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Re:New design could finally help to bring fusion power close... by ZenoArrow on Monday August 10, 2015 @06:19PM (#10037819)
> "The challenge is the materials that compose the reactor become brittle and highly radioactive far faster than usable. Controlled fusion as an energy source isn't just challenging because fusion is difficult, it's also challenging because materials don't handle neutron bombardment well."

Isn't that problem solved with aneutronic fusion?

https://en.wikipedia.org/wiki/Aneutronic_fusion

Of course we should focus on getting fusion working (working in the sense of providing more energy than we put in), regardless of whether we use the aneutronic approach or not, but as the field develops I'm optimistic we'll find ways to have robust fusion reactors.

Re:New design could finally help to bring fusion power close... by iaw on Monday August 10, 2015 @06:48PM (#10037984)
I can honestly say I'd never heard of that before you posted your link. I don't know enough to form a valid opinion here.
Re:New design could finally help to bring fusion power close... by derwildemomo on Monday August 10, 2015 @07:22PM (#10038132)
"I don't know enough to form a valid opinion here.".

Beautiful. This is pretty much the last thing I ever expected to read on the interweb.

Re:New design could finally help to bring fusion power close... by ZenoArrow on Tuesday August 11, 2015 @09:10AM (#10040703)
Thank you for your honesty.

I'm not an expert in this field either, but I have been following the development of the Focus Fusion reactor being developed by Lawrenceville Plasma Physics, which is where I was introduced to the concept of aneutronic fusion. This video is a fairly decent introduction to their approach (note that the plan is to use the standard deuterium fuel first as it's cheaper and easier to work with, but the design can potentially support an aneutronic fuel such as pB11 in the future):

https://www.youtube.com/watch?v=O4w_dzSvVaM

Re:New design could finally help to bring fusion power close... by mapt on Monday August 10, 2015 @08:16PM (#10038354)
The problem is, low neutron fusion reaction cycles require a very high pressure/temperature/plasma density to reach peak reactivity, substantially higher than D+T and D+D fusion.

If we do eventually progress to aneutronic fusion test reactors, we will first have to get neutron-emitting fusion reactions working to the level of substantial net power generation, even if a given test reactor only lasts a few months before neutron irradiation becomes unmanageable.

Re:New design could finally help to bring fusion power close... by aqme28 on Monday August 10, 2015 @08:01PM (#10038305)
There are also reactions with fewer overall neutrons such as D-D fusion, which one of my professors was a large proponent of.