How do we prevent the fusion reactor chamber from melting?

[woonjy2013]

this question might be a bit stupid, but if the plasma in the fusion reactor has very high temperature, then how do we make the chamber not melt? i mean, not to join? contact? each other(chamber wall and plasma).
do we use magnetic field to make the distance? then how do we do that?

 

[rootone]

Yes, containment of the plasma by very strong magnetic fields is the usual approach, (tokamak reactor).
The most advanced tokamak project currently in progress is ITER.
https://en.wikipedia.org/wiki/ITER
There is at least one other approach which is not entirely reliant on magnetic confinement, although that is still a part of the story.
https://en.wikipedia.org/wiki/Wendelstein_7-X

 

[the_wolfman]

There is at least one other approach which is not entirely reliant on magnetic confinement, although that is still a part of the story.
https://en.wikipedia.org/wiki/Wendelstein_7-X

This statement is very misleading. It is true that there are alternatives to magnetic confinement.
However, stellarators like Wendelstein rely entirely of magnetic confinement.

 

[woonjy2013]

thanks!

 

[rootone]

OK thanks for that correction, I had thought that the stellarator project used a combination of containment methods, with magnetism being one, but didn't have time to recheck on that.

 

[mfb]

Both tokamak and stellarator use magnetic fields only. Just the origin of the field is different: Tokamaks need a magnetic field component that has to come from a plasma current (together with the stronger fields from coils), stellarators work with magnetic fields from coils only.