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which makes me think practical fusion is impossible. I just can't see how they can make is self sustainable and controllable at the same time.
What exactly do you mean by that?
Modern man calls walking more quickly in the same direction down the same road “change.”
The world, in the last three hundred years, has not changed except in that sense.
The simple suggestion of a true change scandalizes and terrifies modern man. -Nicolás Gómez Dávila
Currently we have to infuse massive amounts of energy to create fusion. The only example of self sustaining fusion that I see in the universe (keep in mind I'm no expert ) is the sun/stars. Short of creating a star, I can't see how we can do it on a small scale and be able to control the energy output and/or shut the damn thing down in case things go wrong and it consumes the earth Only kidding on the last part, as fusion can't consume the heavy elements I believe. So I assume you could shut the thing down by removing the fuel. Perhaps we can find a way to control the energy output by controlling the fuel, but how do we create a self sustaining reaction?
Originally posted by Dis
Currently we have to infuse massive amounts of energy to create fusion. The only example of self sustaining fusion that I see in the universe (keep in mind I'm no expert ) is the sun/stars. Short of creating a star, I can't see how we can do it on a small scale and be able to control the energy output and/or shut the damn thing down in case things go wrong and it consumes the earth Only kidding on the last part, as fusion can't consume the heavy elements I believe. So I assume you could shut the thing down by removing the fuel. Perhaps we can find a way to control the energy output by controlling the fuel, but how do we create a self sustaining reaction?
You are right about the first part. Like a prominent French physicist said: "We want to put the sun in a box. Its a beautiful idea. But we don't know how to make the box."
Anyway the Sun sustains fusion because of the high density and the high temperature. The strong gravity of the sun contains the reaction, enabling it to happen.
One approach to fusion is similar, it just uses electromagnetism instead of gravity. Since we can't make electromagnetic fields strong enough to achieve the density present in the stellar mass we try to make up by having insanely higher temperatures than those found on the Sun so in addition to everything we have to heat the stuff up when we first start the reactor.
The thing becomes self-sustaining when the reaction produces enough energy to heat itself and gives and porvides enough power for us to keep the containment fields working.
PS You don't remove the fuel. Since its easier to maintain the EM field if there lass mass inside it, there is only enough "fuel" inside for a few minutes. During normal operation more "fuel" is constantly added. If you want' to stop the reactor you just stop giving it "gas".
Modern man calls walking more quickly in the same direction down the same road “change.”
The world, in the last three hundred years, has not changed except in that sense.
The simple suggestion of a true change scandalizes and terrifies modern man. -Nicolás Gómez Dávila
Tokamaks have fundamental design problems which might be impossible to solve.
The same can be said of inertial confinement fusion. Anyway, to what problems are you specificaly reffering to?
Modern man calls walking more quickly in the same direction down the same road “change.”
The world, in the last three hundred years, has not changed except in that sense.
The simple suggestion of a true change scandalizes and terrifies modern man. -Nicolás Gómez Dávila
) is the sun/stars. Short of creating a star, I can't see how we can do it on a small scale and be able to control the energy output and/or shut the damn thing down in case things go wrong and it consumes the earth 
Only kidding on the last part, as fusion can't consume the heavy elements I believe. So I assume you could shut the thing down by removing the fuel. Perhaps we can find a way to control the energy output by controlling the fuel, but how do we create a self sustaining reaction?
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