Designing a Fusion Reactor: Calculating Plasma Currents

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Discussion Overview

The discussion revolves around the design of a thermonuclear fusion reactor, specifically focusing on calculating the required plasma current for initiating the fusion process using a Deuterium-Tritium gas mixture. The scope includes theoretical calculations and considerations related to plasma physics and reactor design.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses a desire to design a fusion reactor and seeks guidance on calculating the necessary plasma current.
  • Another participant questions the feasibility of the project, suggesting that the endeavor is overly optimistic and compares it to designing a jet aircraft.
  • A participant emphasizes the importance of theoretical approaches and clarifies that they do not possess tritium gas.
  • Questions are raised regarding the original poster's technical background and familiarity with relevant literature on plasma physics and fusion reactor designs.
  • A later reply discusses the role of stability boundaries in reactor design, mentioning the Greenwald and Troyon limits, and suggests starting with safety factors for plasma stability.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of the project, with some questioning the practicality of designing a fusion reactor while others provide technical insights into plasma current calculations. No consensus is reached on the overall viability of the project.

Contextual Notes

Participants reference various technical concepts and limits related to plasma stability, indicating a reliance on specific theoretical frameworks without resolving the underlying complexities or assumptions involved in the calculations.

Dr. Octavious
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Hello all,

This might sound very optimistic for a project but I want to design a thermonuclear fusion reactor. Does anyone know how I can calculate the required plasma current I need in order to start a thermonuclear fusion process? I am using a mixture of Deuterium-Tritium gas.

Thanks!
 
Physics news on Phys.org
http://fusionforenergy.europa.eu/understandingfusion/technology.aspx

The above may help.
 
Dr. Octavious said:
I am using a mixture of Deuterium-Tritium gas.

Frankly, I don't believe you have any tritium gas. If you do, you need to contact the authorities immediately about proper disposal.

Next, "optimistic" is not the word for it. If you said instead "I want to design a jet aircraft. Does anyone know how I can calculate how much fuel I need?" would you expect people to think you had a chance? This is even harder.
 
Vanadium 50 said:
Frankly, I don't believe you have any tritium gas. If you do, you need to contact the authorities immediately about proper disposal.

Next, "optimistic" is not the word for it. If you said instead "I want to design a jet aircraft. Does anyone know how I can calculate how much fuel I need?" would you expect people to think you had a chance? This is even harder.
You are right, i do not have tritium gas. This is a theoretical approach (meaning calculations) not so much practical.
 
What is your technical background? What textbooks on Plasma Physics and Fusion have you been reading so far? Have you studied Chen?

What do you know about the various fusion reactor designs? Have you read about MFTFB? :smile: Or more modern reactor designs?
 
@berkeman I have basic nuclear physics knowledge, and for the past year I've read a lot of information regarding aspects of nuclear fusion (Coulomb's barrier,quantum tunneling, Lawson's criterion-triple product etc.). I am basically interested in a TOKAMAK reactor :) I've calculated many variables regarding the plasma and its parameters plus the confinement (toroidal field) I just can't find how to calculate the plasma current.
 
Dr. Octavious said:
Hello all,

This might sound very optimistic for a project but I want to design a thermonuclear fusion reactor. Does anyone know how I can calculate the required plasma current I need in order to start a thermonuclear fusion process? I am using a mixture of Deuterium-Tritium gas.

Thanks!

In reactor design studies the plasma current is typically set by a number of stability boundaries. Increasing the current increases the maximum stable pressure via the Greenwald limit. It also increases the maximum stable pressure via the Troyon limit. A simple place to start is to pick the safety factor on axis and at the edge. At the very least you want q on axis above 1 to avoid sawteeth, and q at the edge to be above 5 or so.
 
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the_wolfman said:
In reactor design studies the plasma current is typically set by a number of stability boundaries. Increasing the current increases the maximum stable pressure via the Greenwald limit. It also increases the maximum stable pressure via the Troyon limit. A simple place to start is to pick the safety factor on axis and at the edge. At the very least you want q on axis above 1 to avoid sawteeth, and q at the edge to be above 5 or so.
Great, thank you very much!
 

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