Length of time to burn fuel in a fusion reactor

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Homework Help Overview

The discussion revolves around calculating the duration for burning fuel in a fusion reactor, specifically using a mixture of deuterium and tritium as fuel. The original poster is uncertain about the approach to take for determining the time based on the reactor's power output and fuel composition.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need to understand the fusion yield and the mass of the fusing particles. The original poster questions whether the time to burn fuel is dependent on the amount of fuel available, suggesting that more fuel would lead to a longer burn time at a constant power output.

Discussion Status

The discussion is ongoing, with some participants providing guidance on how to approach the problem. There is an acknowledgment that the question resembles a homework problem, although the original poster indicates it is not for a formal assignment.

Contextual Notes

The original poster mentions that they are not a physics major and are seeking to learn more about fusion and plasma. They express uncertainty about the appropriateness of the forum section for their question.

clarinethero
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If I have a fusion reactor running at some designated power output (let's say, for instance, 5x10^8 Watts), how can I find how long it takes to burn a fuel source provided I know the composition of the fuel. For this example, let me just say I have half deuterium and half tritium?

I'm not really sure how to approach this. Any assistance would be appreciated.
 
Last edited:
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You can check the fusion yield per fusion process (via the particle masses, or just look it up), and you can check the mass of the fusing particles.

Is this homework? Then it should go to the homework section, and written according to the homework template.
 
I understand I can find the energy output from the fusion of deuterium and tritium by finding the mass deficit. This got me 2.818x10^-12 J for the reaction, but the numerical details are not important. I was going to do what you mentioned, so I'm good to go I think.

My only remaining question is: The amount of time it would take is dependent on how much fuel I have, correct? Worded differently, my answer is going to be a function of mass of fuel? I'd imagine that the more fuel I have the longer it would take to burn to completion given a constant power output.

I wasn't sure where to post this, but it's not homework. It's the summer and school's out for me (I'm also not a physics major, hence me asking this), but I'm trying to learn more about more about fusion and plasma. So, to do so I found a question that, in it, had my original question and was unsure how to approach it. Maybe it would have been better to post in the homework help section anyway. I also made up the numbers.
 
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It definitely qualifies as a homework like question.
 
Noted
 

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