160 Vienna
AUSTRIA
phone -43-0699-1168-1319


> -----Ursprüngliche Nachricht-----
> Von: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] Im
> Auftrag von JPreisig at aol.com
> Gesendet: Donnerstag, 30. Juni 2005 02:10
> An: radsafe at radlab.nl
> Betreff: [ RadSafe ] Tokomak, Fusion, etc.
> 
> Hmmmmmm,
> 
>      This is from:    jpreisig at aol.com     .
> 
>       Howdy Radsafers,
> 
>            As usual, Franz is the demanding one and wants to hear about
>       tokomaks, fusion and the like.  OK, I will try to comply briefly.
>       A fairly recent book with fusion discussions is Emilio Segre's book
>       on Nuclear  and Particle Physics.
> 
>            Tokomaks are ring-like structures (a torous or donut shape)
> which
> use magnetic fields to contain the eventual hot plasma gas.  The NSTX at
> Princeton
> (PPPL) is like a tokomak whose outside radius has been shrunk so that
> the donut shape approaches a more spherical torous shape.
> 
>           The basic fusion reactions are deuterium on deuterium and/or
>    deuterium on tritium.  The second reaction produces 15 MeV
>    neutrons.  These 15 MeV neutrons can interact with the fusion reactor
>    assembly (metals and other materials) and neutron activate such
>    materials.  Such neutron activation is described in the book
> Accelerator
>    Health Physics by Patterson and Thomas and in a more dedicated book on
>    activation, which is probably listed in Patterson & Thomas' references.
> 
>          The energies to make the fusion reactions go is typically 10 to
> 50
>    keV.  So, if you put in 10 to 50 keV and can get 15 MeV out (via the
>    neutrons), then you gain energy by making fusion reactions happen.
>    You have to contain the fusion plasma with magnetic fields or else the
>     plasma will interact with the fusion reactor (material) walls and
> destroy
> the
>     fusion reactor structure.
> 
>           The TFTR at PPPL was a tokomak of sorts, I believe.
> 
>          You can breed tritium by allowing the fusion neutrons to interact
> with a
>     blanket of Lithium, as alluded to by other persons posting to radsafe.
> 
>           The fusion reaction must achieve a sufficient temperature for
> the
>     reaction to go, and must have a density of D and T ions sufficient to
>     have a significant number of fusion reactions occur.  Also one wants
> to
>     keep the plasma "together" for a useful amount of time to get net
> energy
>     out.  If the D and T particles are indeed ions, then these ions repell
>     each other electromagnetically.
> 
>           Clearly  D,T fusion occurs all the time in neutron generators.
> But
>     the reaction is not occuring on a large (spatial) scale.
> 
>           Tokomaks work to confine plasmas because plasmas leaking from
>     one section of the tokomak leak only into other regions of the
> tokomak.
>     The fusion reaction is always contained by magnetic fields.
> 
>           On and On,  Blah, Blah, Blah.
> 
>          The deutrium for the fusions was supposed to come from ocean
> water.  As stated earlier, tritium can be bred in a fusion reactor.
> 
>           Franz, if you have more specific questions, just ask them and I
> will
>    try to answer.  If the question is beyond me, I will just say so.
> 
>           Regards,             Joseph R. (Joe) Preisig,  Ph.D.
> 
> 
> 
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